LG MULTI V WATER IV ARWN Series Installation Manual
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LG MULTI V WATER IV ARWN Series Installation Manual

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INSTALLATION MANUAL
AIR CONDITIONER
• Please read this installation manual completely before installing the product.
• Installation work must be performed in accordance with the national
wiring standards by authorized personnel only.
• Please retain this installation manual for future reference after reading
it thoroughly.your set and retain it for future reference.
MODELS : ARWN Series
P/NO : MFL30215327
www.lg.com

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Summary of Contents for LG MULTI V WATER IV ARWN Series

  • Page 1 • Installation work must be performed in accordance with the national wiring standards by authorized personnel only. • Please retain this installation manual for future reference after reading it thoroughly.your set and retain it for future reference. MODELS : ARWN Series www.lg.com P/NO : MFL30215327...

  • Page 2: Table Of Contents

    ARWN Series Outside unit Installation Manual TABLE OF CONTENTS Safety Precautions ......................3 Installation Process .......................7 Outside units Information....................8 Environment-friendly Alternative Refrigerant R410A ..........14 Select the Best Location....................14 Installation space ......................15 Water control .......................17 Lifting method ......................19 Installation ........................20 Refrigerant piping installation ..................24 Device protection unit....................29 Refrigerant piping system ..................31 Y branch pipe and header branch pipe type .............46...

  • Page 3: Safety Precautions

    Safety Precautions Safety Precautions To prevent injury to the user or other people and property damage, the following instructions must be followed. ■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications. This symbol indicates the possibility of death or serious injury.
  • Page 4 Safety Precautions When installing and moving the air condi- Do not reconstruct to change the settings of tioner to another site, do not charge it with a the protection devices. different refrigerant from the refrigerant specified on the unit. • If a different refrigerant or air is mixed with the original re- •...
  • Page 5 Safety Precautions ■ Installation Always check for gas (refrigerant) leakage Do not install the product where the noise or after installation or repair of product. hot air from the outside unit could damage the neighborhoods. • Low refrigerant levels may cause failure of •...
  • Page 6 Safety Precautions Be very careful about product transportation. • Only one person should not carry the product if it weighs more than 20 kg. • Some products use PP bands for packaging. Do not use any PP bands for a means of transportation. It is dangerous. •...

  • Page 7: Installation Process

    Select Installation Location Installation Process Indicate clearly who is to be responsible for switch settings Determination of division work Make relationship between outside, indoor, remote controller, and option connections clear. Preparation of contract drawings (Prepare control circuit diagram) Take account of gradient The foundation must be level even Sleeve and insert work Outside unit foundation work...

  • Page 8: Outside Units Information

    Outside units Information Outside units Information • Ratio of the running Indoor Units to the Outside: Within 10 ~ 100% • A combination operation over 100% cause to reduce each indoor unit capacity. n Combination Ration(50~200%) Outside Number Connection Capacity Single outside units 200% Double outside units...
  • Page 9 Outside units Information Unit 1 Unit System Capacity (HP) Combination Unit ARWN180LAS4 ARWN200LAS4 Model Independent Unit ARWN180LAS4 ARWN200LAS4 Refrigerant Precharged Amount Maximum Connectable Number of Indoor Units 140 x 1 140 x 1 Net Weight 309 x 1 309 x 1 755 ×...
  • Page 10 Outside units Information Unit 2 Unit System Capacity (HP) Combination Unit ARWN340LAS4 ARWN360LAS4 Model ARWN200LAS4 ARWN180LAS4 Independent Unit ARWN140LAS4 ARWN180LAS4 Refrigerant Precharged Amount 3.0 + 5.8 3.0 + 3.0 Maximum Connectable Number of Indoor Units (140 x 1) + (127 x 1) 140 x 2 Net Weight (309 x 1) + (280 x 1)
  • Page 11 Outside units Information Unit 3 Unit System Capacity (HP) Combination Unit ARWN480LAS4 ARWN500LAS4 ARWN520LAS4 ARWN200LAS4 ARWN200LAS4 ARWN200LAS4 Model Independent Unit ARWN140LAS4 ARWN160LAS4 ARWN180LAS4 ARWN140LAS4 ARWN140LAS4 ARWN140LAS4 Refrigerant Precharged Amount 3.0 + 5.8 + 5.8 3.0 + 3.0 + 5.8 3.0 + 3.0 + 5.8 Maximum Connectable Number of Indoor Units (140 x 1) + (127 x 2) (140 x 2) + (127 x 1)
  • Page 12 Outside units Information Unit 4 Unit System Capacity (HP) Combination Unit ARWN620LAS4 ARWN640LAS4 ARWN660LAS4 ARWN200LAS4 ARWN200LAS4 ARWN200LAS4 Model ARWN200LAS4 ARWN200LAS4 ARWN200LAS4 Independent Unit ARWN120LAS4 ARWN120LAS4 ARWN140LAS4 ARWN100LAS4 ARWN120LAS4 ARWN120LAS4 Refrigerant Precharged Amount 3.0 + 3.0 + 3.5 + 3.4 3.0 + 3.0 + 3.5 + 3.5 3.0 + 3.0 + 5.8 + 3.5 Maximum Connectable Number of Indoor Units (140 x 2) + (125 x 2)
  • Page 13 Outside units Information Unit 4 Unit System Capacity (HP) Combination Unit ARWN740LAS4 ARWN760LAS4 ARWN200LAS4 ARWN200LAS4 Model ARWN200LAS4 ARWN200LAS4 Independent Unit ARWN200LAS4 ARWN180LAS4 ARWN140LAS4 ARWN180LAS4 Refrigerant Precharged Amount 3.0 + 3.0 + 3.0 + 5.8 3.0 + 3.0 + 3.0 + 3.0 Maximum Connectable Number of Indoor Units (140 x 3) + (127 x 1) 140 x 4...

  • Page 14: Environment-Friendly Alternative Refrigerant R410A

    Environment-friendly Alternative Refrigerant R410A Environment-friendly Alternative Refrigerant R410A • The refrigerant R410A has the property of higher operating pressure in comparison with R22. Therefore, all materials have the characteristics of higher resisting pressure than R22 ones and this character- istic should be also considered during the installation. R410A is an azeotrope of R32 and R125 mixed at 50:50, so the ozone depletion potential (ODP) of R410A is 0.

  • Page 15: Installation Space

    Installation space Installation space Individual Installation Required the minimum space as shown below for installation and check. If the space is not fit on this drawing, consult with LG. : Service area (unit : mm) Product (Outside unit) Water pipe...
  • Page 16 Installation space Two Layer Installation Space required for two layer installation as shown below considering passage for air and people. : Service area (unit : mm) H-Beam Support <Front View> Outside Unit Outside Unit...

  • Page 17: Water Control

    Water control Water control Water control • Keep the water temperature between 10~45°C. Other it may cause the breakdown. - Standard water supply temperature is 30°C for Cooling and 20°C for heating. • Properly control the water velocity. Otherwise it may cause the noise, pipe vibration or pipe contraction, expansion according to the temperature.
  • Page 18 Water control Standard table for water purity control The water may contain many foreign substances and hence may influence the performance and lifetime of the prod- uct due to the corrosion of the condenser and water pipe. (Use water source that complies with the below standard table for water purity control.) If you use water supply other than the tap water to supply the water for the cooling tower, you must do a water quality inspection.

  • Page 19: Lifting Method

    Lifting method Lifting method • When carrying the unit suspended, pass the ropes under the unit and use the two suspension points each at the front and rear. • Always lift the unit with ropes attached at fours points so that impact is not applied to the unit. •...

  • Page 20: Installation

    Installation Installation Location of anchor bolt The location of anchor bolt WARNING • Be sure to install unit in a place strong enough to withstand its weight. Any lack of strength may cause unit to fall down, resulting in a personal injury. •...
  • Page 21 Installation Preparation of Piping Main cause of gas leakage is defect in flaring work. Carry out correct flaring work in the following procedure. 1) Cut the pipes and the cable. ■ Use the accessory piping kit or the pipes purchased lo- Copper Slanted Uneven Rough tube...
  • Page 22 Installation FLARE SHAPE and FLARE NUT TIGHTENING TORQUE Precautions when connecting pipes • See the following table for flare part machining dimensions. • When connecting the flare nuts, apply refrigerant oil to the inside and outside of the flares and turn them three or four times at first.
  • Page 23 Installation HEAT INSULATION 1. Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance (over 120°C). Fastening band (accessory) 2. Precautions in high humidity circumstance: This air conditioner has been tested according to the "ISO Conditions with Mist" and confirmed that there is not any default.

  • Page 24: Refrigerant Piping Installation

    Refrigerant piping installation Refrigerant piping installation WARNING Always use extreme care to prevent the refrigerant gas (R410A) from leakage while using fire or flame. If the refrigerant gas comes in contact with the flame from any source, such as a gas stove, it breaks down and generates a poisonous gas which can cause gas poisoning.
  • Page 25 Refrigerant piping installation Connection of Outside units [Unit:mm] Outside units Model Low Pressure Gas Pipe Liquid Pipe 331(13-1/32) 416(16-3/8) 314(12-3/8) 408(16-1/16) I.D. I.D. 15.88(5/8) 15.88(5/8) I.D. I.D. 28.58(1-1/8) 28.58(1-1/8) I.D. 12.7(1/2) I.D. 9.52(3/8) I.D. 19.05(3/4) I.D. 22.2(7/8) (Master) (Slave1) I.D.31.8(1-1/4) I.D.34.9(1-3/8) ARCNB21 2 Unit...
  • Page 26 Refrigerant piping installation Connection of High/Low Pressure Common pipe Slave2 Outside Unit Slave Outside Unit Slave1 Outside Unit Main Outside Unit Master Outside Unit 2 Outside Units 3 Outside Units 1) For the high/low pressure common pipe, connect both master outside unit and slave outside units to the pipe by using el- bows.
  • Page 27 Refrigerant piping installation Installation of water pipe 1) Water pipe system diagram • The water pressure resistance of the water pipe system of this product is 1.98MPa • When the water pipe passes indoors, make sure to execute heat insulation on the pipe so that water drops do not form on the outer side of the water pipe.
  • Page 28 Refrigerant piping installation Pipe thickness Shear stress Tensile stress Bending moment Torque (N . m) (kgf . m) (N . m) (kgf . m) inch (kN) (kgf) (kN) (kgf) 12.7 19.05 1200 11.5 25.4 11.2 1120 15.5 31.8 1 1/4 14.5 1450 87.5...

  • Page 29: Device Protection Unit

    Refrigerant piping installation Device protection unit Strainer on water pipe To protect the water cooling type product, you must install a strainer with 50 mesh or more on the heat water supply pipe. If not installed, it can result in damage of heat exchanger by the following situation. 1.
  • Page 30 Product protection device Flow switch work • It is recommended to install the flow switch to the water collection pipe system Cover connecting to the outside unit. (Flow switch acts as the 1st protection device when the heat water is not supplied. Micro-switch If a certain level of water does not flow after installing the flow switch, an error sign Adjustment screw...

  • Page 31: Refrigerant Piping System

    Refrigerant piping system Refrigerant piping system Y branch method Single outside unit system Example : 5 Indoor Units connected Ⓐ : Outdoor Unit Ⓑ : 1st branch direction Ⓒ : Y branch Ⓓ : Indoor Unit Ⓔ : Header branch L150m (200 m : Conditional application) Ⓕ...
  • Page 32 Refrigerant piping system Headerv branch Method Single outside unit system Example : 6 Indoor Units connected Ⓐ : Outdoor Unit Ⓑ : 1st branch Ⓒ : Y branch Ⓓ : Indoor Unit Ⓔ : Header branch L 150m Ⓕ : Suture 40 m Series outside unit system Slave3...
  • Page 33 Refrigerant piping system Y/Header branch method Single outside unit system Example : 5 Indoor Units connected Ⓐ : Outdoor Unit Ⓑ : 1st branch Ⓒ : Y branch Ⓓ : Indoor Unit Ⓔ : Header branch Ⓕ : Suture L 150m(200m : Conditional application) 40m(90m : Conditional application) * If it is conditionally installed, refer to (table 1).
  • Page 34 Refrigerant piping system ➲ Refrigerant pipe diameter from branch to branch (B,C,D) ➲ Total pipe length limited Classification Section Type Y branch Y/header branch Header branch A+B+b ≤ 150 m A+B+C+D+e Maximum pipe A+f ≤ 150 m ≤ 150 m A+C+e ≤...
  • Page 35 Refrigerant piping system ➲ Refrigerant pipe diameter from outdoor unit to first branch. (A, E, F, G) Increased Pipe Diameter Upward Outdoor unit Standard Pipe Diameter When pipe length is 90m or more from total capacity ODU to 1st branch Liquid pipe(mm) Gas pipe(mm) Liquid pipe(mm)
  • Page 36 Refrigerant piping system ◆ (Table 1) Cautions during the installation of Maximum pipe length 90m after the 1st branch WARNING To install maximum pipe length after the 1st branch exceeding 40 m and 90 m or less, the following condi- tions must be satisfied.
  • Page 37 Refrigerant piping system Indoor unit connection ➔ Indoor unit connecting pipe from branch (a~f) Liquid pipe Gas pipe Indoor unit capacity [kW(Btu/h)] [mm(inch)] [mm(inch)] Ø6.35(1/4) Ø12.7(1/2) ≤ 5.6(19,100) Ø9.52(3/8) Ø15.88(5/8) < 16.0(54,600) Ø9.52(3/8) Ø19.05(3/4) ≤ 22.4(76,400) Ø9.52(3/8) Ø22.2(7/8) < 33(112,600) Oil trap application method between outside units •...
  • Page 38 Refrigerant piping system - The pipes between the outdoor units must maintain horizontal levelness or give an inclination to prevent a back flow toward the slave outdoor unit. Otherwise, the unit may not operate properly. (Example 1) Toward indoor unit Toward indoor unit (Example 2) Toward indoor unit...
  • Page 39 Refrigerant piping system - When connecting the pipes between the outdoor units, the accumulation of oil in the slave outdoor unit should be avoided. Otherwise, the unit may not operate properly. (Example 1) Toward indoor unit Toward indoor unit (Example 2) Toward indoor unit (Example 3) Oil Trap...
  • Page 40 Refrigerant piping system Calculation of amount of refrigerant The calculation of the additional charge should take account of the diameter and length of the pipe. Product Charge(kg) Ex) 10HP Additional charge (kg) Outside unit Header branch Total liquid pipe (m): Ø25.4 mm x 0.480(kg/m) Indoor unit Total liquid pipe (m): Ø22.2mm...
  • Page 41 Refrigerant piping system Note: Fill in the f-gas Label attached on outside about the quantity of the fluorinated greenhouse gases ① Manufacturing site (See Model Name label) ② Installation site (If possible being placed adjacent to the service points for the addition or removal of re- frigerant) ③...
  • Page 42 Refrigerant piping system Caution 1. Use the following materials for refrigerant piping. • Material: Seamless phosphorous deoxidized copper pipe • Wall thickness : Comply with the relevant local and national regulations for the designed pressure 3.8MPa. We recommend the following table as the minimum wall thickness. Outer diameter 6.35 9.52...
  • Page 43 Refrigerant piping system Branch pipe Fitting Y branch To Outside Unit To Branch Piping or Indoor Unit • Ensure that the branch pipes are attached horizontally or vertically (see the diagram below.) Horizontal Facing Facing plane downwards upwards Within +/- 10 Viewed from point A in direction of arrow Within 3...
  • Page 44 Refrigerant piping system • When the number of indoor units to be connected to the branch pipes is less than the number of branch pipes available for connection then cap pipes should be fitted to the surplus branches. Pinched pipe •...
  • Page 45 Refrigerant piping system Thermal insulation of refrigerant piping Be sure to give insulation work to refrigerant piping by covering liquid pipe and gas pipe separately with enough thickness heat-resistant polyethylene, so that no gap is observed in the joint between indoor unit and insulating material, and insulating materials themselves.

  • Page 46: Y Branch Pipe And Header Branch Pipe Type

    Y branch pipe and header branch pipe type Y branch pipe and header branch pipe type Y branch pipe [unit:mm] Models Gas pipe Liquid pipe I.D12.7 I.D12.7 I.D6.35 I.D.6.35 I.D9.52 I.D15.88 I.D15.88 I.D9.52 I.D.6.35 I.D15.88 ARBLN01621 I.D12.7 I.D.9.52 O.D9.52 I.D19.05 O.D15.88 I.D12.7 I.D22.2...
  • Page 47 Y branch pipe and header branch pipe type Header [unit:mm] Models Gas pipe Liquid pipe ID12.7 ID6.35 ID6.35 ID12.7 4 branch ID9.52 ID15.88 ID9.52 ARBL054 ID15.88 ID12.7 ID9.52 ID15.88 ID19.05 ID12.7 ID6.35 7 branch ID12.7 ID9.52 ID15.88 120 150 ID15.88 ARBL057 ID9.52 ID15.88...

  • Page 48: Leakage Test And Vacuum

    Leakage test and vacuum Leakage test and vacuum Leak test Leak test should be made by pressurizing nitrogen gas to 3.8 MPa(38.7kgf/cm ). If the pressure does not drop for 24 hours, the system passes the test. If the pressure drops, check where the nitrogen leaks. For the test method, refer to the following figure.
  • Page 49 Leakage test and vacuum Vacuum Vacuum drying should be made from the service port provided on the outside unit’s service valve to the vacuum pump commonly used for liquid pipe, gas pipe and high/low pressure common pipe. (Make Vacuum from liquid pipe, gas pipe and high/low pressure common pipe with the service valve closed.) * Never perform air purging using refrigerant.

  • Page 50: Electrical Wiring

    Electrical Wiring Electrical Wiring Areas of Caution 1. Follow ordinance of your governmental organization for technical standard related to electrical equipment, wiring regulations and guidance of each electric power company. WARNING Be sure to have authorized Electrical engineers do electric work using special circuits in accor- dance with regulations and this installation manual.
  • Page 51 Electrical Wiring Outdoor Unit Outdoor Unit Master Slave1 Slave2 Master Slave1 Slave2 Indoor Indoor Indoor Indoor Unit Unit Unit Unit Remote Remote Remote Remote controller controller controller controller Outdoor Unit Outdoor Unit Master Slave1 Slave2 Master Slave1 Slave2 Indoor Indoor Indoor Indoor Unit...
  • Page 52 Electrical Wiring Transmission and Power Lines 1) Transmission cable • Types : shielding wire CVVS or CPEVS • Use wires of size : 1.0 ~ 1.5 mm • Insulation material : PVC • Maximum allowable temperature: 60°C • Maximum allowable line length: under 300m 2) Remote control cable •...
  • Page 53 Electrical Wiring ◆ Example for mistake of wiring • Do not separately connect the power of the indoor unit. 3phase 4lines power cable Transmission cable(3lines): wired remote controller Single phase 60Hz 220V Transmission cable(2lines Shield cable) : Indoor~ Outside unit Single phase 60Hz 220V 3 phase 4 wires power supply...
  • Page 54 Electrical Wiring 1. 50Hz ◆ Example Connection of Transmission Cable 1 Outside Unit 3 Phase 4 Wires Power line(R, S, T, N) Transmission line (3 line): Wired remote control Single Phase of power supply line(L, N) Power supply switch (Switch fuse : ELCB) Transmission line (2 shield line): Between Indoor Unit and Outside Unit 3 Phase 4 Wires Power supply...
  • Page 55 Electrical Wiring ◆ Example Connection of Transmission Cable 2 Outside Units Master ■ When the power source is connected 3 Phase 4 Wires Power line(R, S, T, N) In series between the units. Slave Transmission line (3 line): Wired remote control Single Phase of power supply line(L, N) Power supply switch Transmission line (2 shield line):...
  • Page 56 Electrical Wiring ◆ Example Connection of Transmission Cable 3 Outside Units Master ■ When the power source is connected In series between the units. 3 Phase 4 Wires Power line(R, S, T, N) Slave1 Transmission line (3 line): Wired remote control Slave2 Single Phase of power supply line(L,N) Transmission line (2 shield line):...
  • Page 57 Electrical Wiring 2. 60Hz ◆ Example Connection of Transmission Cable 1 Outside Unit 3 Phase 4 Wires Power line(R, S, T, N) Transmission line (3 line): Wired remote control Single Phase of power supply line(L, N) Power supply switch Transmission line (2 shield line): Between Indoor Unit and Outside Unit (Switch fuse : ELCB) 3 Phase 4 Wires Power supply...
  • Page 58 Electrical Wiring ◆ Example Connection of Transmission Cable 2 Outside Units Master ■ When the power source is connected 3 Phase 4 Wires Power line(R, S, T, N) In series between the units. Slave Transmission line (3 line): Wired remote control Single Phase of power supply line(L, N) Power supply switch Transmission line (2 shield line):...
  • Page 59 Electrical Wiring ◆ Example Connection of Transmission Cable 3 Outside Units Master ■ When the power source is connected In series between the units. 3 Phase 4 Wires Power line(R, S, T, N) Slave1 Transmission line (3 line): Wired remote control Slave2 Single Phase of power supply line(L,N) Transmission line (2 shield line):...
  • Page 60 Electrical Wiring ◆ Example Connection of Communication Cable [BUS type] • Connection of communication cable must be installed like below figure between indoor unit to outside unit. [STAR type] • Abnormal operation can be caused by communication defect, when connection of communication cable is installed like below figure(STAR type).
  • Page 61 Electrical Wiring Dip switch setting Setting the function Select the mode/function/option/value using ‘▶’, ‘◀’ Button and confirm that using the ‘ ’ button after dip switch No.5 is turned on. CAUTION • It is only executed when all indoor units are off. DIP-SW01 7 - Segment SW04C ( : cancel) SW03C (...
  • Page 62 Electrical Wiring Dip switch setting 1. Set the dip switch and turn on the power of the outside unit to check whether the set value is correctly en- tered in the 7 segment. 2. This function is shown for only 2 seconds after the power is connected. ■...
  • Page 63 Electrical Wiring Indoor unit auto addressing • The address of the indoor units would be set by auto addressing. 1) Wait for 3 minutes after applying power supply (master and slave outside unit, indoor unit) 2) Press the switch of the outside unit (SW02V) for 5 seconds. 3) A "88"...
  • Page 64 Electrical Wiring ◆ The Procedure of Automatic Addressing Turn OFF all DIP switches of the Power On master main board before automatic address setting. Waiting 3 minutes Press RED Button for 5 sec. (SW01C) Automatic addressing start 7-segment LED = 88 Don’t press RED Button (SW01C) •...
  • Page 65 Electrical Wiring Group Number setting Group Number setting for Indoor Units ① Confirm the power of whole system(Indoor Unit, Outside Unit) is OFF, otherwise turn off. ② The transmission lines connected to CEN terminal should be connected to central control of Outside unti with care for their polarity( A →...
  • Page 66 Electrical Wiring Outside unit Dry Contact installation and connection • Connect wires as below figure at the hole of backside of Outside Unit Dry Contact. • Insert the wire in the connection hole pushing the "Push" button. • Setting Main PCB Dip SW of Master Outside Unit. Mode Change Outside Unit Heating...

  • Page 67: Test Run

    Test Run Test Run Water supply system test run • Before executing the test run for the product, you must first test the heat source water system. The test run for the product must be executed after checking the flow rate and temperature of the heat source water supplied.
  • Page 68 Test Run Precaution before test run Check whether the air is completely removed and the water supply is flowing smoothly. Check whether there is any refrigerant leakage of any disconnected or loose communication or power wire, or use the electric wiring diagram to check the wiring connection condition. Check whether the power and communication wire are connected.
  • Page 69 Test Run How to Cope with Abnormal Test Run Item Phenomenon Cause Checkpoint and resolution Check whether the heat source water supply pump is operating. When connecting the flow switch, Check whether the heat source water supply pipe is clogged. heat-sourced water doesn’t flow CH24 (Clean strainer, valve locked, valve issue, air trapped etc.)
  • Page 70 Test Run Daily check/management 1. Water quality control The plate type heat exchanger is not structured to be disassembled, cleaned or replaced with parts. To prevent corrosion or scaling on the plate type heat exchanger, special care must be taken to control the water quality. Water quality must satisfy the minimum criteria of the reference water quality items.
  • Page 71 Test Run Self-Diagnosis Function Error Indicator • This function indicates types of failure in self-diagnosis and occurrence of failure for air condition. • Error mark is displayed on display window of indoor units and wired remote controller, and 7-segment LED of outside unit control board as shown in the table.
  • Page 72 Test Run Display Title Cause of Error * Master Outside Unit Low Compression Ratio Limited Master Outside Unit stayed under low Compression limit for 3 minutes * Master Outside unit Communication error between Master Outside unit inverter compressor current detection (CT) sen- Master outside unit PFC and inverter board sor disconnection or short circuit * Master outside unit inverter compressor CT sen-...
  • Page 73 Test Run Display Title Cause of Error Communication Error Between Master Outdoor Failing to receive Slave Unit signal at main PCB of Master Outdoor 1 0 4 Unit and Other Outdoor Unit Unit Master Outdoor Unit Liquid pipe Temperature Liquid pipe temperature sensor of Master Outdoor Unit is open or 1 1 3 Sensor Error short...

  • Page 74: Cooling Tower Applied Method

    Cooling tower applied method Cooling tower applied method Open type Closed type cooling tower cooling tower side side Heat exchange [Open type cooling tower + Middle heat exchanger] [Closed type cooling tower] Heat exchanger is installed between the cooling Heat source water of the cooling tower is supplied tower and outside unit system piping, and the tem- directly to the outside unit system.

  • Page 75: Caution For Refrigerant Leak

    Caution For Refrigerant Leak Caution For Refrigerant Leak The installer and system specialist shall secure safety against leakage according to local regulations or standards. The following standards may be applicable if local regulations are not available. Introduction Though the R410A refrigerant is harmless and incombustible itself , the room to equip the air conditioner should be large to such an extent that the refrigerant gas will not exceed the limiting concentration even if the refrigerant gas leaks in the room.
  • Page 76 Caution For Refrigerant Leak (3) With partition and without opening which serve as passage of air to adjoining room Outside unit Indoor unit Smallest room ■ Calculate refrigerant concentration Total amount of replenished In case the result of calculation exceeds refrigerant in refrigerant facility (kg) Refrigerant concentration the limiting concentration, perform the...

  • Page 77: Water Solenoid Valve Control

    Water Solenoid Valve Control Water Solenoid Valve Control Central Control(Use DDC Port) Water CN_18 CN_22 Water Main PCB (220 V Out) (to DDC) Solenoid PI 485 1(L) 2(N) 3(L) 4(N) Valve ※ BMS : Building Management System Individual Control(Use 220V Output Port) CN_18 CN_22 Water...
  • Page 78 Outside Unit Outside Unit...

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