HWP30N/HWP40N Forced Circulation Heater User Manual Page 11 of 14
6.
USE AND MAINTENANCE
1)
After it is connected with power, heater is at stop state. Press Auto/Heat and make heater enter
working status.
2)
When it needs to be checked/fixed or change pipe or some part, press Stop and make heater enter
stop status.
3)
Before start please confirm whether heater is fully filled with coolant and make gas in the pipe
exhausted by vent valve.
4)
It is strongly suggested to use antifreeze with corresponding mark number.
5)
If ordinary water is used, users must drain the water after stop when environment temperature is
below 0ºC, in order to prevent the water in the heater getting frozen and resulting in heater fracture.
6)
GND wire must be earth connected.
7)
Drain valve: Can be opened or closed using hexagonal wrench, adjustable wrench, or a cross
screwdriver.
Fig.4 Vent Valve Indicating Diagram
Fig.5 Wire Connection
(Unit: mm)
Fig.6 Vent Valve Size
