Installation, Operation & Maintenance Manual
Variable Refrigerant Flow Water Source Units
3.0, 4.0, and 4.4 Tons
Heat Pump 208-230V, 60Hz, 1 Phase
ARWN038GA2
ARWN048GA2
ARWN053GA2
PROPRIETARY DATA NOTICE
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.
This document is for design purposes only.
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.
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 below.
"
" This symbol indicates that the action or lack thereof could possibly cause death or personal injury.
"
"
"
"
This symbol indicates that the action or lack thereof could possibly cause property damage.
Note: " This symbol indicates that the action or lack thereof could possibly cause equipment malfunction or failure.
"
This symbol indicates that the following action should not be performed.
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 the right to change specifications without notice.
©LG Electronics U.S.A., Inc.
This document, as well as all reports, illustrations, data, information, and other materials are the property of LG Electronics U.S.A., Inc.
TABLE OF CONTENTS
Safety Precautions������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������ 4-7
Installation…�������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 4-5
Wiring������������������������������������������������������������� 6
Operation����������������������������������������������������������� 7
Nomenclature���������������������������������������������������������� 8
Water Source Unit Specifications���������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 9-16
General and Electrical Data������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������ 9
Dimensions����������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 10
Refrigerant Circuits������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������ 11-13
Wiring Diagram����������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 14
Accessories����������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 15-16
Installation��������������������������������������������������������� 17-62
Placement Considerations������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������ 17
Transporting / Lifting the Water Source Unit��������������������������������������������������������������������������������������������������������������������������������������������������������������� 18
Minimum Space Requirements���������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 19
General Mounting / Anchoring the Water Source Unit������������������������������������������������������������������������������������������������������������������������������������������������ 20
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 Unit Auto Addressing Auto Addressing������������������������������������������������������������������������������������������������������������������������������������������������������� 63-66
Group Control������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 67
Central Control������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������ 67-69
Indoor Unit Temperature Sensing Strategy / Air Balance������������������������������������������������������������������������������������������������������������������������������������������� 70
Prepare the Refrigerant Piping System���������������������������������������������������������������������������������������������������������������������������������������������������������������������� 71
Preparing / Balancing the Water Circuit���������������������������������������������������������������������������������������������������������������������������������������������������������������������� 72
Prepare Pre-commissioning Package Documents����������������������������������������������������������������������������������������������������������������������������������������������������� 73
Initiate a Request�������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 73
Maintaining the Heat Exchanger�������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 74
General Maintenance Schedule���������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 75-76
Error Codes�������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 77-82
LG Monitoring View (LGMV) Diagnostic Software������������������������������������������������������������������������������������������������������������������������������������������������� 77-78
Error Code Tables�������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 79-81
Checklists����������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 83-90
LG Multi V Pre-Commissioning Device
Configuration Worksheet�������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 83
Installation Checklist���������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 84-85
Pre-commissioning Checklist�������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 86-89
Refrigerant Charge Worksheet����������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 90
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.
3
Product Data
Refrigerant Piping Installation������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 21-40
Computer-assisted Refrigerant Pipe Design�������������������������������������������������������������������������������������������������������������������������������������������������������������� 21
System Engineering���������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 22-30
Pipe Sizing������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 31-34
Refrigerant Pipe Connections�������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 35-37
Insulating the Refrigerant Piping System�������������������������������������������������������������������������������������������������������������������������������������������������������������� 38-39
Pressure Testing �������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 40
SAFETY PRECAUTIONS
The instructions below 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 below.
"
"
"
MULTI V Water Mini System Installation Manual
"
"
"
This symbol indicates that the action or lack thereof could possibly cause death or personal injury.
This symbol indicates that the action or lack thereof could possibly cause property damage.
Note: " This symbol indicates that the action or lack thereof could possibly cause equipment malfunction or failure.
"
This symbol indicates that the following action should not be performed.
INSTALLATION
Do not install, remove, or re-install the unit by yourself
(customer). Ask the dealer or an authorized technician to
install the unit.
Improper installation by the user may result in water leakage, fire,
explosion, electric shock, physical injury or death.
For replacement of an installed unit, always contact an
authorized LG service provider.
There is risk of fire, electric shock, explosion, and physical injury or death.
Do not install the water-source units outside.
There is risk of fire, electric shock, explosion, and physical injury or death.
Be very careful when transporting the product.
•One person should not carry the product.
•Some products use polypropylene bands for packaging. Do not use
polypropylene bands to lift the unit.
•Suspend the water source unit from the base at specified positions.
Support the water source unit a minimum of four points to avoid slippage from rigging apparatus.
The water source unit is shipped with refrigerant and the service 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, refrigerant loss, physical injury or death.
The water source unit is shipped with a refrigerant and
service valves closed. Do not run the compressor with the
service valves closed.
There is a risk of equipment damage, explosion, physical injury, or death.
4
Dispose 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.
Install the unit considering the potential for strong winds or
earthquakes.
Improper installation may cause the unit to fall over, resulting in physical
injury or death.
If the air conditioner 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
refrigerant leaks and safety limits are exceeded, it could result in personal
injuries or death from oxygen depletion.
Wear protective gloves when handling equipment. Sharp
edges may cause personal injury.
Do not install the unit on a defective stand.
It may result in an accident that causes product damage or personal 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
specified by LG are used, there is risk of fire, electric shock, explosion,
and physical injury or death.
Do not store or use flammable gas or combustibles near the
unit.
There is risk of product failure, fire, explosion, and physical injury or death.
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.
SAFETY PRECAUTIONS
INSTALLATION, CONTINUED
Replace all control box and panel covers.
If cover panels are not installed securely, dust, water and animals may
enter the water source unit, causing fire, electric shock, and physical injury or death.
Always check for system refrigerant leaks after the unit has
been installed or serviced.
Low refrigerant levels may cause product failure, and exposure to high
concentration levels of refrigerant gas may lead to illness or death.
Install the unit in a safe location where nobody can step on
or fall onto it.
There is risk of unit damage, physical injury or death.
Keep the unit upright during installation.
To avoid vibration or water leakage.
This may prevent water damage and reduce abnormal vibration.
Properly insulate all cold surfaces to prevent “sweating.”
Cold surfaces such as uninsulated piping can generate condensate that
may drip and cause a slippery floor condition and / or water damage to
walls.
Note:
Inverter equipment, power generators, high-frequency medical equipment, or radio communication equipment may cause the air conditioner
to operate improperly. The unit may also affect such equipment by creating electrical noise that disturbs medical treatment or image broadcasting.
Do not use the product for special purposes such as preserving 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.
Do not install the water source unit in a noise sensitive area.
When connecting refrigerant tubing, remember to allow for
pipe expansion.
Take appropriate actions at the end of HVAC equipment life
to recover, recycle, reclaim or destroy R410A refrigerant
according to applicable U.S. Environmental Protection
Agency (EPA) rules.
If a different refrigerant is used, or air mixes with original refrigerant, the
unit will malfunction and be damaged.
Improper piping may cause refrigerant leaks and system malfunction.
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.
5
Product Data
When installing the water source unit in a low-lying area, or
a location that is not level, use a raised concrete pad or concrete blocks to provide a solid, level foundation.
When installing the unit in a hospital, data center, or similar
electromagentic field (EMF) sensitive environment, provide
sufficient protection against electrical noise.
SAFETY PRECAUTIONS
WIRING
The information contained in this manual is intended for use
by an industry-qualified, experienced, certified electrician
familiar with the U.S. National Electric Code (NEC) who is
equipped with the proper tools and test instruments.
MULTI V Water Mini System Installation Manual
Failure to carefully read and follow all instructions in this manual can
result in equipment malfunction, property damage, personal injury or
death.
All electric work must be performed by a licensed electrician
and conform to local building codes or, in the absence of
local codes, with the National Electrical Code, and the
instructions given in this manual.
If the power source capacity is inadequate or the electric work is not
performed properly, it may result in fire, electric shock, physical injury or
death.
High voltage electricity is 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.
Refer to local, state, and federal codes, and use power wires
of sufficient current capacity and rating.
Wires that are too small may generate heat and cause a fire.
Secure all field wiring connections with appropriate wire
strain relief.
Improperly securing wires will create undue stress on equipment power
lugs. Inadequate connections may generate heat, cause a fire and physical injury or death.
Properly tighten all power lugs.
Loose wiring may overheat at connection points, causing a fire, physical
injury or death.
Do not change the settings of the protection devices.
If the pressure switch, thermal switch, or other protection devices
are bypassed or forced to work improperly, or parts other than those
specified by LG are used, there is risk of fire, electric shock, explosion,
and physical injury or death.
Turn the power off at the nearest disconnect before servicing
the equipment.
Electrical shock can cause physical injury or death.
Properly size all circuit breakers or fuses.
There is risk of fire, electric shock, explosion, physical injury or death.
Note:
Do not supply power to the unit until all installation and precommissioning tasks are complete and the commissioning
agent indicates it is safe to do so.
6
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.
SAFETY PRECAUTIONS
OPERATION
Do not allow water, dirt, or animals to enter the unit.
There is risk of unit failure, fire, electric shock, physical injury or death.
Do not provide power to or operate the unit if it is flooded or
submerged.
There is risk of fire, electric shock, physical injury or death.
Use a dedicated 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.
If gas leaks out, ventilate the area before operating the unit.
Leaking gas may cause fire, electric shock, explosion, physical injury or
death if the water source unit is mounted in an enclosed, low-lying, or
poorly ventilated area and the system develops a refrigerant leak.
To avoid physical injury, use caution when cleaning or
servicing the air conditioner.
The water source unit is shipped with refrigerant and the service 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, refrigerant loss, physical injury or death.
Do not touch the refrigerant piping during or after operation.
The water source unit is shipped with a refrigerant and
service valves closed. Do not run the compressor with the
service valves closed.
If the base collapses, the unit could fall and cause property damage,
product failure, physical injury or death.
It can cause burns or frostbite.
There is a risk of equipment damage, explosion, physical injury, or death.
Do not operate the unit with the panel(s) or protective
cover(s) removed; keep fingers and clothing away from
moving parts.
The rotating, hot, cold, and high-voltage parts of the unit can cause
physical injury or death.
Do not use this equipment in mission critical or specialpurpose applications such as preserving foods, works of art,
wine coolers or refrigeration. The equipment is designed to
provide comfort cooling and heating.
Oil, steam, sulfuric smoke, etc., can significantly reduce the performance of the unit, or damage its parts.
Do not turn off the main power switch after operation has
been stopped.
Wait at least five (5) minutes before turning off the main power
switch, otherwise it may result in product malfunction.
Provide power to the compressor crankcase heaters 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.
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.
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.
7
Product Data
Periodically verify the equipment mounts have not
deteriorated.
UNIT NOMENCLATURE
Water Mini Unit
Water Source Units (WSU)
AR
W
N
038
G
MULTI V Water Mini System Installation Manual
Family
AR = Multi V (Refrigerant R410A)
Condenser
W = Water Source
Type
N = Heat Pump
Nominal Capacity
Nominal cooling capacity in Btu/h
038 = 38,200
048 = 47,800
053 = 52,900
Electrical Ratings
G = 208–230V / 60Hz / 1Ø
Basic Function = A
Generation
2 = Second
8
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.
A
2
GENERAL DATA
Water Mini Unit Specifications and Electrical Data
1
Cooling – Indoor 80°F DB/66°F WB, Water Temp. Entering 86°F;
Heating- Indoor 68°F DB, Water Temp. Entering 68°F.
2
Voltage tolerance is ±10%.
3
Sound pressure levels as tested in anechoic chamber under ISO
Standard 3745.
4
Refer to the Refrigerant Piping Section of this manual for correct
line sizing. Contractor MUST use LG manufactured Y-branch fittings
only. Designer must verify refrigerant piping design configuration
using LG’s computerized refrigerant piping CAD/calculation (LATS)
Software to layout and design the refrigerant piping system.
5
Calculated from ∆T = Total Heat of Rejection / (Nominal flow rate
x 500).
Table 2: 208-230V, 60Hz, 1-Phase Water Mini Unit Electrical Characteristics.
Nominal Tons
3.0
4.0
4.4
Unit Model No.
ARWN038GA2
ARWN048GA2
ARWN053GA2
Compressor Qty.
1
1
1
MCA = Minimum Circuit Ampacity.
MOP = Maximum Overcurrent Protection is calculated as follows: (Largest motor FLA x 2.25) + (Sum of
other motor FLA) rounded down to the nearest standard fuse size.
Allowable voltage range is between 208–230 volts only (tolerance is 10%).
Maximum allowable voltage imbalance is 2%.
Compressor Motor RLA
20.8
21.2
21.6
MSC
-
MCA
26
26.5
27
MOP
45
45
45
Power wiring to be sized to meet local or NEC codes.
Measurements are taken with 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.
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.
9
Product Data
Table 1: General Data—ARWN038GA2, ARWN048GA2, ARWN053GA2 Water Mini Units.
3.0 Ton
4.0 Ton
4.4 Ton
Model Number
ARWN038GA2
ARWN048GA2
ARWN053GA2
Nominal Capacity / Input Power
38,200
47,800
52,900
Cooling Capacity (Btu/h)1
Cooling Input Power (kW)
2.1
2.7
3.2
Heating Capacity (Btu/h)1
42,600
54,600
61,400
Heating Input Power (kW)
2.2
2.9
3.5
Compressor
Type
Inverter Rotary
Inverter Rotary
Inverter Rotary
Power Supply (volt/hz/phase)2
208-230 / 60 / 1
208-230 / 60 / 1
208-230 / 60 / 1
MCA (A)
26
26.5
27
MOP (A)
45
45
45
System Data
Sound Pressure (dBA)3
52
53
54
Heat Rejected to Equipment Room (Btu/h)
512
512
512
Net Weight (lbs)
168
168
168
Shipping Weight (lbs)
181
181
181
Dimensions (W x H x D)
20-5/8 x 42-1/2 x 13-1/8
20-5/8 x 42-1/2 x 13-1/8
20-5/8 x 42-1/2 x 13-1/8
Max. Qty Indoor Units
6
8
9
Refrigerant Piping Connections4
Vapor Line OD (in)
3/4 Braze
3/4 Braze
3/4 Braze
Liquid Line OD (in)
3/8 Braze
3/8 Braze
3/8 Braze
Expansion Device
Electronically Controlled (EEV) Electronically Controlled (EEV) Electronically Controlled (EEV)
Factory Refrigerant Charge (R410A [lbs])
2.2
2.2
2.2
Water Side
Heat Exchanger
Stainless Steel Plate
Stainless Steel Plate
Stainless Steel Plate
0.2
0.2
0.2
Water Volume in Heat Exchanger (gal.)
Water Inlet/Outlet Connection
1-1/4 FPT
1-1/4 FPT
1-1/4 FPT
Size (in)
10.6
13.2
15.9
Nominal Flow Rate Total (GPM)
5.5-13.3
6.9-16.5
8.3-19.9
Range of Flow (GPM)
Entering water temp. range (°F)– Cooling
50-113
50-113
50-113
Entering water temp. range (°F)– Heating
23-113
23-113
23-113
Total Heat of Rejection (Btu/h)
44,330
55,550
56,640
Total Heat of Absorption (Btu/h)
35,087
44,697
49,448
Pressure Drop (ft)
4.7
6.9
9.5
Maximum Water Pressure (psi)
640
640
640
ΔT (°F)5
8
8
7
DIMENSIONS
ARWN038GA2, ARWN048GA2, ARWN053GA2
Figure 1: ARWN038GA2, ARWN048GA2, ARWN053GA2 Dimensions.
Y
D
M1
W
X
D
Top View
Isometric
H
L1
L2
L3
L4
L5
L6
L7
L8
M1
Water Outlet
M2
H
Capped Line
L3
Vapor Line
Liquid Line
Z
L
L7
L
L1
10
L2
Front View
X
Y
L6
Water Inlet
Z
L4
L5
MULTI V Water Mini System Installation Manual
W
M2
Side View
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.
REFRIGERANT FLOW DIAGRAMS
ARWN038GA2, ARWN048GA2, ARWN053GA2
Cooling Mode
Figure 2: ARWN038GA2, ARWN048GA2, ARWN053GA2—Cooling Mode.
Indoo r HEX
EEV
Fan
EEV
Indoor HEX
Fan
Filter
Filter
Indoor Unit
Indoor Unit
High Temperature High Pressure Gas
High Temperature High Pressure Liquid
Low Temperature Low Pressure Gas
Water Out
High
Pressure
Switch
HEX
Temp
Plate
Heat Exchanger
4 Way
Valve
Product Data
Water In
High
Pressure
Sensor
Hot Gas
Bypass
Valve
S
Discharge
Temp
Accumu
lator
Fusible
Plug
Low
Pressure
Sensor
Main
EEV
Inv.
Comp.
High
Suction
Temp
Gas
Liquid
Liquid
Temp
Remark
Check
Valve
EEV
S
Solenoid
Valve
Pressure
Sensor
High
Pressure
Switch
Strainer
Thermistor
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.
SVC
Valve
Fusible
Plug
11
REFRIGERANT FLOW DIAGRAMS
ARWN038GA2, ARWN048GA2, ARWN053GA2
Heating Mode
Figure 3: ARWN038GA2, ARWN048GA2, ARWN053GA2—Heating Mode.
Indoor HEX
EE V
Fan
EEV
Indoor HEX
Fan
Filter
Filter
MULTI V Water Mini System Installation Manual
Indoor Unit
Indoor Unit
High Temperature High Pressure Gas
High Temperature High Pressure Liquid
Low Temperature Low Pressure Gas
Water In
Water Out
High
Pressure
Switch
HEX
Temp
Plate
Heat Exchanger
4 Way
Valve
High
Pressure
Sensor
Hot Gas
Bypass
Valve
S
Discharge
Temp
Accumu
lator
Fusible
Plug
Low
Pressure
Sensor
Main
EEV
Inv.
Comp.
High
Suction
Temp
Gas
Liquid
Liquid
Temp
Remark
12
Check
Valve
EEV
S
Solenoid
Valve
Pressure
Sensor
High
Pressure
Switch
Strainer
Thermistor
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.
SVC
Valve
Fusible
Plug
REFRIGERANT FLOW DIAGRAMS
Oil Return Operation
ARWN038GA2, ARWN048GA2, ARWN053GA2
Figure 4: ARWN038GA2, ARWN048GA2, ARWN053GA2—Oil Return.
Indoor HEX
EEV
Fan
Indoor HEX
Fan
Filter
EEV
Filter
Indoor Unit
Indoor Unit
High Temperature High Pressure Gas
High Temperature High Pressure Liquid
Low Temperature Low Pressure Gas
Water Out
Product Data
Water In
High
Pressure
Switch
HEX
Temp
Plate
Heat Exchanger
4 Way
Valve
High
Pressure
Sensor
Hot Gas
Bypass
Valve
S
Discharge
Temp
Accumu
lator
Fusible
Plug
Low
Pressure
Sensor
Main
EEV
Inv.
Comp.
High
Suction
Temp
Gas
Liquid
Liquid
Temp
Remark
Check
Valve
S
EEV
Solenoid
Valve
Pressure
Sensor
High
Pressure
Switch
Strainer
Thermistor
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.
SVC
Valve
Fusible
Plug
13
WIRING DIAGRAM
ARWN038GA2, ARWN048GA2, ARWN053GA2
MULTI V Water Mini System Installation Manual
Figure 5: ARWN038GA2, ARWN048GA2, ARWN053GA2 Wiring Diagram.
8
14
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.
3
ACCESSORIES
Table 4: Required Accessories.
Required Accessories
Y-branches
(for indoor unit connection)
Four (4) branch
ARBL054
ARBL104
Headers
(for indoor unit connection)
Model No.
ARBLN01621
ARBLN03321
Seven (7) branch
ARBL057
ARBL107
Ten (10) branch
ARBL1010
ARBL2010
Y-branches (for indoor unit connection)
Unit: Inch
Table 3: Y-branch Table.
Vapor pipe
Models
I.D. 1/2
Liquid pipe
I.D. 1/2
I.D. 5/8
I.D. 1/4
I.D. 5/8
I.D. 3/8
I.D. 1/4
I.D. 3/8
1
1
I.D. 5/8
2-15/16
I.D. 1/2
I.D. 1/4
2-15/16
11-1/16
11-1/2
11-1/16
11-1/2
Product Data
ARBLN01621
I.D. 3/8
I.D. 1/2
I.D. 3/4
1
1
O.D. 5/8
O.D. 3/8
2-3/4
2-3/4
I.D. 7/8
I.D. 1
I.D. 3/4
I.D. 5/8
I.D. 3/4
1
I.D. 5/8
ARBLN03321
I.D. 3/4
I.D. 7/8
3
1
2-3/4
I.D. 1/2
I.D. 7/8
O.D. 3/4
O.D. 1
3-3/16
I.D. 1
2
I.D. 1/4
3-5/16
3
I.D. 1-1/8
I.D. 3/8
I.D. 3/8
I.D. 1/2
15-3//8
16-1/4
O.D. 3/4
I.D. 1/2
I.D. 1/2
2
I.D. 3/8
I.D. 1/2
I.D. 1/4
2-15/16
12-5/8
13-1/16
4-3/8
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.
15
ACCESSORIES
Headers (for indoor unit connection)
Table 5: Header Table.
Unit: Inch
Models
Vapor pipe
Liquid pipe
14-3/16
14-3/16
4 branch
I.D. 1/2
ARBL054
I.D. 5/8
I.D. 1/2
4-3/4
4-3/4
I.D. 1/4
I.D. 5/8
ARBL057
I.D. 5/8
4-3/4
I.D. 1/2
I.D. 5/8
I.D. 5/8
4 branch
ARBL104
I.D. 5/8
4-3/4
I.D. 1/4
I.D. 3/4
5-15/16
4-3/4
ID15.88(5/8)
I.D. 5/8
I.D. 3/8
I.D. 1/2
4-3/4
I.D. 5/8
I.D. 3/4
5-15/16
4-3/4
I.D. 1
I.D. 3/8
I.D. 3/8
ARBL1010
I.D. 5/8
I.D. 5/8
I.D. 3/4
I.D. 1
5-15/16
4-3/4
I.D. 5/8
I.D. 1/4
4-3/4
I.D. 3/8
I.D. 3/8
I.D. 7/8
I.D. 1/2
5-15/16
I.D. 3/8
27-9/16
7-3/16
ARBL2010
4-3/4
I.D. 1/4
30-9/16
I.D. 1/2
I.D. 3/8
28-3/8
I.D. 1-1/8
10 branch
5-15/16
4-3/4
I.D. 1/2
I.D. 7/8
6-5/16
I.D. 1/2
I.D. 1/4
I.D. 1/4
29-7/8
10 branch
5-15/16
4-3/4
27-9/16
I.D. 1-1/8
I.D. 3/4
I.D. 1-1/4
I.D. 1-3/8
16
I.D. 3/8
I.D 7/8
I.D. 1
6-5/16
ARBL107
I.D. 1/4
I.D. 3/8
22-7/8
ID12.7(1/2)
I.D. 1/2
I.D. 3/8
14-3/16
6-5/16
I.D. 1-1/8
7 branch
5-15/16
4-3/4
I.D. 1/2
15-3/4
I.D. 1/2
I.D. 1/4
I.D. 3/8
5-15/16
4-3/4
I.D. 3/4
I.D. 5/8
I.D. 3/8
21-1/4
4-3/4
I.D. 1/2
5-15/16
4-3/4
I.D. 1/2
21-1/4
7 branch
I.D. 3/8
I.D. 3/8
I.D. 5/8
I.D. 3/4
MULTI V Water Mini System Installation Manual
5-15/16
4-3/4
I.D. 1/4
4-3/4
4-1/4
21-1/2
I.D. 5/8
I.D. 1/4
I.D. 1/4
5-15/16
I.D. 3/8
I.D. 1-1/8
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.
4-3/4
I.D. 3/8
I.D. 3/4
I.D. 5/8
5-15/16
INSTALLATION
Placement Considerations
Selecting the Best Location
The water source unit must be installed indoors in a mechanical room. The mechanical room must be designed such that equipment vibration
or noise does not affect surrounding rooms, and is properly ventilated or conditioned to maintain an acceptable ambient temperature range
between 32°F and 104°F. Mechanical room temperature is required to be maintained between 32°F and 104°F. The water source unit will
reject heat to the mechanical room. See the “General Data” on page 9 for the amount of heat rejected to the equipment room.
•The water source unit must also be located where the refrigerant pipe system is designed within the piping limitations set forth in the Water
Mini Engineering Manual. Location of the water source unit should be strategically located in the building to minimize refrigerant piping
materials, labor, and refrigerant.
•The underlying structure or foundation must be designed per local codes and support the weight of the unit. Units can be stacked above
each other as long as each water source unit is independently supported. Minimum clearances must be maintained either per recommendations shown in Figures 2 and 3 or local codes, whichever is greater. Include enough space in the installation area for service access (refer
to the installation space requirements).
•The water-source unit should be installed with a closed-loop water system. If an open-loop system is used, it is recommended that an
intermediate heat exchanger be installed.
•When piping, towers, or other system components that contain water and are exposed to ambient air temperatures below 32°F, an antifreeze solution must be used. Frozen water will damage the plate heat exchanger. A typical antifreeze solution consists of a proper mixture
of ethylene glycol, propylene glycol, or methanol mixed with water. The designer should also consider the use of a supplemental boiler /
heater to maintain minimum temperatures.
Note:
Avoid exposing the water-source unit to oil, steam, combustible gases, acidic solutions or sprays, carbon fiber, sulfur, or other corrosive gases.
Avoid exposure to electromagnetic waves from EMF radiating machinery such as generators, MRI equipment, or other equipment that emits
electromagnetic energy. The control system may be affected by electromagnetic energy, which may result in abnormal system operation. Also,
the inverter components in the water source units may generate electromagnetic noise, therefore, ensure the water-source unit is placed at an
acceptable distance from computer, audio, and other sensitive electronic equipment. Route power wiring and communications cables in separate conduits.
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.
17
Installation Instructions
•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.
INSTALLATION
Transporting / Lifting the Water Source Unit
Transporting / Lifting
•When lifting the unit, use lifting straps and place around the unit as shown below.
•Always lift the unit using properly sized lifting straps rated to carry the unit weight.
•Ensure the straps are long enough to maintain a maximum of a 40° angle as shown at “A”.
Figure 6: Transporting the Water Source Unit.
MULTI V Water Mini System Installation Manual
A
Table 6: Water Mini Net and Shipping Weights.
Capacity
(ton)
Net Weight
(lbs.)
Shipping
Weight (lbs.)
3.0
168
181
4.0
168
181
4.5
168
181
A
A: ≤40°
B: Mounting Rail
•One person should 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
slippage from the rigging apparatus.
•Do not drop the unit when carrying it with a forklift.
•Use a minimum of three (3) lifting straps.
•Place a protective cloth or other soft material at the locations where the casing comes in contact with the lifting straps to prevent
damage to painted surfaces.
•Always know where the center of gravity of the water source unit is before lifting. Hoist the unit with the center of gravity centered
among the lifting straps.
Caution when using forklift to transport an unpackaged unit. Consider the unit’s center of gravity when lifting. Protect the painted surfaces as
necessary to prevent damage to the unit finish.
18
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
Minimum Space Requirements
Installation Space
When installing the water-source unit, provide service requirements as illustrated. If local code requires additional clearance area, comply
with local codes.
Note:
Job site conditions may require routing utilities—including the refrigerant piping and electrical wiring—under the unit base. If job site conditions
warrant, consider adding mounting rails under the unit.
Figure 7: Required Minimum Space for Water Mini Unit Installation.
Unit: Inch
4
4
Unit: Inch
Installation Instructions
7/8
: Required Minimum Service Area
Figure 8: Stacked Water Source Units.
Service area
(Front)
Plan View
4
Field-Provided H-Beam Support
Front View
42-1/2
20-1/2
Field-Provided H-Beam Support
4
7/8
4
7-1/2
4 4
23-5/8
42-1/2
Water pipe
installation
space
42-1/2
15
Exterior of
Water Source
Unit
Field-Provided H-Beam Support or Floor
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.
19
INSTALLATION
General Mounting / Anchoring the Water Source Unit
General Mounting
Securely attach the water source unit to a concrete pad, base rails, or other mounting platform that is anchored to the building structure.
Avoid placing the unit in a low lying area where water may accumulate. Refer to dimensional drawing in the “Product Data” section on page
10, and follow the applicable local code for clearance, mounting, anchor, and vibration attenuation requirements.
Anchoring the Water Source Unit
Figure 9: Location of the Anchor Bolts.
Unit: Inch
15-1/4
13-15/16
Front
Location of the
anchor bolts
Anti-vibration
Material
Concrete
Base
Unit: Inch
Three Threads
Four Bolts
Required
8
8
3
•Securely fasten all four (4) corners to the
Figure 10: Close up of Anchor Bolts.
supporting base.
Spring Washer
•If not otherwise directed by the structural
Unit
Mounting
engineer or local codes, Use a 7/16 inch or
Nut
Foot
1/2 inch diameter J-bolt. Use a hexagon nut
with a spring washer.
H-Beam
•Include anti-vibration material chosen by the
acoustics engineer.
•Include enough space for refrigerant piping
and electrical wiring when installing through
the bottom of the unit.
•Use an H-beam, concrete support, or other
acceptable support structure designed by a
structural engineer.
Side View
3
Plan View
4
MULTI V Water Mini System Installation Manual
•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.
•Install the water source unit to a base and in a manner approved by the structural engineer to minimize damage to the unit in the event
of an earthquake. Any deficiency in installation may cause unit to fall, resulting in physical injury or death.
Note:
All referenced materials are to be field-supplied. Images are not to scale, are for reference only, and are not intended to be used for design
purposes.
20
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.
REFRIGERANT PIPING DESIGN
Computer-assisted Refrigerant Pipe Design
LATS Multi V Piping Design Software
Figure 11: LATS Pipe System Design Tool in Tree Mode.
The proper design and installation of the refrigerant piping system is
a critical element of the Multi V system. Multi V Water Mini requires
two pipes between system components – a liquid line and a vapor
line. A properly designed refrigerant piping system ensures that
refrigerant is delivered to the evaporator coil’s electronic expansion valve (EEV) in a pure liquid state free of gas bubbles. A proper
design also ensures a sufficient refrigerant gas flow rate in the vapor
line that eliminates the possibility of refrigeration oil from collecting in
the vapor lines.
Refrigerant Piping Quality Assurance
Note:
Any field changes, such as re-routing, shortening or lengthening a pipe segment, adding or eliminating elbows and/or fittings, re-sizing,
adding, or eliminating indoor units, changing the mounting height or moving the location of a device or fitting during installation
should be done with caution and ALWAYS VERIFIED in LATS MULTI V SOFTWARE BEFORE supplies are purchased or installed.
Doing so may lead to a more profitable installation, reduce the potential for rework, and will reduce the potential for multiple visits
to the job site to complete the system commissioning.
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 for high altitude applications. Locally accepted
altitude correction factors must be applied to indoor unit capacities.
Creating a Balanced Piping System
Unlike designing duct-work or chilled and hot water pipe systems where balancing dampers, ball valves, orifices, circuit setters, or other
flow control devices can be installed to modify or balance the flow of cooling medium, these cannot be used in a VRF system. Therefore,
variable refrigerant flow systems have to be designed to be “self balanced.” Balanced liquid refrigerant distribution is solely dependent on
the designer choosing the correct pipe size for each segment. Pipe sizing considerations include pipe length, pipe segment pressure drop
relative to other pipe segments in the system, type and quantity of elbows, bends present, fitting installation orientation, and end use device
elevation differences.
Note:
It is imperative the designer avoids creating excessive pressure drop. When liquid refrigerant is subjected to excessive pressure drop, liquid
refrigerant will change state and “flash” to vapor. Vapor present in a stream of liquid refrigerant before reaching the electronic expansion
valve (EEV) results in a loss of system control and causes damage to the valve. The pipe system must be designed in a manner that avoids
the creation of unwanted vapor.
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.
21
Refrigerant Piping
LG’s LATS Multi V software makes designing the refrigerant system
easy. LATS Multi V is a Windows®-based application that assists the
engineer in the design of the refrigeration distribution pipe system, verifies the design complies with pipe design limitations, applies capacity correction factors, and calculates the system refrigerant charge. The piping system can be entered manually into LATS from a one-line
pipe diagram. To ensure that the refrigerant piping design meets LG’s quality standards, a LATS refrigerant piping design must be
provided with every Multi V Water Mini order. Following the installation, if any changes or variations to the design were necessary,
a new “as-built” LATS piping design software report must be created and provided to LG prior to system commissioning.
Systems that are close to the standard application limits may be converted into a conditional application by field changes to pipe equivalent
lengths. User should always check the LATS report actual pipe layout versus pipe limits. The user may want to increase pipe lengths when
design conditions are approaching the Standard Application Piping Rule limits to force the LATS program to engineer the system using the
“Conditional Application Pipe Rules,” which will increase the diameter of the main and a few branch segments to minimize the possibility of
required pipe changes due to field installation variations.
REFRIGERANT PIPING DESIGN
System Engineering
Device Connection Limitations
•The minimum number of connected and operating indoor units to a Multi V Water Mini system is one, taking into consideration of the minimum combination ratio.
•The maximum number of indoor units on a Multi V Water Mini heat pump systems is:
ARWN038GA2 = 6
ARWN048GA2 = 8
ARWN053GA2 = 9
MULTI V Water Mini System Installation Manual
One of the most critical elements of a Multi V Water Mini system is the refrigerant piping. The table below lists pipe length limits that must be
followed in the design of a Multi V Water Mini refrigerant pipe system:
Table 7: Multi V Water Mini Liquid Refrigerant Pipe Design Limitations.
Longest total 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 indoor unit to Y-branch
Maximum distance between first Y-branch to farthest
indoor unit
≤ 131 feet
Water-source unit above or below indoor unit
≤ 98.4 feet
Between any two indoor units
≤ 49 feet
Pipe Length
(ELF = Equivalent Length of pipe
in Feet)
Elevation (All Elevation
Limitations are Measured in
Actual Feet)
Table 8: Equivalent Piping Length for Y-branches, Headers, and Typical Refrigeration Elbows.
Size (Inches)
Component
Elbow (ft.)
Y-branch (ft.)
1
1/4
3/8
1/2
5/8
3/4
7/8
1
1-1/8
1-1/4
1-3/8
1-1/2
1-5/8
1-3/4
2-1/8
0.5
0.6
0.7
0.8
1.2
1.3
1.5
1.6
1.8
2.0
2.1
2.3
2.5
2.8
1.6
1
Header (ft.)
Kit contains two Y-branches: one for liquid and one for vapor.
22
3.3
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.
REFRIGERANT PIPING DESIGN
System Engineering
Selecting Field-Supplied Copper Tubing
Copper is the only approved refrigerant pipe material for use with LG Multi V commercial air conditioning products, and LG recommends
seamless 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 requirements and be approved for an operating pressure of 551 psi. If local code does not specify wall thickness, LG suggests using tube thickness per table below. When bending tubing, try to keep the number of bends to a minimum,
and use the largest radii possible to reduce the equivalent length of installed pipe; also, bending radii greater than ten (10) pipe diameters
can minimize pressure drop. Be sure no traps or sags are present when rolling out soft copper tubing coils.
Table 9: ACR Copper Tubing Material.
Seamless Phosphorous Deoxidized
Class
UNS C12200 DHP
Straight Lengths
H58 Temper
Coils
O60 Temper
Table 10: Piping Tube Thicknesses.
OD (in)
1/4
3/8
1/2
Material
Rigid Type “K” or “L” and Soft ACR Acceptable
Min. Bend
.563
.9375
1.5
Radius (in)
Min. Wall
.03
.03
.035
Thickness (in)
5/8
3/4
7/8
1-1/8
Rigid Type “K” or “L” Only
2.25
3.0
3.0
3.5
4.0
.040
.042
.045
.050
.050
Refrigerant Piping
Type
1-3/8
Table 11: ACR Copper Tubing Dimensions and Physical Characteristics1-4
Drawn Temper
Annealed Temper
Nominal Pipe Actual Outside
Outside
Nominal
Wall
Cubic
ft
per
Nominal
Wall
Diameter (in)
Diameter (in)
Thickness (in) Weight (lb/ft)
Linear ft
Thickness (in) Weight (lb/ft)
1/4
0.250
---0.030
0.081
3/8
0.375
0.030
0.126
.00054
0.032
0.134
1/2
0.500
0.035
0.198
.00101
0.032
0.182
5/8
0.625
0.040
0.285
.00162
0.035
0.251
3/4
0.750
0.042
0.362
.00242
0.042
0.362
7/8
0.875
0.045
0.455
.00336
0.045
0.455
1-1/8
1.125
0.050
0.655
.00573
0.050
0.655
1
All dimensions provided are in accordance with ASTM B280 – Standard.
2
Design pressure = 551 psig.
3
ACR Tubing is available as hard drawn or annealed (soft) and are suitable for use with R410A refrigerant.
4
The Copper Tube Handbook, 2010, Copper Development Association Inc., 260 Madison Avenue, New York, NY 10016.
Cubic ft per
Linear ft
.00020
.00053
.00103
.00168
.00242
.00336
.00573
Note:
•Commercially available piping often contains dust and other materials. Always blow it clean with a dry inert gas.
•Prevent dust, water or other contaminants from entering the piping during 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.
23
REFRIGERANT PIPING DESIGN
System Engineering
LG Engineered Y-branch Kits and Header Kits
LG Y-branch and Header kits are highly engineered devices designed to evenly divide the flow of refrigerant, and are used to join one pipe
segment to two or more segments.
No Substitutions
Only LG supplied Y-branch and Header fittings (as referenced below; sold separately) can be used to join one pipe segment to two or more
segments. Third-party or field-fabricated Tee’s, Y-fittings, Headers, or other branch fittings are not qualified for use with LG Multi V Water Mini
systems. The only field-provided fittings allowed in a Multi V Water Mini piping system are 45° and 90° elbows.
Table 12: Y-Branches and Headers.
Headers
4 branch
7 branch
10 branch
ARBLN01621
ARBL054
ARBL057
ARBL1010
ARBLN03321
ARBL104
ARBL107
ARBL2010
•If the diameter of the branch pipe segments differ from that of the designated refrigerant piping, trim the to the desired section using a pipe
cutter, and then use an adapter to connect.
•Always follow manufacturer’s guidelines on refrigerant piping restrictions such as maximum length, elevation difference, and diameters. Failure to do so can result in reduced heating / cooling performance or equipment malfunction.
MULTI V Water Mini System Installation Manual
Y-branches
LG Y-branch kits consist of:
LG Header kits consist of:
•Y-branches (liquid line, vapor lines).
•Reducer fittings as applicable.
•Molded clam-shell type insulation covers.
•Two Headers (one liquid line, one vapor line).
•Reducer fittings as applicable.
•Molded clam-shell type insulation covers.
Figure 12: Y-branch Connections.
Y-Branch Kits
To indoor unit
To outdoor unit
LG supplied Y-branches must be used at each transition. Field-supplied “T” fittings or “Y” branches are not acceptable. Each LG supplied Y-branch kit comes
with two (2) Y-branches for indoor units, step-down pipe reducers, and insulation
To indoor unit
covers.
Figure 13: Y-branch Installation Alignment Specification.
Y-branches may be installed in horizontal or vertical configurations. When inVertical down configuration.
Vertical up configuration.
stalled vertically, position the Y-branch so the straight-through leg is ±3° of plumb.
When installed horizontally, position the Y-branch so the take-off leg is level and
shares the same horizontal plane as the straight-through leg ±5° rotation.
There is no limitation on the number of Y-branches that can be installed, but there
is a limitation on the number of indoor units connected to a single water source
unit.
Y-branches should always be installed with the single port facing the water-source
unit, the two-port end facing indoor units (Do not install Y-branches backwards as
shown in Figure 15.) Refrigerant flow cannot make U-turns through Y-branches.
The first Y-branch kit must be located at least three (3) feet from the water source
unit. Provide a minimum of 20
Figure 15: Diagram of an Incorrect Y-branch
inches between a Y-branch and
Installation.
any other fittings or indoor unit
piped in series. It is recommended that when a Y-branch is
located in a pipe chase or other
concealed space, access doors
should be provided for inspecFigure 14: Horizontal Configuration End View.
tion access. The equivalent pipe
±5°
Branch Leg
Straight-through Leg
length of each Y-branch (1.6′)
must be added to each pipe
segment entered into LATS pipHorizontal Plane
ing design software.
or
do
in
To
ch
ran
tb
ex
n
To
it
un
Y-branch Inlet
±5°
24
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.
REFRIGERANT PIPING DESIGN
System Engineering
Y-branch Insulation
Figure 16: Y-branch Insulation and Pipe Detail.
Each Y-branch kit comes with clam-shell type peel-and-stick insulation jackets
molded to fit the Y-branch fittings—one for the liquid line, one for the vapor line.
•Check the fit of the Y-branch clam-shell insulation jacket after the Y-branch is
installed.
•Mark the pipe where the insulation jacket ends.
•Remove the jacket.
•Install field-provided insulation on the three (3) pipes first.
•Peel the adhesive glue protector slip and install the clam-shell jacket over the
fitting.
Header Kits
Note:
Install Correctly
Header kits are intended for use where multiple indoor units are in
Figure 18: Header Kit—Horizontal Rotation Limit (Must be Installed
Level with No Rotation).
the same vicinity and it would be better to “home-run” the run-out
pipes back to a centralized location. If connecting multiple indoor
Largest IDU
units that are far apart, Y-branches may be more economical. See
page 16 for Header kit specifications and capacities.
Header Inlet
+0.0
Y-branches can be installed between the Header and the water
Smaller IDUs
-0.0
source unit, but a Y-branch cannot be installed between a Header
Header End View
and an indoor unit. Headers must be installed in a horizontal and
level position with the distribution ports of the fitting in the same
horizontal plane as the straight-through branch.
When connecting indoor units to a Header, always connect the unit
Connect IDUs
with the largest nominal capacity to the port closest to the water
source unit. Then install the next largest 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 fitting, do not use a Header. Instead, install a Y-branch fitting between the water source unit and the Header fitting,
and connect the elevated indoor unit to the Y-branch.
Header Insulation
Figure 17: Header Insulation and Pipe Detail.
Field supplied copper pipe
Each Header kit comes with clam-shell type peel and stick insulation
jackets molded to fit the Header fittings—one for the liquid line and
one for the vapor line.
Field supplied insulation
Field supplied copper pipe
LG supplied header LG supplied insulation jacket
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.
25
Refrigerant Piping
•Y-branches can be installed upstream between the Header and the water-source unit, but a Y-branch cannot be installed between a
header and an indoor unit.
•To avoid the potential of uneven refrigerant distribution through a header fitting, minimize the difference in equivalent pipe length
between the header fitting and each connected indoor unit.
REFRIGERANT PIPING DESIGN
System Engineering
No Pipe Size Substitutions
Use only the pipe size selected by the LATS Multi V pipe system design software. Using a different size is prohibited and may result in a
system malfunction or failure to work at all.
MULTI V Water Mini System Installation Manual
Obstacles
Figure 19: Installing Piping Above and Below an Obstacle.
When an obstacle, such as an I-beam or concrete T, is in the path
of the planned refrigerant pipe run, it is best practice to route the
pipe over the obstacle. If adequate space is not available to route
the insulated pipe over the obstacle, then route the pipe under the
obstacle. In either case, it is imperative the length of the horizontal
section of pipe above or below the obstacle be a minimum of three
(3) times the longest vertical rise (or fall) at either end of the
segment.
Copper Expansion and Contraction
Under normal operating conditions, the vapor pipe temperature of a
Multi IV system can vary as much as 280°F. With this large variance
in pipe temperature, the designer must consider pipe
expansion and contraction to avoid pipe and fitting fatigue failures.
Refrigerant pipe along with the insulation jacket form a cohesive
unit that expands and contracts together. During system operation,
thermal heat transfer occurs between the pipe and the surrounding
insulation.
If the pipe is mounted in free air space, no natural restriction to
movement is present if mounting clamps are properly spaced and
installed. When the refrigerant pipe is mounted underground in a
utility duct stacked among other pipes, natural restriction to linear
movement is present. In extreme cases, the restrictive force of
surface friction between insulating jackets could become so great
that natural expansion ceases and the pipe is “fixed” in place. In this
situation, opposing force caused by change in refrigerant fluid/vapor
temperature can lead to pipe/fitting stress failure.
The refrigerant pipe support system must be engineered to allow
free expansion to occur. When a segment of pipe is mounted
between two fixed points, provisions must be provided 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 the expansion Loop or U-bend should be. Linear pipe
expansion can be calculated using the following formula:
LE = C x L x (Tr – Ta) x 12
LE
C
L
TR
Ta
12
26
=
=
=
=
=
=
Anticipated linear tubing expansion (in.)
Constant (For copper = 9.2 x 10-6 in./in.°F)
Length of pipe (ft.)
Refrigerant pipe temperature (°F)
Ambient air temperature (°F)
Inches to feet conversion (12 in./ft.)
3X
Above an obstacle.
Below an obstacle.
1. From Table 13, find the row corresponding with the actual length
of the straight pipe segment.
2. Estimate the minimum and maximum temperature of the pipe.
In the column showing the minimum pipe temperature, look up the
anticipated expansion distance. Do the same for the maximum
pipe temperature.
3. Calculate the difference in the two expansion distance values.
The result will be the anticipated change in pipe length.
General Example:
A Multi V system is installed and the design shows that there is a
130 feet straight segment of tubing between a Y-branch and an
indoor unit. In heating, this pipe transports hot gas vapor to the
indoor units at 120°F. In cooling, the same tube is a suction line
returning refrigerant vapor to the water source unit at 40°F. Look up
the copper tubing expansion at each temperature and calculate the
difference.
Vapor Line
Transporting Hot Vapor: 130 ft. pipe at 120°F = 1.54 in.
Transporting Suction Vapor: 130 ft. pipe at 40°F = 0.52 in.
Anticipated Change in Length: 1.54 in. – 0.52 in. = 1.02 in.
Liquid Line
The liquid temperature remains relatively the same temperature; only
the direction of flow will reverse. Therefore, no significant change in
length of the liquid line is anticipated.
When creating an expansion joint, the joint height should be a
minimum of two times the joint width. Although different types of
expansion arrangements are available, the data for correctly sizing
an Expansion Loop is provided in Table 14. Use soft copper with
long radius bends on longer runs or long radius elbows for shorter
pipe segments. Using the anticipated linear expansion (LE) distance
calculated, look up the Expansion Loop or U-bend minimum design
dimensions. If other types of expansion joints are chosen, design
per ASTM B-88 Standards.
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.
REFRIGERANT PIPING DESIGN
System Engineering
See table below for precalculated anticipated expansion for various pipe sizes and lengths of refrigerant tubing.
To find the anticipated expansion value:
1. From the table below, find the row corresponding with the actual feet of the straight pipe segment.
2. Estimate the minimum and maximum temperature of the pipe.
3. In the column showing the minimum pipe temperature, look up the anticipated expansion distance corresponding to the segment length.
Do the same for the maximum pipe temperature.
4. Calculate the difference in the two expansion distance values. The result will be the change in pipe length.
Table 13: Linear Thermal Expansion of Copper Tubing in Inches.
Fluid Temperature °F
Pipe
Length1 35° 40° 45° 50° 55° 60° 65° 70° 75° 80° 85° 90° 95° 100° 105° 110° 115° 120° 125° 130°
10
0.04 0.04 0.05 0.06 0.06 0.07 0.08 0.08 0.09 0.09 0.10 0.10 0.11 0.11 0.11 0.12 0.13 0.14 0.15 0.15
0.08 0.08 0.10 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.21 0.22 0.22 0.23 0.26 0.28 0.29 0.30
30
0.12 0.12 0.15 0.18 0.20 0.21 0.23 0.24 0.26 0.27 0.29 0.30 0.32 0.33 0.32 0.35 0.39 0.42 0.44 0.45
40
0.16 0.16 0.20 0.24 0.26 0.28 0.30 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.43 0.46 0.52 0.56 0.58 0.60
50
0.20 0.20 0.25 0.30 0.33 0.35 0.38 0.40 0.43 0.45 0.48 0.50 0.53 0.55 0.54 0.58 0.65 0.70 0.73 0.75
60
0.24 0.24 0.30 0.36 0.39 0.42 0.45 0.48 0.51 0.54 0.57 0.60 0.63 0.66 0.65 0.69 0.78 0.84 0.87 0.90
70
0.28 0.28 0.35 0.42 0.46 0.49 0.53 0.56 0.60 0.63 0.67 0.70 0.74 0.77 0.76 0.81 0.91 0.98 1.02 1.05
80
0.32 0.32 0.40 0.48 0.52 0.56 0.60 0.64 0.68 0.72 0.76 0.80 0.84 0.88 0.86 0.92 1.04 1.12 1.16 1.20
90
0.36 0.36 0.45 0.54 0.59 0.63 0.68 0.72 0.77 0.81 0.86 0.90 0.95 0.99 0.97 1.04 1.17 1.26 1.31 1.35
100
0.40 0.40 0.50 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.08 1.15 1.30 1.40 1.45 1.50
120
0.48 0.48 0.60 0.72 0.78 0.84 0.90 0.96 1.02 1.08 1.14 1.20 1.26 1.32 1.30 1.38 1.56 1.68 1.74 1.80
140
0.56 0.56 0.70 0.84 0.91 0.98 1.05 1.12 1.19 1.26 1.33 1.40 1.47 1.54 1.51 1.61 1.82 1.96 2.03 2.10
160
0.64 0.64 0.80 0.96 1.04 1.12 1.20 1.28 1.36 1.44 1.52 1.60 1.68 1.76 1.73 1.84 2.08 2.24 2.32 2.40
180
0.72 0.72 0.90 1.08 1.17 1.26 1.35 1.44 1.53 1.62 1.71 1.80 1.89 1.98 1.94 2.07 2.34 2.52 2.61 2.70
200
0.80 0.80 1.00 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00 2.10 2.20 2.16 2.30 2.60 2.80 2.90 3.00
220
0.88 0.88 1.10 1.32 1.43 1.54 1.65 1.76 1.87 1.98 2.09 2.20 2.31 2.42 2.38 2.53 2.86 3.08 3.19 3.30
240
0.96 0.96 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 4.50
320
1.28 1.28 1.60 1.92 2.08 2.24 2.40 2.56 2.72 2.88 3.04 3.20 3.36 3.52 3.46 3.68 4.16 4.48 4.64 4.80
340
1.36 1.36 1.70 2.04 2.21 2.38 2.55 2.72 2.89 3.06 3.23 3.40 3.57 3.74 3.67 3.91 4.42 4.76 4.93 5.10
360
1.44 1.44 1.80 2.16 2.34 2.52 2.70 2.88 3.06 3.24 3.42 3.60 3.78 3.96 3.89 4.14 4.68 5.04 5.22 5.40
380
1.52 1.52 1.90 2.28 2.47 2.66 2.85 3.04 3.23 3.42 3.61 3.80 3.99 4.18 4.10 4.37 4.94 5.32 5.51 5.70
400
1.60 1.60 2.00 2.40 2.60 2.80 3.00 3.20 3.40 3.60 3.80 4.00 4.20 4.40 4.32 4.60 5.20 5.60 5.80 6.00
420
1.68 1.68 2.10 2.52 2.73 2.94 3.15 3.36 3.57 3.78 3.99 4.20 4.41 4.62 4.54 4.83 5.46 5.88 6.09 6.30
440
1.76 1.76 2.20 2.64 2.86 3.08 3.30 3.52 3.74 3.96 4.18 4.40 4.62 4.84 4.75 5.06 5.72 6.16 6.38 6.60
460
1.84 1.84 2.30 2.76 2.99 3.22 3.45 3.68 3.91 4.14 4.37 4.60 4.83 5.06 4.97 5.29 5.98 6.44 6.67 6.90
480
1.92 1.92 2.40 2.88 3.12 3.36 3.60 3.84 4.08 4.32 4.56 4.80 5.04 5.28 5.18 5.52 6.24 6.72 6.96 7.20
500
2.00 2.00 2.50 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.40 5.75 6.50 7.00 7.25 7.50
Pipe length baseline temperature = 0°F. "Expansion of Carbon, Copper and Stainless Steel Pipe," The Engineers' Toolbox, www.engineeringtoolbox.
com.
1
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.
27
Refrigerant Piping
20
REFRIGERANT PIPING DESIGN
System Engineering
Figure 20: Coiled Expansion Loops and Offsets.
L
L
R
L
L
L
L
R
R
R
L
L
R
R
Large Tubing U-bend (>3/4 in.)
MULTI V Water Mini System Installation Manual
L
Loop
Small Tubing U-bend (<3/4 in.)
Table 14: Radii of Coiled Expansion Loops and Developed Lengths of Expansion Offsets.
Anticipated Linear
Expansion (LE) (in)
1/2
R
1
1/4
3/8
Nominal Tube Size (OD) inches
1/2
3/4
1
1-1/4
1-1/2
6
38
9
54
11
66
12
77
14
86
15
94
16
102
17
109
7
44
10
63
12
77
14
89
16
99
17
109
19
117
20
126
8
50
11
70
14
86
16
99
18
111
19
122
21
131
22
140
12
74
17
104
20
127
23
147
26
165
29
180
31
195
33
208
13
80
18
113
22
138
25
160
29
179
31
196
34
212
36
226
L
R1
1
L2
R1
1-1/2
L2
R1
2
L2
R1
2-1/2
L2
R1
3
L2
R1
3-1/2
L2
R1
4
L2
1
R = Centerline Length of Pipe.
2
L = Centerline Minimum Radius (inches).
28
2
9
59
13
83
16
101
19
117
21
131
23
143
25
155
26
166
11
67
15
94
18
115
21
133
24
149
26
163
28
176
30
188
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.
REFRIGERANT PIPING DESIGN
System Engineering
Pipe Bends
When bending soft copper, use long radius bends. Refer to the "Radii of Coiled Expansion Loops and Developed Lengths of Expansion
Offsets” table for minimum radius specifications, page 28.
In-line Refrigeration Components
Components such as oil traps, solenoid valves, filter-dryers, sight glasses, tee fittings, and other after-market accessories are not permitted
on the refrigerant piping system between the water source units and the indoor units. Multi V Water Mini systems are provided with redundant systems that assure oil is properly returned to the compressor. Sight-glasses and solenoid valves may cause vapor to form in the liquid
stream. Over time, dryers may deteriorate and introduce debris into the system. The designer and installer should verify the refrigerant piping system is free of traps, sagging pipes, sight glasses, filter dryers, etc.
Field-provided Isolation Ball Valves
Using Elbows
Field supplied elbows are allowed as long as they are designed for use with R410A refrigerant. The designer and installer, however, should
be cautious with the quantity and size of fittings used, and must account for the additional pressure losses in equivalent pipe length calculation for each branch. The equivalent pipe length of each elbow must be added to each pipe segment in the LATS program. See page 22 for
equivalent lengths.
Installation of Refrigerant Piping / Brazing Practices
Note:
It is imperative to keep the piping system free of contaminants and debris such as copper burrs, slag, or carbon dust during installation.
1. All joints are brazed in the field. Multi V Water Mini refrigeration system components contain very small capillary tubes, small orifices,
electronic expansion valves, oil separators, and heat exchangers that can easily become blocked. Proper system operation depends on
the installer using best practices and utmost care while assembling the piping system.
•Store pipe stock in a dry place; keep stored pipe capped and clean.
Figure 21: Refrigerant Pipe Brazing.
•Blow clean all pipe sections with dry nitrogen prior to assembly.
Refrigerant
Piping
Pressure-reducing
2. Proper system operation depends on the installer using best practices and the
Pipe to
Valve
be brazed
utmost care while assembling the piping system.
•Use adapters to assemble different sizes of pipe.
Nitrogen
•Always use a non-oxidizing material for brazing. Do not use flux, soft solder, or
anti-oxidant agents. If the proper material is not used, oxidized film may accuValve
Taping
mulate and clog or damage the compressors. Flux can harm the copper piping or
refrigerant oil.
•Use a tubing cutter, do not use a saw to cut pipe. De-bur and clean all cuts before assembly.
3. 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 avoid overheating and produce good flow.
•Protect isolation valves, electronic expansion valves, and other heat-sensitive control components from excessive heat with a wet rag or
heat barrier spray.
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.
29
Refrigerant Piping
LG allows the installation of field-supplied ball valves with Schrader ports at each indoor unit. Full-port isolation ball valves with Schrader
ports (positioned between valve and indoor unit) rated for use with R410A refrigerant should be used on both the liquid and vapor lines.
If valves are not installed and a single indoor unit needs to be removed or repaired, the entire system must be shut down and evacuated. If
isolation ball valves are installed, and an indoor unit needs to be repaired, the unaffected indoor units can remain operational. Reclamation
of refrigerant, then, can be restricted to a single indoor unit.
Position valves with a minimum distance of three (3) to six (6) inches of pipe on either side of the valve, and placed between six (6) and
twelve (12) inches from the Y-branch or header connecting the run-out pipe to the upstream main or branch pipe. If ball valves are installed
closer to the indoor unit, a section of pipe becomes a dead zone when the valves are closed where oil may accumulate.
Valves shall be accessible for service. If necessary, install drywall access doors 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.
REFRIGERANT PIPING DESIGN
System Engineering
MULTI V Water Mini System Installation Manual
Pipe Supports
Figure 22: Pipe Hanger Details.
A properly installed pipe system should be adequately supported to avoid pipe sagging. Sagging pipes become oil traps that lead to equipment malfunction.
Pipe supports should never touch the pipe wall; supports shall be installed outside (around) the
primary pipe insulation jacket (see Figure 22). Insulate the pipe first because pipe supports shall
be installed outside (around) the primary pipe insulation jacket. Clevis hangers should be used
with shields between the hangers and insulation. Field provided pipe supports should be designed to meet local codes. If allowed by code, use fiber straps or split-ring hangers suspended
from the ceiling on all-thread rods (fiber straps or split ring hangers can be used as long as they
do not compress the pipe insulation). Place a second layer of insulation over the pipe insulation
jacket to prevent chafing and compression of the primary insulation within the confines of the
support pipe clamp.
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 specify pipe support spacing, pipe shall be supported:
•Maximum of five feet (5′) on center for straight segments of pipe up to 3/4" outside
diameter size.
•Maximum of six feet (6′) on center for pipe up to one inch (1″) outside diameter size.
•Maximum of eight feet (8′) on center for pipe up to two inches (2″) outside diameter size.
Wherever the pipe changes direction, place a hanger within twelve (12) inches on one
side and within twelve to nineteen (12 to 19) inches of the bend on the other side as
shown in Figure 23. Support piping at indoor units as shown in Figure 24. Support YBranch and Header fittings as shown in Figures 25 and 26.
Figure 24: Pipe Support at Indoor Unit.
Figure 25: Pipe Support at Y-branch Fitting.
Max. 12"
Figure 23: Typical Pipe Support Location—
Change in Pipe Direction.
Max. 12"
~ 12" – 19"
Figure 26: Pipe Support at Header Fitting.
Max. 12"
Max. 12"
B
A
Max. 12"
A + B ~ 12" – 19"
Max. 12"
Pipe Slope
The horizontal pipe slope cannot exceed 5° up or down.
Pipe Sleeves and Wall Penetrations
Figure 27: Typical Pipe Penetration.
LG requires that all pipe penetrations through walls, floors, and pipes buried underground
be properly insulated and routed through an appropriate wall sleeve of sufficient size to
prevent compression of refrigerant pipe insulation and free movement of the pipe within
the sleeve. Underground refrigerant pipe shall be routed inside a protective sleeve to
prevent insulation deterioration.
Sealant
Pipe Insulation
Wall Sleeve
30
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.
REFRIGERANT PIPING DESIGN
Pipe Sizing
The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations.
System Using Y-branches
Example: Five (5) indoor units connected
Water-Source Units (WSU).
IDU: Indoor Units.
A: Main Pipe from Water-Source Unit to Y-branch.
B: Y-branch to Y-branch.
C: Y-branch to Indoor Unit.
D: Y-branch to Farthest Indoor Unit.
Y-branch
To Water
Source
Unit
To Indoor
Units
Length: ≤230 feet
ℓ: ≤131 feet
B
Y-branch
C
IDU
D
B
B
C
C
C
IDU
IDU
IDU
Refrigerant Piping
Elevation1: ≤98.4 feet
Note:
•Always reference the LATS Multi V software
report.
Water
Source
Unit
IDU
Elevation2: ≤49 feet
Note:
See pages 32-33 for refrigerant pipe diameter and pipe length tables.
System Using a Header
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.
Note:
Elevation1: ≤98.4 feet
Note:
•Indoor units should be installed at a lower
position than the Header.
•Y-branch pipes cannot be used after
Headers.
•Install the Header so that the pipe distances between the between the connected indoor units are minimized. Large
differences in pipe distances can cause indoor unit performances to fluctuate.
•Always reference the LATS Multi V software
report.
Water Source Unit
Length: ≤230 feet
Header
C
IDU
C
IDU
C
ℓ: ≤131 feet
C
IDU IDU
C
Brazed Cap
D
IDU
Elevation2: ≤49 feet
IDU
See pages 32-33 for refrigerant pipe diameter and pipe length tables.
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.
31
REFRIGERANT PIPING DESIGN
Pipe Sizing
The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations.
System Using Y-branches and Header
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.
To Water
Source
Unit
Y-branch
To Indoor
Units
Header
•Indoor units should be installed at a lower
position than the Header.
•Y-branch pipes cannot be used after
Headers.
•Install the Header so that the pipe distances between the between the connected indoor units are minimized. Large
differences in pipe distances can cause indoor unit performances to fluctuate.
•Always reference the LATS Multi V software
report.
B
C
IDU
First Y-branch
C
IDU
Brazed Cap
C
IDU
Length: ≤230 feet
ℓ: ≤131 feet
D
Second Y-branch
C
IDU
Table 15: Pipe Capabilities.
Longest actual pipe length
Longest Equivalent pipe length1
A + B + D ≤230 feet
A + B + D ≤295.2 feet
Longest pipe length after first branch
ℓ
B + D ≤ 131 feet
Elevation differential (Water-source unit ↔ Indoor unit)
Elevation1
≤ 98.4 feet
Elevation differential (Indoor unit ↔ Indoor unit)
Elevation2
≤ 49 feet
Distance between fittings and indoor units
≥20 inches
Distance between fittings and
≥20 inches
Y-Branches
Distance between two Y-Branches
≥20 inches
Distance between Header and indoor units
≥20 inches
1
For calculation purposes, assume equivalent pipe length of Y-branch is 1.6 feet, and equivalent pipe length of header is 3.3 feet.
Length
Total pipe length
A + ΣB + ΣC + D ≤475.7 feet
IDU
Elevation2: ≤49 feet
Note:
Water Source Unit
Elevation1: ≤98.4 feet
MULTI V Water Mini System Installation Manual
Example: Five (5) indoor units connected
Table 16: Refrigerant Pipe Diameter (B) from Y-branch to Y-branch / Header.
Downstream Total Capacity of IDUs (Btu/h)
Liquid Pipe (Inches O.D.)
Vapor Pipe (Inches O.D.)
≤19,100
Ø1/4
Ø1/2
< 54,600
Ø3/8
Ø5/8
≤76,400
Ø3/8
Ø3/4
Note:
•Connection piping from branch to branch cannot exceed the main pipe diameter (A) used by the water-source unit.
•Y-branches and other header branches cannot be installed downstream of the initial header branch.
32
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.
REFRIGERANT PIPING DESIGN
Pipe Sizing
The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations.
Selecting the 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).
Figure 28: Selecting Refrigerant Piping.
Water Source Unit
Gas Pipe
Liquid Pipe
Branch Piping
Main Pipe
B
A
Header
Header
C
C
C
IDU
IDU
Refrigerant Piping
Branch Piping
C
IDU
IDU
Branch Piping
B
B
C
IDU
Table 17: Size of Main Pipe (A) (From Water-Source Unit to Y-branches).
Water-Source Unit Capacity (Btu/h)
Liquid Pipe (Inches O.D.)
C
IDU
C
IDU
Gas Pipe (Inches O.D.)
37,500
Ø3/8
Ø5/8
49,500
Ø3/8
Ø5/8
54,600
Ø3/8
Ø3/4
Indoor Unit Capacity (Btu/h)
Liquid Pipe (Inches O.D.)
Gas Pipe (Inches O.D.)
19,100
Ø1/4
Ø1/2
54,600
Ø3/8
Ø5/8
76,400
Ø3/8
Ø3/4
Indoor Unit Capacity (Btu/h)
Liquid Pipe (Inches O.D.)
Gas Pipe (Inches O.D.)
19,100
Ø1/4
Ø1/2
54,600
Ø3/8
Ø5/8
Table 18: Size of Branch Piping (B) to Branch Piping (B).
Table 19: Size of Branch Piping to Indoor Unit (C).
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.
33
REFRIGERANT PIPING DESIGN
Pipe Sizing
Various Acceptable Layouts
MULTI V Water Mini System Installation Manual
First
Third Main Pipe
Distribution
Second
First
Second
First
Second
First Main Pipe
Distribution
Second Main Pipe
Distribution
Header
Unacceptable Piping System Layouts
A second branch cannot be installed after a
header.
34
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.
REFRIGERANT PIPING DESIGN
Refrigerant Pipe Connections
Figure 29: Water Mini Unit Front Panel.
Before connecting the piping:
•Remove the front panel.
•Check all pipes (liquid and vapor).
Capped
3/4 Vapor Pipe
3/8 Liquid Pipe
Water Mini Unit Service Valves
1. Field piping.
2. Flare nut.
3. Ball type service valves.
4. Schrader valves.
5. Liquid pipe.
6. Vapor pipe.
Figure 30: Service and Schrader Valve Detail.
7. Field-supplied 90°
elbow.
3
Refrigerant Piping
Note:
Do not expose the service valves of the water source unit to heat. Protect the service valve with a
wet towel during brazing.
Operating the Service Valves
2
1. Loosen or tighten the flare nut by using a torque wrench and backup wrench. Coat the flare
connection with polyvinyl ether (PVE) refrigeration oil.
2. Remove service valve cap. To operate the shutoff valve, turn ball valve stem 90° using an
open-end wrench. Always backseat the valve. After operation, always replace the caps (Tightening torque of service valve cap: =18.0 lb-ft).
3. Evacuate the system, and then charge the refrigerant using the Schrader valve. Reattach the
Schrader valve cap after servicing is complete. (Tightening torque of service cap: =10.0 lb-ft).
•The unit ships with a factory charge of
refrigerant. When connecting and brazing the vapor line, protect the service
and Schrader valves from excessive
heat using a wet rag or cooling gel
product.
•After connections are complete, verify
that the service ports and caps are
securely tightened to prevent leaking
refrigerant gas.
Note:
4
1
6
5
Liquid Pipe Service Port
7
Vapor Pipe Service Port
Figure 31: Service Valves - Open and Closed Positions.
Cut length of pipe and valve as desired,
but length must be a minimum of 2-3/4 inches.
Indicates “open” when the pipe and
the “flats” of the valve stem are parallel.
CLOSE
OPEN
•When connecting the refrigerant piping, make sure the service valves of the water source unit are completely closed (factory setting). Do not open the service valves or
attempt to operate 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 Commissioning Agent 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 system malfunction.
•Use steel wool or comparable material to fill gaps between the unit case and the refrigerant and electrical connections to prevent rodent and animal entry.
•Always take extreme caution to prevent refrigerant gas (R410A) from leaking during use, around fire or flame, and during brazing. If the refrigerant gas comes in contact
with a flame from any source, it may break down and generate a poisonous gas. Never braze in a room that is not ventilated. After refrigerant piping work is complete,
securely tighten both service and Schrader valves to help prevent refrigerant gas from leaking. Verify the system is free of leaks after refrigerant piping installation is
complete.
•Do not attempt to remove the service valve stem and packing or Schrader valve core. Physical injury or death may occur from the uncontrolled rapid release of refrigerant.
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.
35
REFRIGERANT PIPING DESIGN
Refrigerant Pipe Connections
•Do not allow the refrigerant to leak during brazing; if the refrigerant combusts, it generates a toxic gas.
•Do not braze in an enclosed location, and always test for gas leaks before / after brazing.
MULTI V Water Mini System Installation Manual
Water Mini Pipe Connections
1. Do not use kinked pipe caused by excessive bending in one specific area on its length.
2. Braze the pipes to the service valve pipe stub of the water source unit.
3. After brazing, check for refrigerant gas leaks.
4. When selecting flare fittings, always use a 45° fitting rated for use with high pressure refrigerant R410A. Selected fittings must also
comply with local, state, or federal standards.
Creating a Flare Fitting
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 down to
avoid introducing foreign materials in the pipe.
2B. Slide the flare nut onto the copper tube.
3. Flaring the pipe end.
•Use the proper size flaring tool to finish flared connections as
shown.
•ALWAYS create a 45° flare when working with R410A.
4. Carefully inspect the flared pipe end.
•Compare the geometry with the figure to the right and dimensions
as detailed in Figure 32.
•If the flare is defective, cut it off and re-do procedure.
•If flare looks good, blow clean the pipe with dry nitrogen.
1. Copper
tube
Pipe
2A.
Bar
"A"
A
2
R=0.4~0.8
36
Table 20: Flared Connection Dimensions.
Pipe
Indoor unit
Vapor
(in.
Liquid (in.
(Btu/h)
O.D.)
O.D.)
≤19,100
1/2
1/4
<54,600
5/8
3/8
≤76,400
3/4
3/8
Copper
tube
Bar
Copper pipe
Clamp handle
4.
Handle
Yoke
Red arrow
Inside is shiny with no scratches
Smooth
Incorrect Flares
Even length
45°
Flare nut
Cone
Figure 32: Dimensions of the Flare.
90° 2
2B.
Reamer
Point
down
3.
Slanted Uneven Rough
90°
Slanted Damanged Cracked Uneven
surface
thickness
“A”
Vapor (in.)
Liquid (in.)
5/8 ~ 11/16
5/8 ~ 11/16
3/4 ~ 13/16
7/16 ~ 1/2
5/8 ~ 11/16
5/8 ~ 11/16
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.
REFRIGERANT PIPING DESIGN
Refrigerant Pipe Connections / Insulating the Refrigerant Piping
Tightening the Flare Nuts
Figure 33: Tightening the Flare Nuts.
Table 21: Tightening Torque for Flare Nuts.
Pipe size (Inches O.D.)
3/8Ø
1/2Ø
5/8Ø
Tightening torque (ft-lbs)
24.1 - 29.4
36.5 - 44.5
45.5 - 55.6
Width of the flare (A [inches])
1/2
5/8
3/4
Union
1. When connecting the flare nuts, coat the flare (inside and outside) with polyvinyl ether (PVE)
refrigeration oil only.
Note:
Do not use polyolester (POE) or any other type of mineral oil as a thread lubricant. These lubricants are not compatible with PVE oil used in
this system and create oil sludge leading to equipment damage and system malfunction.
2. Initially hand tighten the flare nuts using three (3) or four (4) turns.
3. To finish tightening the flare nuts, use both a torque wrench and a backup wrench.
4. After all the piping has been connected and the caps have been tightened, check for refrigerant gas leaks.
Always use two (2) wrenches to loosen the flare nuts.
Refrigerant 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 ball valves, service valves, and elbows must be
completely insulated using closed-cell pipe insulation. All insulation joints must be glued with no air gaps. Insulation material must fit snugly
against the refrigeration pipe with no air space between it and the pipe. Insulation passing through pipe hangers, inside conduit, and/or
sleeves must not be compressed. Protect insulation inside hangers and supports with a second layer. All pipe insulation exposed to direct
sunlight and deterioration-producing elements must be properly protected with a PVC-aluminum vapor barrier jacket, or alternatively placed
in a weather-resistant enclosure such as a pipe rack with a top cover. The design engineer should perform calculations to determine if the
factory-supplied insulation jackets have sufficient thickness to meet local codes and to avoid sweating at jobsite conditions. Maximum refrigerant pipe temperature is 227°F; minimum refrigerant pipe temperature is -4°F. Add additional insulation if necessary.
Figure 34: Typical Pipe Insulation,
Power Wire and Communications
Cable Arrangement.
D
C
Figure 35: Typical Insulation ButtJoint at Indoor Unit Casing.
Figure 36: Typical Refrigerant
Flare Fitting Insulation Detail.
D
A
B
E
A Liquid Pipe
B Gas Pipe
C Power Wiring
D Insulation
Surface of
Indoor Unit Casing
Field-Provided
Pipe Insulation
E Communication Cables
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.
37
Refrigerant Piping
Loosening the Flare Nuts
REFRIGERANT PIPING DESIGN
Insulating the Refrigerant Piping
Note:
Always properly insulate the piping. Insufficient insulation will result in condensation, reduced heating/cooling performance, etc. Also, if the pipes
aren't insulated properly, condensation could potentially cause damage to building finishes. Pay special attention to insulating the pipes installed
in the ceiling plenum.
Note:
Follow locals codes and the designer’s instructions when selecting EPDM insulation wall thickness.
MULTI V Water Mini System Installation Manual
Table 22: Minimum Refrigerant Pipe EPDM Insulation Wall Thickness Requirements.1
Classification / Piping O.D.
Air-conditioned location
1. Typical Conditioned
2. Special Conditioned
Location
Location
Non-air conditioned location
3. Typical Unconditioned 4. Special Unconditioned
Location
Location
ø1/4 inches
>1/2 inches
>1/2 inches
>1/2 inches
ø3/8 inches
≥ø1/2 inches
>1/2 inches
>1/2 inches
>1/2 inches
ø3/8 inches
ø1/2 inches
ø5/8 inches
>1/2 inches
ø3/4 inches
>3/4 inches
>3/4 inches
ø7/8 inches
ø1 inch
Vapor pipe
ø1-1/8 inches
ø1-1/4 inches
ø1-3/8 inches
>3/4 inches
>1 inch
>1 inch
ø1-1/2 inches
ø1-3/4 inches
1
The thickness of the above insulation material is based on heat conductivity of 0.61 Btu/in/h/ft2/°F.
Liquid pipe
>1/2 inches
>1/2 inches
>1 inch
1. Typical Conditioned Location
A building plenum or space that contains conditioned air that does not exceed 80°F DB.
2. Special Conditioned Location
1. When the location is air conditioned, but there is severe temperature/humidity difference due to high ceilings
•Church, auditorium, theater, lobby, etc.
2. When the location is air conditioned, but internal temperature/humidity are high
•Bathroom, swimming pool, locker room, etc.
3. Typical Unconditioned Location
An unconditioned space inside a building.
4. Special Unconditioned Location: If conditions 1 and 2 below are present.
1. An unconditioned space or plenum of a building.
2. An area where there is an elevated humidity level.
5. Additional Insulation for Indoor Units May be Required in Humid Environments.
The air conditioner factory insulation has been tested according to “ISO Conditions with Mist,” and it satisfies the requirements. 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 248°F.
38
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.
REFRIGERANT PIPING DESIGN
Insulating the Refrigerant Piping
Applying Insulation to Y-Branch and Header Fittings
Check the fit of the insulation jacket provided with the LG Y-branch and Header kits after all pipes are brazed to fittings. Mark all pipes at the
point where the insulation jacket ends. Remove the jacket. Install field-supplied insulation on the pipe segments first, and then install the LG
provided insulation plugs on the ends of all unused Header ports. Apply the clam-shell insulation on jackets to Y-branch and Header fittings
last. Peel the adhesive glue protector slip from the insulation jacket and install the clam-shell jacket over the fitting.
Figure 39: Y-Branch Insulation.
Tape
(field supplied)
Insulator
(included with kit)
Liquid and vapor
pipe joints
Refrigerant Piping
Figure 40: Header Insulation.
Insulator for
field piping
Figure 37: Joints between branch and pipe should be sealed
with tape included in each kit.
Tape
Insulate the header using
the insulation attached to
the branch pipe kit as shown.
Insulator
Field pipe
insulator
Figure 38: Cap pipes should be insulated using the insulator included in each kit, and then taped as shown.
Pipe Insulator Cap
(included with Header Kit)
Capped pipe
Tape
Note:
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 heatresistance factor of more than 248°F.
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.
39
REFRIGERANT PIPING DESIGN
Pressure Testing
Note:
Open all isolation valves that may have been installed in the piping system. Water source unit service valves must remain closed.
Perform a Pressure (Leak) Test
MULTI V Water Mini System Installation Manual
Use medical grade dry nitrogen, and pressure 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 and including the indoor units. If the test is successful the run-out pipes and indoor units 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
40
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.
WATER CIRCUIT INSTALLATION
Water Circuit Design
Design Steps
The Multi V Water Mini unit will require a water cooling / heating source. This year-round heating and cooling system will use a two (2) pipe
closed loop water circuit which circulates water continuously and maintains water temperature between 50°F and 113°F for cooling mode,
23°F and 113°F for heating mode. See capacity tables provided in the Multi V Water Mini Engineering Manual for performance at different
entering water temperatures. At the high end of this temperature range, heat is rejected through a cooling tower (dry cooler or 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
Figure 41: Cooling Cycle Diagram.
Figure 42: Heating Cycle Diagram.
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.
41
Water Circuit Installation
The Multi V Water Mini units have factory installed stainless steel plate heat exchangers. In order to protect these heat exchangers, it is
recommended to use closed cooling towers. If open cooling towers or other open loop systems are used, an intermediate heat exchanger
should be added to protect the water cooled unit from contaminants and debris in the water system that may foul or clog the heat exchanger.
Open loop systems without an intermediate heat exchanger are not recommended due to risk of freezing, reduction of flow due to scaling or
clogging, or other potential problems caused by improper water quality.
WATER CIRCUIT INSTALLATION
Water Circuit Design
Figure 43: Open-Type and Closed-Type Tower Design Schematic.
Open-Type
Cooling Tower
MULTI V Water Mini System Installation Manual
First Side
Second Side
Closed-Type
Cooling Tower
Heat Exchanger
Open-Type Cooling Tower + Heat Exchanger
Heat exchanger is installed between the cooling tower and water
source unit system piping, and the temperature difference between
the first and second sides is maintained constantly.
Closed-Type Cooling Tower
Heat-source water of the cooling tower is supplied directly to the
water source unit system.
Note:
When using an open cooling tower or open geothermal wells, an intermediate heat exchanger is recommended to be installed to protect the water
source unit from contamination.
Expansion Tank
All closed loop systems should have a bladder type expansion tank installed. The expansion tank will protect the equipment from excess
pressures due to expansion and contraction of water in the loop as the temperature changes.
Heat Source and Storage Tank
There are several sources for heat that can be used for this system. They include the following:
•Electric boiler
•Gas boiler
•Solar heat with storage tanks
•Ground source heat
•Steam heat from remote central plant
To deal with thermal flux of the system, if floor space is allowed, a heat storage tank can be installed. The heat storage tank can store
surplus heat or store heat at nighttime when electric rates are lower. Closed type storage tanks are recommended to prevent contamination
of the water system.
Geothermal Water Circuit Design
In lieu of a cooling tower / boiler, Multi V Water Mini units may use a geothermal system that is properly sized to match the water cooled unit
capacity. This year round heating and cooling system will utilize a two (2) pipe closed loop water circuit that circulates water continuously,
maintaining water temperatures between 23°F and 113°F for heating, 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. Should open geothermal systems be used, an intermediate heat exchanger should be installed to isolate
Multi V Water Mini units from contaminants in the water system. Open geothermal loops may contain minerals, biological contaminants,
corrosive agents, or other substances which can cause scale, fouling or corrosion, that could degrade performance or shorten the life of the
heat exchanger and unit.
Antifreeze can be used for all geothermal applications. Refer to antifreeze information on page 44 for recommended levels of antifreeze and
correction factors.
42
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.
WATER CIRCUIT INSTALLATION
Piping System Specifications
Piping System
Other considerations:
•Inhibitors should be used in the water loop, especially if water temperature operates above 104°F.
•Maintain water quality requirements.
Figure 44: Typical connections for water cooled units (all components shown here are field-supplied).
Water Inlet
Pipe
Water Outlet
Pipe
Water Balancing Valve
Gate Valve
Pressure
Gauge
Pressure
Gauge
Temperature
Gauge
PT Service Port
(For Cleaning
Heat Exchanger)
Temperature
Gauge
Flow Switch
Dielectric
Pipe Union
Refrigerant
Pipes
Flex
Connector
Strainer
(50 Mesh)
Flex
Connector
Gate Valve
Dielectric
Pipe Union
Note: Before startup, remove the factory jumper at the flow switch
terminals and install a field supplied flow switch.
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.
43
Water Circuit Installation
As shown on the "Typical connections for water cooled units" diagram below, the following components should be installed at each Multi V
Water Mini unit (field supplied):
•Flow switch at outlet in the 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.
•Strainer with minimum 50 mesh screen at inlet. Clean the mesh screen twenty-four (24) hours after startup, and then clean regularly to
prevent water flow blockage.
•A water balancing valve, circuit setter, or flow control valve to regulate proper water flow to each WSU.
•Dielectric pipe unions to prevent the possibility of galvanic corrosion.
•Pressure gauges at inlet and outlet.
•Thermometers at inlet and outlet.
•Flexible connectors at inlet and outlet.
•Shutoff valves at the inlet and outlet to permit service of the WSU.
•Condensate drain trap per local code.
•Service port with hose connections at inlet and outlet to flush the WSU heat exchanger when isolated from the water loop system.
WATER CIRCUIT INSTALLATION
Piping System Specifications
The piping system should be protected from freezing during winter conditions. Heating mode of the water cooled unit will reduce water loop
temperature and methods should be taken to prevent slush from forming and / or freezing of the loop water. In applications with leaving
water temperatures below 40°F, freeze protection should be considered. Use of ethylene glycol, propylene glycol, or methanol is acceptable.
Recommended levels of concentration (shown below) should be followed, however, the addition of antifreeze may lower the performance of
the water cooled unit due to reduced heat transfer and added pressure drop.
1. Find the corresponding correction factor from table below.
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.
Antifreeze Type
Item
Methanol
Ethylene Glycol
Propylene Glycol
10%
0.998
0.995
1.023
0.996
0.993
1.024
0.993
0.986
1.040
Cooling
Heating
Pressure Drop
Cooling
Heating
Pressure Drop
Cooling
Heating
Pressure Drop
20%
0.997
0.99
1.057
0.991
0.985
1.068
0.987
0.973
1.098
Figure 45: Cooling Capacity Correction Factor Chart.
1.000
0.990
0.990
0.980
0.980
0.970
0.960
40%
0.993
0.979
1.122
0.983
0.969
1.188
0.974
0.948
1.273
50%
0.992
0.974
1.160
0.979
0.961
1.263
0.968
0.935
1.405
0.970
0.960
0.950
0.950
Methanol
Ethylene glycol
Prlpylene glycol
0.940
Methanol
Ethylene glycol
Prlpylene glycol
0.940
0.930
0.930
0%
10%
20%
30%
Antifreeze % by wt
44
Antifreeze % by Weight
30%
0.995
0.995
1.091
0.987
0.997
1.124
0.98
0.96
1.174
Figure 46: Heating Capacity Correction Factor Chart.
1.000
Correction Factor
Correction Factor
MULTI V Water Mini System Installation Manual
Freeze Protection
40%
50%
0%
10%
20%
30%
Antifreeze % by wt
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.
40%
50%
WATER CIRCUIT INSTALLATION
Piping System Specifications
Water Quality Requirements
Impurities in the water can influence the performance and life expectancy of the water cooled unit. The water should be tested and treated
using a local water treatment professional. The following levels should be maintained:
Table 24: Minimum Water Quality Requirements.
Basic Item
Closed Type System
Circulating Water
Supplemented Water
Calcium Hardness (mg CaCO3/ℓ)
Ionic-static silica (mg SiO2/ℓ)
Reference Item
Iron (mg Fe/ℓ)
Copper (mg Cu/ℓ)
Sulfate ion (mg SO42/ℓ)
Ammonium ion (mg NH4+)ℓ
Residual chlorine (mg Cl/ℓ)
Free carbon dioxide (mg CO2/ℓ)
Stability index
1
Scale1
7.0 ~ 8.0
Below 30
Below 50
Below 50
Below 50
Below 70
7.0 ~ 8.0
Below 30
Below 50
Below 50
Below 50
Below 70
Below 50
Below 50
●
Below 30
Below 30
●
Below 1.0
Below 1.0
Must not be detected
Below 0.3
Below 0.25
Below 0.4
Below 0.3
Below 0.1
Must not be detected
Below 0.1
Below 0.3
Below 4.0
The “●” mark for corrosion and scale means that there is a possibility of occurrence.
●
●
●
●
Effect
●
●
●
●
●
●
●
●
●
●
●
●
Water Circuit Installation
pH (77°F)
Conductivity (77°F) mS/m
Chlorine ions (mg Cl-/ℓ)
Sulfate ions (mg SO42/ℓ)
Acid consumption (pH4.8) (mgCaCO3/ℓ)
Total Hardness (mg CaCO3/ℓ)
Corrosion
1
●
●
Note:
•Inhibitors should be used in the water loop, especially if water temperature operates above 104°F.
•Air shall be purged from the system.
Pipe Insulation
Water pipe insulation is suggested in the following conditions:
•Where water pipe is subject to freezing.
•Water pipe where water can condense on surface of pipe from ambient room temperatures higher than temperature of water in the pipe. If
water temperature is maintained at 68°F in winter and 86°F in summer, insulation will not be required.
•On boiler water pipes to save energy losses from heat source.
•On condensate drain lines.
•Where required by local code.
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.
45
WATER CIRCUIT INSTALLATION
Piping System Specifications
Device Protection Details
MULTI V Water Mini System Installation Manual
Strainer on Water Pipe
Figure 47: Potential Heat Exchanger Damage.
To protect the water source unit, a strainer with ≥50 mesh must be
3. Damage
2. Partially frozen
1. Scale and mineral deposits
installed on the water source unit inlet piping. If not installed, the
(cross contamination)
heat exchanger can be damaged by particles in the water supply.
1. The water-supply circuitry within the plate-type heat exchanger
Heat Source
Refrigerant
(Water)
is comprised of many small paths / channels.
2. If a strainer with 50 mesh or more is not included, foreign
particles can partially block the water flow.
3. When the system operates in heating, the plate-type heat
exchanger functions as an evaporator, therefore, the temperature of the coolant supply drops the temperature of the heat
source water supply, which can result in ice forming in the water circuitry.
4. As heating operation progresses, the channels can be partially frozen, which may damage the plate-type heat exchanger.
5. If the heat exchanger is damaged, the coolant supply and the heat-source water supply will mix, and the system will not function.
Flow switch
•It is recommended to install a flow switch on the water pipes that are connected to the water source Figure 48: Flow Switch Schematic.
unit.
Cover
•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 presMicro-switch
Adjustment screw
ent after installing the flow switch, the water source unit will display a CH24 error code and will stop
Vibration plate
operating.)
Bellows
•When setting the flow switch, it is recommended to use the default set value of the water source unit to
1 inch or
satisfy the minimum flow rate.
3/4 inch
(Minimum flow rate range is 50%; Reference flow rate: 3-ton - 10.6 gpm, 4-ton - 13.2 gpm, 4.4-ton socket
15.9 gpm.)
•Select a flow switch following the pressure specification of the water supply system.
Note:
•If the set value does not satisfy the minimum flow rate, or if the set value is changed by the user
arbitrarily, it can result in performance deterioration or system failure.
•If the water source unit operates with a hard water supply, the heat exchanger can be damaged
or system failure can occur.
•If the water source unit displays a CH24 or CH180 error code, it is possible that the interior of the
plate-type heat exchanger is partially frozen. If this occurs, resolve the partial freezing issue and
then operate the water source unit again. (Causes of partial freezing: Insufficient heat water flow
rate, water not supplied, insufficient coolant, foreign particles inside plate-type heat exchanger.)
46
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.
Pad
WATER CIRCUIT INSTALLATION
Flow Switches and Solenoid Valve Wiring
See diagrams below for suggested flow switch wiring. Also shown is wiring for solenoid valves (optional) to turn water flow on / off to the unit.
Figure 51: Water Solenoid Valve Controlled by Building Management System (BMS).
Water
In
Water
Out
C_Box
CN_26
MAIN PCB
CN_24
CN_22
Flow Switch
INTERNET
L1
L2 3(A) 3(B) 4(A) 4(B)
DDC
Water Circuit Installation
Solenoid
Valve
BMS
Figure 50: Water Solenoid Valve Controlled by Water Source Unit.
Water
In
Water
Out
C_Box
CN_26
MAIN PCB
CN_24
CN_22
Flow Switch
L1
Solenoid
Valve
L2 3(A) 3(B) 4(A) 4(B)
Figure 49: Set the DIP switches as below and turn on the power (For water solenoid valve controlled by water source unit).
ON
ON
OFF
1
2
3
4
5
6
7
OFF
1
2
3
4
5
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.
6
7
47
WATER CIRCUIT INSTALLATION
MULTI V Water Mini System Installation Manual
Flow Switches and Solenoid Valves
•The flow switch must be installed at the horizontal pipe of the water source unit's heat
water-supply outlet. Verify the direction of the water flow before installation. (Picture 1)
•Remove the jumper wire and connect to the communication terminals (4[A] and 4[B]) of
the water source unit's control box. (Pictures 2, 3) Open the flow switch cover and check
the wiring diagrams before connecting the wires. Wiring methods can vary by flow switch
manufacturer.
•If necessary (and after consulting with 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.)
Picture
Picture11
Note:
•If the product operates while the flow switch contact point is out of the
permitted range, it can result in performance deterioration or system failure.
•A normally closed type of flow switch must be used.
Picture
Picture22
Solenoid Valves (Optional)
Solenoid valves may be installed to shut off water flow to the water source unit when the
unit turns off. Solenoid valves are field supplied, must be rated for 208-230V, and shall be
wired to terminals L1 and L2 on the water source unit PCB.
Note:
3(B)
Field-supplied solenoid valve must be a normally closed type.
Picture33
Picture
Picture 4
48
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.
4(A)
4(B)
WATER CIRCUIT INSTALLATION
Variable Water Flow Control Kit
Variable Water Flow Control Kit (Model No. PRVC1) allows connection of Multi V Water Mini units to a variable pumping condenser water
systems. The control board, transformer, and wiring provide connections to a field-supplied modulating water valve.
Variable Water Flow Control Kit Parts (included)
Variable Water
Flow Control PCB
Transformer
Water Circuit Installation
Cable Assembly
Terminal Block Assembly
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 (DC 0~10V)
3. CN_OUT: Water source unit connector
4. BUS_A: RS-485 (+) terminal
5. BUS_B: RS-485 (-) terminal
6. SWDIP: Switch to select main function
7. SW1: Reset switch
Figure 52: Variable Water Flow Control Kit PCB Diagram.
6
7
1
4
5
3
2
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.
49
WATER CIRCUIT INSTALLATION
Variable Water Flow Control Kit
MULTI V Water Mini System Installation Manual
Installation
1. Shut off the main power to the water source unit.
2. Install the Variable Water Flow Control (VWFC) PCB in the control box by using the included screws.
3. Install the transformer in the control box by using the included screws.
4. Install the terminal block in the control box by using the included screws.
5. Connect the Main PCB (CN41) to the VWFC (CN_OUT) by using the cable assembly.
6. Connect the blue wire of transformer to the Main PCB (JIG1[L], JIG2[N]).
7. Connect the red wire of transformer to the terminal block (two-pin, yellow terminal block).
8. Connect a power cable (DC 12V) to CN_PWR (12V, GND) of the VWFC.
9. Connect a signal 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 (BUS_A, BUS_B) of VWFC.
13.Set the main function dip switch of the VWFC PCB.
14.Set the dip switch of the water source unit main PCB.
15.Turn on the main power to the water source unit.
16.Check the signal of water flow control valve to CN_AO (AO_01, GND) of VWFC, and check the water flow rate.
Figure 53: Control Kit within the Water Mini Unit.
1: Terminal block
2: Transformer
3: VWFC PCB
1
2
3
Note:
• Install the product on a flat surface with the enclosed screws, otherwise, the VWFC PCB may not be anchored properly.
• Do not damage the case of the Variable Water Flow Control Kit as it may cause the PCB to malfunction.
50
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.
WATER CIRCUIT INSTALLATION
Variable Water Flow Control Kit
Variable Water Flow Control Kit Wiring Diagram
Figure 54: Variable Water Flow Control Kit Wiring Diagram.
Water Circuit Installation
Water Mini Unit
Main PCB
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.
51
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.
DC12V or DC15V
GND
MULTI V Water Mini System Installation Manual
Water-source
Unit PCB
When wiring an external power source.
DC12V
GND
Power Source
Note:
• 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 use of an external power source is recommended.
52
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.
WATER CIRCUIT INSTALLATION
Variable Water Flow Control Kit
Wiring for the Variable Water Flow Control Kit Power Source PCB and
Transformer
Figure 55: Variable Water Flow Control Kit Power Source PCB and Transformer Wiring.
Water Circuit Installation
Note:
• 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.
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.
53
WATER CIRCUIT INSTALLATION
Variable Water Flow Control Kit
Wiring for the Variable Water Flow Control Kit Valve
MULTI V Water Mini System Installation Manual
Figure 56: Variable Water Flow Control Kit Wiring.
AC 24V Power
Source for Variable
Water Flow Valve
Slave Master
DC 0~10V Control
Signal for Variable
Water Flow Valve
Note:
• 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.
54
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.
WATER CIRCUIT INSTALLATION
Variable Water Flow Control Kit
Variable Water Flow Control Kit DIP Switch Settings
Using ‘SWDIP’, select the control function using the DIP switches as described below.
Figure 57: DIP Switch Setting.
ON
OFF L1 2 3 4
Default is L1: ON, L2: OFF.
Water Circuit Installation
Table 25: Output Signal Setting.
DIP Switch Setting
ON
OFF
ON
OFF
ON
OFF
ON
OFF
L1 2 3
4
L1 2 3
4
L1 2 3
4
L1 2 3
4
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)
Table 26: RS-485 Communication Function Setting.
DIP Switch Setting
ON
OFF
ON
OFF
L1 2 3
4
L1 2 3
4
Function
RS-485 communication function enable
RS-485 communication function disable
Note:
• After the DIP switch is changed, the 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.
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.
55
WATER CIRCUIT INSTALLATION
Variable Water Flow Control Kit
Water Source Unit DIP Switch Settings
SW01B
SW02B
ON
ON
MULTI V Water Mini System Installation Manual
OFF
1 2
3 4 5
6 7
OFF
1 2
3 4 5
6 7
Table 27: Water Source Unit DIP Switch Settings.
DIP Switch Setting
ON
OFF
Function
ON
1 2
3 4 5
6 7
OFF
Variable Water Flow Control Mode
1 2
3 4 5
6 7
Note:
• After the DIP switch is changed, the 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.
56
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 SYSTEM INSTALLATION
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 related
to electrical equipment and wiring, and following the instructions in this manual.
•Undersized wiring may lead to unacceptable voltage at the unit and may cause unit
malfunction and be a fire hazard.
•Properly ground the water source unit and indoor units. Ground wiring must always be
installed by a qualified technician. Do not connect ground wire to refrigerant, gas, or
water piping; to lightening rods; to telephone ground wiring; or to the building plumbing
system. Failure to properly provide an NEC approved earth ground can result in equipment malfunction, property damage, electric shock, physical injury or death.
Figure 58: Access Holes
for Power Wiring and
Communication Cable
Connections.
Access Hole for
Communication Cable
Access Hole for
Main Power Wiring
•Consider ambient conditions (temperature, direct sunlight, inclement weather, etc.) when selecting, installing, and connecting the
power wiring.
Separating Power Wires and Communication Cables
•Position the power wiring a minimum of two (2) inches away from the communication cables to avoid operation problems caused by electrical interference. Do not run both in the same conduit.
•If it is necessary to run the power wiring and communication cable alongside each other and cannot be avoided, table below for minimum
recommended distances.
Table 28: Power Wire and Communications Cable Minimum Required Separation Minimum Allowable Distances.
Capacity of Power Supply Wiring (current)
100V or more
Recommended Minimum Distance1,2
10A
11-13/16 inches
50A
19-11/16 inches
100A
39-3/8 inches
Exceed 100A
59-1/16 inches
The figures above are based on parallel lengths up to 328 feet long. For lengths in excess of 328 feet, the distances will have to be recalculated in
direct proportion to the additional line lengths involved.
2
If the power supply waveform continues to exhibit some distortion, the space between the power wiring and communication cable should be increased.
1
Note:
•Do not bunch the power wiring and communication cables together.
•Do not run the power wiring and the communication cable in the same conduit.
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.
57
Electrical System Installation
•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 may
include some amount of direct current. Using an oversized breaker or fuse may result in equipment malfunction, property damage,
electric shock, physical injury or death.
ELECTRICAL SYSTEM INSTALLATION
Power Wiring
Power Supply / Power Wiring Specifications
MULTI V Water Mini System Installation Manual
1. Water source unit and indoor units must obtain power from separate breakers:
•Water source unit: 1Ø, 208-230V, 60Hz
•Indoor units: 1Ø, 208-230V, 60Hz (Indoor units draw minimal power. Where permitted by NEC and local code, it may be prudent to
connect multiple indoor units to a properly sized breaker.)
2. Power supply wire type and size should be selected based on NEC and local codes. Maximum allowable voltage fluctuation ±10% or
nameplate rated value.
3. Properly ground the water source unit and indoor units per NEC and local code.
Figure 59: Schematic of Suggested Power Wiring.
Single Phase
208-230V, 60Hz
Power Supply
Single Phase Power Wiring
Breaker or Fused
Disconnect Switch
(Main Switch)
Breaker or Fused
Disconnect Switch
Pull Box (Installer Option)
Single Phase
208-230V, 60Hz
Power Supply
Connecting the Power Wiring
Figure 60: Close up of a Typical Ring Terminal.
Best practice dictates using ring or spade terminals to terminate power wiring at the power
terminal block.
If ring terminals or spade clips are not available, then:
•Do not terminate different gauge wires to the power terminal block. (Slack in the wiring may
generate heat.)
•When terminating wires of the same thickness, follow the instructions demonstrated in the
figures below.
•Firmly attach the wire; secure in a way
to prevent external forces from being
imparted on the terminal block.
•Use an appropriately sized screwdriver for
tightening the terminals.
•Do not overtighten the connections; overtightening may damage the terminals.
Figure 61: Proper and Improper Power Wiring Connections.
Terminate multiple power wires of
the same gauge to both sides.
Power Wiring
Ring Terminal
Do not terminate two wires on
one side.
:Copper Wire
Do not terminate different gauge
wires to a terminal block.
If power wires are not properly terminated and firmly attached, there is risk of fire, electric shock, and physical injury or death.
58
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 SYSTEM INSTALLATION
Wiring and Cable Terminations
1. Connect power supply wire to terminal 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.
Figure 62: Power Wiring and Communication Cable Connections in the Water Source Unit.
Electrical System Installation
L (L1)
N (L2)
Ground cable
Communication Cable(s) Terminal Block
Power Wiring Terminal Block
Power cable
Communication
cable
Wire and Cable Entry
Note:
•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 terminating. Provide some slack to facilitate removing the electrical panels
while servicing.
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.
59
ELECTRICAL SYSTEM INSTALLATION
Communications Cables
MULTI V Water Mini System Installation Manual
General Communication Cable Specifications
•Use a two-core, shielded, stranded cable between the water source
unit and the indoor units.
•Minimum 18 gauge shielded CVVS or CPEVS cable
•Insulation material as required by local code
•Rated for continuous exposure of temperatures up to 140°F
•Maximum allowable cable length: 984 feet.
•Use copper-bearing ring or spade terminals to terminate communication cables.
•Firmly attach the cable; provide slack but secure in a way to prevent external forces from being imparted on the terminal block.
•Communications cable connecting the water source unit an indoor
unit(s) should be installed and terminated in a daisy chain (BUS)
configuration starting at the water source unit.
•Terminate the cable shield to a grounded surface at the water
source unit only. Cable shields between connected devices shall be
tied together and continuous from the water source unit to the last
device connected.
Figure 63: Water Source Unit Communications Labeling Schematic.
Recommended—Two-Core Shielded, Stranded Cable in a Daisy Chain
Configuration
Improperly Terminated Communications Cable—Multiple Core Cable in
a Starburst Configuration
Note:
•Ring and spade terminals used to connect communications cables MUST be copper bearing. Do NOT use terminals that are galvanized 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. Tie the shield of each cable segment together using a wire nut at each indoor unit.
•Never ground the shield of the communications cable to the indoor unit frame or other grounded entities of the building.
•Position the water source unit communications cables away from the power wiring. Refer to minimum spacing requirements provided
in Table 28.
•Never use a common multiple-core communications cable. Each communications bus shall be provided a separate cable (i.e., between water source units and indoor units, water source units and central controller(s). If communications cables of separate systems
are wired using a common multiple-core cable, it will result in a poor communications signal and unacceptable system operation.
60
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 SYSTEM INSTALLATION
Communications Cables
Communication Cables Between the Water Source Unit and the Indoor Units
•Field Provided 18 Gauge Stranded Two-core
Cable (Shielded)
•Insulation material as recommended by local
code.
Figure 64: Water Source to Indoor Unit Communications Cable Termination Detail.
Electrical System Installation
SODU B SODU A
IDU B IDU A INT B INT A DRY 1 DRY 2 GND
Between Water Mini Unit and Indoor Units
1(L1) 2(L2)
3(A) 4(B)
TR / TQ Cassette Frames and
All Other Indoor Unit Styles
Note:
1(L1) 2(L2) 3(L1) 4(L2) 5(A) 6(B)
TM / TN / TP Cassette
Frames Only
The terminal tagged “GND” on the water source unit main PCB is not an earth ground terminal. It is a neutral (-) terminal provided to connect
the water source unit to central control devices.
Communication Cables Between the Water Source Unit and the Central
Control Device
•Field Provided 18 Gauge Stranded Two-core Cable (Shielded)
•Insulation material as recommended by local code.
Connect all central control devices such as AC Smart II, AC Smart Premium, ACP, BACnet and LonWorks gateways, and energy recovery
ventilators all on the same cable. Order does not matter. Polarity does. Keep “A” terminals with “A” terminals, and “B” terminals with “B”
terminals. Starting at the water source unit, terminate the cable on terminals Internet A and Internet B. Route the cable as needed between
each device.
Note:
Connect the shield to ground ONLY at the water source unit. Tie shields together at each termination point.
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.
61
ELECTRICAL SYSTEM INSTALLATION
Communications Cables
Communication Cables Between the Indoor Units and the Wall-Mounted Zone
Controller
•Only use LG provided three-core communications cable between the indoor unit and the wall-mounted
zone controller.
Figure 65: Indoor Unit to Zone
Controller Connection.
MULTI V Water Mini System Installation Manual
•NEVER splice, cut, or extend cable length with field provided cable. If 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.
On All Indoor Unit Styles
•Set the indoor unit operating parameters using DIP switches or by setting up the zone controller. Refer
to the indoor unit installation manuals for more details.
CN-REMO
Note:
Cable connected to Zone Controller is the factory default connection.
LG Supplied
RD
YL BK
Communication Cables Between Multiple Indoor Units Operating as a Group
(Group Control)
•If any indoor units were specified to operate in unison, use one (or
multiple) three-core Group Control Kit (sold separately) containing
extension and Y-splitter cables. One (1) 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 will be connected to the “master.
•Identity each indoor unit operating as a group as “Master” or
“Slave”. Adjust the pertinent DIP switch at each indoor unit. On
wall mounted indoor unit models, set the assignment using the
handheld remote controller.
•Use a daisy chain configuration and connect all of the group’s
indoor units together starting at the “Master” unit.
Figure 66: Indoor Unit Group to Zone Controller Connections.
On All Indoor Unit Styles On All Indoor Unit Styles
CN-REMO
CN-REMO
LG
Supplied
LG Supplied Group Control Kit (PZCWRCG3)
Note:
Cable connected to Zone Controller is the factory default connection.
62
On All Indoor Unit Styles
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.
CN-REMO
PRE-COMMISSIONING
Preparing the Electrical System / Indoor Unit Auto Addressing
Prepare the Electrical System
Verify correct, clean, specified power is at the line side of each system component’s disconnect.
1. Note if the green LED light on the component PCB board is illuminated.
2. If a Dynamic V-8 VL air cleaner is installed on a high static ducted model indoor unit, verify power has been provided to the air cleaner
controller. Verify by observing the LED in the center of the disconnect plate is illuminated.
3. If a zone controller (Remote Unit controller on the Hydro Kit) is connected to the component, verify the LCD screen displays current
operational characteristics.
Indoor Unit Auto Addressing
Note:
During the pre-commissioning process, do not change any DIP switch settings. All switches should be left in the OFF position on both DIP
switches SW01B and SW02B.
Initiate the Auto Addressing Procedure
Note:
If the Auto Address Procedure has never been successfully completed for the water source system, the compressor(s) will not start when power
is applied to the unit.
1. Verify all that all indoor units connected to the system have power to the PCB board AND all zone controller system start buttons are OFF.
2. Remove the maintenance access panel and unit control box cover from the water source unit. Place panels and screws in a secure area.
3. Verify the communications cable between the indoor units and the water source unit is terminated at the water source unit terminals
IDU(A) and IDU (B).
4. Verify the shield on the communications cable is grounded at the water source unit.
5. At the water source unit PCB, verify all DIP switches are “OFF” on DIP switches SW01B and SW02B.
6. Cycle power on the water source unit. Leave disconnect in the "ON" position.
7. Check the water source unit current configuration code(s). Observe the unit setup codes using the LED display found on the water source
units PCB. Each code will display for two (2) seconds.
Table 29: Code Display Sequence.
Sequence
Code
Description
1
Model code
2
Total capacity in horsepower
3
2
Heat pump model
Normal mode display
4
25
(If the DIP switch is not set correctly, this
number is not displayed.)
5
136
Model type (Water Mini)
Table 30: Water Mini Unit Model Identification Codes.
Capacity
Model Code (Horsepower
/ Tons) Power Supply
120
4 / 3.0
1Ø, 208/230V
121
5 / 4.0
122
6 / 4.4
Refrigerant
R410A
Note:
While this routine runs, the unit runs a self-diagnostics check. At completion, the LED should be clear and nothing displayed. Diagnostic
process should take from three (3) to seven (7) minutes.
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.
63
Pre-commissioning and Maintenance
Disconnects should only be operated by a properly licensed electrician at this time. Never look at a disconnect switch when closing. Turn away
from the switch when closing. Incorrect wiring could cause the disconnect to explode, physical injury, and / or death.
PRE-COMMISSIONING
Indoor Unit Auto Addressing
Initiate the Auto Addressing Procedure, continued
8. Know how many indoor units are connected to the system.
Figure 65: Auto Address Button Location.
MULTI V Water Mini System Installation Manual
9. Press and hold red Auto Address Button for about five (5)
seconds. 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.
SW01B SW02B
LED
Auto
Address
Button
(Red)
11.Upon completion of the auto addressing routine, the display will
be blank and the system will be in standby waiting for another
command.
12.Upon successful completion of the auto address procedure,
record the system address assigned to each indoor unit by the
auto address procedure in the column provided on the Pre-commissioning Device Configuration Worksheet.
13.After recording the system addresses assigned to each device, open the water source unit disconnect. Remove the water source unit to
indoor unit communications cable from terminals IDU(A) and IDU(B). Protect conductors by placing electrical tape over the bare ends.
14.Close the disconnect to reapply power to the water source unit and energize the compressor crankcase heater. Once again, verify the
water source unit to indoor unit(s) communications cable is not connected to terminals IDU(A) and IDU(B) of the water source unit.
15.Replace the control panel door.
Upon successful completion of the auto addressing function, an unintentional compressor start can occur unless the communications cable
to the indoor units is removed from the water source unit terminals IDU(A) and IDU(B). Do NOT open the service valves or attempt to start
water source unit compressors or until directed by the Commissioning Agent. Major damage to the unit piping and compressors will occur,
and there is a risk of explosion, suffocation, physical injury, and / or death.
64
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.
SW01B
ON
OFF
PRE-COMMISSIONING
Indoor Unit Auto Addressing
Figure 66: Indoor Unit Auto Addressing Procedure Flowchart.
Power On.
Wait 45 seconds.
Pre-commissioning and Maintenance
Outdoor unit sequences through
self diagnostics check. Wait until
LED is blank.
Press/hold the red Auto Address
Button for five (5) seconds.
LED displays
Initiate auto addressing procedure.
= 88
Wait three (3) to seven (7) minutes.
NO
LED displays
= 88
Auto addressing procedure is complete. The number of indoor
units that have successfully completed the auto addressing
procedure will display on the LED for ten (10) seconds.
Check the communication
cable connections.
YES
Auto addressing successful.
Address 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.
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.
65
PRE-COMMISSIONING
Indoor Unit Auto Addressing
Troubleshooting a Failed Indoor Unit Auto Addressing Procedure
If the quantity of indoor units the auto addressing procedure found is incorrect, or the “88” never disappears from the display for the seven (7)
minutes, the auto address routine has failed and a communications problem exists. If the Auto Address Procedure failed:
MULTI V Water Mini System Installation Manual
1. Verify ALL indoor unit ON/OFF buttons are in the OFF position (i.e., on/off button NOT illuminated).
2. Check the terminations, polarity, and continuity of each conductor on the communications cable between the water source unit and the
indoor units. Verify the indoor unit to water source unit communications cable is wired correctly.
•Verify the conductor connected to the “3 (or “5” in the case of cassette frame codes TP, TN, TM) terminals on all indoor units and is
terminated on the water source unit terminal tagged IDU(A).
•In a similar fashion, verify the conductor connected to all indoor units on the “4” (or “6” in the case of cassette chassis codes TP, TN, TM)
terminals and is terminated on the water source unit terminal tagged IDU(B).
3. Verify the shield of the communications cable is grounded at the water source unit only. All segment shields should be spliced together at
each indoor unit and NOT grounded.
4. After repairing the communications cable, go to Step 9 of the Initiate the Auto Addressing Procedure and repeat the process until
successful: Press and hold red Auto Address Button for about five (5) seconds. 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.
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 waiting for another command.
7. Record the system address the water source unit assigned to each indoor unit by the auto address procedure in the column provided on
the Pre-commissioning Device Configuration Worksheet.
8. After recording the system addresses assigned to each device, open the water source unit disconnect. Remove the water source unit to
indoor unit communications cable from terminals IDU(A) and IDU(B). Protect conductors by placing electrical tape over the bare ends to
prevent an accidental compressor start from occurring before the Commissioning Agent arrives..
9. Close the disconnect to reapply power to the water source unit and energize the compressor crankcase heater. Once again, verify the
water source unit to indoor unit(s) communications cable is not connected to terminals IDU(A) and IDU(B) of the water source unit.
10.Replace the control panel cover.
66
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.
PRE-COMMISSIONING
Group Control / Central Control
Terminating Group Controlled Indoor Units
If any of the indoor units were specified to operate in unison, create a group control communications circuit between the indoor units using a
group control cable kit consisting of three (3) cables:
•One pigtail cable.
• One Y-cable.
•One extension cable segment.
Plan the Central Control Addresses Assignments
Check with the building’s Chief Engineer and gather any preferences he may have. If there are no preferences:
•Hex assignments do not have to be assigned in any particular order, or an order defined by the routing of the communications cable
between the indoor units. In most cases, Hex addresses can be skipped.1
•All members of a Hex Group are not required to be on the same Multi V system.
•Addresses can be assigned at random, not in any particular order, and can be skipped.1
On AC EZ, do not skip addresses. Start with Hex address 0. Buttons have pre-assigned Hex addresses. If an address is skipped, the associated
button will do nothing.
1
Indoor Unit Central Control Address Assignments
Figure 67: Central Control Address Nomenclature.
A central control address is made up of two hexadecimal characters.
•The first character in the central control address is the Hex Group Identifier.
Possible Hex Group Identifiers (in order of lowest to highest) are 0-9 followed by A-F.
1
D
•The second character in the address is the Hex Member Identifier in a Hex Group.
Hex Member Identifiers (in order from lowest to highest) are 0-9 followed by A-F.
Hex Address Assignment Limitations
•There is a limit of 16 Members per Hex Group
•There is a limit of 16 Hex Groups per VRF system.
•There is a limit of 256 possible Member Identifiers per Central Control
(See Central Controller Communications Limitations on the next page).
First character is
the Hex Group
Identifier 0-F
(Example: Group 1)
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.
Second character
is the Hex Member
Identifier 0-F
(Example: Unit 14)
67
Pre-commissioning and Maintenance
1. Before proceeding with group control cable terminations, verify power is off at all indoor units effected.
2. Identify which indoor unit will be the “Master” unit of the group. If not already recorded, record the "Master" 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 the CN-REMO
socket.
•Plug the Y-cable into the pigtail at each indoor unit except for the last Slave indoor unit in the group where no Y-cable cable will be
needed.
•Connect two extension cable segments to each “Y” cable except for the “Y” cable connected to the Master indoor unit. At the Master
indoor unit, connect one extension cable and the communications cable from the zone controller to the Y-cable.
PRE-COMMISSIONING
Central Control
Central Controller Communications Limitations
MULTI V Water Mini System Installation Manual
Each 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.
Group Number
Table 31: Central Controller Indoor Unit Connection Limitations.
Central Control Device
Maximum Indoor Unit Quantity
AC EZ
32
AC Smart II
64
AC Smart II with Expansion Kit
128
AC SMART Premium
128
LonWorks Gateway
64
BACnet Gateway
256
Advanced Control Platform
256
If the building operator wants to know which indoor units are on each water source unit, and multiple systems serve a building:
•Assign a Group Number to each system. If there are more than 16 indoor units on a system, multiple Group Numbers may be necessary.
If the building owner wants to know which indoor units are on each floor:
•Assign a different group number for each floor. If there are more than 16 indoor units on a floor, multiple Group Numbers may be
necessary.
Member Number
Can be assigned at will or for example, can follow the room layout on each floor.
For each LG Central Controller product provided on the project, devise a central control address schedule and assign a central control address to each indoor unit(s) Hydro Kit(s), and ERV(s) units. Record this central control address for each component in the column provided
on the Pre-commissioning Device Configuration Worksheet.
Upload Central Control Address to the Indoor Units
For all ducted, vertical and floor standing indoor units, the central control address must be assigned using a wired zone controller. Wallmount, ceiling cassette, ceiling suspended, and the wall/ceiling convertible indoor units, the central control address can be assigned using a
wireless handheld controller or a wired zone controller.
Power Up All Indoor Unit PCBs
Turn the disconnect for each indoor unit to the “ON” position. DO NOT turn the unit ON (on/off button remains off).
68
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.
PRE-COMMISSIONING
Central Control
Note:
During the following procedure, NEVER PUSH the ON/OFF (Enable operation) Button on the zone controller.
For Indoor Units That Are NOT Being Controlled as a Group
1. Verify the zone controller cable is plugged into CN-REMO socket on the indoor unit PCB.
2. Using the controller, go to the setup function 02 (icons are different for each controller. Refer to the controller user’s manual for more
information.)
3. Type in the Hex Central Control address that has been designated to the unit.
4. Repeat Steps 1 through 3 for each indoor unit in the building.
1. Before attempting to assign a central control address to an indoor unit controlled as a group, identify which unit in the group will be identified as the Master indoor unit and which indoor units are going to be identified as Slave units.
2. Go to the Master indoor unit, and access the PCB.
3. Verify a group control pigtail cable is plugged into the CN-REMO socket on the indoor unit PCB. If it is not, do so now by plugging the
communications cable pigtail into the CN-REMO socket.
4. If the group control extension cable between the indoor units is plugged into the Y-cable, unplug the extension cable from the Y-cable.
5. If not already present, plug the zone controller communications cable into the pigtail cable.
6. Using the controller, go to the setup 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 permanently mounted in place, plug the Y-cable back into
the pigtail and obtain a loose zone controller with a communications cable to continue programming the Slave indoor units.
9. Go to the first Slave indoor unit and disconnect the Y-cable from the pigtail.
10.Plug the zone controller communications cable into the socket on the pigtail cable. Do not push the ON / OFF button or enable indoor unit
operation.
11.Using the controller, go to the setup function 02 (icons are different for each controller. Refer to the controller user’s manual for more
information.) Type in the Hex address assigned to the unit.
12.Change DIP switch No. 3 on the indoor unit PCB to the “ON” position.
13.Disable power to the indoor unit using the disconnect switch. Wait one (1) minute.
14.While power is off, unplug the zone controller cable from the pigtail socket.
15.Plug the group control Y-cable back into the pigtail.
16.Restore power to that Slave indoor unit, and go to the next Slave indoor unit.
17.Repeat Steps 9 to 16 for each Slave indoor unit except the last one in the group. At the last Slave indoor unit, the process is the same
except unplug the group control cable from socket CN-REMO on the indoor unit PCB board and plug the zone controller cable into the
same socket.
18.After all Slave indoor unit have addresses assigned, go back to the Master indoor unit and restore power.
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.
69
Pre-commissioning and Maintenance
For Indoor Units That Are Being Controlled as a Group
PRE-COMMISSIONING
Indoor Unit Temperature Sensing Strategy / Air Balance
Indoor Unit Temperature Sensing Location Selection
MULTI V Water Mini System Installation Manual
For each indoor unit connected to a wired zone controller, select a zone temperature sensing option. Assign one of three methods for the
indoor unit to sense the zone temperature. Skip this step for indoor units controlled from a handheld (wireless) controller. Record the sensing
for each indoor unit on the Pre-commissioning Device Configuration Worksheet. There are three possible strategies:
1. Use the unit-mounted return air sensor (or the optional remote wall-mounted sensor).
2. Use the sensor mounted in the zone controller.
3. Sense the temperature at the unit-mounted return air sensor (or the optional remote wall-mounted sensor) and sensor mounted in the
zone controller, then control based on the temperature reading using the sensor that is farthest from set-point.
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-Commissioning Device Configuration Worksheet. If the fan setting value was left at the factory default insert “00” in the blank.
Note:
It is always best if the air balance is completed prior to a request for a commissioning agent. If the air balancing contractor has not completed
the work before commissioning, the Commissioning Agent is not responsible for setting the indoor unit air flow rates, fan speed, or insure
the air volume delivered at each indoor unit is per project specifications, only to spot check. Excessive or restricted airflow may impact the
ability of the Commissioning Agent to successfully complete system commissioning. If problem exists, request verification from the Test and
Balance contractor. If necessary, provide instruction to the air balance technician on how to adjust the indoor unit fan setting value.
70
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.
PRE-COMMISSIONING
Prepare the Refrigerant Piping System
Note:
Open all isolation valves that may have been installed in the piping system. Water source unit service valves must remain closed.
Perform a Pressure (Leak) Test
Use medical grade dry nitrogen, and pressure test the refrigerant piping system using a multi step process that will assist in locating leaks (if
any). Pressure test the segment of piping between the water source unit and the main pipes. If the test is successful the pipes 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
Note:
The water source unit may be put in “vacuum mode”. Generally, using the vacuum mode feature does assist with the vacuum process and
is not necessary if a vacuum pump is connected to all charging ports at the water source unit simultaneously as suggested herein. See the
Technical Service Manual for this product for more information.
1. Release the Pressure Test dry nitrogen charge from all refrigerant pipes.
2. Verify ALL field installed isolation ball valves are OPEN (including those that are capped for future use).
3. Remove and discard the Schrader valve cores at the water source unit charging ports. (This is a preventive step that ensures that valves
used after charging the system have not been subjected to the high pressure value used during the Pressure Test.)
4. Attach a 5/16” core removal tool equipped with ball valve and a fresh core to each charging 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 core removal tool ball valves.
10.Remove the vacuum hoses and pumps.
Note:
Do not open the water source unit service valves and release the factory refrigerant charge until the Commissioning Agent authorizes to do so.
11.Leave the refrigerant piping system in a vacuum until the Commissioning Agent arrives and is satisfied with the micron gauge reading.
Note:
•There is no danger in doing this as all piping and equipment are dry and have never had oil in them.
•The system must be left in a vacuum until the Commissioning Agent arrives and verifies the quality of the evacuation process. If the evacuation procedure was not conducted properly, the system will likely malfunction and operate erratically. Significant costs may be incurred
including but not limited to refrigerant reclaim, recycle, and replacement.
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.
71
Pre-commissioning and Maintenance
Evacuate the Refrigerant Piping System
PRE-COMMISSIONING
Preparing / Balancing the Water Circuit
Preparing the Water Circuit
1. Verify the specified waterside piping specialties such as temperature and pressure gauges, Pete’s plugs, water balancing valves, shutoff
valves, strainers, air vent(s), etc., were installed.
2. Verify the water circuit pump is operating correctly and the proper flow and temperature of water is provided to the water source unit.
3. Thoroughly flush the water circuit. Continually check and clean strainers as necessary. Continue flushing until strainers remain clean.
4. Purge all air from the water circuit. Check all auto or manual air valves installed.
Note:
MULTI V Water Mini System Installation Manual
To prevent the heat exchanger from freezing, drain water out of the unit before charging the refrigerant.
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 commissioning. It is best if the water flow balancing is completed prior to initiating a request for a Commissioning Agent. Upon completion of the
waterside balancing, the report should provide the maximum flow rate (GPM) at the water source unit.
Note:
The Commissioning Agent is not responsible for setting the water flow rate, only to spot check. If a problem exists, request verification from
the Test and Balance technician. If necessary, provide instruction to the technician on how to adjust the setting(s).
72
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.
PRE-COMMISSIONING
Prepare Pre-commissioning Package Documents / Initiate a Request
Prepare Pre-commissioning Package Documents
Optional, but Highly Recommended
It is always best if the air balance is completed prior to a request for a commissioning agent to insure the air volume delivered at each indoor
unit is per project specifications. The commissioning agent is not responsible for setting the indoor unit fan speed or ensure the air volume
delivered at each indoor unit is per project specifications. Excessive or restricted airflow may impact the ability of the commissioning agent
to successfully complete system commissioning. Upon completion of the air balance, the report should include the adjusted indoor unit’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.
System Commissioning
The Multi V System commissioning process and procedures are provided in a separate manual and/or in training materials provided by the
LG Academy Training Team. To obtain a copy, you must be a certified LG commissioning agent.
After Commissioning Has Been Requested
The commissioning agent may contact you to discuss specific job points, scheduled day(s) and expected duration. It is the contractor’s
responsibility to provide all of the necessary start-up labor, refrigerant, tools and test equipment needed to complete the process in the
expected time frame. Please note that the commissioning agent’s allotted time at your project DOES NOT include owner training.
It is understood that the contractor is to request for a commissioning agent when all required project readiness points are complete; not
based on an “expected” completion date. The contractor also acknowledges that they will assume all responsibility for costs incurred by the
commissioning agent including but not limited airfare, travel costs, transportation, shipping, labor, and tool costs due to lack of readiness.
The commissioning agent’s schedule is usually very rigid, and may have no flexibility regarding duration. It also involves advance travel arrangements that may be impractical or impossible to change.
Freight Damage and Unit Replacements..................................................................... Your LG Manufacturer Representative
Missing Parts................................................................................................................ Your LG Manufacturer Representative
Received Wrong Water Source Unit Model.................................................................. Your LG Manufacturer Representative
Installation, Startup, and Commissioning Technical Assistance............................... 1-888-865-3026
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.
73
Pre-commissioning and Maintenance
1. A copy of the refrigerant piping system(s) shop drawing(s) generated by LATS Multi V pipe design software.
2. A copy of the pipe fitter’s pipe changes and field notes.
3. A verified copy of the “As-Built” LATS Multi V Project file (*.mtv) that includes all changes noted by the pipe fitter(s) in 2. Notes should
include changes to the line lengths and # elbows 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 Control Devices.
Correct any needing attention before continuing.
5. A copy of the water circuit control sequence of operation.
6. A water circuit flow balancing report.
7. A completed Pre-commissioning Device Configuration Worksheet.
8. A completed copy of the Pre-commissioning Checklist.
9. If an AC Smart Central Controller is provided and it is to be connected to the building network, record the IP Address on the Pre-commissioning Device Configuration Worksheet.
MAINTENANCE
Maintaining the Heat Exchanger
To prevent heat exchanger damage and decreased system performance from scaling, the heat exchanger should be inspected once (1) per
year or more often depending on the quality of the water and the water treatment program. For systems using an open tower, clean the heat
exchanger annually or more often if local conditions require. Systems using closed cell towers need to be cleaned a minimum of once every
five (5) years or more often if local conditions require.
MULTI V Water Mini System Installation Manual
Yearly Inspection
The plate heat exchanger must be inspected once (1) a year, and should include:
•Water should be tested to see if it is within quality levels listed in the water circuit installation section of this manual.
•Strainer should be cleaned.
•Water flow rate should be checked.
•Water pressure, flow, and inlet / outlet water temperatures should also be checked.
Five (5) Year Cleaning Procedure
The heat exchanger is not designed to be disassembled and does not contain any replaceable parts. If the heat exchanger cannot be
cleaned, the entire exchanger must be replaced.
•Heat exchanger cleaning solutions can include 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 corrosive 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 service port, fill the heat exchanger with cleaning solution heated to 122°F–140°F, and circulate the solution for two
(2) to five (5) hours using the solution tank pump. Procedure time may depend on the cleaning solution temperature, or the amount of scaling present. Watch for a change in cleaning solution color to determine how long the procedure should last.
•After circulating the cleaning solution, drain the heat exchanger, fill it with 1%-2% NaOH (Sodium Hydroxide) or NaHCO3 (Sodium
Bicarbonate), and circulate for 15 to 20 minutes to neutralize the system.
•Flush the heat exchanger with clean water and measure pH. Once the pH is within recommended levels, open the isolation valves, purge
air from the system, and check unit operation.
Figure 68: Schematic of Heat Exchanger Maintenance.
Field-supplied
Hose
Ball valve (closed)
Service access valve
Ball valve (closed)
Service access valve
Vibration
Eliminators
Strainer
Drain valve (closed)
Field-supplied
Hose
Water-source Unit
Filter
Field-supplied
Pump
Note:
Before using a chemical solution to clean the heat exchanger, note its potential to corrode stainless steel or copper. Consult the chemical
solution manufacturer for more information.
74
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.
MAINTENANCE
General Maintenance Schedule
1. Water Quality Control
•The heat exchanger is not designed to be disassembled, cleaned, and does not contain any replaceable parts. If the heat exchanger is not
usable, the entire exchanger must be replaced.
•To prevent corrosion or scaling, water quality must be controlled. Refer to the recommendations in Table 32 for minimum water quality
requirements.
•Use only anti-corrosion agents or corrosion inhibitor additives that do not contain chemicals which damage or attack 316 stainless steel and
ACR copper.
•Drain and replace the water / glycol mixture on a regular basis as needed. Frequency will depend upon the quality of the water treatment
program used.
Table 32: Minimum Water Quality Requirements.
pH (77°F)
Conductivity (77°F) mS/m
Chlorine ions (mg Cl-/ℓ)
Sulfate ions (mg SO42/ℓ)
Acid consumption (pH4.8) (mgCaCO3/ℓ)
Total Hardness (mg CaCO3/ℓ)
1
●
●
●
●
Effect
Scale1
7.0 ~ 8.0
Below 30
Below 50
Below 50
Below 50
Below 70
7.0 ~ 8.0
Below 30
Below 50
Below 50
Below 50
Below 70
Below 50
Below 50
●
Below 30
Below 30
●
Below 1.0
Below 1.0
Must not be detected
Below 0.3
Below 0.25
Below 0.4
Below 0.3
Below 0.1
Must not be detected
Below 0.1
Below 0.3
Below 4.0
Calcium Hardness (mg CaCO3/ℓ)
Ionic-static silica (mg SiO2/ℓ)
Reference Item
Iron (mg Fe/ℓ)
Copper (mg Cu/ℓ)
Sulfate ion (mg SO42/ℓ)
Ammonium ion (mg NH4+)ℓ
Residual chlorine (mg Cl/ℓ)
Free carbon dioxide (mg CO2/ℓ)
Stability index
Corrosion
1
●
●
●
●
●
●
●
Pre-commissioning and Maintenance
Basic Item
Closed Type System
Circulating Water
Supplemented Water
●
●
●
●
●
●
●
The “●” mark for corrosion and scale means that there is a possibility of occurrence.
2. Flow Rate Control
•The heat exchanger may freeze if water flow rate is insufficient.
•Check for a restricted strainer or if air is in the water piping system. Also measure the temperature and pressure difference between the
inlet and outlet to verify the flow rate is per specifications.
•If the temperature and pressure difference is above the specified range, the flow rate is insufficient. Immediately cease system
operation, locate the source of the problem and repair as needed. After any water circuit maintenance is preformed, always bleed air from
the water system at all installed air vents.
3. Antifreeze Concentration Management
•Use the manufacturer’s recommended type and amount of antifreeze. Do not use solutions with calcium chloride; these can corrode the
heat exchanger.
•Maintain antifreeze levels. If there is a drop in the amount of antifreeze, the heat exchanger may freeze. Ensure that the antifreeze is not
exposed to the atmosphere, and periodically measure antifreeze levels, adding as necessary.
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.
75
MAINTENANCE
General Maintenance Schedule
Table 33: Minimum Maintenance Schedule.
Period (Year)
Procedure
Product operating condition
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
Heat exchanger cleaning (Wash)
MULTI V Water Mini System Installation Manual
Strainer cleaning
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
Water quality check
●
Refrigerant leakage check
●
Indoor unit filter cleaning
●
●
●
●
●
●
●
●
●
●
Note:
●
●
●
●
●
●
•The checklist above is based on minimum requirements. Maintenance may need to be increased depending on operating condition and
/ or water quality.
•Before cleaning the heat exchanger, make sure that the water pipe connections are tight so that chemical detergent does not leak.
When cleaning the heat exchanger, close the valves so that chemical detergent does not penetrate into the pressure gauge, etc.
•Dilute the chemical 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 properly cleaned, remove the hose at the heat exchanger and, using a flashlight or other bright light
source, visually inspect the interior surfaces of the heat exchanger.
•After completing the visual inspection and determining the heat exchanger is clean—free of debris and mineral deposits and the cleaning chemicals have been thoroughly flushed—close the system up, replace the water and purge the air from all air vents located on the
pipe system. Purge the air inside the water piping.
•Always check if the water supply is flowing normally and in the correct direction before operating the unit.
76
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.
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:
•Pressure graph
Figure 69: MV Real-time Data Screen.
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
•IDU fan speed
•Software version
•IDU EEV position
•Installer name
•IDU room temperature
•Model number
•IDU inlet pipe temperature
•Site name
•IDU outlet pipe temperature
•Total number of connected IDUs
•IDU error code
•Communication indicator
•IDU capacity
•IDU operating mode
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
Error Codes
•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
Figure 70: MV Cycleview.
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.
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.
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.
77
LG MONITORING VIEW (LGMV)
DIAGNOSTIC SOFTWARE
5. Data
•Data Saving Start: Recording of real time data to a separate file created to be
stored on the user’s computer.
•Data Loading Start: Recorded data from a saved “.CSV” file can be loaded to
create an LGMV session.
Figure 71: MV Control Indoor Units Screen.
MULTI V Water Mini System Installation Manual
6. Monitoring
•Electrical: The lower half of main screen is changed to show Inverter
Compressor Amps, Volts, Power Hz, Inverter control board fan Hz.
Error Codes
Figure 72: Error Code Screen.
LGMV software helps the service technician or commissioning agent
to troubleshoot system operation issues by displaying malfunction
codes. These error codes can be seen on the main screen of the
LGMV software program. For an overview of Water Mini error codes,
see page 79. For detailed information on how to troubleshoot individual error codes, see the Water Mini Service Manual.
The software is available in a high version with all of the features listed above. The low version has all features as the high version without
Target High Pressure and Target Low Pressure values shown on main screen.
In lieu of connecting to the WSU, user has the option to connect to IDU with the 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:
•CPU: Pentium® IV 1.6 GHz
•Main Memory: 1G
•Operating System: Windows® XP/Vista/7 32 bit (recommended),
64 bit
•Hard Disk: 600 MB when operating
•MS Office 2003, 2007 (recommended) for select reporting
functions
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.
78
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.
ERROR CODE TABLES
Error Codes
•Indicate different types of unit failures, assists in self-diagnosis and
to track the frequency of occurrence.
•Error codes are shown on the LED of indoor units, wired remote
controller, the water source unit control board, and LG Monitoring
View (LGMV) Diagnostic Software.
•If two or more errors occur simultaneously, the lower error code
number is displayed first.
•After error is resolved, the error code does not display.
Table 34: Error Codes.
Error Code
Error Display
The first and second number on the LED indicates error number; the
third number on LED indicates water source unit number.
Example: 01 = Error No. 1 on water source unit 1
Error Code Nomenclature Definitions
•MICOM: Non-volatile memory chip where unit setup information is
stored.
•EPROM: Non-volatile memory chip where device identification,
size, and factory defined default component operating parameters
are stored.
Description
Details
Indoor Unit
Water Source Unit
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.
79
Error Codes
Indoor unit return air or optional remote wall tempera- Indoor unit air temperature sensor has disconnected or short
0 1 circuited. (Check the wiring, connection at the CN Room socket
ture sensor communications error.
on the indoor unit PCB, then check the thermistor.)
Indoor unit inlet pipe temperature sensor communica- Indoor unit inlet pipe temperature sensor has disconnected or
0 2 short circuited. (Check the connection at the CN-PIPE/IN socket
tion error.
on the indoor unit PCB, then check the thermistor.)
Communication
error
between
zone
controller
and
Indoor unit PCB has not received communications signal from
0 3 - indoor unit.
zone controller.
Drain pump and/or flow switch is/are malfunctioning. Also check
0 4 - Indoor unit drain pump error.
drain line for obstructions.
•Indoor unit has not received communications signal from water
source unit.
Communication
error
between
water
source
unit
and
•Check
indoor unit to water source unit communication cable for
0 5 - indoor unit.
issues (Check A terminals are connected to indoor unit A and 3
(5 on 3 x 3 cassette) terminals; B connect to B or 4 (6 on 3 x 3
cassette) terminals.
Indoor unit outlet pipe temperature sensor has disconnected
0 6 - Indoor unit outlet pipe temperature sensor error.
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.
•Communication error between the indoor unit PCB board and
its option card. (The option card is about 1′ x 1′ and is plugged
into the indoor unit PCB board. Check the connection between
the two.)
0 9 - Indoor unit EPROM error.
•Communication error between EPROM chips on the indoor unit
main PCB.
•Indoor unit EPROM data is not available.
•Fan motor has been removed or is defective. Use the OHM and
voltage check charts in the product service manual.
•The system has detected the fan motor is not spinning.
•On new installs, verify the installation manual and paperwork
1 0 - Indoor unit BLDC fan motor communications error.
were removed from the fan discharge shroud before the unit
was installed.
•Check the wiring plug and connection at sockets CN-MOTOR1
and CN-MOTOR2 (if used).
•Water source unit inverter compressor PCB error.
•Under voltage
2 1 1 Water source unit inverter compressor PCB error.
•Refrigerant flow restriction from defective LEV or clogged strainer.
•Refrigerant charge is too high (overcharge).
•Overcurrent of water source unit inverter board PCB.
•Under voltage
Water
source
unit
inverter
board
input
overcurrent
2 2 1 (RMS) error.
•Refrigerant flow restriction from defective LEV or clogged strainer.
•Refrigerant charge is too high (overcharged).
For detailed information on how to troubleshoot each error, see the Water Mini Service Manual on www.lg-vrf.com.
ERROR CODE TABLES
Table 35: Error Codes, continued.
Water Source Unit
MULTI V Water Mini System Installation Manual
Error Code
2
3
2
6
2
8
2
9
3
2
3
4
3
5
4
0
4
1
4
2
4
3
4
4
4
5
4
6
5
1
5
2
5
3
6
0
Description
Details
DC voltage sensed at the water source unit inverter DC voltage failed to charge on power up. (Start diagnosis at the
1 Low
compressor DC link.
CN inverter socket on the water source unit noise filter PCB.)
Initial operation failure due to water source unit inverter
1 Water source unit inverter compressor operation error. compressor
problem.
Compressor
shut off because water source unit inverter PCB DC
1 Water source unit inverter DC link high voltage error.
link voltage is too high.
1 Water source unit inverter compressor overcurrent error. Water source unit inverter compressor current draw is too high.
•Shutdown due to excessive discharge gas pressure.
increase in water source unit inverter com1 Excessive
•Check flow switch, clean the strainer, and verify pump is
pressor gas discharge temperature.
working properly.
•Shutdown due to excessive discharge gas pressure.
•Water flow rate may be insufficient, or there is a problem with
1 Compressor high pressure safety tripped.
the flow switch. (Start diagnosis at the CN inverter socket on the
water source unit noise filter PCB.)
•Shutdown due to low suction pressure.
side pressure transducer senses pressure below
1 Low
•If operating in heating mode, check flow switch, clean the
allowable limits.
strainer, and verify pump is working properly.
Water
source
unit
inverter
compressor
current
transWater
source unit inverter compressor current transducer (CT)
1 ducer (CT) sensor error.
detection sensor has disconnected or short circuited.
•Check the connection at the CN-34 socket on the water source
source unit inverter compressor discharge pipe
PCB.
1 Water
temperature sensor error.
•Thermistor has disconnected or short circuited.
•Check the connection at the CN-32 socket on the water source
PCB.
1 Water source unit low pressure transducer error.
•Transducer has disconnected or short circuited.
•Check the connection at the CN-30 socket on the water source
PCB.
1 Water source unit high pressure transducer error.
•Transducer has disconnected or short circuited.
•Check the connection at the CN-35 socket on the water source
source unit ambient temperature sensor error.
PCB.
1 Water
(TH_AIR)
•Thermistor has disconnected or short circuited.
•Check suction sensor in cooling mode; check hot gas sensor
located near the heat exchanger in heating mode.
Water
source
unit
heat
exchanger
pipe
temperature
•Check
the connection at the CN-34 socket, connector tag
1 sensor (TH_HEX2) error.
TH_HEX2, on the water source PCB, then check if thermistor
is open or shorted.
•Thermistor has disconnected or short circuited.
•Check the connection at the CN-35 socket, connector tag
source unit compressor suction pipe temperature TH_SUCTION, on the water source PCB.
1 Water
sensor (TH_SUCTION) error.
•Thermistor has disconnected or short circuited.
The total of the nominal indoor unit capacity is less than 50% or
1 Combination ratio is out of range.
more than 130% of the nominal water source unit capacity.
•Communication error between main PCB (CN-29) and inverter
PCB CN-MAIN (COM/RD).
Communication error between water source unit main
1
•Check connections at both sockets.
PCB and inverter PCB.
•Inspect interconnecting cable for wear.
•Check if water source to indoor unit(s) communications cable
has disconnected or short circuited.
error between water source unit main
1 Communication
•Check A terminals are connected to indoor unit A and 3 (5 on 3
PCB and indoor unit(s) PCB.
x 3 cassette) terminals; B connect to B or 4 (6 on 3 x 3
cassette) terminals.
•Verify the EPROM is present and in the socket correctly.
1 Water source unit inverter PCB EPROM error.
•Check if all pins are in and are not bent.
•Check if notch in the chip lines up with the arrow on the socket.
For detailed information on how to troubleshoot each error, see the Water Mini Service Manual on www.lg-vrf.com.
80
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.
ERROR CODE TABLES
Table 36: Error Codes, continued.
Error Code
Water Source Unit
8
6
1
1 1 3 1
1 5 1 1
1 8 1 1
Description
Details
•Verify the EPROM is present and in the socket correctly.
•Check if all pins are in and are not bent.
Water source unit main PCB onboard EPROM error.
•Check if notch in the chip lines up with the arrow on the
socket.
•Check the connection at the CN-33 socket on the water source
Water source unit liquid pipe temperature sensor (SC_L) PCB.
error.
•Thermistor has disconnected or short circuited.
•Check the connection at the CN-09 socket on the water source
Water source unit four-way reversing valve switch
PCB.
(4WAY_1) error.
•Thermistor has disconnected or short circuited.
•Check the connection at the CN-36 socket on the water source
Inlet water temperature sensor error (DISCHARGE (C2). PCB.
•Thermistor has disconnected or short circuited.
Error Codes
For detailed information on how to troubleshoot each error, see the Water Mini Service Manual on www.lg-vrf.com.
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.
81
MULTI V Water Mini System Installation Manual
82
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 Tag
IDU's
Building
Floor
Room ID
Pre-Com Tech Name/Ph#/email
Mech Contractor Company Name
Date:
Project Name:
Type
AC Smart
Static IP address:
Model
Low | Medium | High
rev 20130619.3
Serial #
Adjusted
Fan Setting Value
.
Ph# / Email
MEP Project Mngr Name
System ID
Building ID
System
Address
Group
Central
member ID
Control
or N/A if not
Address
in a group
LG Multi V Pre-Commissioning Device Configuration Worksheet
Group
Function
M=Master
S=Slave
Page #
Sensor
Strategy
(RA/ZC/Both)
INSTALLATION CHECKLIST
PAGE 1
Major Component Rough-In
Description
All Multi V water source units are connected properly per local code and the product installation procedures.
All literature and bagged accessories have been removed from the fan discharge (ducted and cassette model indoor units).
Indoor units are installed, properly supported, and located indoors in a non-corrosive environment.
Duct work installation completed (ducted indoor units only).
Water source unit’s gravity condensate drain line was connected and properly routed to a drain terminal.
Piping and Insulation
Description
Copper
Over 5/8 inches—Rigid ACR only.
5/8 inches and under—Can use soft ACR.
15% silver brazing material only.
All refrigerant pipes and valves are insulated separately. Insulation butts up against the walls of the indoor units. No gaps or
cracks. Insulation was not compressed at clamps and hangers.
LG Y-branch fittings or headers were used as per LATS Multi V report.
(Optional) Full port ball valves for all indoor units. (Schrader between the valve body and the indoor units.)
Brazing Practices
Description
Use medical grade (there are 4 available) dry nitrogen for purging during brazing (constant 3 psi while brazing).
Minimum 3/4″, maximum 1″ condensate piping installed on indoor units–material used is acceptable under local code. Insulated
as necessary to prevent condensation.
Check
Check
Check
Installation
(For more information on any procedure, refer to the detail provided in the Water Source and Indoor Unit Installation Manuals.)
Refrigerant Piping
Description
You must have in your possession a copy of the “As-Designed” LATS Multi V piping tree diagram. BEFORE ANY FIELD PIPE
SIZE OR LENGTH CHANGES ARE MADE, PROPOSED CHANGES MUST BE FORWARDED TO THE DESIGN ENGINEER SO
THAT THEY CAN INPUT THE CHANGES INTO LATS and RE-ISSUE A NEW LATS MULTI 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 brazing.
During refrigerant pipe installation, for each segment of pipe, a record was made of the pipe length (including expansion loops,
offsets, double-back sections), and sizes, as well as the quantity and type of elbows used.
All long runs of straight pipe were provided with expansion loops.
Insure Y-branch fittings are installed with no more than ±10° of horizontal.
Insure Y-branch fittings are installed with no more than ±3° of vertical.
Insure all Header fittings are installed horizontal at an elevation above all connected indoor units.
A torque wrench and backup wrench were used to tighten all flare connections.
The back side of all flares were lubricated with a small drop of PVE refrigeration oil before tightening flare fittings.
Insure all field made flares are 45°. Use factory-supplied flare nuts only.
All pipe segments were properly supported and all wall penetrations were sleeved.
All pipe insulation is not compressed at any point.
Y-branch and headers fittings were properly supported per details provided in the Water Source Unit Installation Manual.
Insure Y-branch fittings are installed in the correct direction. Flow is always from the single end to the double end.
No oil traps, solenoid valves, sight glasses, filter driers, or any other unauthorized refrigerant specialities are present.
(Optional) High quality R410A rated full port ball valves with a Schrader port were used at all indoor units and at will in the
refrigerant piping network. (Recommended for serviceability.)
Best practice includes a minimum of 20″ of straight pipe was installed between each elbow, and Y-branch or header fitting, and
between two Y-branch fittings.
Check
INSTALLATION CHECKLIST
PAGE 2
Water Piping
Description
A No. 50 mesh (or better) minimum one inch diameter strainer is installed on the inlet pipe.
Strainer service isolation valves, (optional bypass line and shutoff valve) provided on both ends of strainer. Strainer drain line
installed.
A balancing valve has been installed.
A flow switch has been installed.
Thermometers (or Pete’s plugs) are installed on the inlet and outlet pipes.
(Optional) Pressure gauges were installed on the inlet and outlet pipes.
Piping is insulated properly per the design engineer’s specifications.
Pipes are properly supported. No lateral pressure is present on the inlet and outlet connections.
The inlet and outlet pipes are connected at the water source unit. Water flow direction is correct (pipes are not reversed).
Shutoff valves present at inlet and outlet of the water source unit.
Condensate Pump / Drain Installation
Description
Indoor unit condensate drain pipes were installed correctly.
All condensate vertical risers are equal to or less than 27-1/2″ from the bottom of the indoor unit.
Indoor units with condensate pumps were level. Units with gravity drains were level or slightly canted toward the drain connection
and are supported properly.
Pumped condensate drain lines were properly connected (do not have traps, and connect to the top surface of the main drain
line).
Power Wire and Communications Cables
Description
Power 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 requirements.
Communications cable between the water source unit and indoor units was connected in a daisy chain configuration (i.e., single
parallel chain). No “Star” or multiple parallel circuits. No cable splices or wire caps were used to connect communications cables.
LG-supplied cable was used between each indoor unit and its zone controller. No cables were spliced and no wire caps are
present.
Communication type RS-485–BUS type.
All communications cables are a minimum of 18-Gauge, two conductor, stranded, with insulation material per local code. Cable
segment shields were tied together. Cable shield is grounded at the water source unit only.
Use appropriate crimping tool to attach ring or spade terminals at all power wiring and control cable terminations.
Verify all ring and spade terminals are copper bearing in all communications daisy chains. Galvanized or nickel plated steel
connectors were not used.
All power and control wires were properly separated using the recommended distance provided in the product installation manual.
Only LG-supplied Y-cables and extension cables were used between indoor units.
Flow switch communications cable has been properly terminated at the switch and the water source unit.
Check
Check
Check
PRE-COMMISSIONING CHECKLIST
Page 1
Job Name / Location_________________________________________________________________________ Tag #__________________
Date: _____________________________________________________________________________________
Address: __________________________________________________________________________________
__________________________________________________________________________________
Refrigerant Circuit Preparation
Description
Using a copy of the LATS Multi V pipe design diagram, verify the sum of the indoor unit nominal capacity connected to the piping
system is between 50% and 130% of the water source unit’s nominal capacity. If this rule is violated, the system will not start.
Check all indoor units for power at the unit disconnect and power is present at the indoor unit PCB board. (LED is lit.) DO NOT
TURN ON THE UNIT using the ON/OFF button.
Successful auto address routine is complete. All device addresses have been recorded on the Indoor Unit Device Configuration
Worksheet.
Insure all field-installed full-port ball valves are open.
The piping system held a constant 550 psig pressure for a minimum of 24 hours with all isolation valves open.
A triple system evacuation 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 the IDU (B) and IDU (A) terminals at the water source
unit.
None of the water source unit service valves have been opened during the installation and preparation of the system for commissioning. (If the valves were opened, the factory refrigerant charge has been released.)
Water Circuit Verification
Description
System has been pressure tested to the designer's requirements. All unions and fittings are leak free.
System has been filled with fluid, flushed, and all air has been purged from the piping circuit.
Pump rotation direction is correct.
Water flow enters on the water source unit inlet and leaves from the unit outlet.
Pump and water source unit strainers are clean.
Water balance has been completed.
Proper water flow rate is present at each water source unit.
Flow switch has been calibrated to trip at the water source unit's minimum flow requirement.
Water has been properly treated with a rust inhibitor and fungicide chemicals.
If required, an antifreeze chemical has been added to the water circuit.
Check
Check
PRE-COMMISSIONING CHECKLIST
Page 2
Prepare Pre-commissioning Package Documents
Include
1. A copy of the refrigerant piping system(s) shop drawing(s) generated by LATS Multi V pipe design software.
2. A copy of the pipe fitter’s pipe changes and field notes.
3. A verified copy of the “As-Built” LATS Multi V Project file (*.mtv) that includes 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 Control Devices. Correct any procedures needing attention before initiating a request for commissioning..
5. A copy of the air balance report showing proper airflow at all indoor units.
6. A copy of the water circuit’s control sequence of operation.
7. A water circuit flow balancing report.
8. A completed Pre-commissioning Device Configuration Worksheet.
9. A completed copy of the Pre-commissioning Checklist.
10.If available, a list of IP addresses obtained from the building owners IT department for each ACP, BacNet, LonWorks, AC Smart
II, AC Smart Premium devices.
Initiate a Commissioning Request
Description
Verify this checklist and requirements herein have been met. Complete this checklist in its entirety BEFORE initiating a request for
Commissioning..
Send all Pre-commissioning Package Documents to your LG Applied Representative.
Check
Check
Contractor Name: _______________________________________ _____________________________________________________
(Authorized Signature)
Address: _____________________________________________
_____________________________________________
Phone: ______________________________________________
Date: ________________________________________________
*This form must be completed and submitted to LG a minimum of three (3) weeks prior to final scheduling of any startup.
Note: If any of the above items are not complete at time of start-up, back charges will be assessed for additional costs.
PRE-COMMISSIONING CHECKLIST
Page 3
Notes for the Commissioning Agent
PRE-COMMISSIONING CHECKLIST
Page 4
Notes for the Commissioning Agent
REFRIGERANT CHARGE WORKSHEET
Note:
The system will stop operation due to excessive or insufficient refrigerant, therefore, always charge the unit properly. When servicing, always
refer to any notes about system piping length and additional refrigerant amounts.
System Refrigerant Charge Calculator (lbs.).
Job Name_______________________________________
System Tag or ID___________________________________
Project Manager__________________________________
Date___________________________________________
Line #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
Description
Linear feet of 1/4" liquid line tubing2
Linear feet of 3/8" liquid line tubing2
Linear feet of 1/2" liquid line tubing2
Linear feet of 5/8" liquid line tubing2
Linear feet of 3/4" liquid line tubing2
Linear feet of 7/8" liquid line tubing2
Linear feet of 1" liquid line tubing2
Wall Mounted + Art Cool Mirror
Wall Mounted + Art Cool Mirror
1-Way Cassette
2-Way Cassette
4-Way 2' x 2' Cassette
4-Way 2' x 2' Cassette
4-Way 2' x 2' Cassette
4-Way 3' x 3' Cassette
4-Way 3' x 3' Cassette
4-Way 3' x 3' Cassette
4-Way 3' x 3' Cassette
4-Way 3' x 3' Cassette
High Static Ducted
High Static Ducted
High Static Ducted
High Static Ducted
Low Static Ducted, Low Static Ducted Bottom Return
Low Static Ducted, Low Static Ducted Bottom Return
Vertical / Horizontal Air Handling Unit
Vertical / Horizontal Air Handling Unit
Vertical / Horizontal Air Handling Unit
Vertical / Horizontal Air Handling Unit
Ceiling Suspended
Convertible Surface Mount—Ceiling/Wall
Floor Standing
Floor Standing
Additional Refrigerant Charge Required
Chassis I.D.
—
—
—
—
—
—
—
SE
S8, S5
TJ
TL
TR
TR
TQ
TN
TM
TP
TN
TM
BH
BG
BR
B8
B1, B3
B2, B4
NJ
NJ
NJ
NK
VJ
VE
CE (U)
CF (U)
1
2
Quantity
CF (Ref.)1
0.015
0.041
0.079
0.116
0.179
0.238
0.323
0.53
0.62
0.44
0.35
0.40
0.55
0.71
1.06
1.41
1.06
1.41
1.41
0.57
0.97
1.37
2.20
0.37
0.82
1.04
1.04
1.57
2.00
0.77
0.22
0.37
0.82
36a ARWN038GA2
38,200
2.2
36b ARWN048GA2
47,800
2.2
36c
ARWN053GA2
52,900
2.2
Total System Charge: Sum of Additional Refrigerant Charge Required and Total Factory Refrigerant Charge
35a-c Water source unit Factory Refrigerant Charge
36
Size
—
—
—
—
—
—
—
7k to 15k
18k to 24k
7k to 12k
18k to 24k
5k to 7k
9k to 12k
15k to 18k
9k to 15k
18k to 24k
24k to 28k
36k
42k to 48k
7k to 24k
15k to 42k
48k to 54k
76k to 95k
7k to 15k
18k to 24k
12k to 24k
30k
36k
42k to 54k
18k to 24k
9k to 12k
7k to 15k
18k to 24k
CF (Ref.) = Correction Factor for Refrigerant Charge.
For refrigerant charge purposes, consider only the liquid line; ignore the vapor line(s).
Total (lbs.)
For further technical materials such as submittals, engineering
manuals, service manuals, and catalogs, visit www.lg-vrf.com.
20001747
ISO 9001: 2008
LG ELECTRONICS INC.
LG Electronics, U.S.A., Inc.
Commercial Air Conditioning Division
4300 North Point Parkway
Alpharetta, Georgia 30022
www.lg-vrf.com
LG Customer Information Center, Commercial Products
1-888-865-3026 USA
Follow the prompts for commercial A/C products.
IM_MultiVWaterMini_5_16
Supersedes VRF-IM-BM-001-US 013L26
VRF-IM-BM-001-US 013H09
Download PDF

advertising