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Due to our policy of continuous product innovation, some specifications may change without notification.  

©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

Additional screens can be accessed by tabs on the main screen.  

Additional screens include the following: 
1.  Cycleview: Graphic of internal components including:

• Compressors showing actual speeds
• EEVs
• IDUs
• Temperature and pressure sensors
• Four-way reversing valve 

2.  Graph: Full screen graph of actual high and low pressures and high 

and low pressure limits. A sliding bar enables user to go back in 

time and view data. 

3.  Control FTN: Enables user to turn on IDUs in 1.8°F increments. 

4.  Useful Tab

• Unit Conversion: Converts metric values to imperial values. 

• Actual inverter compressor speed
• Target inverter compressor speed
• Actual superheat
• Target superheat 
• Actual subcooler circuit superheat 
• Target subcooler circuit superheat 
• Main EEV position
• Subcooling EEV position
• Inverter compressor current transducer 

value

• Outdoor air temperature
• Actual high pressure/saturation temperature
• Actual low pressure/saturation temperature
• Suction temperature
• Inverter compressor discharge temperature
• Upper outdoor coil pipe temperature
• Lower outdoor coil pipe temperature
• Liquid line pipe temperature
• Subcooler inlet temperature
• Subcooler outlet temperature
• Four-way reversing valve operation  

indicator light

• Pressure graph 

showing actual 

low pressure and 

actual high  

pressure levels

• Error code display
• Operating mode 

indicator

• Target high  

pressure

• Target low  

pressure

• PCB (printed  

circuit board) 

version

• Software version
• Installer name
• Model number
• Site name
• Total number of connected IDUs
• Communication indicator
• IDU capacity
• IDU operating mode

• IDU fan speed
• IDU EEV position
• IDU room temperature
• IDU inlet pipe temperature
• IDU outlet pipe temperature
• IDU error code

LG MONITORING VIEW (LGMV)  

DIAGNOSTIC SOFTWARE

LGMV software allows the service technician or commissioning agent to connect a computer USB port to the water source unit (WSU) main 

printed circuit board (PCB) using an accessory cable without the need for a separate interface device. The monitoring screen for LGMV  

allows the user to view the following real time data on one screen:

Figure 69: MV Real-time Data Screen.

Figure 70: MV Cycleview.

Note:

Images on these pages are examples of LGMV screenshots. Actual images may differ depending on the version of the software and the units 

installed.

Summary of Contents for ARWN038GA2

Page 1: ...Installation Operation Maintenance Manual ARWN038GA2 ARWN048GA2 ARWN053GA2 Heat Pump 208 230V 60Hz 1 Phase Variable Refrigerant Flow Water Source Units 3 0 4 0 and 4 4 Tons ...

Page 2: ...lure Do not throw away destroy or lose this manual Please read carefully and store in a safe place for future reference Content familiarity required for proper installation A summary list of safety precautions begins on page 4 For more technical materials such as submittals engineering databooks and catalogs visit www lg vrf com For continual product development LG Electronics U S A Inc reserves t...

Page 3: ...ing 40 Water Circuit Installation 41 117 Water Circuit Design 41 42 Piping System Specifications 43 46 Flow Switches and Solenoid Valves 47 48 Variable Water Flow Control Kit 49 56 Electrical System Installation 57 62 General Information 57 Power Wiring 58 Wiring and Cable Terminations 59 Communications Cables 60 62 Pre commissioning and Maintenance 63 78 Preparing the Electrical System 63 Indoor ...

Page 4: ...efrigerant and the ser vice valves closed Do not open service valves on the water source unit until all non condensable have been removed from the piping system and authorization to do so has been obtained from the commissioning agent There is a risk of equipment damage refrigerant contamination refriger ant loss physical injury or death The water source unit is shipped with a refrigerant and serv...

Page 5: ... the product for special purposes such as pre serving foods works of art wine coolers or other precision air conditioning applications The equipment is designed to provide comfort cooling and heating There is risk of property damage Do not make refrigerant substitutions Use R410A only If a different refrigerant is used or air mixes with original refrigerant the unit will malfunction and be damaged...

Page 6: ... required to operate this system Adhere to the NEC code and these instructions when wiring Improper connections and inadequate grounding can cause accidental injury or death Always ground the unit following local state and NEC codes There is risk of fire electric shock and physical injury or death Properly size all circuit breakers or fuses There is risk of fire electric shock explosion physical i...

Page 7: ...d outlet for this product There is risk of fire electric shock physical injury or death Do not operate the disconnect switch with wet hands There is risk of fire electric shock physical injury or death Periodically verify the equipment mounts have not deteriorated If the base collapses the unit could fall and cause property damage product failure physical injury or death Do not touch the refrigera...

Page 8: ...ood Cliffs NJ All rights reserved LG is a registered trademark of LG Corp 038 G A Type N Heat Pump Electrical Ratings G 208 230V 60Hz 1Ø 038 38 200 048 47 800 053 52 900 Condenser W Water Source Family AR Multi V Refrigerant R410A 2 Basic Function A Generation 2 Second Water Source Units WSU AR W N Nominal Capacity Nominal cooling capacity in Btu h UNIT NOMENCLATURE Water Mini Unit ...

Page 9: ... no attenuation and units operating at full load nominal operating condition Measurements are taken 4 9 feet above the finished floor and a distance of 3 3 feet from the face of the fan discharge 3 0 Ton 4 0 Ton 4 4 Ton Model Number ARWN038GA2 ARWN048GA2 ARWN053GA2 Nominal Capacity Input Power Cooling Capacity Btu h 1 38 200 47 800 52 900 Cooling Input Power kW 2 1 2 7 3 2 Heating Capacity Btu h 1...

Page 10: ... S A Inc Englewood Cliffs NJ All rights reserved LG is a registered trademark of LG Corp ARWN038GA2 ARWN048GA2 ARWN053GA2 DIMENSIONS Figure 1 ARWN038GA2 ARWN048GA2 ARWN053GA2 Dimensions H Side View Front View Top View Isometric L7 L L6 L5 L4 L3 L1 L L2 Vapor Line Liquid Line Capped Line Water Outlet Water Inlet Z X Y M1 M2 W D W D H L1 L2 L3 L4 L5 L6 L7 L8 M1 M2 X Y Z ...

Page 11: ...Gas HEX Temp Liquid Temp Suction Temp Hot Gas Bypass Valve 4 Way Valve Main EEV Low Pressure Sensor Accumu lator Inv Comp High Pressure Switch Discharge Temp High Pressure Sensor Check Valve Solenoid Valve Strainer Thermistor Remark High Pressure Switch S High Water In Water Out Plate Heat Exchanger Pressure Sensor SVC Valve Fusible Plug EEV Fusible Plug HighTemperature High Pressure Gas HighTempe...

Page 12: ...g Mode EEV Filter EEV Filter Indoor HEX Indoor Unit Indoor HEX Indoor Unit Fan Fan Liquid Gas HEX Temp Liquid Temp Hot Gas Bypass Valve 4 Way Valve Main EEV Accumu lator Inv Comp High Pressure Switch Discharge Temp High Pressure Sensor High Water In Water Out Plate Heat Exchanger Suction Temp Low Pressure Sensor Fusible Plug Check Valve Solenoid Valve Strainer Thermistor Remark High Pressure Switc...

Page 13: ...Indoor Unit Fan Fan Indoor HEX Indoor HEX EEV EEV Liquid Gas HEX Temp Liquid Temp Suction Temp Hot Gas Bypass Valve 4 Way Valve Main EEV Low Pressure Sensor Accumu lator Inv Comp High Pressure Switch Discharge Temp High Pressure Sensor High Water In Water Out Plate Heat Exchanger Fusible Plug Check Valve Solenoid Valve Strainer Thermistor Remark High Pressure Switch Pressure Sensor SVC Valve Fusib...

Page 14: ...roduct innovation some specifications may change without notification LG Electronics U S A Inc Englewood Cliffs NJ All rights reserved LG is a registered trademark of LG Corp WIRING DIAGRAM 8 3 ARWN038GA2 ARWN048GA2 ARWN053GA2 Figure 5 ARWN038GA2 ARWN048GA2 ARWN053GA2 Wiring Diagram ...

Page 15: ...RBL104 ARBL107 ARBL2010 Vapor pipe Liquid pipe Unit Inch Models ARBLN01621 ARBLN03321 16 1 4 15 3 8 I D 3 4 I D 3 4 I D 3 4 I D 3 4 O D 5 8 I D 1 2 I D 5 8 I D 5 8 I D 5 8 I D 1 2 I D 1 2 I D 1 2 I D 1 2 I D 1 2 I D 1 2 I D 1 2 I D 1 2 11 1 2 11 1 16 11 1 2 11 1 16 2 15 16 2 15 16 2 15 16 2 3 4 2 3 4 2 3 4 I D 5 8 I D 5 8 I D 1 I D 1 O D 1 3 3 16 4 3 8 13 1 16 12 5 8 3 5 16 1 2 3 3 O D 3 4 O D 3 4...

Page 16: ...3 4 I D 5 8 I D 7 8 I D 1 1 8 I D 1 4 3 4 4 3 4 4 3 4 4 3 4 4 3 4 4 3 4 4 3 4 4 3 4 4 3 4 4 3 4 I D 5 8 I D 1 2 I D 5 8 I D 1 2 I D 5 8 I D 3 4 4 3 4 I D 1 4 I D 3 8 I D 3 8 I D 1 2 6 5 16 22 7 8 I D 3 4 I D 5 8 ID15 88 5 8 ID12 7 1 2 I D 5 8 I D 1 2 I D 7 8 I D 1 1 8 I D 1 27 9 16 4 3 4 I D 1 4 I D 3 8 I D 3 8 I D 1 4 I D 3 8 I D 1 2 I D 5 8 I D 1 2 4 3 4 28 3 8 I D 1 4 I D 3 8 I D 3 8 I D 1 4 I ...

Page 17: ... is greater Include enough space in the installation area for service access refer to the installation space requirements The mechanical room floor should be made waterproof Periodic flushing of the water heat exchanger will be required and a floor drain installed nearby the equipment will help facilitate this maintenance The water source unit should be installed with a closed loop water system If...

Page 18: ...uld not carry the product Some products include polypropylene bands around the unit for packaging Do not use polypropylene bands to lift the unit Tear apart and throw away plastic packaging bags so that children may not play with them and risk suffocation and death Lift the water source unit from the base at specified locations Support the water source unit at a minimum of six 6 points to avoid sl...

Page 19: ...r of Water Source Unit Service area Front Figure 7 Required Minimum Space for Water Mini Unit Installation Installation Space When installing the water source unit provide service requirements as illustrated If local code requires additional clearance area comply with local codes INSTALLATION Job site conditions may require routing utilities including the refrigerant piping and electrical wiring u...

Page 20: ...vibration Material Four Bolts Required H Beam Concrete Base 4 Three Threads Note Figure 10 Close up of Anchor Bolts Location of the anchor bolts 13 15 16 15 1 4 Unit Inch Front Figure 9 Location of the Anchor Bolts When building a base support for the water source unit ensure that the floor surface location has enough strength to support the weight of the unit and enough space for pipes and wiring...

Page 21: ...ter of the main and a few branch segments to minimize the possibility of required pipe changes due to field installation variations Adjusting LATS Multi V Output for Altitude When a system is installed at elevations significantly above sea level the designer must also consider the impact air density has on the capacity of the indoor and water source units LATS does not de rate indoor unit capacity...

Page 22: ...otal equivalent piping length 475 7 feet Longest distance from water source unit to indoor unit 230 feet Actual 295 2 feet Equivalent Distance between fittings and indoor units 20 inches Distance between fittings and Y branches 20 inches Distance between two Y branches 20 inches Distance between Header and indoor units 20 inches Minimum distance between indoor unit to any Y branch 3 feet from indo...

Page 23: ...mless phosphorous deoxidized ACR type copper pipe hard drawn rigid type K or L or annealed tempered copper pipe Drawn temper rigid ACR copper tubing is available in sizes 3 8 through 2 1 8 inches ASTM B 280 clean dry and capped Annealed temper soft ACR copper tubing is available in sizes 1 4 through 2 1 8 inches ASTM B 280 clean dry and capped Tube wall thickness should meet local code requirement...

Page 24: ...Y branch Connections Figure 13 Y branch Installation Alignment Specification Vertical up configuration Vertical down configuration Figure 14 Horizontal Configuration End View 5 Horizontal Plane 5 Branch Leg Straight through Leg Y branch Inlet To indoor unit To indoor unit To outdoor unit To next branch To indoor unit Figure 15 Diagram of an Incorrect Y branch Installation LG Y branch and Header ki...

Page 25: ...argest indoor unit to the next port working down to the smallest indoor unit Do not skip ports All indoor units must be mounted at an elevation below the Header fitting All indoor units connected to a single Header fitting should be located with an elevation difference between indoor units that does not exceed 49 feet If indoor units are located at an elevation the same as or above the Header fitt...

Page 26: ...ovided to allow pipe expansion to naturally occur The most common method is the inclusion of expansion Loop or U bends See Figure 20 on page 28 Each segment of pipe has a natural fixed point where no movement occurs This fixed point is located at the center point of the segment assuming the entire pipe is insulated in a similar fashion The natural fixed point of the pipe segment is typically where...

Page 27: ...96 1 20 1 44 1 56 1 68 1 80 1 92 2 04 2 16 2 28 2 40 2 52 2 64 2 59 2 76 3 12 3 36 3 48 3 60 260 1 04 1 04 1 30 1 56 1 69 1 82 1 95 2 08 2 21 2 34 2 47 2 60 2 73 2 86 2 81 2 99 3 38 3 64 3 77 3 90 280 1 12 1 12 1 40 1 68 1 82 1 96 2 10 2 24 2 38 2 52 2 66 2 80 2 94 3 08 3 02 3 22 3 64 3 92 4 06 4 20 300 1 20 1 20 1 50 1 80 1 95 2 10 2 25 2 40 2 55 2 70 2 85 3 00 3 15 3 30 3 24 3 45 3 90 4 20 4 35 ...

Page 28: ...12 14 16 18 20 22 L2 66 77 86 101 115 127 138 2 R1 12 14 16 19 21 23 25 L2 77 89 99 117 133 147 160 2 1 2 R1 14 16 18 21 24 26 29 L2 86 99 111 131 149 165 179 3 R1 15 17 19 23 26 29 31 L2 94 109 122 143 163 180 196 3 1 2 R1 16 19 21 25 28 31 34 L2 102 117 131 155 176 195 212 4 R1 17 20 22 26 30 33 36 L2 109 126 140 166 188 208 226 1 R Centerline Length of Pipe 2 L Centerline Minimum Radius inches ...

Page 29: ... or removable ceiling panels and position the valves to face the access door or ceiling panel opening Mount valves with adequate space between them to allow for placement of adequate pipe insulation around the valves Recommended best practice is to clearly label and document locations of all service valves Y branches and headers Using Elbows Field supplied elbows are allowed as long as they are de...

Page 30: ...ranch Fitting Max 12 12 19 A B A B 12 19 Max 12 Max 12 Max 12 Max 12 Max 12 Figure 26 Pipe Support at Header Fitting A properly installed pipe system will have sufficient supports to avoid pipes from sagging during the life of the system As necessary place supports closer for segments where potential sagging could occur Maximum spacing of pipe supports shall meet local codes If local codes do not ...

Page 31: ...ed Cap D C C C C C C Example Six 6 indoor units connected Water Source Units WSU IDU Indoor Units Header A Main Pipe from Water Source Unit to Header C Header to Indoor Unit D To Farthest Indoor Unit System Using a Header See pages 32 33 for refrigerant pipe diameter and pipe length tables Note See pages 32 33 for refrigerant pipe diameter and pipe length tables Note Indoor units should be install...

Page 32: ... 15 Pipe Capabilities Example Five 5 indoor units connected Water Source Units WSU IDU Indoor Units Y branches Header A Main Pipe from First Y branch B Pipe from Y branch to Y branch or Header C Pipe from Y branch or Header to Indoor Unit D Pipe to Farthest Indoor Unit System Using Y branches and Header Length 230 feet ℓ 131 feet Elevation1 98 4 feet Elevation2 49 feet Water Source Unit Header Fir...

Page 33: ...ource Unit to Y branches Selecting the Refrigerant Piping Figure 28 Selecting Refrigerant Piping Example Five 5 indoor units connected Water Source Units WSU IDU Indoor Units A Main Pipe from Water Source Unit to Y branches B Branch Piping C Branch Piping to Indoor Unit IDU Water Source Unit Capacity Btu h Liquid Pipe Inches O D Gas Pipe Inches O D 37 500 Ø3 8 Ø5 8 49 500 Ø3 8 Ø5 8 54 600 Ø3 8 Ø3 ...

Page 34: ... A Inc Englewood Cliffs NJ All rights reserved LG is a registered trademark of LG Corp Pipe Sizing REFRIGERANT PIPING DESIGN Header First Second First Second First Main Pipe Distribution Second Main Pipe Distribution First Second Third Main Pipe Distribution Various Acceptable Layouts Unacceptable Piping System Layouts A second branch cannot be installed after a header ...

Page 35: ...ate the system until the refrigerant pipe system installation has been completed Never open the valves before a pressure test is performed the system is evacuated a leak test performed and the CommissioningAgent provides authorization to do so Do not use polyolester POE or any other type of mineral oil as a thread lubricant If introduced to the refrigerant circuit will create oil sludge leading to...

Page 36: ...tting One of the main causes of refrigerant leaks is defective flared connections Create flared connections using the procedure below 1 Cut the pipe to length Measure the distance between the indoor unit and the water source unit Cut the pipes a little longer than measured distance 2A Remove the burrs Completely remove all burrs from pipe ends When removing burrs point the end of the copper pipe d...

Page 37: ...gerant Piping System Insulation To prevent heat loss heat gain through the refrigerant piping all refrigerant piping including liquid lines and vapor lines must be insulated separately Insulation must be a minimum 1 2 thick and thickness may need to be increased based on ambient conditions and local codes All refrigerant piping including Y branch and Header connections field provided isolation bal...

Page 38: ...ity level Follow locals codes and the designer s instructions when selecting EPDM insulation wall thickness Classification Piping O D Air conditioned location Non air conditioned location 1 Typical Conditioned Location 2 Special Conditioned Location 3 Typical Unconditioned Location 4 Special Unconditioned Location Liquid pipe ø1 4 inches 1 2 inches 1 2 inches 1 2 inches 1 2 inches ø3 8 inches ø1 2...

Page 39: ...th Header Kit Additional Insulation for Y Branches and Headers May be Required in Humid Environments If the system has been operating for a long time in a high humidity environment dew point temperature more than 73 F condensate is likely to form If this happens install 3 8 inch thick ethylene propylene diene methylene EPDM insulation that is plenum rated with a heat resistance factor of more than...

Page 40: ... test the refrigerant piping system using a multi step process that will assist in locating leaks if any 1 Pressure test the main piping only using field installed Schrader valves and pressure gauges If the test is successful the main lines do not have leaks 150 psi for a period of 5 minutes 300 psi for a period of 15 minutes 550 psi for a period of 24 hours 2 Next pressure test the piping up to a...

Page 41: ...geothermal well while at the low end of the temperature range an auxiliary heat source like a boiler solar panel or geothermal well adds heat Piping pumps and accessories shall be sized to provide adequate water flow to the water cooled unit based on nominal flow rates listed per model number Design Schematic The Multi V Water Mini units have factory installed stainless steel plate heat exchangers...

Page 42: ...ing 50 F and 113 F for cooling When the Multi V Water Mini unit is in cooling mode heat is rejected to the geothermal system When the Multi V Water Mini unit is in heating mode heat is absorbed from the geothermal system Multi V Water Mini units have factory installed stainless steel plate heat exchangers To protect these heat exchangers it is recommended to use closed geothermal water loops Shoul...

Page 43: ...horizontal pipe Wire the flow switch to communication terminals and set to shut off the WSU if flow falls below 50 of WSU design flow The flow switch must be the normally closed type The flow switch must be installed within at least five 5 pipe diameters downstream and at least three 3 pipe diameters upstream of elbows valves or reducers which can cause turbulence and lead to flow switch flutter S...

Page 44: ...w 2 Multiply by the water cooled unit capacity to find the net water cooled unit capacity 3 Apply the corresponding pressure drop correction factor from table below and multiply by the water cooled unit pressure drop to find the net water cooled unit pressure drop Table 23 Antifreeze Correction Factors Piping System Specifications Antifreeze Type Item Antifreeze by Weight 10 20 30 40 50 Methanol C...

Page 45: ...30 Below 30 Reference Item Iron mg Fe ℓ Below 1 0 Below 0 3 Copper mg Cu ℓ Below 1 0 Below 0 1 Sulfate ion mg SO42 ℓ Must not be detected Must not be detected Ammonium ion mg NH4 ℓ Below 0 3 Below 0 1 Residual chlorine mg Cl ℓ Below 0 25 Below 0 3 Free carbon dioxide mg CO2 ℓ Below 0 4 Below 4 0 Stability index 1 The mark for corrosion and scale means that there is a possibility of occurrence Inhi...

Page 46: ... Flow switch should be rated for 208 230V and be a normally closed type Flow switch will perform as the first protection device when heated water is not supplied If the required water level is not pres ent after installing the flow switch the water source unit will display a CH24 error code and will stop operating When setting the flow switch it is recommended to use the default set value of the w...

Page 47: ...it Flow Switches and Solenoid Valve Wiring CN_26 CN_24 CN_22 INTERNET MAIN PCB C_Box DDC BMS Flow Switch Solenoid Valve Water Out Water In CN_26 CN_24 CN_22 MAIN PCB C_Box Flow Switch Solenoid Valve Water Out Water In L1 L2 3 A 3 B 4 A 4 B L1 L2 3 A 3 B 4 A 4 B 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON OFF OFF Figure 50 Water Solenoid Valve Controlled by Water Source Unit Figure 51 Water Solenoid Valve Co...

Page 48: ...an LG representative use the flow rate detection contact to adjust flow rate to within the minimum range Picture 4 Minimum flow rate range of this product is 50 Adjust the flow switch to the contact point when the flow rate reaches 50 Minimum flow rate range is 50 Reference flow rate 3 ton 10 6 gpm 4 ton 13 2 gpm 4 4 ton 15 9 gpm If the product operates while the flow switch contact point is out o...

Page 49: ...ser water systems The control board transformer and wiring provide connections to a field supplied modulating water valve Variable Water Flow Control Kit Parts included Cable Assembly Terminal Block Assembly Variable Water Flow Control PCB Transformer Screws Variable Water Flow Control Kit PCB 1 CN_PWR Power input terminal DC 12V 2 CN_AO Signal output terminal to control a water flow control valve...

Page 50: ...cable DC 0 10V of the water flow control valve to CN_AO AO_01 A GND A of the VWFC 10 Case of two water flow control valve Connect a signal cable DC 0 10V of water flow control valve to CN_AO AO_02 B GND B of VWFC 11 Connect a power cable AC 24V of the water flow control valve to the terminal block two pin yellow terminal block max current 0 42A 12 Connect the RS 485 communication cable to CN_COMM ...

Page 51: ...without notification LG Electronics U S A Inc Englewood Cliffs NJ All rights reserved LG is a registered trademark of LG Corp WATER CIRCUIT INSTALLATION Variable Water Flow Control Kit Variable Water Flow Control Kit Wiring Diagram Water Mini Unit Main PCB Figure 54 Variable Water Flow Control Kit Wiring Diagram ...

Page 52: ... Corp Water source Unit PCB DC12V or DC15V GND Power Source DC12V GND WATER CIRCUIT INSTALLATION Variable Water Flow Control Kit Variable Water Flow Control Kit Power Source Input When wiring the power source from the water source unit When wiring an external power source The Variable Water Flow Control Kit can accept only DC power input Do not use 220VAC power input as it will damage the unit The...

Page 53: ...ered trademark of LG Corp WATER CIRCUIT INSTALLATION Variable Water Flow Control Kit Wiring for the Variable Water Flow Control Kit Power Source PCB and Transformer PCB and transformer can accept only DC 12V power input Do not use AC power input as it will damage the unit AWG 23 wiring is recommended for the power DC 12V line Figure 55 Variable Water Flow Control Kit Power Source PCB and Transform...

Page 54: ...er Flow Control Kit Valve The Variable Water Flow Control Kit can control a maximum of two valves If only one valve is present then the slave signal connector must not be used AWG 23 wiring is recommended for the power AC 12V line and signal DC 0 10V line AC 24V Power Source for Variable Water Flow Valve DC 0 10V Control Signal for Variable Water Flow Valve Master Slave Figure 56 Variable Water Fl...

Page 55: ...PCB voltage signal Minimum flow rate recommended 40 of rated flow rate if the flow rate is lower it will damage the water source unit ON L1 2 3 4 OFF Default is L1 ON L2 OFF Table 25 Output Signal Setting DIP Switch Setting Function Control signal DC 0V OFF DC 8 10V ON Control signal DC 0V OFF DC 6 10V ON Control signal DC 0V OFF DC 4 10V ON Default status Control signal DC 0V OFF DC 2 10V ON DIP ...

Page 56: ...he reset switch must be pressed to reflect the setting Before operating the water source unit check the water flow rate and the PCB voltage signal Minimum flow rate recommended 40 of rated flow rate if the flow rate is lower it will damage the water source unit ON SW01B SW02B 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 OFF OFF DIP Switch Setting Function Variable Water Flow Control Mode 1 2 3 4 5 6 7 ON 1 2 3 ...

Page 57: ...cables together Do not run the power wiring and the communication cable in the same conduit Note Access Hole for Main Power Wiring Access Hole for Communication Cable Separating Power Wires and Communication Cables General Information All power wiring and communication cable installation must be performed by authorized service providers working in accordance with local state and NEC regulations re...

Page 58: ...aker or Fused Disconnect Switch ELECTRICAL SYSTEM INSTALLATION Power Wiring Figure 59 Schematic of Suggested Power Wiring Copper Wire Terminate multiple power wires of the same gauge to both sides Do not terminate two wires on one side Do not terminate different gauge wires to a terminal block Ring Terminal Power Wiring Connecting the Power Wiring Best practice dictates using ring or spade termina...

Page 59: ...minal block of control case using clamps on the supporter and control case as shown in Figure 62 2 Connect communication wire to main PCB terminal block using clamps on the supporter and main PCB case as shown in Figure 62 Never apply line voltage power to the communications cable terminal block If contact is made the PCBs may be damaged Always include some allowance in the wiring length when term...

Page 60: ...lva nized or nickle plate over steel Always verify the communication cable is connected to a communications terminal on the water source unit Never apply line voltage power to the communication cable connection If contact is made the PCBs may be damaged The shield of the communications cable connecting the water source unit to the indoor units should be grounded only to the water source unit frame...

Page 61: ... provided to connect the water source unit to central control devices Communications Cables ELECTRICAL SYSTEM INSTALLATION Field Provided 18 Gauge Stranded Two core Cable Shielded Insulation material as recommended by local code Communication Cables Between the Water Source Unit and the Central Control Device Field Provided 18 Gauge Stranded Two core Cable Shielded Insulation material as recommend...

Page 62: ... group control cable kit for each indoor unit in the group except for the last indoor unit Always use an LG provided group control communications cable Group Control Kit sold separately between the indoor unit and the wall mounted zone controller NEVER splice cut or extend cable length with field provided cable Before running cable decide which indoor unit will be the Master The zone controller wi...

Page 63: ...del code 2 Total capacity in horsepower 3 2 Heat pump model 4 25 Normal mode display If the DIP switch is not set correctly this number is not displayed 5 136 Model type Water Mini Model Code Capacity Horsepower Tons Power Supply Refrigerant 120 4 3 0 1Ø 208 230V R410A 121 5 4 0 122 6 4 4 Table 29 Code Display Sequence Table 30 Water Mini Unit Model Identification Codes During the pre commissionin...

Page 64: ...nds Release when 88 appears on the LED After three 3 to seven 7 minutes the display will flash a number for about ten 10 seconds indicating how many indoor units the system successfully communicated with 10 This number should match the known installed number of indoor units if the auto addressing procedure was successful 11 Upon completion of the auto addressing routine the display will be blank a...

Page 65: ...ress number of each indoor unit is shown on the wired remote controller display or on the indoor unit display The address number will disappear after pressing the on off button on the remote controller If 01 02 08 is seen that means that eight 8 indoor units have been successfully auto addressed Initiate auto addressing procedure Wait 45 seconds Power On Press hold the red Auto Address Button for ...

Page 66: ...D After three 3 to seven 7 minutes the display will flash a number for about ten 10 seconds indicating how many indoor units the system successfully communicated with 5 This number should match the known installed number of indoor units if the auto addressing procedure was successful 6 Upon completion of the auto addressing routine the display will be blank and the system will be in standby waitin...

Page 67: ...and the Slave identity assignment to each indoor unit in the group on the Pre commissioning Device Configuration Worksheet 3 Termination Procedure Starting with the Master unit plug in the male end of the pigtail cable into the CN REMO socket At the last Slave indoor unit in the group a pigtail cable is not required Plug the male end of the extension cable coming from the previous indoor unit into...

Page 68: ...h type of Central Controller device is designed to communicate with a limited quantity of indoor units The quantity of indoor units that can be connected to a single central control communications cable therefore will be defined by the central control device on that cable with the smallest Maximum Indoor Unit Quantity as shown at right Central Controller Communications Limitations Group Number If ...

Page 69: ...tup function 02 icons are different for each controller Refer to the controller user s manual for more information Type in the Central Control address designated for the Master indoor unit 7 Disable power to the Master indoor unit Do not restore Power to the Master indoor unit at this time It shall be restored in step 18 8 If the zone controller and associated communications cable has already been...

Page 70: ... that is farthest from set point Indoor Unit Temperature Sensing Strategy Air Balance Conduct an Air Balance for Ducted Indoor Units For each ducted model indoor unit confirm that the Test and Balance contractor adjusted the fan speed setting values Recorded the actual fan setting value used to deliver cataloged CFMs at the jobsite static pressure conditions in the appropriate column on the Pre Co...

Page 71: ...arging port on the water source unit 5 Check the vacuum pump s you intend to use and verify the oil in the sump is fresh and not contaminated 6 Attach the vacuum pump s to each charging port simultaneously using high quality refrigerant vacuum hoses 7 Perform a triple evacuation 8 Achieve a micron gauge reading of less than 500 microns 9 At 500 microns valve off the charging port by closing the co...

Page 72: ...k all auto or manual air valves installed Balance the Water Circuit Flow Distribution The water flow balancing contractor must complete their work prior to commissioning and verifying the water flow rate is within project specifications Excessive or restricted water flow may impact the ability of the Commissioning Agent to successfully complete system com missioning It is best if the water flow ba...

Page 73: ... s fan speed i e fan setting value set by the Test and Balance technician to deliver cataloged air volume CFM at jobsite static pressure conditions Initiate a Request for a System Commissioning Contact your LG Applied Representative s Project Manager or your account representative and request a System Commissioning Provide all the documents listed in Prepare Pre commissioning Package section above...

Page 74: ...de 5 diluted formic acid citric acid oxalic acid acetate acid phosphoric acid Make sure the cleaning solution used does not include chemicals such as hydrochloric acid sulfuric acid nitric acid or calcium chloride that are cor rosive to 316 stainless steel or ACR copper Isolate the unit from the pipe system by closing the inlet outlet ball valves and the drain pipe valve Connect a hose to the serv...

Page 75: ...Below 50 Below 50 Ionic static silica mg SiO2 ℓ Below 30 Below 30 Reference Item Iron mg Fe ℓ Below 1 0 Below 0 3 Copper mg Cu ℓ Below 1 0 Below 0 1 Sulfate ion mg SO42 ℓ Must not be detected Must not be detected Ammonium ion mg NH4 ℓ Below 0 3 Below 0 1 Residual chlorine mg Cl ℓ Below 0 25 Below 0 3 Free carbon dioxide mg CO2 ℓ Below 0 4 Below 4 0 Stability index 1 The mark for corrosion and scal...

Page 76: ...emical detergent as recommended by the chemical supplier Note that cleaning the heat exchanger is easier at the initial stages and becomes difficult after scaling has accumulated In areas where the water quality is poor cleaning is required more often Because chemical detergent has a strong acid content the system must be flushed thoroughly with water after cleaning To verify the system has been p...

Page 77: ... temperature Suction temperature Inverter compressor discharge temperature Upper outdoor coil pipe temperature Lower outdoor coil pipe temperature Liquid line pipe temperature Subcooler inlet temperature Subcooler outlet temperature Four way reversing valve operation indicator light Pressure graph showing actual low pressure and actual high pressure levels Error code display Operating mode indicat...

Page 78: ... use of a USB to RS 485 connector kit When connected through IDU user will not be able to record data This software can be used to both commission new systems and troubleshoot existing systems LGMV data can be recorded to a CSV file and emailed to an LG representative to assist with diagnostic evaluations Recommended Minimum PC Configuration LG MONITORING VIEW LGMV DIAGNOSTIC SOFTWARE Error Codes ...

Page 79: ...temperature sensor error Indoor unit outlet pipe temperature sensor has disconnected or short circuited Check the connection at the CN PIPE OUT socket on the indoor unit PCB then check the thermistor 0 7 Indoor units are not operating in the same mode Different operation mode between indoor units 0 9 Indoor unit EPROM error Communication error between the indoor unit PCB board and its option card ...

Page 80: ...B Thermistor has disconnected or short circuited 4 2 1 Water source unit low pressure transducer error Check the connection at the CN 32 socket on the water source PCB Transducer has disconnected or short circuited 4 3 1 Water source unit high pressure transducer error Check the connection at the CN 30 socket on the water source PCB Transducer has disconnected or short circuited 4 4 1 Water source...

Page 81: ... with the arrow on the socket 1 1 3 1 Water source unit liquid pipe temperature sensor SC_L error Check the connection at the CN 33 socket on the water source PCB Thermistor has disconnected or short circuited 1 5 1 1 Water source unit four way reversing valve switch 4WAY_1 error Check the connection at the CN 09 socket on the water source PCB Thermistor has disconnected or short circuited 1 8 1 1...

Page 82: ...m Installation Manual Due to our policy of continuous product innovation some specifications may change without notification LG Electronics U S A Inc Englewood Cliffs NJ All rights reserved LG is a registered trademark of LG Corp ...

Page 83: ...tem ID Page Mech Contractor Company Name MEP Project Mngr Name Pre Com Tech Name Ph email Ph Email IDU s Unit Tag Building Floor Room ID Type Model Serial System Address Central Control Address Group member ID or N A if not in a group Group Function M Master S Slave Sensor Strategy RA ZC Both Adjusted Fan Setting Value Low Medium High ...

Page 84: ... V PIPING TREE DIAGRAM Installer must receive change authorization from the design engineer because any change made requires the review of the entire tree diagram and verification that the change did not impact the size of piping segments in other parts of the system All pipe materials were properly stored capped and clean All burrs were removed after cutting and pipe ends were reamed before brazi...

Page 85: ...wer wiring was connected to a single phase 208 230V source Ground wire was installed and properly terminated at the water source unit The power supplied was clean with voltage fluctuations within specifications 10 of nameplate Power wiring to the water source unit s was installed per all local electrical code requirements Power wiring to each indoor unit was installed per all local electrical code...

Page 86: ...cuation has been performed Micron gauge reading held at a minimum of 500 for 24 hours with all isolation valves open and without the vacuum pump connected Power was energized to the water source unit at ______________ time on __________day to power the compressor crankcase heater s Must be at least 6 hours before commissioning The communications cable to the indoor units has been disconnected from...

Page 87: ...udes all changes noted by the pipe fitter s in Number 2 The tree diagram notes should include changes to the line lengths used for each liquid line segment 4 A copy of a completed and verified Installation Checklist for the water source unit indoor units ERVs Air Cleaners and Con trol Devices Correct any procedures needing attention before initiating a request for commissioning 5 A copy of the air...

Page 88: ...PRE COMMISSIONING CHECKLIST Page 3 Notes for the Commissioning Agent ...

Page 89: ...PRE COMMISSIONING CHECKLIST Page 4 Notes for the Commissioning Agent ...

Page 90: ... 15k to 42k 0 97 22 High Static Ducted BR 48k to 54k 1 37 23 High Static Ducted B8 76k to 95k 2 20 24 Low Static Ducted Low Static Ducted Bottom Return B1 B3 7k to 15k 0 37 25 Low Static Ducted Low Static Ducted Bottom Return B2 B4 18k to 24k 0 82 26 Vertical Horizontal Air Handling Unit NJ 12k to 24k 1 04 27 Vertical Horizontal Air Handling Unit NJ 30k 1 04 28 Vertical Horizontal Air Handling Uni...

Page 91: ...For further technical materials such as submittals engineering manuals service manuals and catalogs visit www lg vrf com ...

Page 92: ...way Alpharetta Georgia 30022 www lg vrf com IM_MultiVWaterMini_5_16 Supersedes VRF IM BM 001 US 013L26 VRF IM BM 001 US 013H09 LG Customer Information Center Commercial Products 1 888 865 3026 USA Follow the prompts for commercial A C products 20001747 ISO 9001 2008 LG ELECTRONICS INC ...

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