Merloni Elettrodomestici
55 CM WIDE BUILT-IN FRIDGE-FREEZERS
Technical Manual
I
04-10-22/01
12-33
Language
Issue/Edition
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5. Defrost elements (No-Frost only)
INFORMATION:
How It Works
: the two elements (evaporator
72 W
and
650 Ohm
and drip tray
15 W
and
3200 Ohm
) are both activated solely during the defrosting phase, which is ended
based on temperature or time.
In any case, the power supply of the 72 W resistor is cut off if the probe measures a
temperature of approxi8 °C.
The time lapse between one defrosting cycle and another varies between a maximum of
30 hours to a minimum of 6 hours, and is determined by the electronic board in accord-
ance with the table below, based on the time taken by the Freezer probe to reach +8 °C.
POSSIBLE CAUSE OF MALFUNCTION:
Microcontroller management
Resistor driver circuit on the board
Connection on the board
Wiring
Connection on the elements
Elements
Blown thermo fuse
TESTING:
General on the appliance
: Carry out the check using the Autotest procedure.
Wiring:
check for continuity and short circuits; check the connections (connectors and
terminals); check for presence of voltage. check that the thermo fuse is not open.
Component
: check with simulated load (lamp); direct check of the elements (powered
directly).
Board
: visual check and quick check of the board (blowouts or burnouts, etc.); check by
using a replacement.
Time to reach +8 °C
Defrost cycle interval
Warnings:
• When a fast freeze cycle is selected,
defrosting is carried out after
14 hours.
• In the event of a power failure, the
freezer is automatically defrosted
following the first compressor
cycle.
16 minutes
30 hours
16/20 minutes
27 hours
20/24 minutes
26 hours
24/28 minutes
23 hours
28/32 minutes
21 hours
32/36 minutes
17 hours
36/40 minutes
13 hours
40 minutes
6 hours
