LG THERMA V Installation Manual page 83

How to Wire Mix Pump, Mixing Valve and Thermistor for 2nd Circuit
Follow below procedures Step 1 ~ Step 3.
Step 1. Uncover front cover of the unit.
Step 2. Find terminal block and connect wire as below
7 8 9 10
L N L1 L2
MIX
MIXING VALVE
PUMP
(L) (N) (L1)
MIX
MIXING VALVE
PUMP
Step 3. Insert the temperature sensor to 'CN_MIX_OUT' (Brown) of the main PCB as shown
below. The sensor should be mounted correctly to outlet pipe of mix kit water pump as
shown below.
Indoor PCB
NOTE
2nd circuit temp. sensor is an accessory. (Model: PRSTAT5K10)
CAUTION
!
When connecting a pump of 1.05A or higher, its output must be used as a signal line only.
11 (L) : Live signal from PCB to mix pump
N
(N) : Neutral signal from PCB to mix pump
(L1) : Live signal (for Normal* Closed type) from
PCB to mixing valve
(L2) : Live signal (for Normal Open type) from PCB
(L2) (N1)
to mixing valve
(N1) : Neutral signal from PCB to mixing valve
*Closed = NOT Mixed
Buffer
Tank
ACCESSORIES INSTALLATION
CN_MIX_OUT
[Circuit 2] Mixing Circuit
Mix
Mix Kit
[Circuit 1] Direct Circuit
Hydronic
separator
2 circuit temp. sensor
nd
Floor Floor
heating loop heating loop
Radiator Radiator
83