Service; Service Actions - Nibe VPB Series Installer Manual

7 Service

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.
16 Chapter 7 | Service
Emptying
The water heater is emptied through the siphon (with
hose) in the cold water connection (XL3).
Drain the charge coil through the siphon (with hose) on
the docking connection, return to heat pump (XL9).
Drain the solar coil through the siphon (with hose) on
the connection, return to solar heating system (XL14).
VPB 200/VPB 300
VPBS 300
VPB/VPBS