Basic Components - Frigidaire LGUB2642LF2 Service Manual

Sealed System

Basic Components

The basic components of a refrigerator are a compressor, condenser, evaporator, heat exchanger (capillary tube and
suction line), drier and perimeter hot tube.
Perimeter Hot Tube
To reduce the possibility of condensation forming on the exterior of the cabinet in high humidity areas, a perimeter
hot tube (refrigerant tube) has been installed in the unit. The perimeter tube extends up the left side, across the top
of the freezer and down the right side into the filter drier. When the compressor operates, warm refrigerant flows
through the primary condenser, then into the primary hot tube, warming the cabinet front exterior.
The perimeter hot tube is not replaceable. In the unlikely event of a leak in the hot tube, a kit is available to bypass
the hot tube in the sealed system. An electrical heater wire must be installed within the tubing. The electrical
connection for the electrical heater wire for a solid state PTC relay compressor is be connected into the condenser
fan circuit. For a variable speed compressor, the electrical connection must be made to the 115V inverter board.
Refer to the appropriate parts list of the model being serviced for the correct kit part number.
Refrigerant Cycle
The refrigerant cycle is a continuous cycle that occurs whenever the compressor is in operation. Liquid refrigerant
is evaporated in the evaporator by the heat that enters the cabinet through the insulated walls, and by the heat from
product load and door openings. The refrigerant vapor is then drawn from the evaporator, through the suction line,
to the compressor.
Compression raises the pressure and temperature of the vapor in the compressor and the vapor is then forced
through the discharge valve into the discharge line and into the condenser. Air passing over the condenser surface
removes heat from the high pressure vapor which then condenses to a liquid. The liquid refrigerant then flows from
the condenser to the evaporator through the small diameter liquid line (capillary tube).
Before it enters the evaporator, the liquid refrigerant is sub-cooled in the heat exchanger by the low temperature
suction vapor in the suction line. When refrigerant is added, the frost pattern will improve, the suction and discharge
pressures will rise, the condenser will become hot and the wattage will increase.
EEV
Valve
Hot
Cap Tube
Tube
Ice Maker
Evaporator
Filter Drie r
Condenser
System Drawing Finger Refrigerated Food
Compartment Ice Maker
Accumulator
Evaporator
Ice Maker
Freezer
Evaporator
Cap Tube
Freezer
Evaporator
Compressor
Figure 7-3 . Automatic Defrost Models
Hot
Cap Tube
Tube
Ice Maker
Evaporator
Filter Drie r
Condenser
System Drawing Flex Tray Food
Compartment Ice Maker
7-6
Suction Line From Ice
Maker Evaporator To
Inlet Of Freezer Evaporator
Evaporator
Ice Maker
Freezer
Evaporator
Compressor