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WATER CIRCUIT INSTALLATION
Piping System Specifications
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 must be wired to terminals L1 and L2 on the water source unit PCB as shown in the following figure.
Water
Water
In
Out
C_Box
Field-supplied solenoid valve must be a normally closed type.
DANGER
High voltage electricity is required to operate this system.
Flow Switch
Adhere to the U.S. National Electric Code NEC 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.
Solenoid
Valve
Remove water source unit input power before performing this
procedure.
Electrical shock can cause physical injury or death.
Figure 18: Flow Switch and Solenoid Valve Wiring
Water
Water
In
Out
C_Box
Flow Switch
Solenoid
Valve
Remove water source unit power and set the PCB DIP switches as shown in the following figure.
Figure 19: WSU DIP Switch Settings for Solenoid Valve Control by WSU
ON
OFF
1
2
3
4
5
6
7
© LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. "LG" is a registered trademark of LG Corp.
52 | LOOP CIRCUIT DESIGN
CN_26
MAIN PCB
CN_24
CN_22
Properly size all circuit breakers or fuses.
INTERNET
There is risk of fire, electric shock, explosion, physical injury or death.
Do not share the electrical circuit with other devices.
There is risk of fire, electric shock, and physical injury or death due to
heat generation.
1(L) 2(N) 3(L) 4(N) 5(A) 5(B)
Do not use damaged or loose power wiring.
modify or extend the outdoor unit's power wiring randomly.
Ensure that the power wiring will not be pulled nor weight be
DDC
BMS
placed on the power wiring during operation.
There is risk of fire, electric shock, and physical injury or death.
CN_26
MAIN PCB
CN_24
CN_22
1(L) 2(N) 3(L) 4(N) 5(A) 5(B)
ON
OFF
1
2
3
4
5
6
7
Variable Water Flow Valve Control Kit PWFCKN000 (Optional)
When entering water temperature is lower than 59ºF, variable water flow control kit PWFCKN000 is required. LG recommends installing a
variable water flow control kit on each water source unit.
• Field-supplied modulating water control valve must be 24V, normally-closed.
• Minimum flow rate cannot be less than 40% of normal flow rate.
• Variable flow control kit sends 0–10 volt signal to the modulating valve. 10 volts is full open valve position. As building load drops and com-
pressor slows, the signal reduces to close the valve. 1 volt is the minimum flow position of 40% of rated flow. Zero volts is valve fully closed.
Variable Water Flow Valve Control Kit Installation Steps
1. Remove power from the water source unit.
2. Install the transformer, I/O module, and terminal block inside the water source unit chas-
sis. Secure components with screws.
3. Connect component wiring as shown in the following fFigure 20.
4. Position DIP switch 5 (function 4) to the ON position.
Do not
5. Reconnect water source unit power.
Figure 20: Variable Water Flow Valve Control Kit
BL=blue; BR=brown; RD=red; BK=black; WH=white; GR=green
© LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. "LG" is a registered trademark of LG Corp.
WATER CIRCUIT INSTALLATION
Piping System Specifications
DANGER
High voltage electricity is required to
operate this system. Adhere to the U.S.
National Electric Code NEC and these
instructions when wiring.
Improper connections and inadequate ground-
ing can cause accidental injury or death.
Always ground the unit following local,
state, and NEC codes.
There is risk of fire, electric shock, and physi-
cal injury or death.
Remove water source unit input power
before performing this procedure.
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.
Do not share the electrical circuit
with other devices.
There is risk of fire, electric shock, and physi-
cal injury or death due to heat generation.
Do not use damaged or loose power
wiring.
Do not modify or extend the
outdoor unit's power wiring randomly.
Ensure that the power wiring will not
be pulled nor weight be placed on the
power wiring during operation.
There is risk of fire, electric shock, and physi-
cal injury or death.
LOOP CIRCUIT DESIGN | 53
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