The safety valve must be checked about four times a year. The safety valve
is reached by removing the main cover.
1.
Open the valve by turning the knob anti-clockwise carefully.
2.
Check that water flows through the overflow pipe. When water stops
coming out of the overflow pipe the valve is defective and must be
replaced.
3.
Close the valve by releasing it. If it does not close automatically when
released, turn it anti-clockwise slightly.
The safety valve sometimes releases a little water after hot water has been
used. This discharge is caused by the expansion through heating of cold
water entering the water heater, resulting in a pressure increase, whereby
the safety valve opens.
Emptying
Drain the heat pump of water as follows:
1.
Switch off the circuit fuse or pull out the plug.
2.
Open the shut-off valve (turn anti-clockwise).
3.
Open the safety/drain valve (turn the knob slowly anti-clockwise until
it remains in the raised position).
4.
Ensure air supply by opening all hot water taps.
Caution
The heat pump is started when the supply cable is connected to an
earthed socket.
19NIBE™ F110Chapter 2 | The heating installation – the heart of the house
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