HVAC Help Please

 
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Old 04-11-2017, 10:40 PM   #1
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HVAC Help Please


So. I am a carpenter by trade. My family is masons. Know the other trades, blah, blah, blah. the one trade Im useless at is hvac. so I made a custom barn door for someone and it was to hide things on her wall. one of those things was a thermostat. it stuck out of the wall so I replaced it with a smaller thinner Honeywell. hooked up the g the y the o and the r which is bridged to both r's. the old one had the black wire hooked up to the x but the new one said to bury it. "tested" it. the fan blew for both heat and a/c, the a/c worked, but got a phone call that the heat wasn't working. btw. it is a trane heat pump/ air handler in a condo. so I went there today and turned off the circuit and the switch that was wired onto the unit. I put the black wire to the b and turned everything on. nothing happened. turned everything off. dissconnected the black turned it back on. nothing happened. looked for the small amp fuse and I couldn't find one. so I crossed the g wire with the r wire and the fan didn't turn on. I'm guessing no power. the thermostat still was clicking but nothing was turning on. How bad did I screw things up?
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Old 04-11-2017, 10:51 PM   #2
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Re: HVAC Help Please


holy sheet....run quick she's gonna blow.....



me thinks you popped a fuse.

split system or packaged unit?


hopefully a hvac guy will stumble in here.....

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Old 04-11-2017, 10:55 PM   #3
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Re: HVAC Help Please


lol. I'm guessing a packed unit. compressor and wires on the side I can access. its about 4' long. and I couldn't find any fuses.
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Old 04-12-2017, 12:52 AM   #4
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Re: HVAC Help Please


in most cases you can wire the t stat the same as the unit control board. Just cause it says to put the red wire on the R terminal doesn't mean that the other end of the red wire is on the R terminal of the unit. Ya its supposed to be but is it? You likely didn't cook anything more serious than a fuse.
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Old 04-12-2017, 09:16 AM   #5
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Re: HVAC Help Please


the a/c and the fan worked before, just not the heat. Where would the fuse be located? I already looked where the wiring is, unless is a different kind of fuse? trane model gebh03011l210b0010000200000000000
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Old 04-12-2017, 12:55 PM   #6
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Re: HVAC Help Please


Time to call a pro and get it fixed...
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Old 04-12-2017, 11:27 PM   #7
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Re: HVAC Help Please


Black wire to b terminal on the stat, is likely the issue. When there is a call for heat, the b terminal is hot.... Rheem / Ruud gear energizes the Reversing valve in heat mode, thus the b terminal. Most equipment energizes the reversing valve in cool O. Perhaps the black wire should be on the C terminal on the new thermostat.

Not that big of an issue, if the air handler has a fuse. Still not too big of an issue, but, odds are its a blown control voltage fuse.


If this is greek, an hvac guy should make mince meat of this. I prefer hardwired stats as opposed to battery powered, or power stealing....Too much shop talk with that.
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Old 04-13-2017, 12:04 AM   #8
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Re: HVAC Help Please


BTW, remove the black wire from the B terminal, and then check the fuse. And / Or, make sure the furnace is off while messing with the thermostat wire. We have went to many service calls in which the big issue was a blown fuse while changing thermostats.... Due to working on a live circuit.
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Old 04-13-2017, 06:20 AM   #9
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Re: HVAC Help Please


Good chance you burned out the transformer when you connected the black wire(used as a common) to an energized terminal(B heat relay/reversing valve).

Did you program/set up the thermostat for operating a heat pump?

Post model number of thermostat.
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Old 04-19-2017, 08:45 AM   #10
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Re: HVAC Help Please


Thanks all for the help. it was the transformer. there was no fuse installed so I put one on for the future.
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Old 01-02-2018, 02:46 PM   #11
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Re: HVAC Help Please


Quote:
Originally Posted by TimberlineMD View Post
Time to call a pro and get it fixed...
No Kidding! People that work on their own gas systems really make me worry for their neighbors! As a painter I work as a jack of many trades BUT GAS!!?? Not this kid!
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Old 01-03-2018, 09:39 PM   #12
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Re: HVAC Help Please


Quote:
Originally Posted by JenniferTemple View Post
No Kidding! People that work on their own gas systems really make me worry for their neighbors! As a painter I work as a jack of many trades BUT GAS!!?? Not this kid!
I think he's working on a thermostat, not the gas line, so I assume the neighbors made it through this fairly safely

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