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The new evaporator batteries are not interchangeable with the old ones. The evaporator batteries for the R134a version feature only one defrosting heater, while the evaporator batteries for the R600a version feature two defrosting heaters connected in parallel for safety reasons of the product. The thermal protections are connected in series to the defrosting heaters and are cabled together, therefore, they are not interchangeable singularly.
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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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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 3 and leaving from nozzle 4.
3.2. R600a version ( check the specific diagram for each model ! ) Legend : terminal board of freezer compressor a. yellow-green motor protector b. brown thermostat refrigerator c. blue stylus defrosting heater d. white armoured defrosting heater e. black refrigerator lamp...
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.
5.2 DEFROSTING The ice on the battery must be removed regularly, therefore after about 14 hours of operating, the timer (25) switches from contact 3-4 to contact 3-2, disconnecting the compressor and the fan and switching on the stylus defrosting heater (9) and armoured (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.
6.1 CONTROL PANEL : - pilot lamp B. - thermostat knob T. - light button P. 6.2 REFRIGERATOR COMPARTMENT : - flap C: it enables to regulate the flow of air coming from the freezer compartment through the knob M.
6.3 FREEZER COMPARTMENT : - fan D; - thermal overload cut-outs E (for technical data see Tab. A); - evaporator battery F; - defrosting heater G (for technical data see Tab. B). Tab. A TYPE OF THERMAL OPERATING TEMPERATURE OVERLOAD CUT-OUT OPENING CLOSURE DEFROSTING...
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. VIEW OF THE TIMER CONTACTS ELECTRIC CIRCTUIT OF THE TIMER Contact 4 : compressor;...
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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 1 snap and the 2 snap the run is minimum, between the 2 and the 1 snap the run is longer:...
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: remove the 2 fixing screws from the hinges; remove the 2 fixing screws placed behind the appliance; push forward the top.
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). NOFROST REFRIGERATORS WITH EXTERNAL ELECTRIC WIRING 21/25...
7.3. FREEZER COMPARTMENT ACCESSIBILITY To access the components of the freezer compartment it is necessary to remove I protection. Evaporator battery F evaporator battery is fixed to container K by two lateral clips L and by three hooks at the bottom N, removable with a screwdriver.
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As the battery has been detached, it can be bent (see picture) to access the heaters paying attention to the pipes. Heaters and thermal cut-outs assembly The defrosting heaters are fitted to the wings and hooked to the battery by means of three clamps J; to replace them, unhook the clamps with a pliers (do not cut them because they can be used again) and remove the heaters from the wings paying...
8. TROUBLESHOOTING WARNING ! Unplug the appliance before operating. Discharged circuit: In case of refrigerating gas leak, the troubleshooting must be carried out not only in the traditional weldings, but also in the junctions with LOKRING ring of the pipes battery-capillary R and battery-return pipe S and in the weldings of cylinder T (for the R600a version).
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Failed defrosting: If no defrosting cycle occurs, the possible causes could be: Sequence CAUSE POSSIBLE CAUSES HOW TO VERIFY n° POSSIBILI One or both Freeze the battery, then unplug the If the value of the resistances does defrosting heaters appliance, disconnect the connectors not correspond to the technical are interrupted of the heaters and check with the...