The Refrigeration Cycle - Cornelius COR5014UBCSD Service Manual

COR5014UBCSD Service Manual
Condenser fan motor:
The condenser fan motor is located underneath the cooling cabinet. It is a ventilation device which forces
the ambient air to flow over the condenser in order to cool down the refrigerant flowing inside it. The fan
motor works only if the compressor is on.
Evaporator:
The evaporator is located inside the cooling cabinet. As the gas flows at a low pressure through the
evaporator, it absorbs heat through the copper coil from inside the cabinet.
Evaporator fan motor:
This device provides the required circulation of air through the cooling cabinet as well as over the surface
of the evaporator's serpentine thermal exchange area. This fan motor runs continuously.
The evaporator and condenser serpentines have aluminum fins that help increase the surfaces for the
thermal exchange in an efficient way.
Capillary tube:
It consists of several feet of tubing having a small inside diameter. It is a device used to control the
amount of refrigerant that flows into the evaporator.
Drier:
The drier is located in between the condenser and the evaporator. It traps and removes moisture in the
refrigeration system while allowing oil and refrigerant to flow freely.
Accumulator:
The accumulator is located in between the evaporator and the compressor. It is a storage tank which
receives refrigerant liquid from the evaporator and prevents it from flowing into the compressor.
Temperature control:
The adjustable temperature control is responsible for detecting temperature changes inside the cooling
cabinet. It also starts the compressor motor whenever the cabinet rises above the desired temperature.
The temperature control consists of a switch which is mechanically activated by a diaphragm. This
diaphragm is connected to a thermo-sensible bulb (located inside the cabinet) through a small diameter
tube. All three components (the diaphragm, the thermo-sensible bulb, and the small diameter tube) are
filled with refrigerant gas which reacts to temperature changes.
When the cabinet temperature rises, the refrigerant in the bulb heats up and expands, expanding the
diaphragm. The diaphragm's expanding closes the temperature control's interrupting device and then
starts the compressor and condenser motors.
The drop in temperature inside the cooling compartment is caused by the refrigerant's continuous
circulation through the system. When the temperature drops, the refrigerant inside the temperature
control's bulb contracts, allowing the diaphragm to open the interrupting device, which consequently
shuts down the compressor and condenser motors.
Cooling cabinet:
This is the area where the goods are stored. It has been designed to allow for constant cold air circulation
to flow through the goods.
T R
HE EFRIGERATION
1. Depending on the increase in temperature inside the cooling compartment, the refrigerant gas
inside the temperature control's bulb heats up and expands, expanding the diaphragm. The
diaphragm's expansion closes the temperature control's interrupting device.
2. The temperature control's interrupting device turns on the compressor and condenser motors.
3. The compressor recirculates the refrigerant throughout the system by drawing the refrigerant gas
as low vapor pressure from the evaporator. Then it compresses the refrigerant and forces it into the
condenser.
Publication Number: 630460277SER
C
YCLE
- 2 - © 2004, IMI Cornelius Inc.