Nibe VPD 150, Руководство по установке, Страница: 15 / 20

Service actions
Safety valve
The water heater's safety valve sometimes releases a
little water after hot water usage. This is because the
cold water, which enters the water heater to replace
the hot water, expands when heated causing the
pressure to rise and the safety valve to open.
The function of the safety valve must be checked regu-
larly. Perform checks as follows:
1. Open the valve by turning the knob anti-clockwise
carefully.
2. Check that water flows through the valve.
3. Close the valve by releasing it. If it does not close
automatically when released, turn it anti-clockwise
slightly.
Emptying
The water heater is emptied by opening the safety valve
and a tap near the heater. If this is not sufficient, the
compression ring coupling by (XL3) can be released
carefully.
13 Chapter 7 | Service VPD 150, 300
7 Service