LG THERMA V Installation Manual page 111

WARNING
!
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 x R
k : 1.2 ~ 1.5 is recommended. (If distance between pump and tank is far, then choose high
number)
V : Volume of sanitary water 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 sanitary water demand.
Water In
Water Out
Hot water supply
Recirculation
Pump
DHW Tank
Check Valve
City water
ACCESSORIES INSTALLATION
Shower
(End of Hot
water supply)
External
Time Scheduler
111