Safety valves
F470 has two safety valves, one for the water heater and one for the heating
system.
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,
expands when heated causing the pressure to rise and the safety valve to
open. The climate system's safety valve must be completely sealed and not
release any water.
The function of the safety valves must be checked regularly. The valves are
accessed via the service hatch. 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.
4.
The climate system may need to be refilled after checking the safety valve,
see the section “Filling the climate system”.
F470, copper
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21NIBE™ F470Chapter 2 | The heat pump – the heart of the house
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