Nibe F370 User Manual page 22

Check pressure
F370 has a pressure gauge which shows the heating system pressure.
The pressure should be between 0.5 and 1.5 bar, but varies during
temperature changes. If the pressure drops to 0 or rises to 2.5 frequently,
contact your installer for troubleshooting.
Safety valves
F370 has two safety valves, one for the hot water heater and one for
the climate 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
closed and must not normally 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.
Check that water flows through the valve.
2.
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".
22 Chapter 2 | The heat pump – the heart of the house
Pressure gauge
NIBE F370