3Way Valve; How To Wire 3Way Valve; Final Check - LG Therma V Series Installation Manual

3Way Valve

How to Wire 3Way 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.
3WAY VALVE
(A)
8 9 10
L L1 N
BR WH BL
(W) (U) (N)
3way valve
(W) : Live signal (Water tank heating) from PCB to 3way valve
(U) : Live signal (Under floor heating) from PCB to 3way valve
(N) : Neutral signal from PCB to 3way valve

Final Check

• Flow direction :
- Water should flow from water outlet of the indoor unit to sanitary tank water inlet when sanitary
tank heating is selected.
- To verify the flow direction, check temperature at the water outlet of the indoor unit and water inlet
of sanitary water tank.
- If correctly wired, these temperatures should be almost equivalent if thermal insulation of water
pipe is well performed.
• Noise or water pipe vibration while 3way valve operation
- Due to surging effect or cavitation effect, noise or water pipe vibration can be occurred while
3way valve is operating.
- In that case, check followings :
• Is water circuit (both under floor water loop and sanitary water tank loop) fully charged? If not,
additional water charging is required.
• Fast valve operation yields noise and vibration. Appropriated valve operating time is 60~90 sec-
onds.
WARNING
• 3way valve should select water tank loop when electric power is
supplied to wire (W) and wire (N).
• 3way valve should select under floor loop when electric power is
supplied to wire (U) and wire (N).
Accessories Installation
Installation Manual 67