35
Maintenance
Expansion vessel
A plastic expansion vessel is connected to the heat pump heat transfer
circuit (collector circuit). The level in the expansion vessel should not fall
below the minimum level of 1/3 of the volume in the vessel.
The heat pump
must
be operating all the time while fi lling.
1. Remove the plug from the valve on top of the tank. Now carefully open
the valve (fi gure 1).
2. Check that the valve is fully open (fi gure 2).
3. Fill with anti-freeze or water (to 2/3) with a clean watering can or
similar (fi gure 3).
4. Close the valve and refi t the plug (fi gure 4).
Figure 1
Figure 2
Figure 3
Figure 4
Max. level
Min. level
