How To Wire Thermostat - LG THERMA V Air-to-Water Heat Pump Installation Manual

Accessories Installation
Choosing Heating / Cooling Thermostat
• Heating / Cooling Thermostat must have ʻMode Selectionʼ feature to distinguish operation mode.
• Heating / Cooling Thermostat must be able to assign heating target temperature and cooling
target temperature differently.
• If above conditions are not kept, the product can not operation properly.
• Heating / Cooling Thermostat must send cooling or heating signal immediately when temperature
condition is satisfied. No delay time while sending cooling or heating signal is permitted.

How to Wire Thermostat

Follow below procedures Step 1 ~ Step 6.
Step 1. Uncover front cover of the indoor unit and open the control box.
Step 2. Identify the power specification of the thermostat. If it is 230V AC, go to Step 4. Otherwise, if
it is 24V AC, go to step 3
Step 3. Find thermostat connecting cable A and C. Disconnect cable A and C, then connect cable B and C.
A A
1Ø Electric Heater
Step 4. If it is Heating Only Thermostat, go to step 5. Otherwise, if it is Heating / Cooling Thermostat,
go to step 6.
Step 5. Find terminal block and connect wire as below. After connecting, go to step 6.
THERMOSTAT
(Default : 230V AC)
17 18 19
L N L1
BR BL WH
(L) (N)
Thermostat
Heating Only Thermostat
(L) : Live signal from PCB to Thermostat
(N) : Neutral signal from PCB to Thermostat
(H) : Heating signal from Thermostat to PCB
60 Air-to-Water Heat Pump
Second: Second: Second:
Connect B Connect B Connect B
B B
and C and C and C
C C
First: First: First:
Disconnect A Disconnect A Disconnect A
and C and C and C
Mechanical type Thermostat
20
Do not connect wire (N) as mechanical type thermostat does not
L2
require electric power supply.
BK
(H)
Do not connect external electric loads
Wire (L) and (N) should be used only for operation Electric type thermostat.
Never connect external electric loads such as valves, fan coil units, etc.
If connected, PCB of the indoor unit can be seriously damaged.
Secont : Secont : Secont : Secont : Secont :
Disconnect B Disconnect B Disconnect B Disconnect B Disconnect B
and C and C and C and C and C
A A
B B
First : First : First : First : First :
Disconnect A Disconnect A Disconnect A Disconnect A Disconnect A
and C and C and C and C and C
3Ø Electric Heater
C C