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I've got a bigatti sb1 defrost timer with the wiring diagram missing,where can i get a copy from. thanks

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Posted on Apr 04, 2009

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Related Questions:

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Wiring walk freezer

Copy following link to identify defrost timer.
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

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How to set the defrost duration on a timer

Copy following link for defrost timers:

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:
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

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.

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.
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Feb 11, 2011 | Paragon 8145-20 Defrost Timer

1 Answer

I need a three phase wiring diagram for 8145-20 model timer.

8145-20 240Volt Paragon timer is not 3-phase.
Clock motor is 240V.
You need a transformer to convert 3-phase to single phase 240V to operate timer.
Then timer outputs can control 3-phase power using 3-phase contactors
Contactor below is 3 phase with 240V coil

Defrost timer wiring diagrams show below:

Dec 21, 2010 | Paragon 8145-20 Defrost Timer

1 Answer

Refrigeration ynit not going into defrost, I need a electrical wiring diagram to help me troubleshoot this one. Where can I get that?

See defrost timers and wiring diagrams and manuals

You posted under 8145-20

8145-20 is time initiated, temperature or pressure terminated.
Defrost timer training pdf

The 8145-20 timer:
Power leads connect to terminals 1 and N.
For 120Volt circuit: L is black hot wire to terminal 1, N is white neutral wire to terminal N
For 240Volt circuit: L1 and L2 are the hot leads from 240V breaker

'NO' means normally open, so terminal 3 turns ON only when timer turns on (that is 'time initiated')
So the hot gas valve for defrosting is connected to terminal 3 and turns ON when timer turns ON.
The other wire from hot gas valve connects to terminal N where it completes the circuit

'NC' means normally closed, so terminal 4 is ON at all times EXCEPT when timer turns ON.
That means fan is ON all the time, except when time initiated sequence begins, and then fan turns OFF while hot gas valve is defrosting unit.
The other wire from fan connects to terminal N where it completes the circuit

The cycle limit switch is connected to terminal X.
This is the switch that terminates the defrost sequence and turns timer OFF
Other wire from cycle limit switch connects to terminal N where it completes the circuit

I also suggest you ask a paid fixya experts who can provide additional information by phone.
Paid experts will not answer your question unless they know the answer, and if their answer is not complete, then fixya offers money back guarantee.

Dec 15, 2010 | Paragon 8145-20 Defrost Timer

1 Answer

I have a paragon 8145-20 defrost timer. do you wire the compressor to the timer? I cant seem to find a wiring diagram on how to wire this correctly

Link below has wiring diagrams and wiring manuals for 240V 8145-20

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.

Dec 09, 2010 | Paragon 8145-20 Defrost Timer

1 Answer

Trying to replace a 8045-20 w/ 8145-20 need wiring info

The 8045-20 & 8145 are 240V timers.
My maintenance buddy at McDonalds says the defrost timers are interchangeable, BUT I have not wired these particular timers.
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:
Hot1 on 8045 is connected to terminal N => move this wire to terminal 1 on 8145
There is a jumper plate on 8045 that connects terminals 1 N 2
Jumper plate on 8145 connects terminals 1 and 2
If jumper plate is missing on 8145, use jumper wire to connects terminals 1 and 2
Hot2 on 8045 is connected to terminal X => move this wire to terminal N on 8145
Other wires on 8045 that are connected to terminal X => move to terminal N on 8145
Thermostat on 8045 is connected to NC terminal 4 => move this wire to NC terminal 4 on 8145
Heater on 8045 is connected to NO terminal 3 => move this wire to NO terminal 3 on 8145
Terminal X on 8145 is bare since this goes to cycling limit switch which is not used on 8045

The wiring diagrams appears below:



Nov 10, 2010 | Paragon 8145-20 Defrost Timer

1 Answer

I need wiring diagram for Paragon 8154-20. The plastic board has melted

I think you have the 8145-20 240V
This is a time-initiated defrost timer

Paragon 8145 page

Wiring for 8145

Wiring diagram shows both 120V and 240V
L1 L2 is 240V
L N is 120V


Website that explains defrost cycle

Oct 11, 2010 | Paragon 8145-20 Defrost Timer

1 Answer

I have installed 3 paragon timers and this is the first to give me trouble. When the defrost cycle started it did cut off but the timer was stuck on defrost. Many techs have done strange things to the...

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.

This defrost time can be used for both hot gas and electric heater defrosting so check to see which defrost type is being used.

Feb 05, 2010 | Paragon 8145-20 Defrost Timer

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