Question about Paragon 8145-20 Defrost Timer

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I have a bad Paragon 8145-20 its Sunday all I have in stock is a Paragon 8045-20. I know voltage is the same. Will the 8045-20 work? What is the difference betweentime out and temperature out. If the 8045-20 will work I am sure it will be wired differently I will need wiring diagrams. Thanks Ray

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See wiring diagrams and manuals at following link:

8145-20 is 240V time initiated, pressure or temperature terminated with back-up time termination.
8045-20 is 240V time initiated, time terminated.

So 8145-20 has pressure or temperature limit switch that connects to terminal X that turns timer off, and ends defrost cycle. This timer is for hot gas defroster that has pressure/temperature limits. Check and see what the back-up time termination is set at on 8145-20. Look at small inner dial.

The 8045-20 timer does not use pressure/temperature limit switch, and instead you have to estimate length of time you want defrost cycle to run, and set inner dial to that time. Use same time as back-up time termination on 8145-20. Of course the pressure/temperature limits would not be exact and defrost cycle might not work correctly.

Here's the change-over wiring from 8145-20 to 8045-20.
There are other wiring variants depending on equipment.
240V hot wires from breaker box are L1 and L2
a) 8145-20 L1 is at terminal 1 > move L1 to terminal N on 8045-20
8145-20 L2 is at terminal N > move L2 to terminal X on 8045-20

b) 8145-20 hot gas defroster is at NO terminal 3 > move defroster to NO terminal 3 on 8045-20
Complete the 240 circuit to defroster by connecting to L2 at terminal X

c) 8145-20 refrigeration is at NC terminal 4 > move refrigeration to NC terminal 4 on 8045-20
Complete the 240 circuit to refrigeration by connecting to L2 at terminal X

Posted on Feb 06, 2011


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You may want to post your question to a paid answerer who specializes in refrigeration:

This being said:
The 8045 is for 'Electric Heat Defrosting'
The 8145 is for 'Hot Gas Defrosting'

I posted the manual:

I also posted the 8145 and 8045 wiring side by side:

The wiring changeover looks like the following:
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