LG Hydro Kit ARNH10GK2A4 Installation Manual page 17

WARNING :
Installing recirculation pump
When Hydro Kit is used with the sanitary water tank, it is STRONGLY recommended to install
recirculation pump to prevent cold water at the end of hot water supply flooding out and to
stabilize the water temperature inside the sanitary water tank.
- The recirculation pump should be operated when sanitary water 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 * V / 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 Out
Water In
Hot water supply
City water
Sanitary water
(DHW) tank
Shower
(End of Hot
water supply)
Recirculation
Pump
Hydro Kit Installation Manual 17
Installation
External
Time Scheduler