Siemens Albatros2 AVS37 User Manual Page 125

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Siemens Schweiz AG Basic units RVS61.843 and RVS41.813 CE1U2355en_02
Landis & Staefa Division The settings in detail 3. Juli 2008
2965
2963
2962
8478
2951
2959 OEM
(2963)
(2962)
8477
2952 OEM
8477
2954 OEM
8478
t
°C
1
0
2355Z16
1
0
1
0
Y22
B91
K19
K1
B84
B91 Source inlet temp 2951 Defrost release below OT
B84 Evaporator temp 2952 OEM Swi diff defrost
Y22 Process reversing valve 2954 OEM Evapor temp defrost end
K19 Fan source inlet 2959 Defrost settling time
K1 Compressor 1 2962 Duration defrost lock
2963 Time up to forced defrost
2965 Dripping time evapor
8477 Temp diff defrost act value
8478 Temp diff defrost setpoint
When defrosting is successful, the evaporator temperature (B84) rises. If the
evaporator temperature exceeds “Evapor temp defrost end“ (2954 OEM), the defrost
process can be successfully completed and the compressor is switched off during the
dripping time (2965). Then, heating mode is resumed.
Defrosting with the fan is considered completed when one of the 2 following conditions
is satisfied:
The temperature difference (8477) between incoming outside air (B91) and
evaporator (B84) is smaller than that set by your supplier
When defrosting with the fan, the defrost time is reached
The defrost process at low outside temperatures takes more time than at higher outside
temperatures.
Heating mode is resumed after successful completion of the defrost process either
through process reversal or with the fan. “Duration defrost lock“, “Time up to forced
defrost“ and “Defrost settling time“ (2959 OEM) start to run again.
On completion of “Defrost settling time“ (2959 OEM), “Temp diff defrost icefree“ is
acquired and used to generate the new setpoint (8478).
When there is a heat pump lock pending, any active defrost process is completed.
Defrosting by reversing the process can also be accomplished manually, either via
input Ex1..7 or via the operating line (7152). With manual defrosting, no consideration
is given to the release temperature (2951) and to “Duration defrost lock“ (2962).
Defrost end when
defrosting through
process reversal
Defrost end when
defrosting with the fan
Resuming heating
mode and preparing
the next defrost
process
Manual defrost
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