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1.3.2 ELECTRICAL DEVICES
The below-described devices belong to three different categories:
- Control devices
- Actuators
- Signalling devices
- Devices that allow the user to control a parameter or to activate a device belong to the
first category.
- Devices receiving the electric signal from control devices and allowing the enabling /
disabling of actuators belong to the second category.
- The signalling devices inform the user of the state of the appliance.
Control devices
- Main switch (IG) (31): enables all the devices, acting on the main relay (RG) (63).
- Light switch (IL) (32): enables the inner lights (L2) (34) and the display light (L1) (33).
- Inner tank thermostat (TC) (80): it allows the user to adjust the internal temperature of
the refrigerator for average values, starting and stopping periodically the compressor; acts
directly on the cut off valve (VM) (84) solenoid coil (2).
- Defrosting timer (TS) (81): it activates, at fixed intervals of 6 hours, the defrosting function
for a period of 22.5 minutes; the user can operate it in order to have a defrosting cycle at a
preferred time during the day. The defrosting interval and its length are predefined and cannot
be modified by the user. It activates the defrosting relay (RS) (61) and the evaporator gutter
heater (RSG) 65); at the same time, it stops the internal fan (MI) (36).
Actuators
- Door switch (IP) (36): stops the internal motor fan (MI) (39) every time the door is opened.
It is located on the top-left of the door, on the display lamp metal support.
- Main relay (RG) (63): operated directly by the main switch (IG) (31), cuts off the voltage
supply to the freezer. It is located on a metal support, together with the cord strain relief (37),
in the compressor compartment.
- Compressor relay (RC) (62): operated by the low pressure pressostat (PBP) (88), allows
the starting/stopping of the compressor (CO) (12) and of the relative motor fan (MC) (38).
- Defrosting relay (RS) (61): activated by the defrosting timer (TS) (81), acts on the cut off
valve (VS) (84) solenoid coil (2); at the same time it activates the evaporator heater (REV)
(66).
- Low pressure pressostat (PBP) (88): acts directly on the compressor relay (RC) (62),
controlling the starting/stopping of compressor (CO) (12) and relative motor fan (MC) (38); it
stops the compressor when the evaporator pressure decreases below a fixed value.
- Compressor (CO) (12): it performs the function of rising the refrigerant pressure to allow
the change of state from gas to liquid.
- Condenser motor fan (MC) (38) and blade (41): it enables the change of refrigerant state
inside the condenser (14) and performs the refrigerant cooling function.
- Evaporator motor fan (MI) (39) and blade (40): it enables the air circulation inside the
tank and allows its cooling in the evaporator (20).
- Cut off valve (VM) (84) and solenoid coil (2): it performs the function of enabling/disabling
the refrigerant flow towards the evaporator.
ols panel (18)
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