Page 1 RoofVent ® Design Handbook Supply and Extract Air Handling Units for Heating and Cooling High Spaces...
Page 3 Safety RoofVent ® Supply and extract air handling unit with energy recovery for heating high spaces RoofVent ® Supply and extract air handling unit with energy recovery for heating and cooling high spaces RoofVent twin heat ® Supply and extract air handling unit with high-capacity energy recovery for heating high spaces RoofVent twin cool...
Page 5 Safety Content Safety 1 Symbols _____________________________________ 5 2 Operational Safety ____________________________ 5 3 Information for a User Manual ___________________ 5...
Page 7: Operational Safety
Safety Symbols 1 Symbols 3 Information for a User Manual According to the accident prevention regulations of some Caution countries, the operator of equipment must meet certain This symbol warns against risks of injury. Please heed requirements for the prevention of occupational accidents all instructions designated by this symbol to prevent and instruct the operating personnel as to the hazards that injuries and/or death.
Page 9: Table Of Contents
RoofVent ® Content RoofVent ® Supply and extract air handling unit with energy recovery for heating high spaces 1 Use ________________________________________ 8 2 Construction and operation______________________ 8 3 Technical data _______________________________ 15 4 Design example ______________________________ 24 5 Options ____________________________________ 26 6 Control systems______________________________ 27 7 Transport and installation ______________________ 28 8 Specification texts ____________________________ 32...
Page 10: Use
RoofVent ® 1 Use 2 Construction and operation 1.1 Intended use The RoofVent LHW provides fresh air supply and extract air ® removal as well as heating for large spaces (production halls, RoofVent LHW units are used to supply fresh air, for shopping centres, sports halls, exhibition halls etc.).
Page 11: Construction And Operation
RoofVent ® Construction and operation 2.2 Air distribution with the Air-Injector The patented air distributor – called the Air-Injector – is the core element. The air discharge angle is set by means of the adjustable guide vanes. It depends on the air flow rate, the mounting height and the temperature difference between the supply air and room air.
Page 12 RoofVent ®...
Page 13 RoofVent ® Construction and operation Actuator Air-Injector: adjusts the supply air discharge direction continuously from vertical to horizontal Frost controller: prevents the coil freezing Extract air grille Extract air filter: bag filter with differential pressure switch for filter monitoring ER damper and bypass damper: opposed dampers for regulation of energy recovery, with actuator Access panel: access to extract air filter...
Page 14 RoofVent ® Construction and operation Fresh air inlet through weather louvre door Extract air inlet through extract air grille Filter with differential pressure switch Extract air sensor Fresh air damper with actuator Filter with differential pressure switch Plate heat exchanger Recirculation damper (opposed to the fresh air damper) Supply air fan ER/bypass damper with actuator...
Page 15 RoofVent ® Construction and operation 2.3 Operating modes The RoofVent LHW has the following operating modes: ® ■ ■ Exhaust air ■ Ventilation ■ Supply air ■ Ventilation (reduced) ■ Night cooling summer ■ Recirculation ■ Emergency operation ■ Recirculation night The DigiNet control system controls these operating modes automatically per control zone, in accordance with the scheduler (exception: emergency operation).
Page 16 RoofVent ® Construction and operation Code Operating mode Diagram Description Exhaust air For special cases Supply air fan ....Off The RoofVent unit extracts spent Exhaust air fan ....On ® room air. There is no room temperature Energy recovery ....0 % Fresh air damper ....
Page 17: Technical Data
Unit type RoofVent ® Unit size 6, 9 or 10 Control Design for DigiNet 5 Design for non-Hoval control Roof unit Roof unit with energy recovery Filter box Filter box, short Filter box, medium Filter box, long Heating section and coil type...
Page 18 RoofVent ® Technical data 3.3 Air flow rate, electrical connections Unit type LHW-6 LHW-9 LHW-10 Air distribution Nominal air flow rate Supply air m³/h 5500 8000 8800 Exhaust air m³/h 5500 8000 8800 Floor area reached Max. m² Energy recovery Heat recovery efficiency, dry Heat recovery efficiency, wet Fan characteristics...
Page 19 RoofVent ® Technical data 3.4 Sound levels Unit type LHW-6 LHW-9 LHW-10 Operating mode Position Sound pressure level (at a distance of 5 m) dB (A) 46 Total sound power level dB (A) 68 Octave sound power level 63 Hz dB (A) 51 125 Hz dB (A) 55 250 Hz dB (A) 61 500 Hz dB (A) 61...
Page 20 RoofVent ® Technical data 3.5 Heat output Note The performance data listed here applies to the most frequent design conditions. Use the selection program 'HK-Select' to calculate the performance data for other design data. You can download 'HK-Select' free of charge on the Internet. Fresh air temperature -5 °C -15 °C...
Page 21 RoofVent ® Technical data 3.6 Minimum and maximum distances Unit type LHW-6 LHW-9 LHW-10 Align the RoofVent units so that no unit draws in the ® exhaust air from another unit as fresh air. Unit clearance X Min. 11.0 13.0 14.0 The extract air grille must be easily accessible.
Page 22 RoofVent ® Technical data 3.7 Dimensions and weight Roof unit LW Cable feedthroughs for electrical connections Filter box short F00 / medium F25 / long F50 Access panel Heating section H Return Air-Injector D Flow Fig. B4: Dimensional drawing for RoofVent LHW (dimensions in mm) ®...
Page 23 RoofVent ® Technical data Unit type LHW-6 LHW-9 LHW-10 Dimensions of 2100 2400 2400 roof unit 1080 1380 1380 1390 1500 1500 1092 1392 1392 Filter box design Dimensions of below-roof unit 940 1190 1440 980 1230 1480 980 1230 1480 1700 1950 2200 1850 2100 2350 1850 2100 2350 780 1030 780 1030...
Page 24 RoofVent ® Technical data 3.8 Air flow rate with additional pressure drops Pressure increase in Pa Exhaust air Supply air Example: LHW-6 An additional pressure drop of 84 Pa results in a new air flow rate of 5100 m³/h. Air flow rate in m³/h Diagram B1: Air flow rate, RoofVent LHW-6 with additional pressure drops ®...
Page 25 RoofVent ® Technical data Pressure increase in Pa Exhaust air Supply air LHW-10 Air flow rate in m³/h Diagram B3: Air flow rate, RoofVent LHW-10 with additional pressure drops ®...
Page 26: Design Example
RoofVent ® Design example 4 Design example Design data Example ■ Required fresh air flow rate or air change rate Fresh air flow rate ........30'000 m³/h ■ Hall geometry (length, width, height) Hall geometry (L x W x H) ...... 52 x 45 x 9 m ■...
Page 27 RoofVent ® Design example Selection of coil type Select coil type B with 55 kW heat output to cover the fabric From Table B6, select the required coil type based on the heat losses at LPHW 80/60 °C and fresh air temperature output necessary to cover the fabric heat losses per unit.
Page 28: Options
RoofVent ® Options 5 Options RoofVent LHW units can be adapted to the requirements of the specific project with a series of options. ® You will find a detailed description of all optional components in Section K 'Options' of this handbook. Option ColdClimate design For installation of the RoofVent...
Page 29: Control Systems
Commissioning of the DigiNet is quick and easy thanks to the plug & play components and pre-addressed control modules. You can find a detailed description of the Hoval DigiNet in Part L 'Control systems' of this handbook. Non-Hoval system RoofVent LHWs can also be controlled with non-Hoval ®...
Page 30: Transport And Installation
Risk of injury as a result of incorrect handling. Have transport and assembly work carried out by trained The Hoval DigiNet control system is designed for a distributor specialists ! circuit with separate hydraulic connection of the units; i.e. a mixing valve is installed in front of each unit.
Page 31 RoofVent ® Transport and installation DigiUnit terminal box Room air sensor novaNet system bus Trouble input heating Power supply Main pump Connection box DigiMaster Magnetic mixing valve Zone control panel Collective trouble indicator Enable heating Fresh air sensor Heating control panel Fig.
Page 32 (inside) to the roof unit. ■ Wire the mixing valves to the connection box. (There is a plug connection for Hoval magnetic mixing valves.) ■ For injection system: Wire the pump to the DigiUnit terminal box.
Page 33 RoofVent ® Transport and installation Component Description Voltage Cable Option Comment DigiUnit Power supply 3 x 400 V LHW-6: 5 x 4 mm² terminal box LHW-9: 5 x 6 mm² LHW-10: 5 x 10 mm² novaNet system bus 2 x 0.16 mm² For bus cable specifications, see Section L, chap.
Page 34: Specification Texts
Maintenance-free, direct-drive exhaust air fan Type H.__-… ■ DigiUnit terminal box with DigiUnit controller as part of the Heat output … Hoval DigiNet control system. Heating medium LPHW … / … °C DigiUnit controller DU5 At air inlet temperature …...
Page 35 Hoval DigiNet control system Magnetic mixing valve ..HV...
Page 36 2-pin circuit breakers Package consisting of operating software, novaNet router ■ Power supply for indoor climate units with integrated and connection cables for using the Hoval DigiNet with a PC: DigiUnit controller ■ Monitoring and setting the DigiNet system (operating ■...
Page 37 RoofVent ® Content RoofVent ® Supply and extract air handling unit with energy recovery for heating and cooling high spaces 1 Use _______________________________________ 36 2 Construction and operation_____________________ 36 3 Technical data _______________________________ 43 4 Design example ______________________________ 52 5 Options ____________________________________ 54 6 Control systems______________________________ 55 7 Transport and installation ______________________ 56 8 Specification texts ____________________________ 60...
Page 38: Use
RoofVent ® 1 Use 2 Construction and operation 1.1 Intended use The RoofVent LKW is used for ventilating, heating and ® cooling large areas (production halls, shopping centres, RoofVent LKW units are used to supply fresh air and to sports halls, exhibition halls, etc.). It fulfils the following func- ®...
Page 39: Construction And Operation
RoofVent ® Construction and operation 2.2 Air distribution with the Air-Injector The patented air distributor – called the Air-Injector – is the core element. The adjustable vanes are used to set the air discharge angle. It depends on the air flow rate, the mounting height and the temperature difference between the supply air and room air.
Page 40 RoofVent ®...
Page 41 RoofVent ® Construction and operation Actuator Air-Injector: adjusts the supply air discharge direction continuously from vertical to horizontal Condensate connection Frost controller Extract air grille Extract air filter: bag filter with differential pressure switch for filter monitoring ER damper and bypass damper: opposed dampers for regulation of energy recovery, with actuator Access panel: access to extract air filter...
Page 42 RoofVent ® Construction and operation Fresh air inlet through weather louvre door Air-Injector with actuator Filter with differential pressure switch Extract air inlet through extract air grille Fresh air damper with actuator Extract air sensor Plate heat exchanger Filter with differential pressure switch Supply air fan Recirculation damper (opposed to the fresh air damper) Silencer and diffuser...
Page 43 RoofVent ® Construction and operation 2.3 Operating modes The RoofVent LKW has the following operating modes: ® ■ ■ Exhaust air ■ Ventilation ■ Supply air ■ Ventilation (reduced) ■ Night cooling summer ■ Recirculation ■ Emergency operation ■ Recirculation night The DigiNet control system controls these operating modes automatically per control zone, in accordance with the scheduler (exception: emergency operation).
Page 44 RoofVent ® Construction and operation Code Operating mode Diagram Description Exhaust air For special cases Supply air fan ....Off The RoofVent unit extracts spent Exhaust air fan ....On ® room air. There is no room temperature Energy recovery ....0 % Fresh air damper ....
Page 45: Technical Data
+ F00 - K.C - Unit type RoofVent ® Unit size 6, 9 or 10 Control Design for DigiNet 5 Design for non-Hoval control Roof unit Roof unit with energy recovery Filter box Filter box, short Filter box, medium Filter box, long Heating/cooling section...
Page 46 RoofVent ® Technical data 3.3 Air flow rate, electrical connections Unit type LKW-6 LKW-9 LKW-10 Air distribution Nominal air flow rate Supply air m³/h 5000 7650 8400 Exhaust air m³/h 5000 7650 8400 Floor area reached Max. m² Energy recovery Heat recovery efficiency, dry Heat recovery efficiency, wet Fan characteristics...
Page 47 RoofVent ® Technical data 3.5 Heat output Note The performance data listed here applies to the most frequent design conditions. Use the selection program 'HK-Select' to calculate the performance data for other design data. You can download 'HK-Select' free of charge on the Internet. Fresh air temperature -5 °C -15 °C...
Page 48 RoofVent ® Technical data 3.6 Cooling capacities Cooling medium temperature 6/12 °C 8/14 °C Size Type ∆p ∆p °C °C l/h kg/h °C l/h kg/h LKW-6 3065 2403 LKW-6 5084 4199 LKW-6 4761 3877 LKW-6 – – – – – –...
Page 49 RoofVent ® Technical data 3.7 Minimum and maximum distances Unit type LKW-6 LKW-9 LKW-10 Align the RoofVent units so that no unit draws in the ® exhaust air from another unit as fresh air. Unit clearance X Min. The extract air grille must be easily accessible. Max.
Page 50 RoofVent ® Technical data 3.8 Dimensions and weight Roof unit LW Air-Injector D Filter box short F00 / medium F25 / long F50 Return Cable feedthroughs Flow Access panel Condensate connection Heating/cooling section K Fig. C4: Dimensional drawing for RoofVent LKW (dimensions in mm) ®...
Page 51 RoofVent ® Technical data Unit type LKW-6 LKW-9 LKW-10 Dimensions of 2100 2400 2400 roof unit 1080 1380 1380 1390 1500 1500 1092 1392 1392 Filter box design Dimensions of below-roof unit 940 1190 1440 980 1230 1480 980 1230 1480 2050 2300 2550 2160 2410 2660 2160 2410 2660 780 1030 780 1030...
Page 52 RoofVent ® Technical data 3.9 Air flow rate with additional pressure drops Pressure increase in Pa Exhaust air Supply air Example: LKW-6 An additional pressure drop of 42 Pa results in a new air flow rate of 4800 m³/h. Air flow rate in m³/h Diagram C1: Air flow rate, RoofVent LKW-6 with additional pressure drops ®...
Page 53 RoofVent ® Technical data Pressure increase in Pa Exhaust air Supply air LKW-10 Air flow rate in m³/h Diagram C3: Air flow rate, RoofVent LKW-10 with additional pressure drops ®...
Page 54: Design Example
RoofVent ® Design example 4 Design example Note The following design example relates to cooling mode. The design rating for heating mode can be performed analogously to the design example above in Section B 'RoofVent LHW.' ® Design data Example ■...
Page 55 RoofVent ® Design example Checking the ancillary conditions ■ Maximum floor area reached Floor area per unit = 72 · 60 / 10 = 432 m² Calculate the floor area reached per unit using the Max. floor area reached = 855 m² selected number of units.
Page 56: Options
RoofVent ® Options 5 Options RoofVent LKW units can be adapted to the requirements of the specific project with a series of options. ® You will find a detailed description of all optional components in Section K 'Options' of this handbook. Option ColdClimate design For installation of the RoofVent...
Page 57: Control Systems
Commissioning of the DigiNet is quick and easy thanks to the plug & play components and pre-addressed control modules. You can find a detailed description of the Hoval DigiNet in Section L 'Control systems' of this handbook. Non-Hoval system RoofVent LKWs can also be controlled with non-Hoval ®...
Page 58: Transport And Installation
Risk of injury as a result of incorrect handling. Have transport and assembly work carried out by trained The Hoval DigiNet control system is designed for a distributor specialists ! circuit with separate hydraulic connection of the units; i.e. a mixing valve is installed in front of each unit.
Page 59 RoofVent ® Transport and installation DigiUnit terminal box Main pump novaNet system bus DigiMaster Power supply Zone control panel Connection box Selector switch heating/cooling Magnetic mixing valve Enable heating Collective trouble indicator Enable cooling Heating control panel Fresh air sensor Heating circuit Room air sensor Cooling circuit...
Page 60 (inside) to the roof unit. ■ Wire the mixing valves to the connection box. (There is a plug connection for Hoval magnetic mixing valves.) ■ For injection system: Wire the pump to the DigiUnit terminal box.
Page 61 RoofVent ® Transport and installation Component Description Voltage Cable Option Comment DigiUnit Power supply 3 x 400 V LKW-6: 5 x 4 mm² terminal box LKW-9: 5 x 6 mm² LKW-10: 5 x 10 mm² novaNet system bus 2 x 0.16 mm² For bus cable specifications, see Section L, chap.
Page 62: Specification Texts
■ Maintenance-free, direct-drive exhaust air fan line (included in delivery) ■ DigiUnit terminal box with DigiUnit controller as part of the Hoval DigiNet control system. Type K.__-9 Heat output … DigiUnit controller DU5...
Page 63 RoofVent ® Specification texts 8.4 Air-Injector D the respective heating/cooling coil and the Hoval DigiNet control system Internally-insulated Aluzinc sheet steel casing with: Magnetic mixing valve ..HV ■ Vortex air distributor with concentric outlet nozzle, adjust- able vanes and integrated absorber hood Continuous regulating valve with magnetic drive, ready for ■...
Page 64 DigiCom DC5 DigiUnit controller Package consisting of operating software, novaNet router ■ Integration of indoor climate units without integrated and connection cables for using the Hoval DigiNet with a PC: DigiUnit controller ■ Monitoring and setting the DigiNet system (operating ■...
Page 65: For Heating High Spaces
RoofVent twin heat ® Supply and extract air handling unit with high-capacity energy recovery for heating high spaces 1 Use _______________________________________ 64 2 Construction and operation_____________________ 64 3 Technical data _______________________________ 71 4 Design example ______________________________ 78 5 Options ____________________________________ 80 6 Control systems______________________________ 81 7 Transport and installation ______________________ 82 8 Specification texts ____________________________ 86...
Page 66: Use
RoofVent twin heat ® 1 Use 2 Construction and operation 1.1 Intended use The RoofVent twin heat provides fresh air supply and ® extract air removal as well as heating for large spaces RoofVent twin heat units are used to supply fresh air, for the (production halls, shopping centres, sports halls, exhibition ®...
Page 67 RoofVent twin heat ® Construction and operation 2.2 Air distribution with the Air-Injector The patented air distributor – called the Air-Injector – is the core element. The adjustable vanes are used to set the air discharge angle. It depends on the air flow rate, the mounting height and the temperature difference between the supply air and room air.
Page 68 RoofVent twin heat ®...
Page 69 RoofVent twin heat ® Construction and operation Actuator Air-Injector: adjusts the supply air discharge direction continuously from vertical to horizontal Heating coil: LPHW coil consisting of copper tubes with aluminium fins Access panel: Access to the heating coil Plate heat exchanger 2: with bypass for energy recovery control ER damper and bypass damper 2: opposed dampers for energy recovery regulation, with continuous actuator...
Page 70 RoofVent twin heat ® Construction and operation Fresh air inlet through weather louvre door Extract air inlet through extract air grille Filter with differential pressure switch Extract air sensor Fresh air damper with actuator ER/bypass damper 2 with actuator Plate heat exchanger 1 with differential pressure switch Filter with differential pressure switch Supply air fan Recirculation damper (opposed to the fresh air damper)
Page 71 RoofVent twin heat ® Construction and operation 2.3 Operating modes The RoofVent twin heat has the following operating modes: ® ■ ■ Exhaust air ■ Ventilation ■ Supply air ■ Recirculation ■ Night cooling summer ■ Recirculation night ■ Emergency operation The DigiNet control system controls these operating modes automatically per control zone, in accordance with the sched- uler (exception: emergency operation).
Page 72 RoofVent twin heat ® Construction and operation Code Operating mode Diagram Description Exhaust air for special cases Supply air fan ....Off The RoofVent unit extracts spent Exhaust air fan ....On ® room air. There is no room temperature Energy recovery ....
Page 73: Technical Data
Unit type RoofVent twin heat ® Unit size Control Design for DigiNet 5 Design for non-Hoval controls Roof unit Roof unit with energy recovery for RoofVent twin ® Combi box with energy recovery, extract air filter and type T heating coil...
Page 74 RoofVent twin heat ® Technical data 3.3 Air flow rate, electrical connections Unit type TWH-9 Air distribution Nominal air flow rate Supply air m³/h 7100 Exhaust air m³/h 7100 Floor area reached max. m² Energy recovery Heat recovery efficiency, dry Heat recovery efficiency, wet Fan characteristics Supply voltage...
Page 75 RoofVent twin heat ® Technical data 3.4 Sound levels Unit type TWH-9 Operating mode Position Sound pressure level (at a distance of 5 m) dB (A) Total sound power level dB (A) Octave sound power level 63 Hz dB (A) 125 Hz dB (A) 250 Hz...
Page 76 RoofVent twin heat ® Technical data 3.5 Heat output Note The performance data listed here applies to the most frequent design conditions. Use the selection program 'HK-Select' to calculate the performance data for other design data. You can download 'HK-Select' free of charge on the Internet. Fresh air temperature -5 °C -15 °C...
Page 77 RoofVent twin heat ® Technical data 3.6 Minimum and maximum distances Unit type TWH-9 Align the RoofVent units so that no unit draws in the ® exhaust air from another unit as fresh air. Unit clearance X min. 12.0 Provide a clear space of approx. 1.5 m on the side max.
Page 78 RoofVent twin heat ® Technical data 3.7 Dimensions and weight Roof unit LW.T Air-Injector D Combi box T Return Cable feedthroughs for electrical connections Flow Access panel Condensate drain connection Fig. D4: Dimensional drawing for RoofVent twin heat (dimensions in mm) ®...
Page 79 RoofVent twin heat ® Technical data Type Water content Connection " Pipe thr. 1 ½ (female) Table D8: Heating coil data Unit type TWH-9 Roof unit Below-roof unit Combi box (incl. coil) Air-Injector Total Table D9: Weight of the RoofVent twin heat ®...
Page 80: Design Example
RoofVent twin heat ® Design example 4 Design example Design data Example ■ Required fresh air flow rate or air change rate Fresh air flow rate ........25'000 m³/h ■ Hall geometry (length, width, height) Hall geometry (L x W x H) ....50 x 44 x 10 m ■...
Page 81 RoofVent twin heat ® Design example Checking the ancillary conditions ■ Maximum mounting height Actual mounting height = 8.5 m The actual mounting height (= distance between the floor Max. mounting height H = 9.5 m → OK and the bottom edge of the unit) must not exceed the maximum mounting height H (see Table D6).
Page 82: Options
RoofVent twin heat ® Options 5 Options RoofVent twin heat units can be adapted to the requirements of the specific project with a series of ® options. You will find a detailed description of all optional components in Section K 'Options' of this handbook.
Page 83: Control Systems
Commissioning of the DigiNet is quick and easy thanks to the plug & play components and pre-addressed control modules. You can find a detailed description of the Hoval DigiNet in Part L 'Control systems' of this manual. Non-Hoval system RoofVent twin heat units can also be controlled via non- ®...
Page 84: Transport And Installation
! Caution Risk of injury from incorrect handling. Transport The Hoval DigiNet control system is designed for a distributor and assembly work to be carried out only by trained circuit with separate hydraulic connection of the units; i.e. a specialists! mixing valve is installed in front of each unit.
Page 85 RoofVent twin heat ® Transport and installation DigiUnit terminal box Room air sensor novaNet system bus Trouble input heating Power supply Main pump Connection box DigiMaster Magnetic mixing valve Zone control panel Collective trouble indicator Enable heating Fresh air sensor Heating control panel Fig.
Page 86 Wire the actuator of the ER/bypass damper 2 to the DigiUnit terminal box. ■ Wire the mixing valves to the connection box. (There is a plug connection for Hoval magnetic mixing valves.) ■ For injection system: Wire pump to the DigiUnit terminal box.
Page 87 RoofVent twin heat ® Transport and installation Component Description Voltage Cable Option Comment DigiUnit Power supply 3 x 400 V 5 x 6 mm² terminal box novaNet system bus 2 x 0.16 mm² For bus cable specifications, see Part L, Chap. 2.4 Heating pump 3 x 400 V 4 x 2.5 mm²...
Page 88: Specification Texts
°C frequency converter ■ DigiUnit terminal box with DigiUnit controller as part of the Hoval DigiNet control system 8.3 Air-Injector D DigiUnit controller DU5 Control module, fully wired to the components of the venti- Casing made from Aluzinc sheet steel with: lation unit (fans, actuators, temperature sensors, frost ■...
Page 89 DigiUnit terminal box mixing valve for connection to the connection box; sized for the respective heating coil and the Hoval DigiNet control system Magnetic mixing valve ..HV...
Page 90 ■ Power supply for indoor climate units with integrated Package consisting of operating software, novaNet router DigiUnit controller and connection cables for using the Hoval DigiNet with a PC: ■ Integration of indoor climate units without integrated ■ Monitoring and setting the DigiNet system (operating...
Page 91: Supply And Extract Air Handling Unit With High-Capacity Energy Recovery For Heating And Cooling High Spaces
RoofVent twin cool ® Contents RoofVent twin cool ® Supply and extract air handling unit with high-capacity energy recovery for heating and cooling high spaces 1 Use _______________________________________ 90 2 Construction and operation_____________________ 90 3 Technical data _______________________________ 97 4 Design example _____________________________ 106 5 Options ___________________________________ 108 6 Control systems_____________________________ 109 7 Transport and installation _____________________ 110...
Page 92: Use
RoofVent twin cool ® 1 Use 2 Construction and operation 1.1 Intended use The RoofVent twin cool provides fresh air supply and extract ® air removal as well as heating and cooling for large spaces RoofVent twin cool units are used to supply fresh air, (production halls, shopping centres, sports halls, exhibition ®...
Page 93: Construction And Operation
RoofVent twin cool ® Construction and operation 2.2 Air distribution with the Air-Injector The patented air distributor – called the Air-Injector – is the core element. The adjustable vanes are used to set the air discharge angle. It depends on the air flow rate, the mounting height and the temperature difference between the supply air and room air.
Page 94 RoofVent twin cool ®...
Page 95 RoofVent twin cool ® Construction and operation Actuator Air-Injector: adjusts the supply air discharge direction continuously from vertical to hori- zontal Heating/cooling coil: LPHW/LPCW coil consisting of copper tubes with aluminium fins Access panel: Access to the heating/cooling coil Plate heat exchanger 2: with bypass for energy recovery control ER damper and bypass damper 2: opposed dampers for regulation of energy recovery, with continuous actuator...
Page 96 RoofVent twin cool ® Construction and operation Fresh air inlet through weather louvre door Air-Injector with actuator Filter with differential pressure switch Extract air inlet through extract air grille Fresh air damper with actuator Extract air sensor Plate heat exchanger 1 with differential pressure switch ER/bypass damper 2 with actuator Supply air fan Filter with differential pressure switch...
Page 97 RoofVent twin cool ® Construction and operation 2.3 Operating modes The RoofVent twin cool has the following operating modes: ® ■ ■ Recirculation night ■ Night cooling summer ■ Ventilation ■ Exhaust air ■ Emergency operation ■ Recirculation ■ Supply air The DigiNet control system controls these operating modes automatically per control zone, in accordance with the scheduler (exception: emergency operation).
Page 98 RoofVent twin cool ® Construction and operation Code Operating mode Diagram Description Exhaust air for special cases Supply air fan ....Off The RoofVent unit extracts spent Exhaust air fan ....On ® room air. There is no room temperature Energy recovery ....
Page 99: Technical Data
Unit type RoofVent twin cool ® Unit size Control Design for DigiNet 5 Design for non-Hoval controls Roof unit Roof unit with energy recovery for RoofVent twin ® Combi box with energy recovery and extract air filter (without coil) with energy recovery, extract air filter and coil type T (for 4-pipe system)
Page 100 RoofVent twin cool ® Technical data 3.3 Air flow rate, electrical connections Unit type TWC-9 Air distribution Nominal air flow rate Supply air m³/h 7000 Exhaust air m³/h 7000 Floor area reached max. m² Energy recovery Heat recovery efficiency, dry Heat recovery efficiency, wet Fan characteristics Supply voltage...
Page 101 RoofVent twin cool ® Technical data 3.4 Sound levels Unit type TWC-9 Operating mode Position Sound pressure level (at a distance of 5 m) dB (A) Total sound power level dB (A) Octave sound power level 63 Hz dB (A) 125 Hz dB (A) 250 Hz...
Page 102 RoofVent twin cool ® Technical data 3.5 Heat output Note The performance data listed here applies to the most frequent design conditions. Use the selection program 'HK-Select' to calculate the performance data for other design data. You can download 'HK-Select' free of charge on the Internet. Fresh air temperature -5 °C -15 °C...
Page 103 RoofVent twin cool ® Technical data 3.6 Cooling capacities Cooling medium temp. 6/12 °C 8/14 °C Size Type ∆p ∆p °C °C l/h kg/h °C l/h kg/h TWC-9 9 4194 6 3231 TWC-9 12 5519 6 3946 TWC-9 25 7233 18 5959 TWC-9 30 9291...
Page 104 RoofVent twin cool ® Technical data 3.7 Minimum and maximum distances Unit type TWC-9 Align the RoofVent units so that no unit draws in the ® exhaust air from another unit as fresh air. Unit clearance X min. 12.0 Provide a clear space of approx. 1.5 m on the side max.
Page 105 RoofVent twin cool ® Technical data 3.8 Dimensions and weight Roof unit LW.T Access panel Return Combi box T Heating/cooling section K Flow Cable feedthroughs Air-Injector D Condensate drain connection Fig. E4: Dimensional drawing for RoofVent twin cool (dimensions in mm) ®...
Page 106 RoofVent twin cool ® Technical data Type Water content 11.7 18.0 Connection " Pipe thr. 1½ Pipe thr. 2 (female) (female) Table E9: Heating/cooling coil data TWC-9 with coil type Roof unit Below-roof unit Combi box Heating/cooling section Air-Injector Total Table E10: Weight of the RoofVent twin cool ®...
Page 107 RoofVent twin cool ® Technical data 3.9 Air flow rate with additional pressure drops Pressure increase in Pa Example: An additional pressure drop of 48 Pa results in a TWC-9 new air flow rate of 6620 m³/h. 5500 6000 6500 7000 7500 Air flow rate in m³/h...
Page 108: Design Example
RoofVent twin cool ® Design example 4 Design example Note The following design example relates to cooling mode. The design rating for heating mode can be performed analogously to the design example above in Section B 'RoofVent LHW'. ® Design data Example ■...
Page 109 RoofVent twin cool ® Design example Checking the ancillary conditions ■ Maximum floor area reached Floor area per unit = 72 · 50 / 10 = 360 m² Calculate the floor area reached per unit using the Max. floor area reached = 661 m²...
Page 110: Options
RoofVent twin cool ® Options 5 Options RoofVent twin cool units can be adapted to the requirements of the specific project with a series of ® options. You will find a detailed description of all optional components in Section K 'Options' of this handbook.
Page 111: Control Systems
Commissioning of the DigiNet is quick and easy thanks to the plug & play components and pre-addressed control modules. You can find a detailed description of the Hoval DigiNet in Section L 'Control systems' of this handbook. Non-Hoval system RoofVent twin cool units can also be controlled via non- ®...
Page 112: Transport And Installation
! Caution Risk of injury from incorrect handling. Transport The Hoval DigiNet control system is designed for a distributor and assembly work to be carried out only by trained circuit with separate hydraulic connection of the units; i.e. a specialists! mixing valve is installed in front of each unit.
Page 113 RoofVent twin cool ® Transport and installation DigiUnit terminal box Main pump novaNet system bus DigiMaster Power supply Zone control panel Connection box Option switch heating/cooling Magnetic mixing valve Enable heating Collective trouble indicator Enable cooling Heating control panel Fresh air sensor Heating circuit Room air sensor Cooling circuit...
Page 114 Wire the actuator of the ER/bypass damper 2 to the DigiUnit terminal box. ■ Wire the mixing valves to the connection box. (There is a plug connection for Hoval magnetic mixing valves.) ■ For injection system: Wire pump to the DigiUnit terminal box.
Page 115 RoofVent twin cool ® Transport and installation Component Description Voltage Cable Option Comment DigiUnit Power supply 3 x 400 V 5 x 6 mm² terminal box novaNet system bus 2 x 0.16 mm² For bus cable specifications, see Section L, chap. 2.4 Heating/cooling pump 3 x 400 V 4 x 2.5 mm²...
Page 116: Specification Texts
Maintenance-free, direct-drive exhaust air fan with the frost controller; trap for connection to a condensate line frequency converter (included in delivery) ■ DigiUnit terminal box with DigiUnit controller as part of the Hoval DigiNet control system Type K.__-9 Heat output … DigiUnit controller DU5...
Page 117 Heating and cooling in the 4-pipe system mixing valve for connection to the connection box; sized for the respective heating/cooling coil and the Hoval DigiNet additional heating coil of type T installed in the combi box control system Type T.T-9...
Page 118 2-pin circuit breakers Package consisting of operating software, novaNet router ■ Power supply for indoor climate units with integrated and connection cables for using the Hoval DigiNet with a PC: DigiUnit controller ■ Monitoring and setting the DigiNet system (operating ■...
Page 119: Supply And Extract Air Handling Unit With Reversible Heat Pump For Heating And Cooling High Spaces
RoofVent twin pump ® Content RoofVent twin pump ® Supply and extract air handling unit with reversible heat pump for heating and cooling high spaces 1 Use ______________________________________ 118 2 Construction and operation____________________ 118 3 Technical data ______________________________ 125 4 Design example _____________________________ 136 5 Options ___________________________________ 138 6 Control systems_____________________________ 139 7 Transport and installation _____________________ 140...
Page 120: Use
RoofVent twin pump ® 1 Use 2 Construction and operation 1.1 Intended use The RoofVent twin pump provides fresh air supply and ® extract air removal as well as heating and cooling for large RoofVent twin pump units are used to supply fresh air, spaces (production halls, shopping centres, sports halls, ®...
Page 121: Construction And Operation
RoofVent twin pump ® Construction and operation 2.2 Air distribution with the Air-Injector The patented air distributor – called the Air-Injector – is the core element. The adjustable vanes are used to set the air discharge angle. It depends on the air flow rate, the mounting height and the temperature difference between the supply air and room air.
Page 122 RoofVent twin pump ®...
Page 123 RoofVent twin pump ® Construction and operation Actuator Air-Injector: Adjusts the supply air discharge direction continuously from vertical to horizontal Heating/cooling coil: evaporator coil/condenser, made from copper tubes with aluminium fins Access panel: access to the heating/cooling coil Plate heat exchanger 2: with bypass for energy recovery control ER damper and bypass damper 2: opposed dampers for regulation of energy recovery, with continuous actuator...
Page 124 RoofVent twin pump ® Construction and operation Fresh air inlet through weather louvre door Air-Injector with actuator Filter with differential pressure switch Extract air inlet through extract air grille Fresh air damper with actuator Extract air sensor Plate heat exchanger 1 with differential pressure switch ER/bypass damper 2 with actuator Supply air fan Filter with differential pressure switch...
Page 125 RoofVent twin pump ® Construction and operation 2.3 Operating modes The RoofVent twin pump has the following operating modes: ® ■ ■ Recirculation night ■ Night cooling summer ■ Ventilation ■ Exhaust air ■ Emergency operation ■ Recirculation ■ Supply air The DigiNet control system regulates these operating modes automatically for each control zone according to the scheduler.
Page 126 RoofVent twin pump ® Construction and operation Code Operating mode Diagram Description Recirculation For pre-heating and Supply air fan ....On On/Off operation: When heating or pre-cooling Exhaust air fan ....Off cooling is required, the RoofVent unit Energy recovery ....0 % ®...
Page 127: Technical Data
RoofVent twin pump ® Technical data 3 Technical data 3.1 Unit type reference Below-roof unit TWP - 9 / / LW.P + T.P - K.W - Unit type RoofVent twin pump ® Unit size Control Design for DigiNet 5 Roof unit Roof unit with energy recovery and control attachment for RoofVent twin pump...
Page 128 RoofVent twin pump ® Technical data 3.2 Application limits Extract air temperature max. 50 °C Extract air relative humidity max. 60 % Moisture content of extract air max. 9.5 g/kg Fresh air temperature Heating -20…+15 °C Cooling -5…+43 °C Supply air temperature max.
Page 129 RoofVent twin pump ® Technical data 3.3 Air flow rate, electrical connections Unit type TWP-9 Air distribution Nominal air flow rate Supply air m³/h 7000 Exhaust air m³/h 7000 Floor area reached Max. m² Energy recovery Heat recovery efficiency, dry Heat recovery efficiency, wet Fan characteristics Supply voltage...
Page 130 RoofVent twin pump ® Technical data 3.4 Technical data for the heat pump Unit type ERQ250 Nominal heat output 31.5 Nominal cooling capacity 28.0 Control range 0…100 Working medium – R410a Working medium filling quantity (pre-filled) Evaporation temperature °C Sound pressure level (at a distance of 5 m) dB (A) Sound power level dB (A)
Page 131 RoofVent twin pump ® Technical data 3.5 Sound levels Unit type TWP-9 Operating mode Position Sound pressure level (at a distance of 5 m) dB (A) Total sound power level dB (A) Octave sound power level 63 Hz dB (A) 125 Hz dB (A) 250 Hz...
Page 132 RoofVent twin pump ® Technical data 3.6 Heat output Note The performance data listed here applies to the most frequent design conditions. Use the selection program 'HK-Select' to calculate the perfor- mance data for other design data. You can download 'HK-Select' free of charge on the Internet.
Page 133 RoofVent twin pump ® Technical data 3.7 Cooling capacities °C °C kg/h Legend: Temperature of the fresh air Relative humidity of the fresh air Sensible cooling capacity Total cooling capacity Output for coverage of fabric cooling losses (→ sensible cooling load) Supply air temperature Amount of condensate Refers to:...
Page 134 RoofVent twin pump ® Technical data 3.8 Minimum and maximum distances Unit type TWP-9 In each case, install the heat pump next to the RoofVent unit. ® Unit clearance X Min. 12.0 Align the RoofVent units so that no unit draws in the ®...
Page 135 RoofVent twin pump ® Technical data 3.9 Dimensions and weight Roof unit LW.P Cable feedthroughs Condensate connection Communication box Access panel Gas line connection 28 mm Liquid line 9.5 mm Heating/cooling section K.W Liquid line connection 22 mm Gas pipe 22.2 mm Air-Injector D Cable feedthrough...
Page 136 RoofVent twin pump ® Technical data Unit type TWP-9 Roof unit Below-roof unit Combi box Heating/cooling section Air-Injector Total Table F10: Weights, RoofVent twin pump ® Heat pump Daikin ERQ250 Weight: 240 kg Terminal box Connection for working medium circuit (front or bottom) Cable feedthroughs Table F11: Dimensions and weights of the heat pump...
Page 137 RoofVent twin pump ® Technical data 3.10 Air flow rate with additional pressure drops Pressure increase in Pa Example: An additional pressure drop of 48 Pa results in a TWP-9 new air flow rate of 6620 m³/h. 5500 6000 6500 7000 7500 Air flow rate in m³/h...
Page 138: Design Example
RoofVent twin pump ® Design example 4 Design example Note The following design example relates to cooling mode. The design rating for heating mode can be performed analogously to the design example above in Section B 'RoofVent LHW.' ® Design data Example ■...
Page 139 RoofVent twin pump ® Design example Checking the ancillary conditions ■ Maximum floor area reached Floor area per unit = 50 · 18 / 3 = 300 m² Calculate the floor area reached per unit using the Max. floor area reached = 661 m²...
Page 140: Options
RoofVent twin pump ® Options 5 Options RoofVent twin pump units can be adapted to the requirements of the specific project with a series ® of options. You will find a detailed description of all optional components in Section K 'Options' of this handbook.
Page 141: Control Systems
& play components and pre-addressed control modules. ■ DigiNet controls the heating/cooling capacity of the revers- ible heat pump in the modulation range 0…100 %. You can find a detailed description of the Hoval DigiNet in Section L 'Control systems' of this handbook.
Page 142: Transport And Installation
RoofVent twin pump ® Transport and installation 7 Transport and installation Heat pump ■ Allow sufficient space for maintenance work as well as for the air inlet and air outlet. 7.1 Assembly Caution Risk of injury as a result of incorrect handling. Have RoofVent ERQ250 ≥...
Page 143 RoofVent twin pump ® Transport and installation 7.2 Hydraulic installation Caution Risk of injury as a result of incorrect handling. Hydraulic installation must be carried out by trained specialists only ! Working medium lines The heat pump contains all of the required fittings and has been tested for leak tightness.
Page 144 RoofVent twin pump ® Transport and installation Switch-over heating/cooling Temperature sensor, suction line Terminal box, heat pump Temperature sensor, injection line DigiUnit terminal box novaNet system bus Enable heating/cooling Power supply, zone control panel Trouble input heating/cooling Collective trouble indicator Communication box Fresh air sensor Room air sensor...
Page 145 RoofVent twin pump ® Transport and installation 7.3 Electrical installation ■ Establish plug connections of suction line and injection line temperature sensors. ■ Make sure there is onsite overload protection equipment Caution for the mains connection line of the zone control panel Danger from electric current.
Page 146 RoofVent twin pump ® Transport and installation Component Description Voltage Cable Option Comment DigiUnit terminal Power supply 3 x 400 V 5 x 6 mm² novaNet system bus 2 x 0.16 mm² For bus cable specifications, see Section L, chap. 2.4 Switch-over heating/cooling Volt-free 3 x 0.75 mm²...
Page 147: Specification Texts
■ DigiUnit terminal box with DigiUnit controller as part of the and the condensate separator with collecting channel and Hoval DigiNet control system. drain connection; siphon for connection to a condensate line ■ Control attachment with communication box and expan-...
Page 148 RoofVent twin pump ® Specification texts 8.4 Air-Injector D Exhaust air silencer FSD As an attachment to the exhaust air grille, casing consisting Internally-insulated Aluzinc sheet steel casing with: of Aluzinc sheet steel with built in sound attenuation splitters, ■ Vortex air distributor with concentric outlet nozzle, adjust- for reducing the noise from the exhaust air grille, insertion able vanes and integrated absorber hood...
Page 149 DigiCom DC5 DigiUnit controller Package consisting of operating software, novaNet router ■ Integration of indoor climate units without integrated and connection cables for using the Hoval DigiNet with a PC: DigiUnit controller ■ Monitoring and setting the DigiNet system (operating ■...
Page 151: Supply And Extract Air Handling Unit With Gas Condensing Boiler For Heating High Spaces
RoofVent condens ® Content RoofVent condens ® Supply and extract air handling unit with gas condensing boiler for heating high spaces 1 Use ______________________________________ 150 2 Construction and operation____________________ 150 3 Technical data ______________________________ 157 4 Design example _____________________________ 164 5 Options ___________________________________ 166 6 Control systems_____________________________ 167 7 Transport and installation _____________________ 168...
Page 152: Use
RoofVent condens ® 1 Use 2 Construction and operation 1.1 Intended use The RoofVent condens provides fresh air supply and extract ® air removal as well as heating for large spaces (production RoofVent condens units are used to supply fresh air, for the halls, shopping centres, sports halls, exhibition halls etc.).
Page 153: Construction And Operation
RoofVent condens ® Construction and operation 2.2 Air distribution with the Air-Injector The patented air distributor – called the Air-Injector – is the core element. The adjustable vanes are used to set the air discharge angle. It depends on the air flow rate, the mounting height and the temperature difference between the supply air and room air.
Page 154 RoofVent condens ®...
Page 155 RoofVent condens ® Construction and operation Actuator Air-Injector: adjusts the supply air discharge direction continuously from vertical to hori- zontal Frost controller: prevents the coil freezing Extract air grille Extract air filter: bag filter with differential pressure switch for filter monitoring ER damper and bypass damper: opposed dampers for regulation of energy recovery, with actuator Access panel:...
Page 156 RoofVent condens ® Construction and operation Fresh air inlet through weather louvre door Extract air inlet through extract air grille Filter with differential pressure switch Extract air sensor Fresh air damper with actuator Filter with differential pressure switch Plate heat exchanger Recirculation damper (opposed to the fresh air damper) Supply air fan ER/bypass damper with actuator...
Page 157 RoofVent condens ® Construction and operation 2.3 Operating modes The RoofVent condens has the following operating modes: ® ■ ■ Exhaust air ■ Ventilation ■ Supply air ■ Recirculation ■ Night cooling summer ■ Recirculation night Note In many countries, it is permissible to reduce the air change rate when fresh air temperatures are low.
Page 158 RoofVent condens ® Construction and operation Code Operating mode Diagram Description Recirculation For pre-heating Supply air fan ....On On/Off operation: In the event of heat Exhaust air fan ....Off demand, the RoofVent unit draws in Energy recovery ....0 % ®...
Page 159: Technical Data
Moisture content of extract air max. 12.5 g/kg the heating circuit of the RoofVent condens. Please ® Fresh air temperature min. °C contact Hoval applications support for advice on applications in the food industry. Supply air temperature max. °C Minimum operating time VE2 min.
Page 160 RoofVent condens ® Technical data 3.3 Air flow rate, electrical connections Unit type CON-9 Air distribution Nominal air flow rate Supply air m³/h 8000 1) 2) Exhaust air m³/h 8000 Floor area reached Max. m² Energy recovery Heat recovery efficiency, dry Heat recovery efficiency, wet Fan characteristics Supply voltage...
Page 161 RoofVent condens ® Technical data 3.4 Sound levels Unit type CON-9 Operating mode Position Sound pressure level (at a distance of 5 m) dB (A) Total sound power level dB (A) Octave sound power level 63 Hz dB (A) 125 Hz dB (A) 250 Hz dB (A) 500 Hz dB (A) 1000 Hz dB (A)
Page 162 RoofVent condens ® Technical data 3.5 Heat output Note The performance data listed here applies to the most frequent design conditions. Use the selection program 'HK-Select' to calculate the performance data for other design data. You can download 'HK-Select' free of charge on the Internet. Fresh air tempera- -5 °C -15 °C...
Page 163 RoofVent condens ® Technical data 3.6 Minimum and maximum distances Unit type CON-9 Align the RoofVent units so that no unit draws in the ® exhaust air from another unit as fresh air. Unit clearance X Min. 13.0 The extract air grille must be easily accessible. Max.
Page 164 RoofVent condens ® Technical data 3.7 Dimensions and weight Roof unit LW.C Air-Injector D Filter box short F.C00 / medium F.C25 / long F.C50 Cable feedthroughs for electrical connections Heating section H Access panel Fig. G4: Dimensional drawing for RoofVent condens (dimensions in mm) ®...
Page 165 RoofVent condens ® Technical data Unit type CON-9 Dimensions of Filter box design F.C00 F.C25 F.C50 below-roof unit 1230 1480 1850 2100 2350 1030 Weights Roof unit Below-roof unit (with F00) Filter box F00 Heating section Air-Injector Total (with F00) Filter box F.C25 + 16 Filter box F.C50...
Page 166: Design Example
RoofVent condens ® Design example 4 Design example Design data Example ■ necessary fresh air flow rate or air change rate Fresh air flow rate ........44'000 m³/h ■ Hall geometry (length, width, height) Hall geometry (L x W x H) ...... 72 x 50 x 9 m ■...
Page 167 RoofVent condens ® Design example Checking the heat output Compare the required output for coverage of the fabric Actual output Q = 40 kW heat losses per unit with the data in Table G6. Increase the Required output = 37 kW →...
Page 168: Options
RoofVent condens ® Options 5 Options RoofVent condens units can be adapted to the requirements of the specific project with a series of ® options. You will find a detailed description of all optional components in Section K 'Options' of this handbook.
Page 169: Control Systems
& play components and pre-addressed control modules. ■ DigiNet controls the integrated gas condensing boiler with modulating burner. ■ You can find a detailed description of the Hoval DigiNet in Section L 'Control systems' of this handbook.
Page 170: Transport And Installation
RoofVent condens ® Transport and installation 7 Transport and installation 7.2 Hydraulic installation Caution 7.1 Assembly Risk of injury as a result of incorrect handling. Hydraulic installation must be carried out by trained specialists only ! Caution Risk of injury as a result of incorrect handling. Have In RoofVent condens units, the complete heating circuit is ®...
Page 171 RoofVent condens ® Transport and installation DigiUnit terminal box Fresh air sensor novaNet system bus Room air sensor Power supply DigiMaster Collective trouble indicator Zone control panel Fig. G7: Conceptual drawing...
Page 172 RoofVent condens ® Transport and installation 7.4 Electrical installation Caution Danger from electric current. Electrical installation must be carried out by a qualified electrician! ■ Comply with all relevant legislation (e.g. EN 60204-1). ■ For long supply lines, select cable cross-sections in accordance with the technical regulations.
Page 173 RoofVent condens ® Transport and installation Component Description Voltage Cable Option Comment DigiUnit Power supply 3 x 400 V 5 x 6 mm² terminal box novaNet system bus 2 x 0.16 mm² For bus cable specifications, see Section L, chap. 2.4 Zone control Power supply 3 x 400 V...
Page 174: Specification Texts
■ DigiUnit terminal box with DigiUnit controller as part of the Type H.Z-9 Hoval DigiNet control system. Heat output 60 kW DigiUnit controller DU5 Control module, fully wired with the ventilation unit compo- 8.4 Air-Injector D nents (fans, actuators, temperature sensor, frost controller, filter monitoring, heat generation assembly): ■...
Page 175 Supply air silencer ZSD Package consisting of operating software, novaNet router As an inserted component in the below-roof unit, casing and connection cables for using the Hoval DigiNet with a PC: consisting of Aluzinc sheet steel with built in sound attenu- ■...
Page 176 RoofVent condens ® Specification texts ■ 1 fresh air sensor ■ 1 transformer 230/24 V ■ 2 circuit breakers for transformer (1-pin) ■ 1 relay ■ 1 safety relay (2-pin, external) ■ Input and output terminals (top) ■ 1 wiring diagram of the system ■...
Page 177: Supply And Extract Air Handling Unit With Optimum Fresh Air Rate For Heating High Spaces
RoofVent ® Content RoofVent ® Supply and extract air handling unit with optimum fresh air rate for heating high spaces 1 Use ______________________________________ 208 2 Construction and operation____________________ 208 3 Technical data ______________________________ 215 4 Design example _____________________________ 224 5 Options ___________________________________ 226 6 Control systems_____________________________ 227 7 Transport and installation _____________________ 228 8 Specification texts ___________________________ 232...
Page 178: Use
RoofVent ® 1 Use 2 Construction and operation 1.1 Intended use The RoofVent LH is used for ventilating and heating large ® areas (production halls, shopping centres, sports halls, exhi- RoofVent LH units are used to supply fresh air, for the bition halls etc.).
Page 179: Construction And Operation
RoofVent ® Construction and operation 2.2 Air distribution with the Air-Injector The patented air distributor – called the Air-Injector – is the core element. The air discharge angle is set by means of the adjustable guide vanes. It depends on the air flow rate, the mounting height and the temperature difference between the supply air and room air.
Page 180 RoofVent ® Construction and operation...
Page 181 RoofVent ® Construction and operation Actuator Air-Injector: adjusts the supply air discharge direction continuously from vertical to horizontal Frost controller: prevents the coil freezing Access panel: access to heating coil Supply air fan: twin impeller centrifugal fan with maintenance-free drive Access panel: access to supply air fan Gravity damper:...
Page 182 RoofVent ® Construction and operation Fresh air inlet through weather louvre door Extract air inlet through extract air grille Filter with differential pressure switch Extract air sensor Fresh air damper with actuator Filter with differential pressure switch Supply air fan Gravity damper Silencer and diffuser Exhaust air fan...
Page 183 RoofVent ® Construction and operation 2.3 Operating modes The RoofVent LH has the following operating modes: ® ■ ■ Exhaust air ■ Ventilation ■ Supply air ■ Ventilation (reduced) ■ Night cooling summer ■ Recirculation ■ Emergency operation ■ Recirculation night The DigiNet control system controls these operating modes automatically per control zone, in accordance with the scheduler (exception: emergency operation).
Page 184 RoofVent ® Construction and operation Code Operating mode Diagram Description Exhaust air For special cases Supply air fan ....Off The RoofVent unit extracts spent Exhaust air fan ....On ® room air. There is no room temperature Fresh air damper ....Open Recirculation damper ..
Page 185: Technical Data
- 6 / Unit type RoofVent ® Unit size 6 or 9 Control Design for DigiNet 5 Design for non-Hoval controls Roof unit Roof unit Filter box Filter box, short Filter box, medium Filter box, long Heating section and coil type...
Page 186 RoofVent ® Technical data 3.3 Air flow rate, electrical connections Unit type LH-6 LH-9 Air distribution Nominal air flow rate Supply air m³/h 5500 8000 Exhaust air m³/h 5500 8000 Floor area reached Max. m² Fan characteristics Supply voltage V AC 3 x 400 3 x 400 Permitted voltage tolerance...
Page 187 RoofVent ® Technical data 3.5 Heat output Temperature of the fresh air °C of the extract air Air inlet temperature at the heating coil (with 20 % fresh air) Table I6: Temperature change through intermixing of recirculation air (all values in °C) Unit size 6 10 °C 15 °C...
Page 188 RoofVent ® Technical data Unit size 9 10 °C 15 °C 20 °C LPHW Size Type ∆p ∆p ∆p °C °C kPa l/h kW °C kPa l/h kW °C kPa 90/70 LH-9 70 13.7 3100 65 12.5 2900 59 11.8 2600 LH-9 93 11.3...
Page 189 RoofVent ® Technical data 3.6 Minimum and maximum distances Unit type LH-6 LH-9 Align the RoofVent units so that no unit draws in the ® exhaust air from another unit as fresh air. Unit clearance X Min. 11.0 13.0 The extract air grille must be easily accessible. Max.
Page 190 RoofVent ® Technical data 3.7 Dimensions and weight Roof unit L Access panel Filter box short F00 / medium F25 / long F50 Cable feedthroughs for electrical connections Heating section H Flow Air-Injector D Return Fig. I4: Dimensional drawing for RoofVent LH (dimensions in mm) ®...
Page 191 RoofVent ® Technical data Unit type LH-6 LH-9 Dimensions of 2100 2400 roof unit 1080 1380 1390 1500 1092 1392 Filter box design Dimensions of below-roof unit 940 1190 1440 980 1230 1480 1700 1950 2200 1850 2100 2350 780 1030 780 1030 1240 1048...
Page 192 RoofVent ® Technical data 3.8 Air flow rate with additional pressure drops Pressure increase in Pa Exhaust air Supply air Example: LH-6 An additional pressure drop of 84 Pa results in a new air flow rate of 5100 m³/h. Air flow rate in m³/h Diagram I1: Air flow rate for RoofVent LH-6 with additional pressure drops ®...
Page 193 RoofVent ® Technical data Pressure increase in Pa Exhaust air Supply air LH-9 Air flow rate in m³/h Diagram I2: Air flow rate for RoofVent LH-9 with additional pressure drops ®...
Page 194: Design Example
RoofVent ® Design example 4 Design example Design data Example ■ Minimum fresh air flow rate or minimum air change rate Minimum fresh air flow rate ......6'000 m³/h ■ Minimum fresh air rate Minimum fresh air rate ......... 20 % ■...
Page 195 RoofVent ® Design example Total recirculation heat Q (in kW) = 25'600 · 1.2 · 2.79 · 10 · (22 – 20) = 17 kW · ρ · c · (t – t room = extract air temperature in °C Required heat output total Q (in kW) = 78 + 75 –...
Page 196: Options
RoofVent ® Options 5 Options RoofVent LH units can be adapted to the requirements of the specific project with a series of options. ® You will find a detailed description of all optional components in Section K 'Options' of this handbook. Option Hygiene design When using the RoofVent...
Page 197: Control Systems
Commissioning of the DigiNet is quick and easy thanks to the plug & play components and pre-addressed control modules. You can find a detailed description of the Hoval DigiNet in Part L 'Control systems' of this handbook. Non-Hoval system RoofVent LHs can also be controlled with non-Hoval systems.
Page 198: Transport And Installation
Risk of injury as a result of incorrect handling. Have transport and assembly work carried out by trained The Hoval DigiNet control system is designed for a distributor specialists ! circuit with separate hydraulic connection of the units; i.e. a mixing valve is installed in front of each unit.
Page 199 RoofVent ® Transport and installation DigiUnit terminal box Room air sensor novaNet system bus Trouble input heating Power supply Main pump Connection box DigiMaster Magnetic mixing valve Zone control panel Collective trouble indicator Enable heating Fresh air sensor Heating control panel Fig.
Page 200 (inside) to the roof unit. ■ Wire the mixing valves to the connection box. (There is a plug connection for Hoval magnetic mixing valves.) ■ For injection system: Wire the pump to the DigiUnit terminal box.
Page 201 RoofVent ® Transport and installation Component Description Voltage Cable Option Comment DigiUnit Power supply 3 x 400 V LH-6: 5 x 4 mm² terminal box LH-9: 5 x 6 mm² novaNet system bus 2 x 0.16 mm² For bus cable specifications, see Section L, chap.
Page 202: Specification Texts
■ Maintenance-free, direct-drive exhaust air fan made of copper tubes and aluminium fins and the frost ■ DigiUnit terminal box with DigiUnit controller as part of the controller. Hoval DigiNet control system. Type H.__-… DigiUnit controller DU5 Heat output …...
Page 203 Hoval DigiNet control system Magnetic mixing valve ..HV...
Page 204 ■ Integration of indoor climate units without integrated Package consisting of operating software, novaNet router DigiUnit controller and connection cables for using the Hoval DigiNet with a PC: ■ Room temperature average value ■ Monitoring and setting the DigiNet system (operating ■...
Page 205: Supply And Extract Air Handling Unit With Optimum Fresh Air Rate For Heating And Cooling High Spaces
RoofVent ® Content 1 Use ______________________________________ 236 2 Construction and operation____________________ 236 3 Technical data ______________________________ 243 4 Design example _____________________________ 254 5 Options ___________________________________ 256 6 Control systems_____________________________ 257 7 Transport and installation _____________________ 258 8 Specification texts ___________________________ 262 RoofVent ®...
Page 206: Use
RoofVent ® 1 Use 2 Construction and operation 1.1 Intended use The RoofVent LK provides fresh air supply and extract air ® removal as well as heating and cooling for large spaces RoofVent LK units are used to supply fresh air, for the (production halls, shopping centres, sports halls, exhibition ®...
Page 207: Construction And Operation
RoofVent ® Construction and operation 2.2 Air distribution with the Air-Injector The patented air distributor – called the Air-Injector – is the core element. The adjustable vanes are used to set the air discharge angle. It depends on the air flow rate, the mounting height and the temperature difference between the supply air and room air.
Page 208 RoofVent ®...
Page 209 RoofVent ® Construction and operation Actuator Air-Injector: adjusts the supply air discharge direction continuously from vertical to horizontal Condensate connection Frost controller: prevents the coil freezing Access panel: access to the heating/cooling coil Supply air fan: twin impeller centrifugal fan with maintenance-free drive Access panel: access to supply air fan Gravity damper:...
Page 210 RoofVent ® Construction and operation Fresh air inlet through weather louvre door Air-Injector with actuator Filter with differential pressure switch Extract air inlet through extract air grille Fresh air damper with actuator Extract air sensor Supply air fan Filter with differential pressure switch Silencer and diffuser Gravity damper Heating/cooling coil LPHW/LPCW...
Page 211 RoofVent ® Construction and operation 2.3 Operating modes The RoofVent LK has the following operating modes: ® ■ ■ Exhaust air ■ Ventilation ■ Supply air ■ Ventilation (reduced) ■ Night cooling summer ■ Recirculation ■ Emergency operation ■ Recirculation night The DigiNet control system controls these operating modes automatically per control zone, in accordance with the scheduler (exception: emergency operation).
Page 212 RoofVent ® Construction and operation Code Operating mode Diagram Description Exhaust air For special cases Supply air fan ....Off The RoofVent unit extracts spent Exhaust air fan ....On ® room air. There is no room temperature Fresh air damper ....Open Recirculation damper ..
Page 213: Technical Data
+ F00 - K.C - Unit type RoofVent ® Unit size 6 or 9 Control Design for DigiNet 5 Design for non-Hoval controls Roof unit Roof unit Filter box Filter box, short Filter box, medium Filter box, long Heating/cooling section...
Page 214 RoofVent ® Technical data 3.3 Air flow rate, electrical connections Unit type LK-6 LK-9 Air distribution Nominal air flow rate Supply air m³/h 5000 7650 Exhaust air m³/h 5000 7650 Floor area reached Max. m² Fan characteristics Supply voltage V AC 3 x 400 3 x 400 Permitted voltage tolerance...
Page 215 RoofVent ® Technical data 3.4 Sound levels Unit type LK-6 LK-9 Operating mode Position Sound pressure level (at a distance of 5 m) dB (A) Total sound power level dB (A) Octave sound power level 63 Hz dB (A) 125 Hz dB (A) 250 Hz dB (A) 500 Hz dB (A) 1000 Hz dB (A)
Page 216 RoofVent ® Technical data 3.5 Heat output Temperature of the fresh air °C of the extract air Air inlet temperature at the heating coil (with 20 % fresh air) Table J6: Temperature change through intermixing of recirculation air (all values in °C) 10 °C 15 °C 20 °C...
Page 217 RoofVent ® Technical data 3.6 Cooling capacities Temperature and rel. humidity of the fresh air °C Temperature of 24 °C 28 °C the extract air 80 % 26 °C 29 °C 80 % 28 °C 31 °C 70 % Air inlet conditions at the cooling coil (with 20 % fresh air) Table J8: Temperature change through intermixing of recirculation air (all values in °C) Unit size 6...
Page 218 RoofVent ® Technical data Unit size 9 Temp. 6/12 °C 8/14 °C 10/16 °C Type Q ∆p ∆p ∆p °C kW kW °C kPa l/h kg/h kW kW °C kPa l/h kg/h kW kW °C kPa l/h kg/h 3600 3100 2600 5400 4700...
Page 219 RoofVent ® Technical data 3.7 Minimum and maximum distances Unit type LK-6 LK-9 Align the RoofVent units so that no unit draws in the ® exhaust air from another unit as fresh air. Unit clearance X Min. The extract air grille must be easily accessible. Max.
Page 220 RoofVent ® Technical data 3.8 Dimensions and weight Roof unit L Cable feedthroughs Filter box short F00 / medium F25 / long F50 Return Heating/cooling section K Flow Air-Injector D Condensate connection Access panel Fig. J4: Dimensional drawing for the RoofVent LK (dimensions in mm) ®...
Page 221 RoofVent ® Technical data Unit type LK-6 LK-9 Dimensions of 2100 2400 roof unit 1080 1380 1390 1500 1092 1392 Filter box design Dimensions of below-roof unit 940 1190 1440 980 1230 1480 2050 2300 2550 2160 2410 2660 780 1030 780 1030 1000 1240...
Page 222 RoofVent ® Technical data 3.9 Air flow rate with additional pressure drops Pressure increase in Pa Exhaust air Supply air Example: LK-6 An additional pressure drop of 42 Pa results in a new air flow rate of 4800 m³/h. Air flow rate in m³/h Diagram J1: Air flow rate, RoofVent LK-6 with additional pressure drops ®...
Page 223 RoofVent ® Technical data Pressure increase in Pa Exhaust air Supply air LK-9 Air flow rate in m³/h Diagram J2: Air flow rate, RoofVent LK-9 with additional pressure drops ®...
Page 224: Design Example
RoofVent ® Design example 4 Design example Note The following design example relates to cooling mode. The design rating for heating mode can be performed analogously to the design example above in Section I 'RoofVent LH.' ® Design data Example ■...
Page 225 RoofVent ® Design example Total ventilation cold requirement Q (in kW) = 18'360 · 1.2 · 2.79 · 10 · (30 – 24) = 37 kW = V · ρ· c · (t – t fresh room ρ = Specific air density 1.2 kg/m³ = Specific heat capacity of the air 2.79 ·...
Page 226: Options
RoofVent ® Options 5 Options RoofVent LK units can be adapted to the requirements of the specific project with a series of options. ® You will find a detailed description of all optional components in Section K 'Options' of this handbook. Option Hygiene design When using the RoofVent...
Page 227: Control Systems
Commissioning of the DigiNet is quick and easy thanks to the plug & play components and pre-addressed control modules. You can find a detailed description of the Hoval DigiNet in Section L 'Control systems' of this handbook. Non-Hoval system RoofVent LKs can also be controlled with non-Hoval systems.
Page 228: Transport And Installation
Risk of injury as a result of incorrect handling. Have transport and assembly work carried out by trained The Hoval DigiNet control system is designed for a distributor specialists ! circuit with separate hydraulic connection of the units; i.e. a mixing valve is installed in front of each unit.
Page 229 RoofVent ® Transport and installation DigiUnit terminal box Main pump novaNet system bus DigiMaster Power supply Zone control panel Connection box Selector switch heating/cooling Magnetic mixing valve Enable heating Collective trouble indicator Enable cooling Heating control panel Fresh air sensor Heating circuit Room air sensor Cooling circuit...
Page 230 (inside) to the roof unit. ■ Wire the mixing valves to the connection box. (There is a plug connection for Hoval magnetic mixing valves.) ■ For injection system: Wire the pump to the DigiUnit terminal box.
Page 231 RoofVent ® Transport and installation Component Description Voltage Cable Option Comment DigiUnit Power supply 3 x 400 V LK-6: 5 x 4 mm² terminal box LK-9: 5 x 6 mm² novaNet system bus 2 x 0.16 mm² For bus cable specifications, see Section L, chap.
Page 232: Specification Texts
■ DigiUnit terminal box with DigiUnit controller as part of the fins, the condensate separator with collecting channel and Hoval DigiNet control system. the frost controller; siphon for connection to a condensate line (included in delivery) DigiUnit controller DU5...
Page 233 Aluzinc sheet steel casing, containing the LPHW heating mixing valve for connection to the connection box; sized for coil made of copper tubes and aluminium fins and the frost the respective heating/cooling coil and the Hoval DigiNet controller. control system Type H.__-…...
Page 234 DigiCom DC5 DigiUnit controller Package consisting of operating software, novaNet router ■ Integration of indoor climate units without integrated and connection cables for using the Hoval DigiNet with a PC: DigiUnit controller ■ Monitoring and setting the DigiNet system (operating ■...
Page 235 Options Content 1 Availability _________________________________ 266 2 ColdClimate design __________________________ 268 3 Explosion-proof design _______________________ 268 4 Hygiene design _____________________________ 268 5 Oil-proof design _____________________________ 269 6 High-pressure fan supply air ___________________ 270 7 High-pressure fan exhaust air __________________ 272 8 Fans with variable air flow rate _________________ 274 9 Hydraulic assembly diverting system ____________ 274 10 Magnetic mixing valve _______________________ 277...
Page 236: Availability
Options Availability 1 Availability 1.1 Available options The following optional components are available for the various types of unit: RoofVent – – – ® RoofVent – – ® RoofVent twin heat – – – – – – – ® RoofVent twin cool –...
Page 237 Extract air filter in front of the extract air grille × × × Drop eliminator × Condensate pump × Heating and cooling in the 4-pipe system × Design for injection system × × Design for non-Hoval control × × Legend: × = not combinable Table K2: Non-combinable options...
Page 238: Coldclimate Design
(Zone 1). ■ Cold-resistant materials ■ Fans with downtime heating For more detailed information, please contact Hoval ■ Valve actuators with spring return and additional heating customer service. ■ Heating coil or heating/cooling coil type X with water-side...
Page 239: Oil-Proof Design
Options Oil-proof design 5 Oil-proof design Please note the following: ■ Install an oil/condensate drain with a siphon trap in accordance with the local provisions to remove these RoofVent units in oil-proof design are suitable for use in types of emulsions. ®...
Page 240: High-Pressure Fan Supply Air
Options High-pressure fan supply air 6 High-pressure fan supply air Technical data The technical data differs from the standard design as follows: The high-pressure supply air fan is used to overcome ■ Fan characteristics (see Table K4) additional pressure drops, e.g. through a supply air duct. ■...
Page 241 Options High-pressure fan supply air Pressure increase in Pa Standard LKW/LK Standard LHW/LH HZ-6 High-pressure LKW/LK High-pressure LHW/LH Air flow rate in m³/h Diagram K1: Air flow rate for RoofVent units with high-pressure fan supply air HZ-6 ® Pressure increase in Pa Standard LKW/LK Standard LHW/LH HZ-9...
Page 242: High-Pressure Fan Exhaust Air
Options High-pressure fan exhaust air 7 High-pressure fan exhaust air Technical data The technical data differs from the standard design as follows: The high-pressure fan exhaust air is used to overcome ■ Fan characteristics (see Table K7) additional pressure drops, e.g. through an extract air duct. ■...
Page 243 Options High-pressure fan exhaust air Pressure increase in Pa Standard LKW/LK Standard LHW/LH HF-6 High-pressure LKW/LK High-pressure LHW/LH Air flow rate in m³/h Diagram K3: Air flow rate for RoofVent units with high-pressure fan exhaust air HF-6 ® Pressure increase in Pa Standard LKW/LK Standard LHW/LH HF-9...
Page 244: Fans With Variable Air Flow Rate
Options Fans with variable air flow rate 8 Fans with variable air flow rate 9 Hydraulic assembly diverting system If fans with variable air flow rate are installed in the Assemblies for hydraulic diverting which are optimally RoofVent units, the air flow rate can be varied continuously matched to the units are available for easy installation of ®...
Page 245 Options Hydraulic assembly diverting system Pressure drop in kPa Pressure drop in kPa HG 6/AB HG 9 10/D Water flow rate in l/h Diagram K5: Default values for the balancing valves HG 6/C HG 9 10/AB 1.0 1.2 1.4 HG 9 10/C Water flow rate in l/h...
Page 246 Options Hydraulic assembly diverting system Automatic air vent Screw joint coil Balancing valve Screw joint boiler system Flow Magnetic mixing valve Ball valve Return Fig. K3: Dimensional drawing Type Mixing valve Balancing valve Screw joint for coil type HG-6/AB 726 1060 20-5HV STAD DN32 1¼...
Page 247: Magnetic Mixing Valve
Options Magnetic mixing valve 10 Magnetic mixing valve Mixing valves which are optimally matched to the units are available for easy installation of RoofVent units. They have ® the following specifications: ■ modulating control valve with magnetic drive ■ with integrated position control and response ■...
Page 248: Fresh Air Silencer
Options Fresh air silencer 11 Fresh air silencer 12 Exhaust air silencer The fresh air silencer reduces the noise from RoofVent units The exhaust air silencer reduces the noise from RoofVent ® ® through the weather louvre door. It consists of an Aluzinc units through the exhaust air grille.
Page 249: Supply Air Silencer
Options Supply air silencer 13 Supply air silencer 14 Extract air silencer The supply air silencer reduces the noise from RoofVent The extract air silencer reduces the noise from RoofVent ® ® units within the room. It consists of an Aluzinc casing with units within the room.
Page 250: Acoustic Cowl
Options Acoustic cowl 15 Acoustic cowl 17 Air outlet box The acoustic cowl reduces the noise level in the room; it is When using the RoofVent units in low-roofed halls, the air ® installed in the Air-Injector. This does not change the outside outlet box can be installed in place of the Air-Injector.
Page 251: Extract Air Filter In Front Of The Extract Air Grille
Options Extract air filter in front of the extract air grille 18 Extract air filter in front of the 19 Drop eliminator extract air grille Moisture in the extract air can condense in the plate heat exchanger. In order to ensure that no condensate drips into In applications the unit even in applications with very moist extract air, a ■...
Page 252: Condensate Pump
® LHW, performance data of the units is available upon Type request). Output (at 3 m delivery head) max. 150 l/h The Hoval DigiNet Tank capacity max. 1.9 l ■ automatically switches between heating and cooling, ■ controls the mixing valve heating and cooling (and if appli-...
Page 253 Options Heating and cooling in the 4-pipe system DigiUnit terminal box Fresh air sensor Zone control panel novaNet system bus Room air sensor Enable heating Power supply Trouble input heating Enable cooling Connection box Trouble input cooling Heating control panel Magnetic mixing valve cooling Main pump heating Heating circuit...
Page 254: Design For Injection System
Options Design for injection system 22 Design for injection system Heating pump Instead of a diverting system, an injection system can also be installed in the load circuit. Note The injection system is particularly well suited for applications where only a low heat output is required due to high internal heat gains.
Page 255 Options Design for injection system DigiUnit terminal box Mixing valve Main pump novaNet system bus Collective trouble indicator DigiMaster Power supply Fresh air sensor Zone control panel Connection box Room air sensor Enable heating Heating pump Trouble input heating Heating control panel Fig.
Page 257 Control systems Content 1 General information _________________________ 288 2 System setup _______________________________ 288 3 Operating options ___________________________ 289 4 Zone control panel __________________________ 291 5 Control components in the units ________________ 293 6 Options ___________________________________ 294 7 Alarms and monitoring _______________________ 297 Control systems...
Page 258: General Information
2.3 Unit level A DigiUnit controller is installed in each main unit (= fresh Hoval's DigiNet is a control system that was specially devel- air unit or supply air unit). This controls the unit individually oped for decentralised indoor climate units. The system was according to local conditions.
Page 259: Operating Options
Control systems Operating options 3 Operating options 3.1 DigiMaster operator terminal The DigiMaster is a touch panel with a colour display, making it simple to operate the system. It gives trained users access to all information and settings that are necessary for normal operation: ■...
Page 260 Control systems Operating options 3.2 Operation via PC and DigiCom 3.3 DigiEasy operator terminal The system can be operated easily using a PC and DigiCom. The DigiEasy is an additional operator terminal for untrained The operating software clearly displays the system on the users.
Page 261: Zone Control Panel
3.4 Integration at management level with DigiBac An automation station with BACnet communication card – known as DigiBac – allows you to integrate the Hoval DigiNet Hoval indoor climate units are grouped into control zones, at management level. Communication takes place over which are controlled from the zone control panel.
Page 262 Control systems Zone control panel Design Size Type Dimensions in mm (W x H x Control panel Coated sheet steel (RAL No. 7035) SDZ1 Short circuit resistance I 10 kA SDZ2 Connecting terminals SDZ3 Installation Floor or wall installation SDZ4 Ambient conditions SDZ5 1000...
Page 263: Control Components In The Units
Control systems Control components in the units 5 Control components in the units Power supply for RoofVent unit ® The following are installed in each main unit (= fresh air unit or supply air unit): ■ An extract air sensor 3 x AC 400 V ■...
Page 264: Options
Control systems Options 6 Options 8 special functions with 2 switches Special functions override the automatic program of the control zone. Two selector switches ( I P 65) are installed in the door of the zone control panel (outside the window, if 6.1 Options for operating DigiNet fitted, for the DigiMaster).
Page 265 Additional output terminals controller are installed for the parallel connection of additional units. The power supply for Hoval indoor climate units with inte- The number of parallel controlled units is restricted by the grated DigiUnit controller is integrated in the zone control maximum switch power of 6.5 kW (∆ ...
Page 266 Control systems Options Humidity sensor Type: The sensor measures the relative humidity in the room air as Cooling in the 4-pipe system a basis for humidity control. It is installed on the wall in the There is a separate coil for heating and for cooling. The occupied area, at a height of about 1.5 m.
Page 267: Alarms And Monitoring
Alarms and monitoring 7 Alarms and monitoring Caution The Hoval DigiNet monitors itself. All alarms are entered in the alarm list and displayed on the operator terminals. If the power supply for the DigiUnit terminal box Priority A alarms are also displayed via the collective trouble is interrupted, frost protection and monitoring are indicator.
Page 269 System design Content 1 Roof frame _________________________________ 300 2 Location of the temperature sensors ____________ 301 3 Orientation of the coil connections ______________ 301 4 Condensation lilmit __________________________ 302 5 Duct connection ____________________________ 303 6 Paint finish _________________________________ 303 7 Socket ____________________________________ 303 8 Corrosion-protected design ___________________ 303 9 Lightning protection system ___________________ 303 10 General checklist ___________________________ 303...
Page 270: Roof Frame
System design Roof frame 1 Roof frame Roof frames are required for installing RoofVent units in the ® roof. Please consider the following in the design process: ■ The access panel and extract air grille must be freely accessible under the roof. ■...
Page 271: Location Of The Temperature Sensors
System design Location of the temperature sensors 2 Location of the temperature sensors 2.1 Room air sensor Install the sensor at a height of about 1.5 m in a representa- tive location in the occupied area. Its measured values must not be distorted by the presence of sources of heat or cold (machines, direct sunlight, windows, doors, etc.).
Page 272: Condensation Lilmit
System design Condensation lilmit 4 Condensation lilmit RoofVent twin heat / twin cool / twin pump ® At high humidity levels or extremely low fresh air tempera- tures, humidity in the extract air may condense in plate heat exchanger 2. Diagram M1 shows under what air conditions condensation occurs.
Page 273: Duct Connection
® for applications in which the air flows contain aggressive elements. Please contact Hoval customer service. 9 Lightning protection system Make sure you obtain professional planning and design of a lightning protection system for the units and/or for the entire building.
Page 275 Operation Content 1 Operation __________________________________ 306 2 Maintenance and repair ______________________ 306 3 Dismantling ________________________________ 308 4 Waste disposal _____________________________ 308 Operation...
Page 276: Operation
Risk of damage to property as a result of performing switch to the 'Off' position. Wait for the fans to stop. initial start-up on your own authority. Commissioning must be performed by Hoval customer service only ! Caution Danger from electric current. The isolation switch Checklist to prepare for commissioning: only switches off the fans;...
Page 277: Maintenance And Repair
Check condensate pump every two months during the cooling period and clean it if required. 2.4 Repairs Caution Risk of injury is work is not performed appropriately. Repair work must be carried out by Hoval customer service personnel ! RoofVent LH, LK ®...
Page 278: Dismantling
Operation Dismantling 3 Dismantling Proceed as follows: ■ Drain the heating or cooling circuit. – On the RoofVent direct cool and RoofVent twin pump: ® ® Caution The refrigerant must be drawn off by a refrigeration Risk of injury if work is not performed appropriately. specialist.
Page 280 Responsibility for energy and environment International Hoval Aktiengesellschaft The Hoval brand is internationally known as one of the leading suppliers of indoor Austrasse 70 climate control solutions. More than 65 years of experience have given us the nec- 9490 Vaduz, Liechtenstein essary capabilities and motivation to continuously develop exceptional solutions and Tel.

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Hoval RoofVent LHW-6 Design Handbook

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Roofvent

Supply and Extract Air Handling Unit with High-Capacity Energy Recovery for Heating and Cooling High Spaces

Supply and Extract Air Handling Unit with Reversible Heat Pump for Heating and Cooling High Spaces

Supply and Extract Air Handling Unit with Gas Condensing Boiler for Heating High Spaces

Supply and Extract Air Handling Unit with Optimum Fresh Air Rate for Heating High Spaces

Supply and Extract Air Handling Unit with Optimum Fresh Air Rate for Heating and Cooling High Spaces

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