Dixie Narco DNCB 168, Руководство по обслуживанию и устранению неисправностей

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compressor housing from which it also takes heat before going back outside of the vender. The condenser fan
runs when the compressor motor runs.
FILTER/DRYER
The filter/dryer is in the liquid line between the condenser and the capillary tube. This dryer filters out any foreign
particulate matter and also contains a desiccant to absorb any moisture that may be present in the system.
CAPILLARY TUBE
The capillary tube (between the condenser and the evaporator in the refrigerant line) has a very small inside
diameter, and serves to control the refrigerant flow from the condenser into the evaporator.
EVAPORATOR
The evaporator (in the vender cabinet) takes heat from the air in the vender cabinet and gives this heat to the
liquid refrigerant. The liquid refrigerant is evaporated (boiled off) as a gas, and the gas is drawn out by the
compressor.
EVAPORATOR FAN
The evaporator fan draws warm air from around the cans or bottles in the cooling compartment and blows it
across the evaporator. As the air goes across the evaporator, it gives up heat to the evaporator, then goes back
to the cans or bottles, and takes heat from them. This fan runs continuously when the vender is plugged in.
CONDENSATE PAN
The condensate pan (located in the compressor compartment) collects the water which runs from the
evaporator. The water is evaporated into the surrounding air by means of soakers. The soakers extend down
into the pan to absorb the water. Exposure to the surrounding air evaporates the water in the soakers.
- ELECTRICAL PARTS -
TEMPERATURE CONTROL
The temperature control is the part that is made up of a control bulb connected by a small metal tube to a
bellows. The control bulb is in a slot in the evaporator fan housing. The bellows and a switch known as the
temperature control switch, are in the temperature control box which is fastened to the right side ins ide the
vender.
The control bulb and the bellows have a vapor in them. When the temperature of the vapor in the bulb rises, it
builds up pressure in the bellows tube. This pushes the bellows out. When the control bulb is cool, the vapor
shrinks back, and the bellows pulls in. These movements, of the bellows, work the switch - called the
temperature control switch - closing it when the bulb is heated and opening it when the bulb is cooled.
The contacts of the temperature control switch are in the compressor motor's running and starting circuits. They
are also in the condenser fan motor circuit.
When the cabinet temperature gets up to the cut-in setting, the temperature control switch closes in the
compressor motor's starting and running circuits and in the condenser fan circuit. When the cabinet temperature
gets down to the cut -out setting, the temperature control switch opens in these circuits.
CAUTION:
To adjust the temperature control see page 44.
THERMAL OVERLOAD ASSEMBLY
The thermal overload is a temperature activated switch that interrupts power to the compressor when excessive
temperatures occur. This switch protects the compressor from the damage that will occur if the compressor
continues to operate under adverse conditions. The overload also opens under abnormally high amp draws,
protecting the motor windings from damage. Frequent overload trips may lead to warm product and be the first
indication of a dirty condenser or other refrigeration related problems that require attention.
STARTING RELAY
The starting relay is a device that connects the start winding of the compressor during start up. The additional
winding (start) helps the compressor motor come up to speed. Once it reaches speed the starting relay
disconnects the start winding from the circuit.