29
models use electric expansion valve. The controlling is too
complicated, and users needn’t know this, so we don’t introduce
here.
⑧ Return water valve
Only HW, HT series has return water valve function.
8.1
Condition of return water valve open (all below condition
should be met):
8.1.1
Low water level switch connects
8.1.2
Water tank temp ≥L6 + 5
8.1.3
Return water temp ≤ L6 – 5
8.2
Condition of return water valve closes (any below condition
met):
8.2.1
Low water level switch disconnects
8.2.2
Water tank temp < L6 + 5
8.2.3
Return water temp > L6
⑨ Cool water compensating valve
Only HW, HT series have cool water compensating valve function.
(When L7=20
℃
, cool water compensating function is invalid)
9.1
After compensate cool water manually, before high water level
switch connects, the cool water compensating valve opens all the