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49

Electrical System Installation

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.

ELECTRICAL

Communication Cable Specifications

Communications Cable Specifications from RTUs to Remote Controllers

• Communication cable from RTU to Remote Controller(s) is to be LG supplied or field supplied 22 AWG, 3-conductor, twisted, stranded, 

unshielded. Wiring must comply with all applicable local and national codes. 

• If using LG supplied cable and the length needs to be extended, the LG Extension Kit (sold separately) must be used. A maximum of four 

(4) kits (up to 165 feet) can be used.

• Remote Controllers have hardwired connections: SIG - 12V - GND (Comm.) terminals.
• See diagrams below for two options: terminal block connections and Molex connections. Refer to the wiring diagram schematic found in the 

RTU itself, or to the wiring diagram in this Manual.

• 

NEVER splice, cut, or extend cable length with field provided cable. Always include enough cable to cover distance between the RTU 

and the remote controller.

• Set the RTU operating parameters using DIP switches, or by setting up the remote controller. Refer to the remote controller installation 

manuals for more details.

Cable connected to Zone Controller is the factory default connection.

Figure 35: One Example of RTU to Zone Controller Connection.

BACnet-

BACnet Common

Not used

Not used

Not used

Common

4 5 6

13 14 15

Split Rooftop Unit

Signal

12VDC

YL

RD

BK

CN-REMO

R D

B K

Y L

Front

CN-REMO

R D B K

Y L

Back

Split Rooftop Unit

Figure 36: Another Example of RTU to Zone Controller Connection.

Summary of Contents for ARNU363DDA4

Page 1: ...Models ARNU363DDA4 ARNU483DDA4 ARNU603DDA4 ARNU723DDA4 36 000 to 72 000 Btu h SPLIT ROOFTOP UNIT INSTALLATION MANUAL ...

Page 2: ...reference Content familiarity is required for proper installation The instructions included in this manual must be followed to prevent product malfunction property damage injury or death to the user or other people Incorrect operation due to ignoring any instructions will cause harm or damage The level of seriousness is classified by the symbols described by the summary list of safety precautions ...

Page 3: ...n 9 10 Split Rooftop Unit Product Overview 11 17 General Data 11 Electrical Data 12 Interior Components 13 Control Box Components 14 Dimensions 15 Refrigerant Flow Diagram 16 17 Split Rooftop Unit Installation Guidelines 18 26 Refrigerant Safety 27 General Refrigerant Piping System 28 29 Refrigerant Piping 30 33 Duct Connections 34 35 Roof Ductwork Configuration 36 Piping Connections 37 Condensate...

Page 4: ... all control box and panel covers If cover panels are not securely installed dust water and animals will enter the outdoor unit causing fire electric shock and physical injury or death Always check for system refrigerant leaks after the unit has been installed or serviced Exposure to high concentration levels of refrigerant gas will lead to illness or death Periodically check that the outdoor fram...

Page 5: ...t is used or air mixes with original refrigerant the unit will malfunction and damage will occur Do not store or use flammable gas combustibles near the unit There is a risk of product failure Do not use the product for mission critical or special pur pose applications such as preserving foods works of art or other precision air conditioning applications The equipment is designed to provide comfor...

Page 6: ...s with appropriate wire strain relief Improperly securing wires will create undue stress on equipment power connections Inadequate connections will generate heat cause a fire and physical injury or death Ensure the system is connected to a dedicated power source that provides adequate power If the power source capacity is inadequate or the electric work is not performed properly it will result in ...

Page 7: ... caution when cleaning or servicing the air conditioner There is risk of electric shock physical injury or death Clean up the site after servicing is finished and check that no metal scraps screws or bits of wiring have been left inside or surrounding the unit Do not use the product for mission critical or special pur pose applications such as preserving food works of art or other precision air co...

Page 8: ...ewood Cliffs NJ All rights reserved LG is a registered trademark of LG Corp UNIT NOMENCLATURE ARN U 36 3 DD A Generation 4 Fourth Electrical Ratings 3 208 230V 60Hz 1Phase 36 36 000 Btu h 48 48 000 Btu h 60 60 000 Btu h 72 72 000 Btu h Type U DC Inverter Heat Pump Family ARN Multi V Indoor Unit Refrigerant R410A DD Split Rooftop Unit Series A First Series Cooling Capacity Model 4 ...

Page 9: ... the required construction mechanical electrical and or other disciplines Applicable Codes Personnel must be familiar with and follow the applicable national state and or local codes Installation work must be performed by trained personnel and in ac cordance with national wiring standards and all local or other applicable codes Improper installation can result in fire electric shock physical injur...

Page 10: ...p Required Tools field provided Level JIS screwdriver Electrical lineman pliers Electric drill Holesaw Drill R410A flaring tool set Tubing cutter Tube pipe reamer Refrigerant gas leak detector Thermometer Required Parts field provided Pipes vapor line and liquid line with insulation 3 8 or 1 2 nuts flat washers and lock split washers 3 8 or 1 2 threaded hanger rods Insulated drain hose Additional ...

Page 11: ...outdoor unit only Do not ground the ODU IDU communication cable at any other point Model No ARNU363DDA4 ARNU483DDA4 ARNU603DDA4 ARNU723DDA4 Cooling Mode Performance Capacity Btu h 36 000 48 000 60 000 72 000 Max Power Input1 W 640 700 760 770 L M H Power Input at Factory Default W 110 130 150 120 150 260 130 250 330 140 260 350 Heating Mode Performance Capacity Btu h 38 000 52 000 71 000 80 000 Ma...

Page 12: ...e suitable for use on an electrical system where voltage supplied to unit terminals is within the listed range limits Select wire size based on the larger MCA value Instead of fuse use the circuit breaker 1 Max power input is rated at maximum setting value Model Voltage Range MCA MOP Rated Amps A Power Supply Power Input1 W Hz Volts Phase Max Cooling Max Heating L M H at Factory Default ARNU723DDA...

Page 13: ... Electronics U S A Inc Englewood Cliffs NJ All rights reserved LG is a registered trademark of LG Corp Interior Components PRODUCT OVERVIEW Figure 2 RTU Components Heat Exchanger Heat Recovery Unit Supply Fan Supply Outlet Bottom Filter MERV 8 13 Economizer Optional Return Inlet Bottom Return Inlet Side Supply Outlet Side ...

Page 14: ...wood Cliffs NJ All rights reserved LG is a registered trademark of LG Corp PRODUCT OVERVIEW Control Box Components Main PCB SUB PCB HR UNIT SUB PCB Main PCB Transformer 208 230V 24V T B Economizer T B Motor T B Communication Remote T B Main Power Economizer Honey Well T B DO Digital Output Relay PCB Dry Contact 208 230V 24V HR UNIT PCB Figure 3 Control box in the Split Rooftop Unit ...

Page 15: ... 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 External Dimensions Figure 4 ARNU363 723DDA4 Dimensions PRODUCT OVERVIEW ...

Page 16: ...tinuous 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 Refrigerant Flow Diagram Figure 5 ARNU363 723DDA4 Refrigerant Flow Diagram PRODUCT OVERVIEW ...

Page 17: ...efrigerant Flow Diagram Table 3 ARNU363 723DDA4 Refrigerant Pipe Connection Port Diameters Model Liquid inch High Pressure Vapor inch Low Pressure Vapor inch ARNU723DDA4 3 8 Brazed 5 8 Brazed 3 4 Brazed ARNU603DDA4 ARNU483DDA4 1 2 Brazed 5 8 Brazed ARNU363DDA4 Thermistor Description TH1 Return air thermistor TH2 HR Pipe out thermistor TH3 HR Pipe in thermistor TH4 HR liquid TH5 Pipe in thermistor ...

Page 18: ... than 60 of the total capacity of all indoor units Failure to comply with the above connection conditions for installation can cause reduced heating cooling performance Sample Layouts Combination Ratio Examples Split RTU 6 0 Ton Outdoor Unit 20 0 Ton Split RTU 6 0 Ton Indoor Unit 4 0 Ton Indoor Unit 4 0 Ton Combination Ratio Split RTU 6 0 Ton Outdoor Unit 20 0 Ton Split RTU 6 0 Ton Indoor Unit 4 0...

Page 19: ...ace for drainage to ensure condensate flows properly out of the unit when it is in cooling mode Avoid placing the unit in a low lying area where water could accumulate Use a level indicator to ensure the unit is installed on a level plane Don ts Where it will be subjected to direct thermal radiation from other heat sources or an area that would expose the outdoor unit to heat or steam like dischar...

Page 20: ...ing delivery Alert the carrier if any damage is detected Do not refuse shipment The customer must make notation of damage or shortage of items on the delivery receipt and all copies of the bill of lading which should be countersigned by the delivering carrier If damaged immediately contact your manufacturer s representative Any physical damage to the unit after acceptance is not the responsibility...

Page 21: ...allow cold parts to reach room temperature Leave coverings loose to permit air circulation and to allow for periodic inspection The unit must be stored at least 3 in 89 mm off the floor Clearance must be provided to permit air circulation and space for inspection Outdoor The unit must be placed on a level surface to prevent water from leaking into the unit The unit should be elevated so that it is ...

Page 22: ...are equipped with a plenum fan for Supply Air Coils Evaporator coil Filters 2 inch thick pleated paper MERV 8 standard or MERV 13 filters in the supply air stream Split DX system Unit ordered with either Multi V 5 outdoor unit or Multi V S outdoor unit Airflow Arrangement The unit is capable of Constant Air volume CAV with two different mode One is Air Volume CFM Control which follow automatically ...

Page 23: ...ause severe personal injury and property damage Use all lifting points Improper lifting can cause property damage severe personal injury or death Lifting points may not be symmetrical to the center of gravity of the unit Ballast or unequal cable lengths may be required Before lifting be sure that all shipping materials have been removed from unit To assist in determining rigging requirements see t...

Page 24: ...d unit level to allow the condensate drain to flow properly and allow service access doors to open and close without binding Roof curb details including duct locations and dimensions are to be found in the roof curb assembly instructions The recommended nominal curb height is at least 14 inches 1 Install curb Locate curb over roof opening and fasten in place Check that the diagonal dimensions are ...

Page 25: ...ld run the width of the unit and extend beyond the unit a minimum of 12 inches on each side Set unit on rails See Figure below for example of a typical RTU installed on rails supplied by others Figure 13 RTU Installed on Rails Ensure that the rails are designed to handle the weight of the unit If the rails don t have sufficient strength the unit will fall and cause physical injury or death Ensure ...

Page 26: ...hes 150 mm beyond unit cabinet INSTALLATION GUIDELINES Figure 14 RTU Installed on Pad Ensure that the pad is designed to handle the weight of the unit If the pad doesn t have sufficient strength the unit will fall and cause phys ical injury or death Ensure that the chosen location has enough strength to support the weight of the unit s If it does not have sufficient strength the unit s will fall a...

Page 27: ...local state and federal codes for the 551 psi design pressure of R410A Inadequate piping may fail when pressurized REFRIGERANT SAFETY Verify that the maximum refrigerant concentration in the space where the unit will be mounted meets the concentration limit allowed by ASHRAE Standards 15 2010 and 34 2010 There is danger of asphyxiation from oxygen displacement ASHRAE Standards 15 2010 and 34 2010 ...

Page 28: ...adation Poor insulation of the compressor System does not operate properly Solutions Remove moisture from the piping Piping ends should remain capped until connections are complete Do not install piping on a rainy day Connect piping properly at the unit s side Remove caps only after the piping is cut the burrs are removed and after passing the piping through the walls Evacuate system to a minimum ...

Page 29: ...material is not used oxidized film will accumulate and clog or damage the compressors Flux can harm the copper piping or refrigerant oil 6 Use a tubing cutter do not use a saw to cut pipe De bur and clean all cuts before assembly 7 Brazing joints Use a dry nitrogen purge operating at a minimum pressure of three 3 psig and maintain a steady flow Use a 15 silver phosphorous copper brazing alloy to a...

Page 30: ... and flexible pipe connection kits provided by LG Glue all insulation joints with no air gaps between insulation segments and between insulation segments and the unit case Ensure insulation material fits snugly against the refrigeration pipe with no air space between the pipe surface and the surrounding insulation Protect insulation inside hangers and supports with a second insulation layer Ensure...

Page 31: ...tilated area and the system develops a refrigerant leak it will cause a fire electric shock explosion physical injury or death Selecting Field Supplied Copper Piping Always follow local codes when selecting and installing copper pipe and piping system components Approved piping for use with Multi V products will be marked R410 RATED along the length of the pipe Piping wall thickness must meet loca...

Page 32: ...imitations Pipe Length ELF Equivalent Length of pipe in Feet Longest total equivalent piping length 3 280 feet Longest distance from outdoor unit to RTU 656 feet Actual 738 feet Equivalent Distance between fittings and RTU 20 inches Distance between fittings and Y branches 20 inches Distance between two Y branches 20 inches Minimum distance between RTU to any Y branch 3 feet from RTU to Y branch M...

Page 33: ...DU RTU Liquid pipe O D Low Pressure pipe O D High Pressure pipe O D 10 119 7 1 2 in No Increase No Increase 12 144 14 168 5 8 in 16 18 192 206 20 233 1 22 28 264 336 7 8 in 30 42 360 504 Table 9 Main Pipe A Diameters Downstream RTU Capacity kBtu h Liquid pipe O D Low Pressure pipe O D High Pressure pipe O D 114 700 3 8 in 7 8 in 3 4 in 172 000 1 2 in 1 1 8 in 7 8 in 229 400 5 8 in 248 500 1 3 8 in...

Page 34: ... duct openings Seals around duct openings must be tight General Guidelines To prevent air leaks seal all ducts following local codes Installation of all ducts must be done in accordance with SMACNA and AMCA guidelines Duct adapters are provided along with the RTU to support ducts Figure 18 Split Rooftop Units Horizontal and Vertical positions Vertical Discharge 10 9 inch 13 0 inch 12 6 inch 25 7 i...

Page 35: ...LG Electronics U S A Inc Englewood Cliffs NJ All rights reserved LG is a registered trademark of LG Corp Figure 20 Split Rooftop Unit Duct Connections 46 7 in 38 9 in Field service panel 76 7 Inch HR unit pipe hole Control box access panel Horizontal duct access Vertical duct access Drain pipe hole Economizer option DUCT CONNECTIONS ...

Page 36: ...d the building ducts Duct connections to collar type openings can be made with S cleats or overlapping joints Apply caulk around each duct connection Failure to seal duct connections can cause air leakage and system performance problems A straight duct for a distance of three 3 to six 6 duct diameters from the unit discharge should be used to develop a full dynamic head Branching and turning close...

Page 37: ...minal Tons Model Name Liquid Line High Pressure Gas Line Low Pressure Gas Line Dia in Connection A in B in Dia in Connection A in B in Dia in Connection A in B in 6 ARUN723DDA4 3 8 Brazed 5 1 32 17 1 8 5 8 Brazed 5 1 32 19 7 8 3 4 Brazed 5 1 32 23 7 32 5 ARUN603DDA4 3 8 Brazed 5 1 32 17 1 8 5 8 Brazed 5 1 32 19 7 8 3 4 Brazed 5 1 32 23 7 32 4 ARUN483DDA4 3 8 Brazed 5 1 32 17 1 8 1 2 Brazed 5 1 32 ...

Page 38: ...n cause an un trapped drain to back up due to the air being pulled up through the condensate drain piping The value of pressure in the drain pipe should be at least equal to the absolute value of the negative static pressure in the drain pan plus one inch The Split Rooftop Unit has one inch condensate drain connection on end of condensate pan The piping for the condensate drain and external trap c...

Page 39: ...ame Gravity Drain Drain Pipe Dia OD in Connection A B ARUN363DDA4 1 Plain 24 1 4 4 19 32 ARUN483DDA4 1 Plain 24 1 4 4 19 32 ARUN603DDA4 1 Plain 24 1 4 4 19 32 ARUN723DDA4 1 Plain 24 1 4 4 19 32 Table 12 Split RTU Condensate drain location and sizes Condensate Drain Connection Location and Sizes Figure 25 Split Rooftop Unit Condensate drain location Figure 26 Split Rooftop Unit Condensate drain loc...

Page 40: ...s related to electrical equipment and wiring and following the instructions in this manual Generated overcurrent could include some amount of direct current Using an oversized breaker or fuse will result in electric shock physical injury or death Do not connect ground wire to refrigerant gas or water piping to lightning rods to telephone ground wiring or to the building plumb ing system Failure to...

Page 41: ...t some distortion the space between the power wiring and communication cable must be in creased Table 13 Power Wire and Communications Cable Minimum Required Separation Allowable Distances Separating Power Wiring and Communication Cables Avoid running the power wiring and communication cable alongside each other there is a strong likelihood of operation malfunction due to electrostatic and electro...

Page 42: ...terminal block Use an appropriately sized screwdriver for tightening the terminals Do not overtighten the connections overtightening will damage the terminals If ring terminals or fork terminals are not available then Do not terminate different gauge wires to the power terminal block Slack in the wiring will generate heat When terminating wires of the same thickness follow the instructions demonst...

Page 43: ...eath Install appropriately sized breakers fuses overcurrent protection switches and wiring in accordance with local state and NEC regulations related to electrical equipment and wiring and following the instructions in this manual Generated overcurrent will include some amount of direct current Using an oversized breaker or fuse will result in electric shock physical injury or death Use the approp...

Page 44: ...eat recovery units A B Refer to the wiring diagram schematic found in the indoor unit itself or to the indoor unit wiring diagrams in the Engineering Manuals for more information Match IDU A and B terminals on outdoor unit to A 3 and B 4 terminals on indoor units heat recovery units Insulation as required by NEC and local codes Rated for continuous exposure of temperatures up to 140 F Maximum allo...

Page 45: ...ce procedures 4 Provide at least three 3 to four 4 inches of slack cable at each RTU 5 Secure the communications cable to the inside surface of the control box using a field provided nylon wire clamp 6 Strip approximately quarter of an inch of insulation from each communications cable conductor At each RTU insert the conductors under the terminal screw 7 Securely tighten the terminal screws to pre...

Page 46: ...re three penetrations into the cabinet that are required Figure 32 Electrical Entry in the Split Rooftop Units ELECTRICAL Control Box Wiring Connections It is recommended by the Manufacturer that electrical service be brought into the unit through the end wall as shown below There are three penetrations into the cabinet that are required See Figure below Figure 33 Control box in the Split Rooftop ...

Page 47: ...rollers or other central controllers or LG building management system gateways to the RTU outdoor unit com munications cable Connection Procedure RTU installation best practices are to connect control wiring low voltage and then connect power wiring high voltage Do not apply power to the RTU or any Multi V system component until authorized to do so by the system commissioning agent 1 Ensure the in...

Page 48: ...me 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 Figure 34 Main Outdoor Unit to RTU Communication Wiring Typical Daisy Chain Configuration Example ELECTRICAL Typical Daisy Chain Configuration Example ...

Page 49: ...llers have hardwired connections SIG 12V GND Comm terminals See diagrams below for two options terminal block connections and Molex connections Refer to the wiring diagram schematic found in the RTU itself or to the wiring diagram in this Manual NEVER splice cut or extend cable length with field provided cable Always include enough cable to cover distance between the RTU and the remote controller ...

Page 50: ...tings and connect the group control wiring after the system auto address and auto pipe procedures have been completed For RTUs with hardwired connections SIG 12V GND Comm terminals From the controller to the main RTU use 22 AWG 3 conductor twisted stranded unshielded All wiring must comply with all applicable local and national codes From the main RTU to the sub RTU s daisy chain using 22 AWG 3 co...

Page 51: ...t performance with LGRED heat technology is included in Multi V 5 air source units produced after February 2019 PRHR 3 Heat Recovery Units The PRHR 3A series of heat recovery units were released in June 2018 and are not automatically backwards compatible with all LG man ufactured VRF air water source units The 3A heat recovery units will be compatible with many LG manufactured air source water sou...

Page 52: ...9 Proper Location for the Wired Controller Wall Mounted Sensor Installation Proper indoor unit operation depends on the location of the room sensor if a room sensor is installed in addition to or to use in place of a controller A good location will protect the sensor from direct sunlight and external local sources of water vapor and air flow If no mounting height was specified by the building desi...

Page 53: ...tions may change without notification LG Electronics U S A Inc Englewood Cliffs NJ All rights reserved LG is a registered trademark of LG Corp Figure 40 ARNU363 723DDA4 Wiring Diagram Dry Contact PDRYCB400 Electrical Wiring Diagram ELECTRICAL Electrical Wiring Diagram when using Dry Contact PDRYCB400 ...

Page 54: ...pecifications may change without notification LG Electronics U S A Inc Englewood Cliffs NJ All rights reserved LG is a registered trademark of LG Corp Electrical Wiring Diagram ELECTRICAL Electrical Wiring Diagram when using Dry Contact PDRYCB320 Figure 41 ARNU363 723DDA4 Wiring Diagram Dry Contact PDRYCB320 ...

Page 55: ...r Dry Contact it is always Auto mode SW5 CONTINUOUS FAN Off On Selects continuous fan for split rooftop units 1 On Indoor unit fan will always operate at a set fan speed except when the system is off or the outdoor unit is in defrost mode when the outdoor unit is in defrost mode the fan will operate at super low fan speed 2 Off Indoor unit fan speed can be changed by on off Terminal Purpose Functi...

Page 56: ...zer not used as an accessory PDRYCB400 Economizer used as an accessory PDRYCB320 Thermostat 3rd party Economizer used as an accessory PDRYCB320 Economizer not used as an accessory Dry Contact Selection Table 17 Dry Contact Selection Figure 42 RTU Dry Contact Selection Dry contact selection by using economizer and thermostat When using operating status output on the relay board for local supply dev...

Page 57: ...ernal pipe diameter as the connected pipe option Two shutoff valves were installed one 1 high pressure liquid one 1 low pressure vapor option Shutoff valves installed with Schrader port between the indoor unit and the ball of the valve option Condensate System N A Not Complete Complete Condensate pipe is properly sized and supported to keep lateral pressure off unit connections Condensate pipe hor...

Page 58: ...cations cable shield is tied back and is grounded at only ONE end Wall Mounted Zone Controller Communications N A Not Complete Complete LG factory provided zone controller stranded shielded white jacket cable was used between the zone controller s and indoor unit s If field wiring is used it must be 22AWG 3 conductor twisted stranded unshielded Zone controller cable has not been cut spliced or tie...

Page 59: ...on such as submittals indoor unit engineering manuals installation service product data performance general best practice and building ventilation manuals as well as white papers catalogs LATS software programs and more log in to www lghvac com ...

Page 60: ...S A Inc Air Conditioning Technologies 4300 North Point Parkway Alpharetta Georgia 30022 www lghvac com IM_MultiV_Split_Rooftop_Unit_11_21 Supersedes IM_MultiV_Split_Rooftop_Unit_07_21 IM_MultiV_Split_Rooftop_Unit_06_21 ...

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