Protection Modes; Anti-Freeze Protection - Bosch HP270-2 Technical Manual

Boost Mode
Conditions

2.2) Protection Modes

Anti-Freeze Protection

The anti freeze protection is designed to protect both the module and the tank and is active in all conditions,
specially, when the appliance is set in Heat Pump, standby, OFF and Holyday (Hol) modes.
Note: In order to ensure the anti freeze protection activation, the mains plug must not be disconnected.
Module Protection
Start Up Condition:
T < 4ºC
Bottom
Tank Protection
Start Up Condition:
T < 5ºC
top
Only HP270-3 and HP200/250-1:
Integrated E-Heater in module
Pump + Electric
Heater ON
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ON if compressor is
ON:
Note: If Duct On and T
starts 2 min before and T
compressor and if
Duct Off starts 1 min
before compressor in
order to update air
temperature value
Table 3 – Operation Modes Conditions
Pict.6 – Heat Pump Diagram (Model HP270-2: -10ºC / +35ºC)
6-720-821-364 SM HP270 – 250 - 200 2016/12 en
ON if -10ºC < OFF
T < +35ºC
air
< 61ºC
dis
< 58ºC
top
ON if ON
compressor is
ON
or
ON if E-heater
ON when
compressor is
OFF
Module Protection
Stop Condition:
Until T > 6ºC + Water Pump
bottom
ON during 1 min
Tank Protection
Stop Condition:
E-Heater ON until T
top
(not in case of Full or Legionela activation)
Pump + Electric Heater ON
> 8ºC