SOURCE: how to wire the paragon defrost time with the
Your refrigeration circuit should be connected to terminal # 4, as this is the normally closed set of contacts, and the heaters should be powered from terminal # 3 as this is the normally open set of contacts. Hope this helps.
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)
SOURCE: I have installed 3 paragon
You need someone to come in and trace the wiring if you cannot figure it out. You said you had the Paragon wiring diagram already, if not the link below can be used.
http://www.uni-line.com/images/docs/refrigeration-8140series-wiring.jpg
This defrost time can be used for both hot gas and electric heater defrosting so check to see which defrost type is being used.
SOURCE: I have a paragon 8145-20 defrost timer. do you
Link below has wiring diagrams and wiring manuals for 240V 8145-20
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost
I am not expert installing defrost timers.
According to information from Paragon, 8145 is for hot gas defrosting. 8140 series are time initiated, and pressure-or-temperature terminated.
Wiring diagram does not show compressor wired to timer.
The cycle works like this:
Timer is running but defrost is not switched ON.
Fan is ON.
Timer switches ON and activates defrost cycle.
Fan turns OFF. Hot gas valve turns ON for defrosting.
Cycle limit switch is temperature or pressure sensitive.
Cycle limit switch reaches trip point, timer switches OFF.
Hot gas valve turns OFF. Fan turns ON.
So fan is off during defrost cycle.
Hot gas valve turns ON when timer switches ON.
Timer is switched OFF by pressure-or-temperature limit switch.
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