LG ARND DCR4 Series User manual

Variable Refrigerant Flow Split Compact DOAS
ARND***DCR4 Series
(1,500 and 2,000 CFM)
LG SPLIT COMPACT DEDICATED
OUTDOOR AIR SYSTEM (DOAS)
INSTALLATION MANUAL

For continual product development, LG Electronics U.S.A., Inc. reserves the right to change specifications without notice.
© LG Electronics U.S.A., Inc.
PROPRIETARY DATA NOTICE
For more technical materials such as submittals, catalogs, engineering
manuals, and forms, visit www.lghvac.com.
Do not throw away, destroy, or lose this manual.
Please read carefully and store in a safe place for future 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 on page 4.
This document, as well as all reports, illustrations, data, information,
and other materials are the property of LG Electronics U.S.A., Inc., and are
disclosed by LG Electronics U.S.A., Inc. only in confidence.

3
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.
TABLE OF CONTENTS
Safety Precautions ......................................................................................................................................................................................................4-7
Unit Nomenclature.......................................................................................................................................................................................................... 8
Product Data .............................................................................................................................................................................................................. 9-11
Product Overview ......................................................................................................................................................................................................... 9
General Data .............................................................................................................................................................................................................. 10
Electrical Data .............................................................................................................................................................................................................11
Installation................................................................................................................................................................................................................ 12-16
Receiving, Inspection, Unpacking, Storage, Assemblies............................................................................................................................................ 12
Service Clearances, Lifting......................................................................................................................................................................................... 13
Ductwork, Access Holes, Condensate Drain Connection........................................................................................................................................... 14
Condensate Drain Connection / Drain Piping............................................................................................................................................................. 15
Common Drainage System ........................................................................................................................................................................................ 16
General Refrigerant Piping System .......................................................................................................................................................................17-24
LG Air Conditioner Technical Solution (LATS) .......................................................................................................................................................17-18
Refrigerant Safety / Selecting Piping.......................................................................................................................................................................... 19
Piping Handling .......................................................................................................................................................................................................... 20
Brazing Procedure...................................................................................................................................................................................................... 21
DOAS Layout Example / Selecting the Piping Size...............................................................................................................................................22-23
Insulation .................................................................................................................................................................................................................... 24
Electrical System..................................................................................................................................................................................................... 25-36
General Information.................................................................................................................................................................................................... 25
Wiring / Connections .................................................................................................................................................................................................. 26
Internal Routing .......................................................................................................................................................................................................... 27
Outdoor Unit to DOAS Wiring / Cable System .....................................................................................................................................................28-29
Electrical Components................................................................................................................................................................................................ 30
Terminal Connections for Electrical Components.................................................................................................................................................. 31-35
Field-Mounted Sensors .............................................................................................................................................................................................. 36
Pre-Commissioning................................................................................................................................................................................................. 37-53
Triple Leak / Pressure Check ................................................................................................................................................................................ 37-38
Triple Evacuation...................................................................................................................................................................................................39-41
Refrigerant Charge Worksheet................................................................................................................................................................................... 42
Start-Up / Checks ....................................................................................................................................................................................................... 43
DOAS Controller Setup ......................................................................................................................................................................................... 44-50
Central Controller Setting ........................................................................................................................................................................................... 51
AC Smart / ACP Controller Setup.......................................................................................................................................................................... 52-53
BACnet / Modbus Point List ...................................................................................................................................................................................54-57

4
Split Compact Dedicated Outdoor Air System 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.
The instructions below must be followed to prevent product malfunction, property damage, injury or death to the user or other people. Incor-
rect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the symbols below.
WARNING
Do not install or remove the unit by yourself
(end-user). Ask the dealer or an LG trained technician to
install the unit.
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explosion, electric shock, physical injury or death.
Installation, startup, and service must be performed by a
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Improper installation, adjustment, service, maintenance, or alteration
can cause personal injury or loss of life.
For replacement of an installed unit, always contact a
trained service provider.
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death.
Periodically check that the unit is not damaged.
There is risk of explosion, physical injury, or death.
Replace all control box and panel covers.
If cover panels are not installed securely, dust, water and animals may
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Always check for system refrigerant leaks after the unit has
been installed or serviced.
Exposure to high concentration levels of refrigerant gas may lead to
illness or death.
Do not install the unit using defective hanging, attaching,
or mounting hardware.
There is risk of physical injury or death.
Wear protective gloves when handling equipment.
Sharp edges may cause personal injury.
Dispose of the packing materials safely.
• Packing materials, such as nails and other metal or wooden parts
may cause puncture wounds or other injuries.
• Tear apart and throw away plastic packaging bags so that children
may not play with them and risk suffocation and death.
Do not install the unit in any location exposed to open
ÀDPHRUH[WUHPHKHDW Do not touch the unit with wet
hands.
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death.
Install the unit considering the potential for earthquakes.
Improper installation may cause the unit to fall, resulting in physical
injury or death.
Do not change the settings of the protection devices.
If the pressure switch, thermal switch, or other protection device is
shorted and forced to operate improperly, or parts other than those spec-
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physical injury or death.
If the unit is installed in a small space, take measures to
prevent the refrigerant concentration from exceeding safety
limits in the event of a refrigerant leak.
Consult the latest edition of ASHRAE (American Society of Heating,
Refrigerating, and Air Conditioning Engineers) Standard 15. If the re-
frigerant leaks and safety limits are exceeded, it could result in personal
injuries or death from oxygen depletion.
INSTALLATION
DANGER
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TABLE OF SYMBOLS
DANGER This symbol indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
WARNING This symbol indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION This symbol indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.
This symbol indicates situations that may result in equipment or property damage accidents only.
This symbol indicates an action that should not be performed.
SAFETY PRECAUTIONS

5
Safety Precautions
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.
CAUTION
Be very careful when transporting the product.
• Do not attempt to carry the product without assistance.
• Some products use polypropylene bands for packaging. Do not use polypropylene bands to lift the unit.
• Suspend the unit from the base at specified positions.
• Support the unit at a minimum of four points to avoid slippage from rigging apparatus.
• Failure to follow these directions may result in minor or moderate physical injury.
INSTALLATION – CONTINUED
Installation, startup, and service must be performed by a
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Improper installation, adjustment, service, maintenance, or alteration can
cause property damage.
Properly insulate all cold surfaces to prevent “sweating.”
Cold surfaces such as uninsulated pipe can generate condensate that
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walls.
Do not use the product for special purposes such as pre-
serving foods, works of art, wine coolers, or other precision
air conditioning applications.
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 become damaged.
Do not install the unit in a noise sensitive area.
Take appropriate actions at the end of HVAC equipment life
to recover, recycle, reclaim or destroy R410A refrigerant ac-
cording to applicable U.S. Environmental Protection Agency
(EPA) rules.
Install the unit in a safe location where no one can step on or
fall onto it.
There is risk of unit and property damage.
Install the drain trap to ensure adequate drainage.
There is a risk of water leakage and property damage.
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unit.
There is risk of product failure.
Always check for system refrigerant leaks after the unit has
been installed or serviced.
Low refrigerant levels may cause product failure.
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limits of the DOAS fan assembly.
Doing so may cause product malfunction.
SAFETY PRECAUTIONS

6
Split Compact Dedicated Outdoor Air System 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.
WIRING
DANGER
High voltage electricity is required to operate this system.
Adhere to the National Electrical Codes and these
instructions when wiring.
Improper connections and inadequate grounding can cause accidental
injury or death.
Always ground the unit following local, state, and National
Electrical Codes.
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the equipment.
Electric shock can cause physical injury or death.
Properly size all circuit breakers or fuses.
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WARNING
The information contained in this manual is intended for use
by an experienced, trained electrician familiar with the U.S.
National Electric Code (NEC) who is equipped with the proper
tools and test instruments.
Failure to carefully read and follow all instructions in this manual can
result in injury or death.
Ensure the unit is connected to a dedicated power source
that provides adequate power.
If the power source capacity is inadequate or the electric work is not
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death.
Refer to local, state, and federal codes, and use power wires
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:LUHVWKDWDUHWRRVPDOOPD\JHQHUDWHKHDWDQGFDXVHD¿UHDQGSK\VL-
cal injury or death.
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strain relief.
Improperly securing wires will create undue stress on equipment power
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physical injury or death.
Properly tighten all power connections.
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injury or death.
The information contained in this manual is intended for use by an experienced, trained electrician familiar with the U.S.
National Electric Code (NEC) who is equipped with the proper tools and test instruments.
Failure to carefully read and follow all instructions in this manual can result in equipment malfunction or property damage.
SAFETY PRECAUTIONS

7
Safety Precautions
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.
OPERATION
DANGER
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or submerged.
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Use a dedicated power source for this product.
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Do not operate the disconnect switch with wet hands.
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If refrigerant gas leaks out, ventilate the area before operat-
ing the unit.
If the unit is mounted in an enclosed, low-lying, or poorly ventilated area
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shock, explosion, physical injury or death.
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that no metal scraps, screws, or bits of wiring have been left
inside or surrounding the unit.
Do not use this equipment in mission critical or special-
purpose applications such as preserving foods, works of art,
wine coolers or refrigeration.
Provide power to the compressor crankcase heaters to ap-
plication outdoor units at least six (6) hours before operation
begins.
Starting operation with a cold compressor sump(s) may result in severe
bearing damage to the compressor(s). Keep the power switch on during
the operational season.
Do not block the inlet or outlet.
Unit may malfunction.
Securely attach the electrical cover to the unit.
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panel.
Periodically verify the equipment mounting hardware has not
deteriorated.
If the base collapses, the unit could fall and cause property damage or
product failure.
Do not allow water, dirt, or animals to enter the unit.
There is risk of unit failure.
WARNING
Do not allow water, dirt, or animals to enter the unit.
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Do not touch refrigerant piping during or after operation.
It can cause burns or frostbite.
Do not operate the unit with the panel(s) or protective
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moving parts.
The rotating, hot, cold, and high-voltage parts of the unit can cause
physical injury or death.
Periodically check power cable and connection for damage.
Cable must be replaced by the manufacturer, its service agent, or similar
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Securely attach the electrical cover to the unit.
Non-secured electrical covers can result in burns or electric shock due to
dust or water in the service panel.
Ensure no power is connected to the unit other than as
directed in this manual. Remove power from the unit before
removing or servicing the unit.
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CAUTION
To avoid physical injury, use caution when cleaning or servicing the unit.
SAFETY PRECAUTIONS

8
Split Compact Dedicated Outdoor Air System 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.
UNIT NOMENCLATURE
ARN D20 3DC
Electrical Ratings
U = 208-230V / 460V, 50/60Hz, 3 Phase
3 = 208-220V, 60Hz, 1 Phase
Air Flow Rate (CFM)
15 = 1,500 CFM
20 = 2,000 CFM
Type
D = Dedicated Outdoor Air System (DOAS)
Family
ARN = Multi V Indoor Unit
R410A Refrigerant
4
Generation
4 = Fourth
Chassis
DB = Type B (Rooftop DOAS)
DC = Type C (Compact DOAS)
R
Energy Recovery Wheel
R = Without Energy Recovery Wheel

9
Product Data
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.
PRODUCT OVERVIEW
Split Compact DOAS Interior Components
Control Box
- Web UI
- BACnet IP, Modbus RTU
Filters
(MERV 8)
Main Coil
Hot Gas
Reheat Coil
3D Plug Fan
ECM Motor
Bottom Access Panel
(Fan Motor Assembly)
Heat Recovery Unit

10
Split Compact Dedicated Outdoor Air System 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.
GENERAL DATA
Table 1: Split Compact DOAS General Data.
Actual discharge air temperatures may vary from discharge air temperature set-point due to changes in outdoor air processing loads.
Unit Model No. ARND153DCR4 ARND203DCR4
Cooling Mode Performance
Total Cooling Capacity (Btu/h) 120,000 143,100
Hot Gas Reheat Capacity (Btu/h) 24,000 30,000
Moisture Removal Capacity (lb. / h) 37.2 51.5
Heating Mode Performance
Capacity (Btu/h) (Main Coil) 51,000 59,900
Entering Air
Cooling Maximum (°F, D.B. / W.B.) 122 / 78 122 / 78
Heating Minimum (°F, D.B.) 14 14
Unit Data
Refrigerant Type1R410A R410A
Refrigerant Control EEV EEV
Sound Power dB(A)274 72
Net Unit Weight (lbs.) 364 364
Shipping Weight (lbs.) 420 420
Communication Cable3 (No. x AWG) 4 x 18 4 x 18
Fan
Type 3D Plug 3D Plug
Motor (HP / W) 1 / 750 1 / 750
Motor / Drive ECM / Direct ECM / Direct
Airflow Rate (CFM) 1,500 2,000
External Static Pressure (in. w.g.) 2.0 1.5
Airflow Range (CFM) 1,000 – 1,500 1,000 – 2,000
Piping
Liquid Connection Size (in., O.D.) 1/2 Brazed 1/2 Brazed
High Pressure Vapor Connection Size (in., O.D.) 3/4 Brazed 7/8 Brazed
Low Pressure Vapor Connection Size (in., O.D.) 1-1/8 Brazed 1-1/8 Brazed
Condensate Drain OD (in.) 11
Filter
Outdoor 2"Merv 8 (25"x 20")2"Merv 8 (25"x 20")
EEV - Electronic Expansion Valve
ECM - Electronically Commutated Motor
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codes.
This data is rated 0 ft. above sea level, with 25 ft. of refrigerant piping per coil.
Main Coil Cooling Capacity Rating obtained with entering air of 95°F D.B. / 75°F W.B. and
leaving air of 52.9°F D.B. / 52.5°F W.B.
Main Coil Heating Capacity Rating obtained with entering air of 44°F D.B. and leaving air
of 70°F D.B.
Reheat Coil Heating Capacity Rating obtained with entering air of 54°F D.B. and leaving
air of 75°F D.B.
1Take appropriate actions at the end of HVAC equipment life to recover, recycle, reclaim or
destroy R410A refrigerant according to applicable regulations (40 CFR Part 82, Subpart F)
under section 608 of CAA.
2Sound power levels are tested under AHRI 260 Standard.
3Communication cable from the outdoor unit to the DOAS unit to be minimum 18 AWG,
4-conductor, twisted, stranded, shielded and must comply with applicable local and nation-
al codes. Ensure the communication cable is properly grounded at the outdoor unit only.
Do not ground the outdoor unit - DOAS communication cable at any other point.
Power Supply (V/Hz/Ø): 208-230/60/1

11
Product Data
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 DATA
Table 2: Split Compact DOAS Electrical Data
Model Voltage Range MCA MOP Power Supply
Hz Volts Phase
ARND153DCR4 187-253 7.3 15 60 208-230 1
ARND203DCR4
MCA : Minimum Circuit Ampacity. MOP : Maximum Overcurrent Protection. 3RZHUZLULQJLV¿HOGVXSSOLHGDQGPXVWFRPSO\ZLWKWKH
applicable local and national codes.
Electrical Data

12
Split Compact Dedicated Outdoor Air System 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.
INSTALLATION
Receiving and Inspection
Upon receiving the product, verify that all pieces listed on the bill of lading, delivery receipt, or packing list have been received.
Inspect each crate or carton for shipping damage before accepting delivery. Alert the carrier if any damage is detected; do not refuse
shipment. The customer must note any damage (or shortage of items) on the delivery receipt and all copies of the bill of lading, which then
should be signed by the delivery carrier. Photograph the damage if possible. If damaged, immediately contact your manufacturer’s represen-
tative.
Any physical damage to the unit after acceptance is not the manufacturer’s responsibility.
Handling
Handle in such a manner as to keep from scratching or chipping the unit. A damaged finish may reduce ability of unit to resist corrosion.
Unpacking
Verify that all required parts and the correct quantity of each item have been received. If any items are missing, report shortages to your local
manufacturer’s representative to obtain the missing parts. Confirmation of shipment(s) must be limited to only the items on the bill of lading.
Storage
Units are protected against damage during shipment. If the unit cannot be installed and operated immediately, precautions need to be taken
to prevent deterioration of the unit during storage. The user assumes responsibility of the unit and accessories while in storage. The manu-
facturer will not be responsible for damage during storage. These suggestions are provided solely as a convenience to the user.
The ideal environment for storing the units and accessories designed for indoor applications is indoors, above grade, in a low humidity at-
mosphere that is sealed to prevent dust, rain, or snow from entering. Units designed for outdoor applications may be stored outdoors, but all
accessories must be stored indoors in a clean, dry atmosphere.
Removing from Storage
As units are removed from storage to be installed in their final location, they should be protected and maintained in a similar fashion until
the equipment goes into operation. Before installing the unit and system components, inspect the unit assembly to make sure it is in working
order:
1. Check all fasteners, set screws on the fan, wheel, bearings, drive, motor base, and accessories for tightness.
2. Rotate the fan wheel(s) by hand to ensure parts are not in contact with one another and are causing friction / damage.
Assemblies
• Blower - One plenum-type fans (LG 3D Plug). All units are equipped with a plenum fan for supply air.
• Coils - Evaporator Coil and Reheat Coil.
• Filters - Two (2) inch thick pleated paper MERV 8 (standard, factory-supplied) or two (2) inch thick pleated paper MERV 13 (field-supplied)
in the supply air stream.
• Split direct exchange (DX) system - DOAS unit installed with a Multi V 5 heat recovery outdoor unit..
$LUÀRZ$UUDQJHPHQW
The unit is capable of Constant Air volume (CAV) with two different modes. One mode is “CFM Modulation” that automatically follows the
target CFM value; the other mode is manually set up using the Air Volume with RPM (%) setting.
Receiving, Inspection, Unpacking, Storage, Assemblies

13
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.
INSTALLATION
• Failure to follow proper instructions could result in serious injury or death.
• Use the appropriate crane equipment to transport each unit; ensure the crane is capable of supporting the weights listed in the tables. If the
crane is not properly secured, it may result in an accident that causes physical injury or death.
• Never lift the units in windy conditions.
• Wear protective gloves when handling equipment. Sharp edges may cause personal injury.
• Tear apart and throw away plastic packaging so that children may not play with them and risk suffocation and death.
WARNING
Failure to follow proper instructions could result in property damage.
Service Clearances
Allow service clearances as indicated in the figures below. Refer to NEC and local guidelines for minimum clearances around the unit and
control panel.
Figure 1: Installation / Service Clearances.
Lifting
1. Before lifting, check that all shipping materials have been re-
moved from unit.
2. To assist in determining rigging requirements, see weights in
the table at right, or in the general specifications table in this
manual.
3. Always test-lift the unit to check for proper balance and rigging
before hoisting to desired location.
Table 3: Weights.
Model No. ARND153DCR4 ARND203DCR4
Net Weight (lbs.) 364 364
Service Clearances, Lifting

14
Split Compact Dedicated Outdoor Air System 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.
INSTALLATION
Ductwork Configuration
When connecting ducts, install a canvas duct between the main body and the duct.
• Use non-combustible duct components.
• Install sufficient insulation to prevent condensation forming on outlet duct flanges and outlet ducts.
The contractor is responsible for providing transitions to accommodate difference in sizing between the unit and 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 leaks and system performance problems.
When an air duct that carries supply air or warm air passes through a combustible roof, a clearance of one inch must be maintained between the
outside perimeter of ductwork and any combustible materials, per NFPA Standard 90A.
Access Holes
Two (2) knock out / access holes are provided on the cabinet for
power wiring and communications cable connections.
Figure 2: Split Compact DOAS Access Holes (Bottom).
Condensate Drain Connection
All condensate drain connections must be properly trapped and primed before operating the unit. Failure to
SURSHUO\WUDSDGUDLQZLOOUHVXOWLQÀRRGLQJWKHGUDLQSDQDQGSRWHQWLDOZDWHUGDPDJHWRWKHXQLWRUEXLOGLQJ
Split Compact DOAS has a factory-mounted condensate pump that operates continuously while the unit
is in cooling mode. The pump has an internal high-level float switch that will shut off the DOAS unit if the
water level in the pan gets too high.
The unit has a flexible drain hose kit and one (1) or two (2) clamps. The hose can be used to connect
the condensate pipe to the condensate pump connection. There is the option to directly connect a 1 NPT
fitting to the drain pan’s gravity drain connection.
When the receiving drain line is mounted horizontal, connect the inverted trap to the top half of the pipe.
The connection point of the inverted trap to the building drain pipe must always be to the top half of the
pipe and must never be over 45° either side of the upper most point of the horizontal building drain line.
If connecting to a vertical drain line or plumbing system vent line, connect the unit condensate pump
discharge line using a Y-45 fitting with the double end of the Y-45 fitting facing up. When connecting to a
vertical drain line include an inverted trap at the top of the unit condensate pump discharge riser before
connection to the Y-45 fitting.
Figure 3: Flexible Drain Hose.
Ductwork, Access Holes, Condensate Drain Connection

15
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.
INSTALLATION
When connecting the condensate piping, do not exert lateral force
on the drain connections. Internal damage will occur. Refer to the table
above for condensate pipe connection sizes.
No. Drain Type A (in.) B (in.) C (in.) Diameter (in.)
#1 Drain Pump (27-1/2 Lift) 19.7 13.6 3.8 1 inch Plain, I.D.
#2 Gravity 1 inch, NPT, O.D.
Table 4: Drain Size and Locations Table.
Figure 4: Drain Size and Locations.
The figures below show the layout of the condensate drain connection. The distance from the drain pan outlet to the horizontal run of the
P-trap should be a distance of twice the static pressure in the drain pan
Drain Piping
• Drain piping must have down slope (1/50 to 1/100).
• Any holes through the ceilings, walls, etc., must be large enough to accommodate
the drain piping and insulation.
7RSUHYHQWUHYHUVDOÀRZGRQRWSURYLGHXSDQGGRZQVORSH
Drain Leak Test
A leak test must be performed 24 hours after the drainage system has been installed.
Drain Pipe Insulation
Install field supplied polyethylene foam insulation 5/16 inch thick or greater on the
flexible drain pipe and position snugly against the indoor unit.
Figure 5: Drain Piping Slope.
Maintenance
drain port
Upward
routing
not allowed
Pipe clamp
Indoor unit
Condensate Drain Connection / Drain Piping

16
Split Compact Dedicated Outdoor Air System 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.
INSTALLATION
Figure 6: Example of a Common Drainage System.
Common Drainage System
It is usual work practice to connect individual Split
Compact DOAS drain pipes to one common drainage
system.
The diameter of the common vertical drain pipe
must be as large as necessary. The diameter of the
horizontal pipe must be the same or larger than the
vertical drain pipe. To avoid property damage in the
event of the primary drain becoming clogged, and to
optimize drain system performance, it may be prudent
to install a secondary drain line.
Design the drain system to plan for winter opera-
tion (condensate line may freeze up if condensate
does not properly drain away). Drain all generated
condensate from the external condensate pan to an
appropriate area. Install a trap in the condensate lines
as near to the indoor unit coil as possible. To prevent
overflow, the outlet of each trap must be positioned
below its connection to the condensate pan. All traps
must be primed, insulated, and leak tested.
• It is recommended that a dedicated drain pipe be installed for the air conditioning
system. If the drainage system is shared with a rainwater drain, waste water, or
any other type of building drain system, back flow, leaks, ice may form, or noxious
odors may infiltrate the air conditioning system.
• Install a trap if the drain access to the outside faces an undesirable location (i.e.,
sewer), otherwise, noxious odors may infiltrate the air conditioning system.
Common horizontal drain pipe
1/50 to 1/100 Slope
27-1/2 in.
(Maximum pump
lift distance
[depends on indoor
unit type]).
Include trap
at the end.
45° to 60° Angle
Position the vent
down to prevent
debris from entering
the system
45° to 60° Angle
45° to 60° Angle
45° to 60° angle for protection against overflow
Common
vertical
drain pipe
Common Drainage System

17
General Refrigerant Piping System Information
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.
GENERAL REFRIGERANT PIPING SYSTEM
LG Air Conditioner Technical Solution (LATS) Software
A properly designed and installed refrigerant piping system is critical to the optimal performance of LG air-conditioning systems. To assist
engineers, LG offers, free of charge, LG Air Conditioner Technical Solution (LATS) software—a total design solution for LG air conditioning
systems.
To reduce the risk of designing an improper applied system or one that will not operate correctly, LG requires that LATS software be used on all
projects.
Formats
LATS is available to LG customers in three user interfaces: LATS HVAC, LATS CAD2, and LATS Revit. All three LATS formats are available
through www.myLGHVAC.com, or contact an LG Sales Representative.
LATS HVAC is a Windows®-based application that aids engineers in designing LG Variable Refrigerant Flow (VRF), Multi F / Multi F MAX,
Single-Zone, and Energy Recovery Ventilator (ERV) systems.
*Windows®is a registered mark of Microsoft®Corporation.
LATS CAD2 combines the LG LATS program with AutoCAD®
software**. It permits engineers to layout and validate LG Multi V
Variable Refrigerant Flow (VRF), Multi F / Multi F MAX, Single-Zone,
and Energy Recovery Ventilator (ERV) systems directly into CAD
drawings.
LATS Revit integrates the LG LATS program with Revit®software**.
It permits engineers to layout and validate Multi V VRF systems
directly into Revit drawings.
**AutoCAD and Revit are both registered marks of Autodesk, Inc.
Features
All LG product design criteria have been loaded into the program, making LATS simple to use: double click or drag and drop the component
choices. Build systems in Tree Mode where the refrigerant system can be viewed. Switch to a Schematic diagram to see the electrical and
communications wiring.
LATS software permits the user to input region data, indoor and outdoor design temperatures, modify humidity default values, zoning, specify
type and size of outdoor units and indoor units, and input air flow and external static pressure (ESP) for ducted indoor units.
The program can also:
LG Air Conditioner Technical Solution (LATS)
• Import building loads from a separate Excel file.
• Present options for outdoor unit auto selection.
• Automatically calculate component capacity based on design
conditions for the chosen region.
• Verify if the height differences between the various system
components are within system limits.
• Provide the correct size of each refrigerant piping segment and LG
Y-Branches and Headers.
• Adjust overall piping system length when elbows are added.
• Check for component piping limitations and flag if any parameters
are broken.
• Factor operation and capacity for defrost operation.
• Calculate refrigerant charge, noting any additional trim charge.
• Suggest accessories for indoor units and outdoor units.
• Run system simulation.
Features depend on which LATS program is being used, and the type of system being designed.
Figure 7: Example of LATS CAD2.

18
Split Compact Dedicated Outdoor Air System 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.
GENERAL REFRIGERANT PIPING SYSTEM
LATS Generates a Complete Project Report
LATS software also generates a report containing project design parameters, cooling and heating design data, system component perfor-
mance, and capacity data. The report includes system combination ratio and refrigerant charge calculations; and provides detailed bill of
material, including outdoor units, indoor units, control devices, accessories, refrigerant pipe sizes segregated by building, by system, by pipe
size, and by pipe segments. LATS can generate an Excel GERP report that can imported into the LG SOPS pricing and ordering system.
Proper Design to Install Procedure
LG encourages a two report design-to-install-procedure. After the
design engineer determines building / zone loads and other details,
the engineer opens the LATS program and inputs the project’s infor-
mation. When the design is complete, the “Auto Piping” and “System
Check” functions must be used to verify piping sizes, limitations, and
if any design errors are present. If errors are found, engineers must
adjust the design, and run Auto Piping and System Check again.
When the design passes the checks, then the engineer prints out
a project “Shop Drawing” (LATS Tree Diagram) and provides it to
the installing contractor. The contractor must follow the LATS Tree
Diagram when building the piping system, but oftentimes the design
changes on the building site:
• Architect has changed location and/or purpose of room(s).
• Outdoor unit cannot be placed where originally intended.
• Structural elements prevent routing the piping as planned.
• Air conditioning system conflicts with other building systems (plumbing, gas lines, etc.).
The contractor must mark any deviation from the design on the Shop Drawing, including as-built straight lines and elbows. This “Mark Up”
drawing must be returned to the design engineer or Rep, who must input contractor changes into the LATS file. (Copy the original LATS soft-
ware file, save and rename as a separate file, and modify all piping lengths by double-clicking on each length and editing information.) Like
the shop drawing, the Auto Piping and System Check must also be run on this new “As Built” drawing. The design engineer or Rep must then
provide the final As Built file to the contractor. The Mark Up version must be compared to the As Built version for:
• Differences in pipe diameter(s). If incorrect diameters have been installed, the piping must be changed out. If pipe diameters have changed,
check to see if Y-Branches will also need to be changed.
• Changes to outdoor unit and indoor unit capacities. Capacities changes could impact line length changes.
• Additional refrigerant charge quantity (“Trim Charge”). Trim charge will change if piping lengths and diameters change. The As Built version
must reflect installed piping lengths to ensure correct trim charge.
All documents submitted by the contractor, as well as the Shop Drawing and the As Built Drawing files must be provided for commissioning
purposes. Model and serial numbers for all system components must also be submitted. If the steps previously detailed are not followed,
and all documents are not provided to the commissioning agent, the project runs the risk of not being commissioned and voiding any limited
warranty LG offers on the equipment.
Figure 8: Example of a LATS Tree Diagram.
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LG Air Conditioner Technical Solution (LATS)

19
General Refrigerant Piping System Information
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.
GENERAL REFRIGERANT PIPING SYSTEM
Refrigerant Safety Standards
ASHRAE Standards 15-2010 and 34-2010 address refrigerant safety and the maximum allowable concentration of refrigerant in an occupied
space. Refrigerant will dissipate into the atmosphere, but a certain volume of air is required to safely dissipate the refrigerant. For R410A
refrigerant, the maximum allowable concentration of refrigerant is 26 lbs./1,000 cubic feet (Addendum L modified the RCL to 26) of occupied
spaces. Buildings with 24-hour occupancy allow half of that concentration.
If a VRF system develops a refrigerant leak, the entire refrigerant charge of the system will dump into the area where the leak occurs. To
meet ASHRAE Standards 15 and 34, the smallest room volume on the system must be calculated and compared to the maximum allowable
concentration. If the concentration level is higher than allowed, the following are some design suggestions to eliminate the problem:
• Split dual-frame and triple-frame systems into single-frame systems that have lower refrigerant charges.
• Add transfer grilles in the ceiling or walls of the smaller rooms to increase the volume of the room.
• Remove the smallest space from the system and serve it with a smaller mini-split system.
Selecting Field-Supplied Copper Piping For DOAS Units
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LG prefers the use of hard drawn copper in pipe segments connecting a Dedicated Outdoor Air System (DOAS) product and a heat recovery
outdoor unit.
Table 5: ACR Rated Copper Tubing Material.
Table 6: ACR Rated Piping Wall Thicknesses.
Type Seamless Phosphorous Deoxidized
Class UNS C12200 DHP
Straight Lengths H58 Temper
Coils O60 Temper
OD (in) 1/4 3/8 1/2 5/8 3/4 7/8 1-1/8 1-3/8 1-5/8
Material Rigid or Soft ACR Rated for R410A Rigid or Soft ACR Rated for R410A
Min. Bend Radius (in) 0.563 0.9375 1.5 2.25 3.0 3.0 3.5 4.0 4.5
Min. Wall Thickness (in) 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.04 0.050
)RUPRUHLQIRUPDWLRQRQJHQHUDOUHIULJHUDQWSLSLQJV\VWHPEHVWSUDFWLFHVVHHWKH0XOWL92XWGRRU8QLW,QVWDOODWLRQ0DQXDORQZZZOJKYDFFRP
Nominal Pipe
Outside
Diameter (in)
Actual Outside
Diameter (in)
Tempered (Hard Drawn) Annealed (Soft)
Nominal Wall
Thickness (in) Weight (lb/ft) Cubic ft per Linear ft
Nominal Wall
Thickness (in) Weight (lb/ft) Cubic ft per Linear ft
1/4 0.250 -- -- -- 0.030 0.081 0.00020
3/8 0.375 0.030 0.126 0.00054 0.032 0.134 0.00053
1/2 0.500 0.035 0.198 0.00101 0.032 0.182 0.00103
5/8 0.625 0.040 0.285 0.00162 0.035 0.251 0.00168
3/4 0.750 0.042 0.362 0.00242 0.042 0.362 0.00242
7/8 0.875 0.045 0.455 0.00336 0.045 0.455 0.00336
1-1/8 1.125 0.050 0.655 0.00573 0.050 0.655 0.00573
1All dimensions provided are in accordance with ASTM B280 – Standard.
2Design pressure = 551 psig.
3The Copper Tube Handbook, 2010, Copper Development Association Inc., 260 Madison Avenue, New York, NY 10016.
Table 7: ACR Copper Tubing Dimensions and Physical Characteristics1-3
• Commercially available piping often contains dust and other materials. Always blow it clean with a dry nitrogen.
• Prevent dust, water or other contaminants from entering the piping during installation.
Refrigerant Safety / Selecting Piping

20
Split Compact Dedicated Outdoor Air System 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.
GENERAL REFRIGERANT PIPING SYSTEM
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Piping Handling
Pipes used for the refrigerant piping system must include the specified thickness, and the
interior must be clean.
While handling and storing, do not bend or damage the pipes, and take care not to
contaminate the interior with dust, moisture, etc.
Clean Airtight
No moisture should be inside the piping. No dust should be inside the piping. No leaks should occur.
Possible
Problems
- Significant hydrolysis of refrigerant oil.
- Refrigerant oil degradation.
- Poor insulation of the compressor.
- System does not operate properly.
- EEVs, capillary tubes are clogged.
- Refrigerant oil degradation.
- Poor insulation of the compressor.
- System does not operate properly.
- EEVs and capillary tubes become
clogged.
- Refrigerant gas leaks / shortages.
- Refrigerant oil degradation.
- 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 maximum of 500
microns and insure the vacuum holds at
that level for 1 hour.
- Remove dust from the piping.
- Piping ends should remain capped until
connections are complete.
- Connect piping properly at the side of
the unit.
- Remove caps only after the piping is cut
and burrs are removed.
- Retain the cap on the piping when
passing it through walls, etc.
- Test system for air tightness.
- Perform brazing procedures that comply
with all applicable standards.
- Perform flaring procedures that comply
with all applicable standards.
- Perform flanging procedures that
comply with all applicable standards.
- Ensure that refrigerant lines are pressure
tested to 550 psig and hold for 24 hours.
Moisture Dust Leaks
Keep Pipes Capped While Storing.
Keep refrigerant pipe dry, clean, and airtight.
Piping Handling