p45 oil pressure cut out switch HELP!

[BatesTech]

Just changed a 15 ton copeland semi hermatic in a Rudd condenser old as dirt. Dont ask why to much politics above my head. Need help cant even find m and s number so owner of the building been working on unit everything, everything wired wrong. I am putting new safetys on when I wire the johnson p45 should I tie the heater into the pressure cut out or can I use a aux contact on the compresser contactor?

[sprmktrefertech]

If you're talking about the CCH,then, yes wire to N.C. on the aux.

[BatesTech]

10 4 THANKS

[BatesTech]

Need more help please, wiring the johnson p45nca12 oil pressure cut out. 208/230 3 phase copleand using a 230v coil relay to make and break 24 compresser contactor. Replaced it already thought I followed wire diagram on back of the cover to the oil cut out perfectly but I am obvisouly missing something.

[ascj]

Need more help please, wiring the johnson p45nca12 oil pressure cut out. 208/230 3 phase copleand using a 230v coil relay to make and break 24 compresser contactor. Replaced it already thought I followed wire diagram on back of the cover to the oil cut out perfectly but I am obvisouly missing something.

2 legs of 230 on the LOAD side of contactor goes to t2 and 230v connections. Your 24v feeding your contactor should be in series with L and M.

I hope that helps.

[BatesTech]

and the jumper .......... does it stay between 2 and m? And L and m do they open and close my relay for the 24 v to the compresser contactor using what volt coil.....

[sprmktrefertech]

and the jumper .......... does it stay between 2 and m? And L and m do they open and close my relay for the 24 v to the compresser contactor using what volt coil.....

In your case...you have a 240v relay controling the 24v coil at the contactor?

the jumper is removed if using different voltages and a 4 wire hook-up.

L and M with jumper removed is just a switch...

[sprmktrefertech]

In your case...you have a 240v relay controling the 24v coil at the contactor?

the jumper is removed if using different voltages and a 4 wire hook-up.

L and M with jumper removed is just a switch...

to clarify....if you keep the relay then you can leave the jumper and wire 230v to the 230 term and to the one side of the relay coil the other side to M on the ofc.

then...break your 24v control cicuit thru the N.O. contacts of your relay...or remove the relay and remove the jumper in the new oil control...and follow the directions as given by Ascj.

what happened to the wiring diagram that came w/ the control?:cheers:

[stanbyyourword]

I always hated those wiring diagrams w those oil fail controls and still do! the way they tried to simplify the wiring with contactors lights controls made it a mess , stan

[BatesTech]

I will take the relay and jumper out, wire line voltage to 230 on ofc and different leg to 2then L and M in series with compresser contactor. Can I test ofc by taking 24 v wire off my contactor with compresser not running I should loose my 24v signal in a 120 seconds?????

[sprmktrefertech]

I will take the relay and jumper out, wire line voltage to 230 on ofc and different leg to 2then L and M in series with compresser contactor. Can I test ofc by taking 24 v wire off my contactor with compresser not running I should loose my 24v signal in a 120 seconds?????

if you are to do it as mentioned above....then remember that you are taking 230v from the LOADside of the contactor and removing 24 to the coil will not allow the control to be powered....instead do one or the other:

-remove the cap tube going to the pump. press connection and don't forget to cap it or,put your oil gauge on... unless you want an oil bath....w/the cover in place(as temp. affects the heater inside) start it up and the contacts should open in the predetermined time of aprox.2 mins.

the other way is to use a thin blade screw driver into the slot under the trip arm to simulate no oil press diff. and energizing the heater circuit and opening the L and M...Good luck!!!

[BatesTech]

Got it I am asking these questions because I dont ever want to get whipped by one of these again thanks coach.

[sprmktrefertech]

Got it I am asking these questions because I dont ever want to get whipped by one of these again thanks coach.

Don't worry i got whipped by one as well...I bought the one the that you need to use the armored style cap tubes,and could not figure out why it always times out on oil failure....it was the schrader depressor had to be removed when using them on an oil control.LOL

[BatesTech]

if you are to do it as mentioned above....then remember that you are taking 230v from the LOADside of the contactor and removing 24 to the coil will not allow the control to be powered....instead do one or the other:

-remove the cap tube going to the pump. press connection and don't forget to cap it or,put your oil gauge on... unless you want an oil bath....w/the cover in place(as temp. affects the heater inside) start it up and the contacts should open in the predetermined time of aprox.2 mins.

the other way is to use a thin blade screw driver into the slot under the trip arm to simulate no oil press diff. and energizing the heater circuit and opening the L and M...Good luck!!!


to clarify....if you keep the relay then you can leave the jumper and wire 230v to the 230 term and to the one side of the relay coil the other side to M on the ofc.

then...break your 24v control cicuit thru the N.O. contacts of your relay...or remove the relay and remove the jumper in the new oil control...and follow the directions as given by Ascj.

what happened to the wiring diagram that came w/ the control?:cheers:

This is it I appreciate your patients: if I had a 230v control i would leave jumper in between 2 and m wire one leg on load side of contactor to 230v terminal on ofc take it to the relay then run m to other side of relay..... I am missing something again. Sorry I just want to know this inside and out.

[sprmktrefertech]

This is it I appreciate your patients: if I had a 230v control i would leave jumper in between 2 and m wire one leg on load side of contactor to 230v terminal on ofc take it to the relay then run m to other side of relay..... I am missing something again. Sorry I just want to know this inside and out.

If you mean 230v control circuit....yea, leave the jumper 'cause that will bring the power from t-2 to M and continue the circuit to one side of the contactor coil..the other side to 230-term and L to the load side....I really think what is tripping you up is the wording...uh if you would just look on the pdf I sent or google copeland OFC wiring bullitin to see it it is much easyr....or check the diagram that came w/ the control...once you see it,you'll understand.

[BatesTech]

Not comfortable taking cap tube off pump their is no schrader. I need to test it because I tried wiring it everyway possible except the right way make sure I did not damage the heater. What would happen if I put on ofc 230 and T to line v instead of load could I test it by removing my 24v control to contactor and test voltage at wire after 120 seconds?

[sprmktrefertech]

Not comfortable taking cap tube off pump their is no schrader. I need to test it because I tried wiring it everyway possible except the right way make sure I did not damage the heater. What would happen if I put on ofc 230 and T to line v instead of load could I test it by removing my 24v control to contactor and test voltage at wire after 120 seconds?
No!!!then remove the crank case cap tube and check it that way.and... there is never a schrader in the oil connection,only in the top where your gauge goes.

Here this should clear up any problems you are having...:gah:

http://www.hvacrinfo.com/cope_ae_bulletins/TAE1095.PDF

....this also will show you how to "test" the control properly.

[jpsmith1cm]

I've read through this thread and I still don't know what he root problem is.

Why do you suspect a problem with the OFC?

[BatesTech]

I've read through this thread and I still don't know what he root problem is.

Why do you suspect a problem with the OFC?

Originally I wired ofc: 230 to L1, left jumper in between T and M, L on ofc to T2 of contactor and M to my relay 230v coil making or breaking my 24v other side of relay on my T3. Thought I could test it taking control voltage of contactor to compresser and 120 seconds lose my signal. Diddnt work so from there tried wiring threw trial and error replaced ofc thinking I wired it right.

[BatesTech]

How to wire the johnson p45 oil pressure switch with 120 volt controls and is the jumper used. I am using a 480 to 120 volt transformer.