Air Defrost Sequence - Bosch HP270-2 Technical Manual

Changes in Air Defrost sequence
o
(Attention: only +5ºC / +35ºC model)
Current Behaviour:
Air defrost sequence is activated when 5ºC < T
60 min. the nº of cycles depends on detection of following additional conditions.
Fan ON during 10 min
New Behaviour (only in HPAF0703):
In addition to current function in +5ºC / +35ºC models an additional air defrost sequence is programmed. When 0ºC
< T (3d) < + 5ºC will last for more than 60 min and compressor is ON for more than 60 min, the evaporator defrost
air
will start. The fan will run during 45 min to defrost evaporator and in the meanwhile the electric heater will heat up
the water.
Fan ON during 45 min
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< 10ºC for more than 60 min and compressor is ON for more than
air
Condition (HPAF0702 / HPAF0703):
T
bottom
Or
T - T
air
(defrost every 90 min)
Compressor OFF
Pict.8 – Air Defrost Sequence
Condition (HPAF0703 + 1701 + 2701):
Compressor is ON for more than 60 min and
T -T > 3.5ºC for more than 1 min or T fins < -17ºC
air fins
Compressor OFF
Pict.9 – Air Defrost Sequence
6-720-821-364 SM HP270 – 250 - 200 2016/12 en
< 20ºC
> 6ºC
fins
T
Water Pump OFF
bottom
Water Pump OFF