unit needs resetting over and over??

[VTP99]

I know, I'm just looking for a miracle....

Or a Paul Harvey

[sdtech]

Time,
Last time VTP99 posted and explained it real good and how the circuit connected to economizer to CLO. This morning i'm looking at the wiring diagram and we want to make sure there is no open circuit each one of those components parts. If we go back how the circuit connected and follow each components in a circuit you can find some may be open that's why C1 coil not pulling in. Here is the circuit connection that VTP99 laid out last posted, Y1 Blue to economizer plug in #2 connected #5 Gray to CLO1 terminal #2 to NC contact terminal #3 to HPS to LPS to C1 contactor coil make sure no open circuit there. And the common wire of C1 coil is Brown connected to FPT (Freeze up Protection Thermostat) which is Black wire connected to Brown common side of the 24VAC transformer. Let say the 24VAC RED make and passed to Y1 and you follow each connection should catch the open circuit as you go. And the FPT is common side make sure not open. I think we are good there, Thanks

[sdtech]

VTP99,
Any luck on that Carrier unit yet!

[VTP99]

VTP99,
Any luck on that Carrier unit yet!

Sd,
Time put a shout out for Gary in Tulsa but so far no post yet. Sometimes you get that here. No end to the story It was Gary in post #1 that was pushing the contactors in.
Time,
Did you dig up a old board to bench test ?

[Jettaknight]

Sounds like low line voltage to me. time for a new transformer?

I remember once where the unit was rated for 208v or 240v. The transformer had spade connectors that could be set for either voltage. Same problem as the OP described was happening. Turned out it was the transformer. 208v was supplied but the transformer was wired for 240v. Not enough voltage to pull in the contactors.

However this one is a 12 ton so its probably 208 or 575 3ph. I'd still be looking at the transformer...

[sdtech]

VTP99,
Yeah I understand how things out there alright men hope Gary come back and tell us. Thanks...

[sdtech]

JettaKnight,
Yes it can happen my friend

[VTP99]

I remember once where the unit was rated for 208v or 240v. The transformer had spade connectors that could be set for either voltage. Same problem as the OP described was happening. Turned out it was the transformer. 208v was supplied but the transformer was wired for 240v. Not enough voltage to pull in the contactors.

However this one is a 12 ton so its probably 208 or 575 3ph. I'd still be looking at the transformer...

Jetta,
It's a 10 ton unit 012 equals 10 ton by Carrier's nomenclature. ( It's a carrier thing ) Your right about the trasformer line taps. I see that mistake often. Also i believe he said it was 480 volt 3 phase.

[timebuilder]

Sd,
Time put a shout out for Gary in Tulsa but so far no post yet. Sometimes you get that here. No end to the story It was Gary in post #1 that was pushing the contactors in.
Time,
Did you dig up a old board to bench test ?

I'm hoping to find one on an upcoming changeout.

[Dallas Duster]

Sd,
Time put a shout out for Gary in Tulsa but so far no post yet. Sometimes you get that here. No end to the story It was Gary in post #1 that was pushing the contactors in.
Time,
Did you dig up a old board to bench test ?

With all the tornadoes out there in OKlahoma maybe that RTU is not on the roof still and Gary is OK no pun intended.

[VTP99]

With all the tornadoes out there in OKlahoma maybe that RTU is not on the roof still and Gary is OK no pun intended.

thegoodlistener,
I haven't been watching the weather channel lately. Any of those tornadoes touch down by you ? Those things will put the fear of god in ya.

[Dallas Duster]

thegoodlistener,
I haven't been watching the weather channel lately. Any of those tornadoes touch down by you ? Those things will put the fear of god in ya.

We had a F1 hit my small east Texas town about 3 weeks ago. It didn't hurt anybody but it messed up lots of roofs and older buildings. Plus it really messed up my favorite DQ.

[VTP99]

We had a F1 hit my small east Texas town about 3 weeks ago. It didn't hurt anybody but it messed up lots of roofs and older buildings. Plus it really messed up my favorite DQ.

What no more Tin Roof no pun intended.

[timebuilder]

We had a F1 hit my small east Texas town about 3 weeks ago. It didn't hurt anybody but it messed up lots of roofs and older buildings. Plus it really messed up my favorite DQ.

Mmmmm. DQ.

I think I should go out and get a hot fudge sundae after my exam today....

[VTP99]

Mmmmm. DQ.

I think I should go out and get a hot fudge sundae after my exam today....

I read that in the other thread. I have been delaying that test myself because of all the jokes associated with it. Hope all goes well for you and ya might think twice about fudge after that test.

[timebuilder]

I read that in the other thread. I have been delaying that test myself because of all the jokes associated with it. Hope all goes well for you and ya might think twice about fudge after that test.

LOL!!

I'm going to have a real meal first, trust me. I haven't had food since Tuesday night.

This is my third exam in eight years. The jet co insurance paid for the the first two. This one is out of pocket, since my current co has no health insurance. One of our guys had a heart attack, so we can't afford to insure the rest of us.

Even so, I'm glad that I can pay for this and have it available, rather than have it be free, and not be able to get the care.

I usually tell the Doc that if he finds Jimmy Hoffa, I want the book and movie rights.

[timebuilder]

1) No problems found

2) Nice steak at Outback.

[timebuilder]

VTP99,
Yeah I understand how things out there alright men hope Gary come back and tell us. Thanks...

Okay, back to the thread.

Gary, give us an update.

[garytulsa]

ok thank you everybody who gave me advise! I found the problem it was going off on CLO. I jumpered and the contactors sucked in put my gauges on and wow high pressure. The hvac tech before me must have charged it beer can cold. I recoverd some refrig and put the correct charge on it. Now it runs fine. The unit conditions a kitchen and there is alot of heat load which may have been why the guy charged it like he did who knows. Being new to the facility I was told to only reset it and not givin the chance to take any time with it. Again thank you everybody you made me look good to the boss! Sorry I didnt post sooner. I had a major problem with a very big York chiller. I got it running seems something wasnt right in the programing. I am clueless on that unit but it's running. Good thing I have you guys as back up lol.

[garytulsa]

Oh thought I would clarify a few. When the unit first went off on my watch. I looked for a call for cooling had 24v to Y1 & Y2. Checked for 24v to relay, good. Checked for line voltage to contactor good. Also ohmed out the contactor coils, little to no resistance. I did check voltage to the contactor coil but after I pushed in the contactor. (Stupid of me) After seeing what time had to say and others I went back and when the unit went off again. I tested it as it sat. 24 to y 24 to relay. No voltage at compressor or outdoor fan contactor coil but voltage to indoor contactor coil. Good line voltage going to contactor. 24v goin to both CLO's but no voltage coming out. I tested voltage at the pressure switches but got nothing. I tested voltage to compressor 112 on each leg. I jumped 2 & 3 at the CLO and it fired up. Then I tested amps to compressor. around 15 amps. put the gauges on and 80 lo side 375 pisg. I had just cleaned both coils earlier. Fans on and good air flow.