York RTU Nightmare

[Push It]

He had it running while he went to go get parts. When he came back it was shut down but inducer was running. He changed out parts and it would not fire at all. He said he checked all the safeties and they are good.

He lit it with a torch. Did not check gas pressures and safeties and left it running while he got parts? Is that correct? If so you better talk to this kid. Sounds like you could have several problems, he has no idea what he is doing or he cannot explain what is going on. I would never had lit it with a torch. Check yuor gas pressures to the pilot and manifold to see if you have gas. I would get another guy out there even if he thinks he fixed it. Good luck

[beenthere]

Open rear panel and reset the high limit.

[timebuilder]

I will check that out. I did not even get to that site today. Have no idea if he got it running either. To busy with my own work.


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Let us know. On the small York RTUs, I have not found a high limit reset. If it is not fixed yet, see if the power coming off the heat relay is still intact, and go toward the module from there.

The recent vintage Sunline units (York RTUs smaller than the Predators) have a problem with the heat relay being mounted upside down in the controls section, and they collect water until the relay fails. Just an FYI on that aspect, since you may run across that failure in the future.

Pictures would be good showing what you find, too.

[qwerty hvac]

Let us know. On the small York RTUs, I have not found a high limit reset. If it is not fixed yet, see if the power coming off the heat relay is still intact, and go toward the module from there.

The recent vintage Sunline units (York RTUs smaller than the Predators) have a problem with the heat relay being mounted upside down in the controls section, and they collect water until the relay fails. Just an FYI on that aspect, since you may run across that failure in the future.

Pictures would be good showing what you find, too.

Update. He got it running today. Said it was the sequencer in the controls compartment. I never did go to site. He said the gas pressure was to specs of 3.65. After he replaced the part the unit fired right up. It was weird how before he worked on it their was gas and spark but no ignition then after he had nothing. Since I never saw it I am just guessing like everyone here.


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[socotech]

As Beenthere said. There is a limit in back panel that often gets overlooked. I have also had to drill a small hole in pilot tube at spark ignitor to get ignition.

[2sac]

Sequencer for gas heat? Time delay possibly? Not sure of the age of the unit but the newer Sunlines have 2 separate boards in them plus a heat relay. The ignition board clears errors itself and the main board locks out the unit.

[slctech]

When the RTU has horizontal duct you have to remove the top panel and inner HX panel to get to the primary and secondary switches. Real PIA.

[beenthere]

Ask him if he found that sequencer inside the side discharge panel(back panel). If so he reset teh high limit, which will trip if you shut the disconnect off during a heat call with teh burner running.

[2sac]

Ask him if he found that sequencer inside the side discharge panel(back panel). If so he reset teh high limit, which will trip if you shut the disconnect off during a heat call with teh burner running.

You talking about the 3 wire limit correct?

[qwerty hvac]

This was in the control panel with the contactors and relays. I know about the limit by the heat exchanger. That was the first thing I had suggested.


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[beenthere]

You talking about the 3 wire limit correct?

yep.

[qwerty hvac]

After looking at the wiring diagram I think he was talking about the ETD. Electronic Time Delay.


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[2sac]

I reread the post. Sounds like the initial problem is/was the crossover tube and/or clogged pilot orifice and/or spiders nest. This is why he had to light with a torch. Does this unit have the blue Johnson Controls ignition modules? Those are designed to have multiple voltage inputs for them to fire. Even though you have 24v at TH, if any limits are open the inducer will run but you will not get spark.

[qwerty hvac]

I reread the post. Sounds like the initial problem is/was the crossover tube and/or clogged pilot orifice and/or spiders nest. This is why he had to light with a torch. Does this unit have the blue Johnson Controls ignition modules? Those are designed to have multiple voltage inputs for them to fire. Even though you have 24v at TH, if any limits are open the inducer will run but you will not get spark.

He said they were grey boxes which means they were replaced. I think those are UEI boxes?


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[2sac]

Not familiar with UEI the Honeywell universal is grey, and I thought JC did make grey boxes at some point in time but I could be wrong.

[qwerty hvac]

Not familiar with UEI the Honeywell universal is grey, and I thought JC did make grey boxes at some point in time but I could be wrong.

I have one in my truck. I will check tomorrow and let you know the make. I know it's the JCI replacement.


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[valdelocc]

Call P&J !! we fix it the first time!!

[timebuilder]

The JCI replacement is the black UEI box.

[qwerty hvac]

Call P&J !! we fix it the first time!!

That's funny this guy is from P&J and said he learned everything he knows from you. All kidding aside, I just wanted to get the kid some other thoughts on the issue since I knew I would probably not have time to go down and check out his issue. But he figured it out and learned a little from it.


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[timebuilder]

The JCI replacement is the black UEI box.

Here is the replacement style module.