Description Of The Operational Types And Their Parameters; Defrosting - Viessmann FT 0700 Assembly And Operation Manual

8.2 Description of the operational types and their
parameters

8.2.1 Defrosting

During the defrosting process, the display shows either
Abt or dEF or dEg.
Defrosting occurs generally by means of the electrical
heating. On completion of defrosting, the compressor
switches itself on after the time given in P40 for drainage.
The evaporator fan starts if the evaporator temperature
entered in P41 is not exceeded, or if the time entered in
P35 is completed following activation of the compressor.
The evaporator temperature can be shown in P08. If no
temperature sensor is connected to the evaporator, P08
will show „OFF".
Defroster operational types
Using the P30 parameter, the type of operation of the
defroster can be selected.
- Defrosting initiated in a constant cycle
P30 =x0
Defrosting will be initiated if the time entered in P03 has
elapsed since the initiation of the last cycle.
Defrosting is completed if the evaporator temperature
exceeds the value entered in P39, or if the defrosting
time exceeds the value in P04.
- Defrosting initiated dependent on the running time
of the compressor
P30 = x1
At the end of defrosting, the running time of the
compressor is set to 0. When the running time of the
compressor reaches the value entered in P03, defrosting
is initiated.
Defrosting is completed when the evaporator
temperature exceeds the value entered in P39, or if the
defrosting time exceeds the value entered in P04.
General notice (liability): the details of this technical documents serve for description. Consents regarding the availability of certain features or
regarding a certain purpose always require a special written agreement.
Page 19 GB
- Defrosting is initiated at set times
P30 = x2
Defrosting is initiated if the internal clock reaches one of
the values entered in the parameters P12 – P23. If one of
the values in P12 – P23 is at OFF, this switch- on time is
skipped.
Defrosting is ended when the evaporator temperature
exceeds the value entered in P39, or if the defrosting
time entered in P04 is exceeded.
This parameter is only available if a regulator with DCF
signal receiver is connected.
- Defrosting is initiated dependent on the degree of
icing of the evaporator.
P30 = x3
The defrosting starts, if the evaporator temperature is
below the ambient temperature less the value entered in
P38.
Example:
Coldroom temperature = 5°C, P38 = 25
The defrosting starts, if the evaporator temperature falls
under -20°C.
For safety reasons, defrosting will also be initiated if the
running time of the compressor exceeds the value
entered in P03. It is therefore recommended that the
value of approx 10 hours be entered in P03.
Defrosting is ended when the evaporator temperature
exceeds the value entered in P39, or if the defrosting
time exceeds the value entered in P04.
- Additional defrosting is initiated if the coldroom
door is open for more than four minutes.
P30 = 1y
Defrosting will be initiated in addition to the type of
operation entered in the value y if the fault „coldroom
door open" is displayed.
8.2 - 8.2.1
GB
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