Question about Paragon 8145-20 Defrost Timer

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How to set a 8145-20 defrost timer

I have a Larken walk-in freezer. I replaced a paragon 8145-20 defrost time with an identical new one. The condenser is not freezing up and the walk-in shoots up to 50 degrees for hours at a time.

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Posted on Jan 02, 2017

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SOURCE: Set defrost timer on Paragon Electric Defrost-O-Matic

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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SOURCE: install and use Paragon 8145 defrost timer

try the uniline website

Posted on Feb 26, 2010

SOURCE: I'm looking for a control

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.

Posted on Feb 11, 2011

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1 Answer

Wiring walk freezer


Copy following link to identify defrost timer.
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost
Add a comment and say which defrost timer you have, which voltage and phase the incoming line

Jun 11, 2013 | Paragon 8145-20 Defrost Timer

1 Answer

Looking for set of trippers for paragon 4014-20 pool timer


Copy following link to identify timer:
http://waterheatertimer.org/Paragon-timers-and-manuals.html#4000

Paragon 4000 series uses X2772 tripper
Paragon is no longer making timers except for defrost times.
There is a new line of timers coming from China that looks identical to Paragon 4000, and uses same tripper. As a result this timer design and trippers could be around for years to come.

Replacement timer is Intermatic T104R 240Volt indoor outdoor enclosure, with replacement parts widely available
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T104

Add a comment

Apr 03, 2013 | Paragon Amf 7008-00 Timer 7 Day 120 Volt...

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 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

Wiring a defrost timer to a heatcraft condensing unit


Which defrost timer do you have?
Do you have time or temperature termination?
What voltage are you working with?
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost

Aug 17, 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.

Feb 11, 2011 | Paragon 8145-20 Defrost Timer

1 Answer

Paragon 8145-20 defrost timer


I am not professional at commercial refrigeration, and can't answer your question directly.
However, you can see 8145-20 240V defrost timer wiring diagrams and manuals on following link.
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost

8145 timer is time initiated, and pressure/temperature terminated, with back-up time termination.

Jun 28, 2009 | Paragon 8145-20 Defrost Timer

1 Answer

MY 8145-20 DEFROST TIMER WILL NOT ADVANCE,


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. 

Feb 16, 2009 | Paragon 8145-20 Defrost Timer

3 Answers

Set defrost timer on Paragon Electric Defrost-O-Matic


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.

Nov 14, 2008 | Paragon 8145-20 Defrost Timer

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