Dantherm DCU22-2000DH, Руководство по обслуживанию

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Alarms
Alarms will send out the alarm to the WSM detection through relay.
A fast flashing fail LED (app. 2 Hz or 2 times per second), will indicate an alarm.
The alarm situation will be initiated by the following incidences:
1
、
The internal DC fan is stopped----no rotational pulse.
2
、
The condenser fan is faulty----doesn’t use current.
3
、
The compressor doesn’t draw current----this due a dropout in the HP/ LP pressure switch, the
winding protector or the compressor in general.
4
、
Failure on the return air sensor----open or short.
5
、
Failure on the supply air sensor ---- open or short.
6
、
The ambient temperature is high----indication in a possible fire. Alarm is above 70
℃
, off below
60
℃
.
A fast flashing fail LED----app. 2 Hz (2 per second) ----is indicating an alarm.
Sensor failure handling
Temperature measurements are performed in the range from -40
℃
to +99
℃
. Readings outside this
range is regarded as a sensor failure. -40
℃
is regarded as a short circuit and +99
℃
is regarded as a
missing sensor or open loop.
Return air sensor
A faulty return air sensor will result in the main controlling sensor being regarded as supply sensor
with a possible offset. The real measurement of the supply sensor is used during heating. An offset of
10
℃
is added during active cooling.
Supply and ambient air sensor
The ambient air is always regarded as efficient if the supply or the ambient air sensor is defective.
Condenser sensor
A faulty condenser sensor will result in a fixed medium speed of the condenser fan when operated.