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what is a defrost termination switch

by Gabe Collins Published 3 years ago Updated 2 years ago

What is a defrost termination switch? The function of this temperature-activated switch is to “terminate” defrost when the evaporator coil has been defrosted, and also to “delay” the evaporator fans from coming on immediately after defrost. Time clocks can be programmed for certain defrost duration periods.

The function of this temperature-activated switch is to terminate defrost when the evaporator coil has been defrosted, and to delay the evaporator fans from coming on immediately after defrost.Apr 7, 2009

Full Answer

Images of what is a defrost termination switchbing.com/images

A defrost termination thermostat is mounted onto the coil to detect when the coil is free of ice and will often be set to “terminate” or stop the defrost heat when the coil reaches around 55°F-60°F to ensure that the entire coil is ice-free.

What is a defrost termination thermostat?

The function of this temperature-activated switch is to “terminate” defrost when the evaporator coil has been defrosted, and also to “delay” the evaporator fans from coming on immediately after defrost. Time clocks can be programmed for certain defrost duration periods. This time duration is set at the time clock in minute increments.

What is the function of the temperature activated defrost switch?

It does this by solenoid action and levers, and mechanically closes the normally closed (NC) contacts and opens the NO contacts of the defrost time control. This action by the defrost termination solenoid (release solenoid) prevents the system from sitting idle for 30 minutes in defrost with the heaters off.

How does a defrost termination solenoid work?

If the system has an optional heater safety switch - or sometimes referred to as a defrost limit control - in series with the defrost heater, this limit switch will open and take the defrost heaters out of the active circuit. However, the system’s defrost timer will still have 30 minutes left in the defrost mode.

What is a defrost limit switch on a refrigerator?

Videos of What Is a Defrost Termination Switchbing.com/videos

Images of What Is A Defrost Termination Switchbing.com/images

How does a defrost terminator work?

0:552:56Defrost Thermostat - How to Test and How they Work - YouTubeYouTubeStart of suggested clipEnd of suggested clipThe contacts inside the defrost thermostat are going to open up so no more voltage can pass throughMoreThe contacts inside the defrost thermostat are going to open up so no more voltage can pass through the heater if that heater would stay on the entire time.

What is a defrost limit switch?

The defrost termination thermostat (aka defrost limit switch) is basically a small SPST (single pole) electrical switch which is actuated by temperature. Depending on the temperature it is, it will either have no resistance (show continuity) and be good or will have infinite resistance (no continuity) and be defective.

What is defrost termination fan delay?

0:303:54Online HVAC Training - YouTubeYouTubeStart of suggested clipEnd of suggested clipIt will terminate the defrost and and and kick it back into the freezer. And. The other thing thatMoreIt will terminate the defrost and and and kick it back into the freezer. And. The other thing that it does is once the coil gets defrosted it's rather warm. So it delays the fans coming back on until

How do you test a defrost termination thermostat?

1:394:44How To Test Your Defrost Thermostat & How They Work - YouTubeYouTubeStart of suggested clipEnd of suggested clipPlace one of each of the meters probes on each of the defrost thermostat wires while the thermostatMorePlace one of each of the meters probes on each of the defrost thermostat wires while the thermostat is colder than the closing temperature. The thermostat should have continuity.

How do I know if my refrigerator defrost is bad?

A defrost timer switches the refrigerator between the cooling and defrost mode. If it goes bad and stops at cooling mode, it causes excessive frost to build up on the evaporator coils which reduces the air flow. Or when it stops at the defrost mode it melts all the frost and does not go back to the cooling cycle.

What causes a refrigerator to not defrost?

One of the most common reasons your fridge may not be defrosting is a faulty timer. Issues with these parts are easy to diagnose, but the timer itself cannot easily be repaired. The best solution is to replace the timer.

How long should a defrost cycle last?

approximately 25 to 45 minutesDuring defrost there will be no running sounds, no fan noise and no compressor noise. Most models will defrost for approximately 25 to 45 minutes, usually once or twice a day. You may hear water dripping or sizzling as it hits the heater.

What happens to the evaporator fan motor when the defrost cycle is terminated?

What happens to the evaporator fan motor when the defrost cycle is terminated? The fan shuts off until the defrost termination thermostat senses that the evaporator is cold again.

How often should a commercial freezer defrost?

A commercial freezer should have up to three to four defrost cycles per day and should be set for specific times. It is imperative to ensure the defrost cycle kicks in when there's enough frost build-up, while the heaters should be able to defrost the coils within 15-20 minutes.

What happens when defrost thermostat fails?

The failed defrost thermostat will not accurately sense the temperature around the evaporator coils. So, even when the coils get far too cold while ice and frost continue to build up around them, the thermostat will fail to allow power to flow to the heater.

How do I know if my freezer thermostat is working?

0:062:05Fridge Warm? Defrost Thermostat Testing, Troubleshooting - YouTubeYouTubeStart of suggested clipEnd of suggested clipYou can easily test the part for continuity. By using a multimeter. There are a variety of meters toMoreYou can easily test the part for continuity. By using a multimeter. There are a variety of meters to choose from for this demonstration. We will use both analog and digital models.

How do you reset a thermostat on a refrigerator?

1:132:36Refrigerator Troubleshooting, Hard Reset, and Liquid Temperature ...YouTubeStart of suggested clipEnd of suggested clipIf the cause of your issue is still a mystery you'll want to try what is called a hard reset unplugMoreIf the cause of your issue is still a mystery you'll want to try what is called a hard reset unplug your unit from the wall for 30 to 45. Minutes then plug the unit back in this will reset the unit.

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