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Delfield defrost controls
Delfield defrost controls and parts
Delfield defrost controls are primarily mechanical timers or electronic controls that automatically manage defrost cycles to prevent excessive frost buildup on freezer and cooler coils. Mechanical timers, often found on older models, use adjustable pins to set defrost frequency and duration. Electronic controls on newer models use sensors and digital displays to manage defrost cycles based on compressor runtime or evaporator temperature, and some also offer manual defrost options by unplugging the unit.
Types of controls
- Digital Controls (e.g., ERC112): These use a digital display and icons to show the unit's status.
- Cooler Defrost: Starts after a certain amount of compressor run time and stops when the coil reaches 41°
- Freezer Defrost: Starts after a specific compressor run time and stops when the coil reaches 55°
- A "deF" icon and a melting snowflake indicate a defrost cycle is in progress.
- After defrost, a drip time occurs before the unit returns to normal cooling mode.
- Manual Defrost: Can be initiated by pressing and holding the melting snowflake button.
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Key components
- Defrost Timer/Controller: The main component that manages the timing and execution of the defrost cycle.
- Defrost Heater: A heating element that warms the evaporator coil to melt frost.
- Evaporator Fan: Stops during the defrost cycle to allow the heater to work effectively.
- Compressor: Also shuts off during the defrost cycle.
- Sensors: On electronic models, sensors measure temperature to help determine when a defrost cycle is needed or to terminate
- Manual Defrost:
- For some electronic units, you can initiate a manual defrost cycle by simply unplugging the unit for a few seconds. The control will then re-initialize and start a defrost cycle before resuming normal operation