Electrolux R600a User manual

SERVICE MANUAL
REFRIGERATION
© ELECTROLUX ZANUSSI S.p.A. Publication No.
VIA GIARDINI CATTANEO, 3 599 34 74-40
I - 33170 PORDENONE (ITALY) 010601
Fax [phone] ITZ/SERVICE/AA
R600a
NOFROST
REFRIGERATORS

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CONTENTS
1. INTRODUCTION.................................................................................................................................................. 5
2. REFRIGERATION CIRCUIT................................................................................................................................ 7
3. ELECTRICAL WIRING........................................................................................................................................ 8
4. FUNCTIONAL DIAGRAM ................................................................................................................................... 9
5. OPERATION...................................................................................................................................................... 10
5.1 NORMAL ...................................................................................................................................................... 10
5.2 DEFROSTING .............................................................................................................................................. 11
6. COMPONENTS ................................................................................................................................................. 12
6.1 CONTROL PANEL : ..................................................................................................................................... 12
6.2 REFRIGERATOR COMPARTMENT :.......................................................................................................... 12
6.3 FREEZER COMPARTMENT : ..................................................................................................................... 13
6.4 COMPRESSOR COMPARTMENT : ............................................................................................................ 14
7. ACCESSIBILITY................................................................................................................................................ 16
7.1. CONTROL PANEL ACCESSIBILITY .......................................................................................................... 16
7.2. REFRIGERATOR COMPARTMENT ACCESSIBILITY............................................................................... 17
7.3. FREEZER COMPARTMENT ACCESSIBILITY ..........................................................................................18
8. TROUBLESHOOTING ...................................................................................................................................... 21

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1. INTRODUCTION
This manual describes NOFROST models loaded with R600a refrigerating gas.
There are three basic models and the only difference between them is volume:
260 litres (ex C9, pnc 925886…), 262 litres (ex C10, pnc 925887…) and 290 litres (ex C11, pnc 925888…).
The NOFROST refrigerators consist of a refrigerator compartment A and a freezer compartment B.
The cold produced by the battery-driven evaporator in the freezer compartment is then distributed through the
refrigerator and freezer compartment by the fan located above the battery.

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REFRIGERATOR COMPARTMENT (A)
The air is pushed by the fan down the foam duct at the bottom of the compartment: it enters by nozzle 1and
comes out of nozzle 2. Manual flap Cenables to regulate the flow of cold air and therefore the temperature
inside the compartment.
The thermostat bulb is located inside the flap and reacts both to the air temperature of the air coming out of
nozzle 2, and to the air temperature inside the refrigerator compartment.
The air returns to the air compartment through the foam duct at the bottom of the compartment, entering from
nozzle 3and leaving from nozzle 4.
FREEZER COMPARTMENT (B)
The cold air is pushed into the compartment by the fan through the two nozzles 5and 6. After circulating, the air
is rechannelled to the evaporator battery through opening 7, under the protection panel.

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2. REFRIGERATION CIRCUIT
Legend:
1. compressor
1. capacitor
2. filter
3. capillary
4. heat exchanger
5. battery evaporator

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3. ELECTRIC WIRING
( check the specific diagram for each model ! )
Legend:
1. 3 ways junction box a. yellow-green
3. freezer compressor junction box b. brown
5. overload cut-out c. blue
6. refrigerator thermostat d. white
9. stylus defrosting heater e. black
9a. armored defrosting heater f. grey
13. refrigerator lamp
15. light switch
24. battery fan
25. timer
26. safety thermal switch (+ 40 °C)
27. defrosting cut-out switch (+ 10 °C)
28. running capacitor

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4. FUNCTIONAL DIAGRAM
( check the specific diagram for each model ! )
Legend:
6. 3 ways junction box
3. freezer compressor junction box
5. overload cut-out
6. refrigeraotr thermostat
9. stylus defrosting heater
9a. armored defrosting heater
13. refrigeraotr lamp
15. light switch
24. battery fan
25. timer
26. safety thermic switch (+ 40 °C)
27. defrosting cut-out switch (+ 10 °C)
28. running capacitor

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5. OPERATION
5.1 NORMAL
In NOFROST refrigerators, the humidity inside the compartments (freezer or refrigerator) accumulates on
evaporator battery thanks to the air circulation, avoiding the formation of frost on food.
During normal operation the cam of the timer closes contacts 3-4 thus powering the compressor and fan circuits.
The operating time lasts about 14 hours.
The arrows in the picture show the current path.

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5.2 DEFROSTING
The ice on the battery must be removed regularly, therefore after about 14 hours of operating, the timer (25)
switches from contac 3-4 to contact 3-2, disconnecting the compressor and the fan and switching on the stylus
defrosting heater (9) and armored (9a).
For safety reasons and rules in the evaporator battery there are two defrosting heaters that are simultaneously
powered, since they are connected in parallel.
After 36 minutes defrosting, the timer switches to contact 3-4 again, switching on the compressor and the fan
and disconnecting the heating elements.
If the battery temperature reaches +10°C in less than 36 minutes, the heaters are switched off by the defrosting
cut-out switch (26). If, for any reason, it does not switch on and the battery temperature reaches +40°C , the
heating elements will be switched off by the safety thermal switch (27).
The arrows in the picture show the current path.

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6. COMPONENTS
6.1 CONTROL PANEL :
- pilot lamp B.
- thermostat knob T.
- light button P.
REFRIGERATOR COMPARTMENT:
- flap C: it enables to regulate the flow of air
coming from the freezer compartment through th
the knob M.
- lampholder A.

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6.3 FREEZER COMPARTMENT:
- fan D;
- couple of thermal overload cut-outs E
- evaporator battery F
- stylus defrosting heater G (117 W – 494 Ω)
- armored defrosting heater G1 (118 W – 482 Ω)
OPERATING TEMPERATURE
TYPE OF THERMAL
OVERLOAD CUT-OUT OPENING CLOSURE
DEFROSTING + 10 °C - 1 °C
SAFETY + 40 °C + 30 °C

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6.4 COMPRESSOR COMPARTMENT:
At the back of the appliance there is the timer H;
by using a screwdriver it is possible to rotate the shaft
cam manually, only clockwise, to switch the 3-4 and
3-2 contacts switch.
TIME “A” TIME “B”
14 h 26 ‘ 36 ‘

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By rotating the timer shaft clockwise with a screwdriver, you can hear two snaps that indicate the contacts
closure. As you can see in the picture (the position of the snaps is merely indicative), between the 1st snap and
the 2nd snap the run is minimum, between the 2nd and the 1st snap the run is longer:
Warning :
-In order to test the appliance during “normal” operation, you need to rotate the timer cam till the 2nd snap so
as to close 3-4 contact;
-In order to test the appliance during “defrosting” operation, you need to rotate the timer cam till 1st snap so
as to close 3-2 contact.

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7. ACCESSIBILITY
7.1. CONTROL PANEL ACCESSIBILITY
To access the components of the control panel (thermostat, pilot lamp and light button) carry out the following
operations:
1- remove the 2 fixing screws from the hinges;
2- remove the 2 fixing screws placed behind the appliance;
3- push forward the top.

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7.2. REFRIGERATOR COMPARTMENT ACCESSIBILITY
To access the flap:
- remove the caps that cover the two screws;
- loosen the two screws;
The thermostat bulb is inserted into the rear of the
flap (see detail).

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7.3. FREEZER COMPARTMENT ACCESSIBILITY
To access the components of the freezer compartment
it is necessary to remove I protection.
Evaporator battery
Fevaporator battery is fixed to container Kby two
lateral clips L and by three hooks at the bottom N,
removable with a screwdriver.

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Thermal overload cut-outs
The two +10°C and +40°C thermal overload cut-
outs are connected together in one component E
and therefore are not available as single spare part.
They are fixed to the conveyor Kwith two screws.
Once the battery is unhooked, it can be folded, as
pictured, to access the heating elements, paying
attention to the pipes.
Stylus defrosting heater
The stylus defrosting heater Gis fitted to the
battery by three clamps J; to replace it, remove the
clamps with a pliers (it is not necessary to cut them
because they can be used again).

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Armored defrosting heater
The armored defrosting heater G1 is
inserted into the aluminium wings of the battery;
to replace the heater, it is necessary to remove it from the
wings of the battery paying attention not to bend them.
The conveyor
The conveyor Kfor the defrosting water is fitted to the
bottom of the compartment with two clips L;
to unhook the conveyor it is necessary to push down
the two clips.
The fan
The fan is fixed with two screws.