How to set the defrost time for Paragon 8145-20 D-Frost-O-Matic Time control?

http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost
Link has infromation about paragon 8145-20 240 volt timer
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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

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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.

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

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Abrir enlace en internet:
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost

is it a Refr. or a Freezer for mthe freezer you can use a paragon model 8141-00-oem D-frost-o-matic timer control................good luck

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

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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.

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.