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:
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost

Posted on Nov 26, 2012

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1 Answer

How to set the timer of timing moter 8145-20


Copy following links:
http://waterheatertimer.org/Paragon-timers-and-manuals.html#set
http://waterheatertimer.org/images/8145-work-image.jpg

Install defrost trippers on dial at times you want defrost to begin.
8145-20 is generally time initiated, and temperature or pressure terminated... but you can set the defrost duration on smaller center dial..and this setting will terminated defrost cycle mechanically if the pressure or temperature sensor fail. Then manually rotate timer dial until current time lines up with time marker in upper left side.

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Copy following link to identify defrost timer.
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost
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Jun 11, 2013 | Paragon 8145-20 Defrost Timer

1 Answer

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:
http://waterheatertimer.org/images/8145-work-image.jpg
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost

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.
http://waterheatertimer.org/images/8145-20-wiring-600.jpg

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.

Dec 27, 2012 | Paragon 8145-20 Defrost Timer

1 Answer

How to set the defrost duration on a timer


Copy following link for defrost timers:
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost

There are 2 general types defrost timers.
Time activated - Time terminated
Time activated - Temperature-pressure terminated, with timed termination back-up

Here is basic image:
http://waterheatertimer.org/images/8145-work-image.jpg
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.
If timer is temperature-pressure terminated, then different wiring diagram is used.

Nov 11, 2012 | Paragon 8145-20 Defrost Timer

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How to wire a paragon defrost timer with liquid line solenoid valve t-stat electric heater for walk in freezer


page 20 in the heatcraft refrigeration manual shows how to interface a paragon defrost timer with the t-stat and evaporator coil.

Oct 21, 2012 | Paragon 8145-20 Defrost Timer

1 Answer

I'm looking for a control wiring diagram for this set up; The condenser is on the roof with a paragon 8145-20 in it. I want to control the defrost cycle of the walk in freezer that is downstairs. The...


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.
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

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