trane voyager locking out

[Brokanic]

trane raucc60ee
hi anyone have an idea why this trane locking out. it trips almost everyday or sometimes once a week. by the time i get the call, all the safety controls already closed. anyone has any idea? please help

[ScottBeck]

.10 amp fuses across the the safteys. Have you taken pressure readings? Coil is clean?

[coolerguy]

I would start with basics.. Filters/belt/coils. What your pressures look like ? voltage/amps ? Is there corrosion on UCP board ?

[BKS60]

Circuit 1, circuit 2, Both???

Narrows the possibilities!

[Brokanic]

@BKS60-only the 2nd circuit trips. after i reset the system, pressures, amps, superheat and subcool is good. i'm in the process of putting a tattle tale on all the safeties. belts and filters are brand new.

[Brokanic]

@coolerguy, their is no ucp board on this system, only relays, and timer motors for circuit 1 and 2.

[BKS60]

@BKS60-only the 2nd circuit trips. after i reset the system, pressures, amps, superheat and subcool is good. i'm in the process of putting a tattle tale on all the safeties. belts and filters are brand new.

Make its a lot less to consider. I would obviously stay on the 2ns circuit only. You may try checking all fans for contactors, shafts and amps. Also I would check the lockout relay. i have found that the relays are failing and also the pins on the subbases are not making good contact. The N/O contacts on the back of the compressor circuit breakers have also been known to fail intermittently.

Just a few starting points!

[ktxkrew]

is there any active alarms before you reset the unit?

[BKS60]

I believe that unit will just open the lockout relay. There is not a control display to monitor alarms.

[bredmond]

Sounds like you need to start using some taddle tales to isolate your problem.

[Brokanic]

@BKS60, yes i have bypass the n/o contacts for the breaker of that compressor. and i swap all the relays from the 1st circuit but it still trips. i will try to spin the shaft on each cond fan manually, i only took amps and was under the rated load.

[redcell09]

Is there a freeze stat on the unit? I have had a few Tranes act this way.

[timebuilder]

Go to the terminal board and make sure that every screw is tight. Every one. No wire on it? Tighten it anyway. Some of those are safety connections and jumper strips.

I had a problem unit a couple of years ago, and darned if I didn't find a screw backed out about 3/4 turn.

After that, no problem.