Siemens RVS41.813 User Manual page 132

TA
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Diff = 0
B91
B84
1
Y22
0
1
K19
0
1
K1
0
Defrost end when
defrosting through
process reversal
Defrost end when
defrosting with the fan
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Siemens Switzerland Ltd
HVAC Products
[8478]
[8477]
[2963]
[2962]
B91 Source inlet temp
B84 Evaporator temp
Y22 Process reversing valve
K19 Fan source inlet
K1 Compressor 1
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.
User manual RVS61.843, RVS41.813
6 The settings in detail
Start defrosting
d f ti
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2951
2952 OEM
2953 OEM
2954 OEM
2959 OEM
2962
2963
2965
2966 OEM
8477
8478
Start defrosting
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[2952]
Actual diff ice free
[2954]
[2951]
[2963]
[2962]
Defrost release below OT
Swi diff defrost
Temp diff defrost max
Evapor temp defrost end
Defrost settling time
Duration defrost lock
Time up to forced defrost
Dripping time evapor
Cooling down time
Temp diff defrost act value
Temp diff defrost setpoint
CE1U2355en_02
28. September 2009
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