Heat Pump Control Settings Power-Off Compressor - Viessmann VITOCAL 242-G Installation And Service Instructions Manual

Heat pump control settings
Power-OFF compressor
With activated power-OFF ("power-OFF: YES") the power supply utility can
switch off the heat that is being generated by the heat pump. This requires
that the power-OFF contact has been connected (see page 71).
The heat distribution by the heating circuit pump and the circulation pump for
cylinder heating are not affected by the power interruption.
If power-OFF has been activated, a buffer cylinder must be installed to cover
the periods during which no heat can be generated.
Note
The effect of the power interruption on the instantaneous heating water hea-
ter is determined separately (see page 155).
Access
"Device settings"
"Programming"
"Heat pump"
"Power-OFF" ("YES"/"NO")
Maximum flow temperature
Setting the maximum heat pump flow temperature.
Access
"Device settings"
"Programming"
"Heat pump"
"Max. flow temp." (1/!)
Minimum return temperature
Not the heat pump but the instantaneous heating water heater is started when
the actual temperature drops below the minimum return temperature.
The instantaneous heating water heater stays ON until the minimum return tem-
perature has been achieved.
150
Standard setting
Setting range
Standard setting
Setting range
YES
YES/NO
60 °C
25 to 60 °C