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EVAPORATOR FREEZING
Logical variable : DGELn
Incident codes KP02 : n2
KP07 icon :
Description
This fault is only processed on machines cooling water without solution which does not freeze at 0°C
(glycol or brine)
Case ¶ : Tubular exchangers
A compressor m on circuit n has been operating for at least 1 minute and the following 2 conditions
remain satisfied for over 2 minutes:
TBPn < TBPI and TASPn < +5°C
Case · : Plate exchangers
A compressor m on circuit n has been operating for at least 2 minutes and :
TBPn < TBPI for over . 5 seconds for R407C units
. 30 seconds for R22 units.
With : TBPn ó Evaporation temperature circuit n (°C)
TBPI ó Minimum evaporation temperature (°C)
The minimum (and default) value of instruction TBPI is defined as follows :
. Tubular evaporators ð -4°C
. R407C plate evaporators ð +1°C (stream saturation)
. R22 plate evaporators ð -1,7°C
TASPn ó Suction temperature for circuit n (°C)
Action
F Immediate halt of circuit n.
F The fault is displayed on the screen.
F The remote fault report is delayed for 6 minutes.
Resetting
Cas ¶ : For the first fault, resetting is automatic after of 30 minutes, if the evaporation temperature has
returned to over +1°C.
After this, circuit n can only be restarted after manual resetting
Cas · : For the first fault, the resetting is automatic after 30 minutes, if the evaporation temperature has
returned to over TBPI+3°C.
After this, circuit n can only be restarted after manual resetting.
Note : “Freeze” failure counters TOGELn are all reset to zero daily at 6 pm, on condition that the maximum
number of authorised faults has not been reached.
Trouble-shooting Solution
Incorrect TBPI instruction settings.
Evaporation, suction or chilled water output sensor
fault.
Wiring fault or disconnection of the sensor.
Water flow in the evaporator insufficient.
Check instruction settings.
Replace the sensor.
Check sensor connection.
Check flow and setting of flow controller.
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