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FRIULINOX ALI GROUPS.R.L. A SOCIO UNICO
78
Via Treviso,4 - 33083 Taiedo di Chions (PN) -Italy
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9.2.6.
Ice formation on evaporator
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The formation of ice on the evaporator may depend on:
- incorrect set of the parameters that manage the defrost
-
malfunction of the “E2” defrost heater
-
malfunction of the condensate drain heater and “E8” tray heater
-
incorrect reading of the “NTC probe defrosting” evaporator probe which compromises the
correct defrosting end temperature
–
d2 parameter
- malfunction of the evaporator fans
- air infiltration from the evaporator protective casing
- intensive use of the equipment / frequent door openings
- incorrect use by the Customer
1. Check the parameters that manage defrosting: d0, d1, d2,d3,d7 and d8
see relative paragraphs
2. Start a defrosting cycle and make sure that the “E2” defrosting heater, the condensate
drain heater and the “E8” evaporator tray heater (models with range
-25/
-15°C; -22/-18°C; -20/-15°C; -6/+4°C; -2/+8°C) work correctly
The condensate drain heater and the “E8” evaporator tray heater are a single piece
The failed operation of the “E8” heater can cause the water and ice to overflow inside the cabinet
If there is voltage, check the absorption (A) of heater “E2” and of heater “E8”
Replace the heater that has no absorption
see relative paragraphs
Attention: the defrosting heater is connected in series to the “B2” clixon
If the clixon contact is open (NO), it cuts the power supply to the heater
Once the heater is disconnected from the connector board, using the
multimeter set in Ω, check whether the clixon contact is open or closed
If the clixon contact is open even at room temperature
replace the heater
3. Check that the reading of the "NTC probe defrosting" evaporator probe is correct
An abnormal temperature reading may compromise the effectiveness of the defrosting