Maintenance of F1255
Regular checks
Your heat pump is, in principle, maintenance free and therefore requires
minimal care after commissioning. On the other hand, it is recommended
that you check your installation regularly.
If something unusual occurs, messages about the malfunction appear in
the display in the form of different alarm texts. See alarm management
on page 67.
Level vessel
The brine that obtains the heat in the ground is not normally
consumed but just pumped around. In most installations,
there is a level vessel where you can check if there is sufficient
fluid in the system. Ask your installer if you are unsure where
the level vessel is located. The level can vary due to the fluid’s
temperature. If the level is below 1/3 topping up is required.
Contact your installer for assistance with filling.
1/3
LEK
Expansion vessel
The brine that obtains the heat in the ground is not normally
consumed but just pumped around. In some installations
there is an expansion tank instead of a level vessel (for ex-
ample, where the heat pump is not at the highest point in the
brine system) where the system pressure can be checked. Ask
your installer if you are unsure where the expansion tank is
located. The pressure can vary due to the fluid’s temperature.
The pressure should not fall below 0.5 bar. Contact your in-
staller for assistance with filling.
LEK
Safety valve
The function of the safety valve must be checked regularly. You can find
the safety valve on the incoming pipe (cold water) to the water heater.
Perform checks as follows:
1. Open the valve by turning the knob anti-clockwise carefully.
2. Check that water flows through the valve.
NIBE™ F1255Chapter 2 | The heat pump – the heart of the house20
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