2Way Valve; General Information; How To Wire 2Way Valve; Final Check - LG THERMA V Air-to-Water Heat Pump Installation Manual

2Way Valve

2way valve is required to control water flow while cooling operation. Role of 2way valve is to cut off
water flow into under floor loop in cooling mode when fan coil unit is equipped for cooling operation.

General Information

supports following 2way valve.
Type Power
NO 2-wire 230V AC
(1)
NC 2-wire 230V AC
(2)
(1) : Normal Open type. When electric power is NOT supplied, the valve is open. (When electric
power is supplied, the valve is closed.)
(2) : Normal Closed type. When electric power is NOT supplied, the valve is closed. (When electric
power is supplied, the valve is open.)

How to Wire 2Way Valve

Follow below procedures Step 1 ~ Step 2.
Step 1. Uncover front cover of the indoor unit and open the control box.
Step 2. Find terminal block and connect wire as below.
2WAY VALVE
(A)
14 15 16
L1 L2 N
BR WH BL
(NO) (NC) (N)
2way valve
(NO) : Live signal (for Normal Open type) from PCB to 2way valve
(NC) : Live signal (for Normal Closed type) from PCB to 2way valve
(N) : Neutral signal from PCB to 2way valve

Final Check

• Flow direction :
- Water should not flow into under floor loop in cooling mode.
- To verify the flow direction, check temperature at the water inlet of the under floor loop.
- If correctly wired, this temperatures should not be approached to 6°C in cooling mode.
Operating Mode
Closing water flow
Opening water flow
Closing water flow
Opening water flow
Dew Condensation
• Wrong wiring can yield dew condensation on the floor. If radiator is
connected at the under floor water loop, dew condensation can be
occurred on the surface of the radiator.
Wiring
• Normal Open type should be connected to wire (NO) and wire (N)
for valve closing in cooling mode.
• Normal Open type should be connected to wire (NO) and wire (N)
for valve closing in cooling mode.
Accessories Installation
Supported
Yes
Yes
Yes
Yes
Installation Manual 69