LG THERMA V HN0613M Installation Manual page 89

Installing recirculation pump
When is used with DHW tank, it is STRONGLY recommended to install recirculation
pump to prevent flooding out cold water at the end of hot water supply and to stabilize the water
temperature inside DHW tank
- The recirculation pump should be operated when DHW demand is not required. Therefore, external
time scheduler to determine when the recirculation pump should turn on and turn off is required.
- The operating duration time of the recirculation pump is calculated as follow :
Duration time [minute] = k x V / R
k : 1.2 ~ 1.5 is recommended. (If distance between pump and tank is far, then choose high
number)
V : Volume of DHW tank [liter]
R : Water flow rate of pump [liter per minute], which is determined by pump performance curve.
- The pump operating start time should be prior to the DHW demand.
Remote Controller
Water In
Water Out
※ Water In / Water Out installation scene may vary depending on the model.
How to wire recirculation pump
Follow below procedures step 1 ~ step 4.
Step 1. Check if the power of the unit is turned off.
Step 2. Disassemble front panels and distinguish
control box(Indoor) of the unit.
Step 3. Check if the harness(Violet) is inserted fully
to the indoor unit PCB (CN_PUMP_A15).
Step 4. Connect the DHW recirculation pump to
terminal block 1(3/4).
CAUTION
!
When connecting a pump of 1.05A or higher, its output must be used as a signal line only.
OK
Hot water supply
DHW Tank
City water
ACCESSORIES INSTALLATION
Shower
(End of Hot
water supply)
Recirculation
Pump
Check Valve
Indoor PCB Indoor PCB
CN_PUMP_A15
89
3 4
L N
WATER PUMP(C)
Recirculation Pump
AC 230 V