Freezer Common Parts Glossary

Compressor

The compressor is a pump rotated by an electric motor. When the compressor receives low-pressure refrigerant gas from the evaporator, it rotates to compress the refrigerant to form a hot, high-pressure gas that moves through the condenser.

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Battery

The battery provides back-up power to the freezer control panel/display panel in the event of a power outage.

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Compressor motor kit

The compressor motor kit includes the compressor pump and compressor motor. It also includes the motor mount rubber grommets, the start relay, the overload device, the UV dye drier and copper tubing. It's used to replace the compressor motor.

Compressor start relay

The compressor start relay manages the start-up of the compressor and keeps the compressor running until the compressor cycles off.

Condenser

The condenser contains heat-exchanging coils that cool down the hot refrigerant leaving the compressor.

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Condenser fan

The condenser fan is in the machine compartment of the freezer next to the compressor. It moves air across the condenser coils to help cool the hot refrigerant coming out of the compressor. The refrigerant is cooled before it moves through the expansion device and into the evaporator.

Control panel

The control panel houses the selection buttons and the display for the freezer. The control panel connects to the electronic control board through a wire cable that communicates button presses and display functions.

Defrost drain tube

As part of the defrost cycle, the defrost drain tube transfers water that condenses in the evaporator drip tray under the evaporator to the drip pan near the compressor, where the water evaporates.

Defrost heater

This heating element is mounted on the evaporator. When the electronic control board activates the automatic defrost system, this heater melts the frost and ice off the evaporator fins to increase the heat-exchange efficiency during the normal cooling process.

Defrost sensor

The defrost sensor—also known as the defrost bi-metal thermostat—shuts off the freezer defrost heater if the heater gets hot enough to damage the evaporator.

Defrost timer

The defrost timer controls the intervals between automatic defrost cycles in the freezer. When the timer activates the defrost cycle, the compressor stops, and the defrost heater turns on briefly to melt frost from the evaporator fins to increase the heat-exchange efficiency. After the fins are defrosted, the timer reactivates normal cooling in the freezer.

Door switch

The door switch turns the freezer light on and off and monitors door position. Replace the door switch if it doesn't work.

Drain pan

The drain pan collects condensate water from the defrost cycle. It's located in the machine compartment of the freezer, next to the compressor. The defrost system melts frost and ice from the evaporator fins about every 8 hours to increase the efficiency of the evaporator heat exchanger. The condensate water that drips from the evaporator during that process collects in the evaporator drip tray and then is routed to the drain pan through a drain tube. The drain pan collects the condensate, which evaporates before the next defrost cycle begins.

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Electronic control board

The freezer electronic control board controls the major electro-mechanical components in the freezer. When the electronic control board senses the compressor needs to run to cool the freezer, it sends voltage to the compressor and fans. It then receives input from temperature sensors to monitor the temperatures inside the freezer. With this information, the electronic control board controls the defrost cycle.

Electronic control panel

The freezer electronic control panel houses the selection buttons and display for the freezer and allows you to monitor and control the operations of the freezer.

Evaporator

The evaporator is the heat exchanger that cools air inside the freezer to freeze the food. Refrigerant inside the evaporator cools the evaporator fins. The evaporator fan blows air across the fins to circulate the freezing-cold air through the cabinet.

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Evaporator drip tray

The evaporator drip tray is a metal collection pan under the freezer evaporator. Sometimes referred to as an evaporator drip pan, it collects water that drips from the evaporator fins during the defrost cycle. The collected condensate water drains from the evaporator drip tray through a drip tube to a drain pan at the bottom of the freezer in the machine compartment next to the compressor. The heat and air flow evaporates the condensate from the drain pan before the next defrost cycle begins.

Evaporator fan

The evaporator fan is mounted on the evaporator assembly. It moves air across the evaporator fins and through the freezer cabinet for cooling.

LED light board

The LED light board houses the LED light bulb(s). The electronic circuit board on the LED light board controls voltage going to the LED light bulb(s).

Lid gasket

The lid gasket is a flexible seal that attaches to the outer edge of the freezer lid to form an air tight seal around the lid opening when the lid is closed. The lid gasket prevents warm, moist air from leaking into the freezer compartment.

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Overload/PTC relay

The overload/PTC relay starts the compressor motor. It has 2 components: an overload protector that trips when the compressor motor overheats or locks up, and a relay. The relay manages the start-up of the compressor and keeps the compressor running until the compressor cycles off.

Temperature control thermostat

The temperature control thermostat is mounted in the control housing area and controls the temperature inside the freezer. It turns the compressor on and off as needed to maintain the set temperature in the freezer. The thermostat has a temperature sensor tube that detects the actual temperature in the freezer compartment and controls the temperature based on the reading from that sensor.

Thermistor

The thermistor is a temperature sensor within the freezer that sends information to the electronic control board.

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Wiring harness

The wire harness is a collection of wires, cut to specific lengths, that connects the various components in the freezer. The ends of the wires normally have the proper connection plugs or spades so that they attach correctly to the original components in the freezer.