Question about Paragon 8145-20 Defrost Timer

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Set defrost timer on Paragon Electric Defrost-O-Matic

Model 8045-20--What is a reasonable defrost duration for this unit attached to a small walk-in freezer (6 feet wide, 5 ft deep, 7 ft high). I had it set to 30 minutes every 2 hours, but it does not defrost completely to the top of the cooling fins. Thanks.

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The problem is not necessarily with the timer. it seems you have more than ample time and time allocations to perform a complete defrost. most walk ins should have roughly 25-40 minutes of defrost every 4 to 8 hours. if you defrost with a heating element, you may have a problem with the strength of the element,or the element may be pulled away from the coil. you could also have a problem with the defrost thermostat(allowing the defrost to terminate prematurely)

Posted on Jun 17, 2009

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If the air flow and temperature are not being compromised leave it alone. If there is a gradual build up of ice on the evaporator you may have a defrost element or defrost limit switch problem. Set the defrost duration duration to 45 minutes and see if that solves the icing problem. 4 defrost cycles a day should be enough to keep the icing problem at bay. 3 defrost cycles at night about 1 hour apart may also remedy the problem. Experiment until you find the right combination of defrost cycles for your freezer. Watch for any thawing of the product in the freezer and adjust accordingly.
Bills Refrigeration/Montana.

Posted on Dec 12, 2008

  • mariscostamp
    mariscostamp Nov 11, 2012

    How can a moved the cooper pointer for longer heater time?


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Copy following link for paragon defrost timer manuals:

Posted on Nov 26, 2012

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I have a Paragon 8145-20 D-Frost-O Matic installed in on my walk-in freezer. The ice is accumulated on the fins of the freezer. Now it run for 11 minutes then stop for 3.5 minutes. I think the stop time...

1) Copy following links:

2) Typically the 8145-20 defrost cycle is time-initiated and starts when tripper pin located on outer part of dial passes the time-of-day point.
Defrost cycle terminates or ends when pressure or temperature switch activates. This is also called the cycle limit switch.

3) So your situation sounds like the pressure or temperature switch is not working correctly.

4) The 8145 timer also has 'time termination' setting. This red tripper is located on inner part of dial.
Usually the 'time termination' is used as back-up system if the pressure or temperature switch fails so that defrost cycle will not continue melting everything in freezer.

5) To solve problem until pressure-temperature switch is replaced, you can disconnect wire on terminal X, and then set 'time termination' for correct length of time by experimenting.

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Copy following link for defrost timers:

There are 2 general types defrost timers.
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Here is basic image:
Rotate dial until current time lines up with pointer, insert tripper pin on outside edge of dial to select defrost start-time, move defrost duration tripper on inner dial to set termination time.

Each defrost timer is slightly different:
If timer is time-terminated, then wiring follows certain diagram.
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Hi and welcome to FixYa, I am Kelly.
Actually... You may have bought the incorrect part to repair your refrigerator. The symptom your describing is most often caused by the defrost heater element itself being open. (<-Burned out) The reason I say this is your unit is shutting off.... starting the defrost cycle... but NOT terminating the cycle until the compartment reaches 60 deg F. The fact that it restarts at 60 Deg F is telling you the defrost timer control AND the defrost bi-metal 60 deg F thermostat are both working normally. I would bet if you removed the evaporator coil access panel in the back of the freezer compartment that you would immediately notice the heating element in the glass tube UNDER the evaporator coils has failed or... one of the wires on the end of the heater has failed. It is not difficult to gain access to the evaporator coils. You remove all racks in the freezer compartment and ALL of the screws including the one usually under the light cover and the panel is pulled toward you from the TOP. To remove the light cover there are 2 tabs on one side of the plastic cover that you gently squeeze the cover to release it. The problem can be the defrost timer but... as you described the symptoms; I seriously doubt it.
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Open following link to see wiring diagram and manual for Paragon defrost timers:
8145-20 is 240V time-initiated, pressure or temperature terminated, with back-up time termination.

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I am not sure of your wiring but see no reason that you could not run straight from the breaker to the timer and the timer to the freezer. Determine how long you want the defrost time to be on each hour and set the pegs accordingly. This is if I understand or picture your timer correctly. You have a walk in Freezer, and a rather large box 110 volt timer,correct? The pins on the 24 hour timer wheel can be taken off or moved? If I am wrong, I am sorry. I have the wrong picture in mind. 

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