LG THERMA V HA031M E1 Service Manual page 8

n How to Wire 3Way Valve For Bypass
3WAY VALVE (For Backup heater Bypass)
Follow below procedures Step 1 ~ Step 2.
Step 1. Uncover front cover of the unit.
Step 2. Find terminal block and connect wire as below. (in the unit)
18 19 20
L1 L2 N
2WAY VALVE
(A)
(NO) (NC) (N)
3way valve
(1) : Flow A means 'water flow from the unit to Buffer tank . (Cooling)'
(2) : Flow B means 'water flow from the unit to Backup heater. (Heating)'
WARNING
• When type of 2way valve is NO type, 3way valve should select Flow A (bypass) when electric power is sup-
plied to wire (NO) and wire (N).
• When type of 2way valve is NC type, 3way valve should select Flow A (bypass) when electric power is sup-
plied to wire (NC) and wire (N).
CAUTION
• 3Way valve should be connected together with 2Way valve in terminal block.
• Keep the distance between 3Way valve and backup heater more than 0.5m.
• To prevent reverse flow, It is important to use one way valve(check valve) to Backup heater water outlet.
Final check
• Flow direction
- Water should not flow into Heater loop (B) in cooling mode.
- If correctly wired, this temperatures should not be approached to 6°C in cooling mode.
• 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 seconds.
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