York
YO62 4LL
Biotech PZ25RL pellet boiler service.
The heating pump worked independently from the boiler and was able to cool down the buffer to a very low temperature. In this case the built in heat exchanger in the buffer was not able to produce hot water.
To solve this problem a capillary thermostat has been installed which blocks the heating if the buffer is too cold to make it possible for the boiler to keep the buffer hot.
Instruction Manual Biotech_Pellet PZ25RL
