Table of Contents
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WARNING
result, causing property damage or personal injury.
–
other appliance.
WHAT TO DO IF YOU SMELL GAS
–
Do not try to light any appliances.
Do not touch any electrical switch; do not use any phone in your building.
Immediately call the National Gas Emergency Helpline on (Freephone) 0800 111999 or your gas
supplier from a neighbour's phone. Follow the instructions received.
Installation and service must be performed by a Gas Safe registered installer, service agency or
–
the gas supplier.
Installation &
Operation
Manual
These appliances are for use with natural gas or LPG.
(An LPG conversion kit is included with the boiler.)
Type : B23-B33-B53-C13-C33-C43-C53-C63-C83
Gas
Model
NCB-20LHWE
NCB-23LHWE
Natural Gas
NCB-28LHWE
NCB-33LHWE
NCB-20LHWE
NCB-23LHWE
LPG
NCB-28LHWE
NCB-33LHWE
Keep this manual near this boiler for future reference
whenever maintenance or service is required.
Condensing System Boiler
GC Number
41-709-01
41-709-02
41-709-03
41-709-04
41-709-05
41-709-06
41-709-07
41-709-08
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Table of Contents
Related Manuals for Navien NCB-20LHWE
Summary of Contents for Navien NCB-20LHWE
- Page 1 Condensing System Boiler Installation & Operation Manual These appliances are for use with natural gas or LPG. (An LPG conversion kit is included with the boiler.) Type : B23-B33-B53-C13-C33-C43-C53-C63-C83 Model GC Number NCB-20LHWE 41-709-01 NCB-23LHWE 41-709-02 Natural Gas NCB-28LHWE 41-709-03 NCB-33LHWE 41-709-04...
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Page 2: Table Of Contents
8.5 Terminal block 2 Connection 2.4 Components 2.5 Dimensions 9. Wiring Examples for Di erent Applications 39 2.6 Operating Modes 9.1 Connecting the Navien Smart Room Controller 2.7 Installation Procedure (Optional) 9.2 Y Plan Applications 3. Installing the Boiler 9.3 S Plan Applications 3.1 Choosing an Installation Location... -
Page 3: Safety Information
1. Safety Information The following safety symbols are used in this manual. Read and DANGER follow all safety instructions in this manual precisely to avoid unsafe operating conditions, re, explosion, property damage or personal injury. DANGER Indicates an imminently hazardous situation which, if not avoided, could result in severe injury or death. - Page 4 WARNING WARNING This appliance can be used by children aged from 8 years and above and persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning use of the appliance in a safe way and understand the hazards involved.
- Page 5 CAUTION DANGER Do not turn on the boiler unless the water and gas supplies are fully opened. Doing so may damage the boiler. Do not turn on the water if the cold BURN water supply shut-o valve is closed. Doing so may damage the boiler. To prevent burns: Do not use this boiler for anything Use the lowest operating temperature...
- Page 6 The Codes of good practice and regulations refer to the latest versions of the same. Navien ensures that this product contains no harmful The installation must also comply with the following European substances and that no harmful materials have been used in its Standards: manufacture.
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Page 7: About The Boiler
2. About the Boiler 2.1 Items Included nstalling the boiler. If it seems like there is a problem, do not use the boiler. Contact your supplier. Keep the included items out of the reach of children, as they can be dangerous. When you no longer wish to use the boiler, disable any parts that could be potentially hazardous. Installation &... -
Page 8: Technical Data
2.3 Technical Data The following table lists the general speci cations for the boiler. NCB- NCB- NCB- NCB- Speci cations Unit 20LHWE 23LHWE 28LHWE 33LHWE Heat input range 20.0/4.2 24.0/4.2 29.0/5.1 34.0/4.0 Heat output range @ 80/60°C 19.5/3.9 23.4/3.9 28.3/4.9 33.2/3.8 Condensing heat output range @ 50/30°C 21.4/4.5... - Page 9 NCB- NCB- NCB- NCB- Unit 20LHWE 23LHWE 28LHWE 33LHWE Max. vertical coaxial length Ø80/125 Equivalent elbow length @ 90° Ø80/125 Equivalent elbow length @ 45° Ø80/125 Equivalent length of adapter Ø60/100 => Ø80/125 Max. dual duct length Ø80/80 Equivalent elbow length @ 90° Ø80 Equivalent elbow length @ 45°...
- Page 10 The following table lists the product information requirements (EU regulation No 811/2013 and No 813/2013) KD Navien Symbol Unit NCB-20LHWE NCB-23LHWE NCB-28LHWE NCB-33LHWE Condensing boiler Low-temperature (**) boiler B1 boiler Cogeneration space heater Combination heater Rated heat output rated Seasonal space heating energy η...
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Page 11: Components
2.4 Components The following diagram shows the key components of the boiler. Component assembly diagrams and particular parts lists are included in the Appendices. Flue Duct Fan & Motor Ignitor & Flame Rod Mounting Frame Front Panel Circulation Pump Condensate Trap NCB-20/23/28LHWE About the Boiler... - Page 12 Mixing Chamber Single Venturi Primary Heat Exchanger Air Pipe Secondary Heat Exchanger Gas Valve Return Adapter Filter Assembly Pressure Relief Valve Space Heating Supply Space Heating Return Gas supply inlet NCB-20/23/28LHWE 12 About the Boiler...
- Page 13 Flue Duct Fan & Motor Ignitor & Flame Rod Mounting Frame Front Panel Circulation Pump Condensate Trap NCB-33LHWE About the Boiler...
- Page 14 Mixing Chamber Dual Venturi Primary Heat Exchanger Secondary Heat Exchanger Gas Valve Return Adapter Filter Assembly Pressure Relief Valve Space Heating Supply Space Heating Return Gas supply inlet NCB-33LHWE 14 About the Boiler...
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Page 15: Dimensions
Diameter Ø60/100, Flue exhaust/Air intake Ø80/125 Space heating supply 22 mm Gas supply inlet 22 mm Space heating return 22 mm Overhead View Bottom View 90 mm 130 mm 285 mm *NCB-20LHWE/23LHWE: 358 mm NCB-28LHWE/33LHWE: 408 mm About the Boiler... -
Page 16: Operating Modes
2.6 Operating Modes 2.6.2 Operating According to Outdoor Temperature Conditions The Outdoor Reset Control feature may be used to enhance 2.6.1 Operating in Space Heating Mode energy e ciency while maintaining optimal heating performance. With the Outdoor Reset Control, the space heating To operate the Space heating mode, press the Space heating temperature setting automatically changes according to the button on the front panel and select a heating temperature... -
Page 17: Installation Procedure
2.7 Installation Procedure The ow diagram below provides a step-by-step description of the recommended procedure for clear, easy installation of the NCB LHWE boiler in its nal location. A detailed description is given of the procedure in the sequenced sections below: Wall-mounting »... -
Page 18: Installing The Boiler
Installing the boiler in a location Carefully consider the following factors when choosing an without a drain will void the warranty and Navien will not be installation location: responsible for water damage that occur as a result. For more information about condensate drainage, refer to “4.3 Connecting... - Page 19 Adequate installation clearances Clearance from: Indoor Installation 250 mm minimum CAUTION Front 600 mm minimum Bottom 200 mm minimum Do not install the boiler on carpeting. Clean, debris and chemical-free combustion air Install the boiler in an area that allows for service and maintenance access to utility connections, piping, lters, Do not install the boiler in areas where dust and debris may and traps.
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Page 20: Mounting The Boiler To The Wall
3.2 Mounting the Boiler to the Wall WARNING Navien NCB LHWE boilers come with an upper mounting bracket that is pre-drilled at 400 mm on center for easy The boiler is heavy. Always lift the unit with assistance. Be installation on standard wall studs. If the strength of the wall... -
Page 21: Installing The System Piping
For correct installation, all the requirements and recommendations described in the The primary and secondary heat exchangers of the Navien Regulation for Heating Installations in Buildings (RITE) must NCB LHWE boiler are designed to attain the highest level of be complied with, together with all other national and/or local heat transfer in a compact design. -
Page 22: Installing A System Application
4.3 Connecting the Condensate Drain Line technicians, authorised to do so. The Navien NCB LHWE boiler creates condensation when it operates. This condensation has an acidic pH of 3-5. Follow For correct installation, all the requirements and all local codes and regulations when disposing of condensate recommendations described in the Regulation for from the boiler. - Page 23 Before connecting the condensate drain, choose one of the To connect the condensate drain: following disposal options: 1. Connect a drain line to the condensate trap. The condensate trap outlet will allow 21.5mm. Use only corrosion-resistant material for the drain line, such as PVC or CPVC.
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Page 24: Pressure Relief Valve
4.4 Pressure Relief Valve The system must be lled with approved Note equipment and comply with all regulations for system ll. The requirements recommended for the pressure relief valve are as follows: To perform an air purge after initially lling the boiler pipes, the pump will run for 5 minutes and The pressure relief valve is calibrated to be activated at a 20 seconds. -
Page 25: Connecting The Gas Supply
5. Connecting the Gas Supply To connect the gas supply: WARNING 1. Connect the gas supply pope to the connection located on the underside of the apliance. If a gas type other than the one speci ed on the boiler reference plate is used, it could cause a re or even an 2. -
Page 26: Gas Pipe Material
5.1 Gas Pipe Material 5.3 Measuring the Inlet Gas Pressure WARNING WARNING The boiler must be left running for 10 minutes before The boiler cannot function properly without su cient inlet checking the gas pressure, to obtain thermal equilibrium. gas pressure. Measuring the inlet gas pressure should be performed by a licensed professional only. - Page 27 3. Leave the faucet on until the boiler shuts down due to a lack 5. Loosen the screws indicated in the gure below and of gas supply, and then turn o the hot water faucet. connect a manometer to the pressure port. Reset the manometer to zero before use.
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Page 28: Flue System
6. Flue System The minimum distances between the ue exhaust terminal and the building elements must comply with those shown in the WARNING following table: Improper ue of the boiler can result in excessive levels of carbon monoxide, which can lead to severe personal injury. Flue should be performed only by a licensed professional. -
Page 29: Selecting A Flue System
For vertical ducts, the outlet must be at least 60 cm Dual Duct System Note from any opening. For dual duct system, t the components as shown in the gure: The dimensions (B, C, D, and E) may be reduced to 25 mm, as long as the ue terminal is extended to 1. -
Page 30: Coaxial Systems
6.3 Coaxial Systems 6.3.1 Horizontal Coaxial Removal (Type C Standard Removal System B 500 or 1,000 140 min W all Ø60/100 => Max. length: A+B-(1 x 45°elbow) = 20-1 = 19 m Ø80/125 => Max. length: A+B-(1 x 45°elbow) = 68-1 = 67 m Ø60/100 =>... -
Page 31: Dual Duct Systems
6.4 Dual Duct Systems 6.3.2 Vertical Coaxial Removal (Type C Standard Removal System 6.4.1 Horizontal Dual Duct Removal (Type C Standard Removal System Ø60/100 => Max. length: A=21 m Ø80/125 => Max. length: A=70 m Extended Removal System Ø80/80 => Max. length: A+B+C-(1 x 90°elbow) = 110-2.2 = 107.8 m Minimum 350 mm Ø60/100 =>... - Page 32 6.4.2 Vertical Dual Duct Removal (Type C Extended Removal System Minimum 370 mm Ø80/80 => Max. length: A+B+C+D+E+F-(4 x 90°elbow) = 110-(4 x 2.2) = 101.2 m Pipe Diameter Maximum Equivalent Elbow (mm) Length (m) Length (m) Ø80/80 90° Ø80/80 => Max. length: A+B+C+D-(2 x 45°elbow) = 110-(2 x 1.4) = 107.2 m Pipe Diameter Maximum...
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Page 33: Measuring Flue Length
Carefully study the diagrams representing the di erent types of removal and select the one that best suits the conditions of your installation. To choose the removal accessories required for each installation, see the list of accessories on the Navien price list. Maximum Total Length Pipe Diameter... -
Page 34: Setting The Dip Switches
7. Setting the DIP Switches Dip Switch 2 (Set of 4) CAUTION The DIP SW 2 on the circuit board con gures the external DHW tank. Do not remove the front cover unless the power to the boiler is turned o or disconnected. Failure to do so may Switch Function Setting... -
Page 35: Connecting Electrical Supplies
8. Connecting Electrical Supplies 2. Remove the boiler’s front cover by loosening the four screws securing it to the case. WARNING Improperly connecting the electrical supplies can result in electrical shock and electrocution. Follow all applicable electrical codes of the local authority having jurisdiction. Connecting the electrical components should be performed only by a licensed professional. -
Page 36: Connecting The Power Supply Cables
8.2 Connecting the Power Supply Cables 4. Insert all these elements in the cable gland and press on the lid “A” until the cable is su ciently xed in place and the unit is sealed. To correctly establish the boiler’s electrical connection, follow the indications given in the gure and the indications on the identi cation label for the terminal strip connections. -
Page 37: Terminal Block 1 Connection
8.3 Setting the DIP Switches and 8.4 Terminal block 1 Connection Parameters for the Terminal blocks 1 and 2 The terminal block 1 is located to the right of the panel. Power supply, room thermostat, OpenTherm, and the outdoor The DIP SW on the front panel that con gures source of the heat temperature sensor may be connected to the terminals of the demand is listed in the following table. -
Page 38: Terminal Block 2 Connection
8.4.2 Connecting the Cylinder Stat 8.4.4 OpenTherm® Protocol The boiler is designed to be connected to a Cylinder Stat. The OpenTherm® is an industry standard modulating control thermostat cables are to be connected to the terminals 3 and 4 available from several control manufacturers and the NCB of the terminal block 1. -
Page 39: Wiring Examples For Di Erent Applications
As the Navien NCB series boiler has a dedicated connector for the Navien Smart Room Controller on the back of the front panel, terminal connection at the terminal block is not required. -
Page 40: Y Plan Applications
9.2 Y Plan Applications 9.2.1 Y Plan with Volt Free Room Stat, Cylinder Stat, and 3 port diverter valve (DHW) (CH) (DHW) (CH) * 3 port diverter valve CH(L) CH(L) COM(N) COM(N) DHW(L) DHW(L) (DHW) (CH) (DHW) (CH) * 3-way valve CAUTION -The boiler is supplied for connection the above valves to 230VAC - Ensure it is connected to the right terminal... - Page 41 Wiring Examples for Different Applications...
- Page 42 9.2.3 Y Plan with 230 V Two Channel Device Motorised mid- position diverter valve Cylinder Stat Orange Gray White Room Stat 230 VAC 230 VAC 3 port diverter Cylinder Temp. Room Stat Output valve Sensor Call Junction box Programmer Use a junction box to make wiring connections. A junction box is not included in the product. Note CAUTION Before connecting devices to the terminals of the terminal blocks 1 and 2, refer to 8.
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Page 43: S Plan Applications
9.3 S Plan Applications 9.3.1 S Plan with 230 V Two Channel Device 230 VAC 230 VAC 3 port diverter Cylinder Temp. Room Stat valve Cylinder Stat Room Stat Output Sensor Call Call Junction box Gray Gray Motor Motor NO NC Brown Brown Blue... -
Page 44: Installation Check List
After installing the boiler, review the following checklist. Complete the boiler start-up process by carrying out the checks listed in the table below. If you have additional questions or need assistance with installation, contact an o cial Technical Assistance Service (TAS), or refer to the technical support section of Navien’s website (www.navien.co.uk). Check Value measured... -
Page 45: Operating The Boiler
11. Operating the Boiler 11.1 Turning the Boiler On or O 11.2 Adjusting the Temperature To turn the boiler on or o , press the Power button. 11.2.1 Adjusting the Space Heating Temperature To adjust the heating temperature: 1. Press the Space heating button. The space heating temperature will ash. -
Page 46: Viewing Basic Information
11.2.2 Adjusting the DHW Temperature You can adjust the temperature while the display is ashing. If no buttons are pressed for 5 seconds or if the INFO button is pressed, the current temperature setting will be stored automatically. WARNING Take note of the original heating temperature in Note Before adjusting the water temperature, read “To prevent case you want to restore it to the default. -
Page 47: Setting The Operation Mode
11.4 Setting the Operation Mode Display Description 1. Using the Front Panel, press and hold the ECO, Summer/ External DHW tank temperature Winter and Space heating button at the same time for over not in use (with cylinder stat) 5 seconds until “1.TST” is displayed. Cold water inlet temperature not in use Not in use (with cylinder temp. -
Page 48: Setting The Parameters
11.5 Setting the Parameters If you enter an incorrect password 10 times or make Note no inputs for 5 minutes, the boiler will return to the Normal mode. You can modify parameter settings for boiler operations, such as the space heating and DHW temperature ranges, in di erent To return to the previous mode, press the Reset operating conditions. - Page 49 Setting the Heat Load for the Outdoor Reset Control Mode Setting the Lowest Outdoor Temperature Display Description Display Description Outdoor Reset heat load types Lowest outdoor temperature 1: Finned tube baseboard (°C) 2: FAN coil 3: Cast iron baseboard 4: Low mass radiant 5: High mass radiant Lowest outdoor temperature 6: Radiator...
- Page 50 Setting the Min Heat Capacity for Space Heating Setting the Boost Interval Time Display Description Display Description Space heating min heat Boost interval time (min) capacity (%) This menu is used to con gure the desired space heating The boost interval time may be set to prevent interruption in capacity.
- Page 51 Setting the Pump Overrun Time Setting the DHW Wait Time Display Description Display Description Pump overrun time (min) DHW wait time (min) The pump overrun time is the duration the circulation pump The DHW wait time is the duration that the boiler maintains the continues to run between the space heating supply or return DHW supply mode after a DHW demand.
- Page 52 Setting the Burner-On Temperature Setting the Supply Absolute MIN Temperature Display Description Display Description Supply absolute Min set point Burner-on temperature (°C) (°C) During space heating, the boiler turns on the burner when This menu can be used to change the minimum supply the space heating supply temperature is below the burner-on temperature range in Supply Control mode.
- Page 53 Setting the Return Absolute MIN Temperature Setting the LCD Back Light This menu may be used to set the status of LCD back light. Display Description Default: ON Return absolute MIN set point Display Description (°C) LCD back light maintains minimum brightness.
- Page 54 Setting the DHW Priority Time Anti-Legionella Function Setting Setting Remark Display Description Anti-Legionella Function Default: OFF DHW priority time (min) Resetting All Parameters Display Description DHW tank not in use Do not reset parameters (No) This menu may be used to set the operation priority time for the domestic hot water mode.
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Page 55: Resetting The Boiler
11.6 Resetting the Boiler If an error message appears, reset the boiler to resolve the problem. To reset the boiler, press the Reset button. If resetting the boiler does not solve the problem, refer to the Troubleshooting section of this manual or contact Technical Assistance Service. -
Page 56: Maintaining The Boiler
12. Maintaining the Boiler 12.1 Cleaning the Boiler 3. Disconnect the power supply from the boiler. 4. Close the gas valve. CAUTION Make sure the boiler is turned o and the power supply is disconnected before cleaning the boiler. The boiler may remain hot for several minutes after it is turned o . -
Page 57: Cleaning The Return Adapter Filter
The water that remains in the plumbing lines CAUTION will drain out. Damage due to freezing is not covered by the Navien limited warranty. If the boiler is connected to a circuit that could freeze, the circuit pipes must be suitably insulated. All pipes installed outdoors must be insulated according to applicable legislation. -
Page 58: Maintenance Schedules
12.5 Maintenance Schedules If hot water will not ow and you suspect that the boiler is frozen, follow these steps: 1. Press the Power button on the front panel to turn o the Owner maintenance boiler. Check boiler area 2. Close the gas valve. Daily Check pressure / temperature gauge Check ue piping... - Page 59 Addressing the Reported Problems WARNING Inspect any problems reported by the owner and correct before proceeding. Follow the service and maintenance procedures given throughout this manual and in component literature shipped with the boiler. Failure to perform the service Inspecting the Installation Area and maintenance could result in damage to the boiler or system.
- Page 60 Checking the Ignition Ground Wiring WARNING 1. Check that the ground wire is in good condition and securely attached to the boiler casing. Failure to inspect for the above conditions and have them repaired can result in severe personal injury. 2.
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Page 61: Appendices
Gas Ori ce (refer to below table) This boiler is con gured for Natural Gas at the factory. If conversion to Propane Gas is required, use the conversion kit Model supplied with the boiler. NCB-20LHWE Ø5.7 Ø4.5 WARNING NCB-23LHWE Ø5.7 Ø4.5... - Page 62 6. Loosen the four screws indicated in the gure. 8. With the internal components exposed, locate the gas inlet pipe and the gas valve in the middle of the unit, as shown in Figure 2-1 and Figure 2-2. Gas Inlet Pipe Gas Valve 7.
- Page 63 Attempting to alter or measure the gas valve outlet pressure could result in damage to the valve, causing potential severe personal injury or substantial property damage. The Navien NCB LHWE boilers are shipped ready to re natural gas only. Appendices...
- Page 64 Packing Packing Gas Ori ce Gas Ori ce Packing O-ring Figure 5-1. Exploded View of Gas Pipe Assembly Figure 5-2. Exploded View of Gas Pipe Assembly (NCB-20/23/28LHWE) (NCB-33LHWE) DANGER See Figure 5-2. Inspect the O-ring between the venturi and gas valve inlet adapter whenever they are disassembled. The O-ring must be in good condition and must be installed.
- Page 65 1 & 2 Model Gas Type Selection G30 (LPG) 1-ON, 2-OFF G31 (LPG) 1-ON, 2-ON 9.27% 8.78% NCB-20LHWE Table 1. The DIP Switch Setting by Fuel Selection 10.40% 10.00% 9.20% 8.65% NCB-23LHWE DANGER 10.42% 10.00% When conversion is required, be sure to set the front 9.10%...
- Page 66 The set screw is located behind the screw-on Note cover. This must be removed rst. Gas type [20 mbar] [37 mbar] Model Load Kcal/h Max. 16,770 19.5 20.0 2.142 0.804 NCB-20LHWE Min. 3,354 0.450 0.169 Max. 20,124 23.4 24.0 2.570 0.964 NCB-23LHWE Min. 3,354 0.450 0.169...
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Page 67: Cleaning The Heat Exchanger
13.2 Cleaning the Heat Exchanger 4. Using a Phillips screwdriver, remove four screws (two at the bottom and two at the top) of the front cover assembly to gain access to the internal components. WARNING Before cleaning the heat exchanger, make sure the boiler is To properly maintain the boiler, you should clean the heat exchanger annually. - Page 68 7. Use a Phillips screwdriver to remove the two screws (four 9. Remove the ve bolts securing the chamber brackets. screws for NCB-33LHWE) where gas inlet pipe is attached to the fan motor assembly. Loosen the hex nut located above the gas valve and remove the gas pipe.
- Page 69 It is important to keep electric parts of the boiler Note safe from water. Navien recommends to use a hose. If the water pressure of the hose is too high, water may splash to other electric parts of the boiler.
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Page 70: Wiring Diagram
13.3 Wiring Diagram Appendices... -
Page 71: Ladder Diagram
13.4 Ladder Diagram Appendices... -
Page 72: Outdoor Temperature Sensor (Optional)
4. Connect the wires to the terminal block. 5. Attach the cap to the body. Navien Outdoor Temperature Sensor Outdoor Temperature Sensor Installation Guidelines Avoid areas with temperature uctuations by direct sunlight, and where the temperature may not be representative of true outdoor temperature. - Page 73 GAS BOILER SYSTEM COMMISSIONING CHECKLIST This Commissioning Checklist is to be completed in full by the competent person who commissioned the boiler as a means of demonstrating compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference. CONTROLS Optimum start control Fitted...
- Page 74 SERVICE RECORD It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed. Service Provider SERVICE 01 SERVICE 02 ² % ² % ² % ² % SERVICE 03 SERVICE 04 ² % ²...
- Page 75 Memo...
- Page 76 Memo...
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- Page 78 Memo...
- Page 80 Model number Serial number Date purchased Installation location and type Error code, if any appears on the front panel display Version: 1.00 (Aug. 22, 2018) Navien Ltd 3000 Cathedral Hill, Guildford, Surrey, GU2 7YB TEL 0844 332 2323 www.navien.co.uk...
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