Firmware V3.15
21.04.2021
34/401
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Controller type
Required sensors
Allocated defrost relay
UA 111 / UA 141
R2.1 R2.2
Defrost relay 1
R2.3 R2.4
Defrost relay 2
UA 121
R1.1 R1.2
Defrost relay 1
R1.3 R1.4
Defrost relay 2
UA 131 / UA 131 DD
R1.1
Defrost relay 1
R1.2
Defrost relay 2
R1.3
Defrost relay 3
R1.4
Defrost relay 4
UR 141 NK(NT) / UR 141 TK(LT)
R1.1 R1.2
Defrost relay 1
R1.3 R1.4
Defrost relay 2
Defrost initiation
Defrosting can be initiated by four methods:
By internal clock (not UA 131 DD)
Using an external timer
via digital input D11/D12 (factory setting).
A further defrost can only be initiated after the end of the safe defrost time (defrost parameters),
even when the defrost has already been terminated via the evaporator temperatures. Defrosting
should be timed to take place between 0200 and 0300 hours where possible so as to avoid
problems of missed or duplicated defrosting when changing to or from daylight saving time.
Warning – hazardous electrical voltage! Danger of electric shock! BEFORE
connecting and
disconnecting it must be checked that the 230 V AC digital inputs are off load! The controller and
connected voltage carrying components remain supplied with power!
Summary of Contents for UA 400
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Page 361: ...Firmware V3 15 21 04 2021 361 401 FANS 2 Pos XXXXX Fan Delay Fan delay ...
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