Question about Heating & Cooling
On Saturday I installed a new thermostat. According to the thermostat hotline I must have touched the blue (c) and red (rh) wires together and blown the transformer fuse. I went down to the bryant payne 517E fan-coil and fan unit, opened it up and uncovered the motor (below) and wiring on top. looked inside for a (car) fuse looking thing to no avail. What does the fuse look like? Supposedly it should be easy to replace.
I am not familiar with this air handler, but I haven't found too many with fuses. You just blow the transformer... but if you found a place that says there is a fuse, maybe there is.
If you can use a volt meter, check the voltage between the red and blue wire in the thermostat. It should be 24 volts AC. If it is there, your problem is something else... Some might suggest you use a short jumper wire from the red to the green and see if the fan comes on to check your 24 volts if you don't have a meter, but I would never suggest that...
If you determine that the 24 volts is not there then you should find that transformer in the air handler and follow the leads out and see if they lead to the fuse, if it exists. You might consider that the transformer is bad if you can't find a fuse. If able, check the primary for your supply voltage, 115 or 230 volts AC, and the secondary, 24 volts AC.
If your lucky, someone that is familiar with this model will answer with all the locations, etc...
Always be careful when working with electricity. If you decide to get into the air handler to troubleshoot your transformer, turn off the breaker while exploring and only turn it back on when you are ready to make voltage measurements and are confident that you know what you are doing.
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Posted on Jan 02, 2017
Hopefully there are markings on the old t-stat as to what terminal is what.
on the honeywell 8000 use the heat pump labeling and then the standard wiring would be
There should not be a bare wire, it probably just has the insulation stripped back way too far.
You should probably open the furnace and compare the terminal label in the furnace to the wire color. normally yellow and blue pass through the furnace and are wire nutted to wires going to the outdoor unit. In the furnace the white wire will connect to the w or w1 terminal. also, you will need to set the Honeywell stat to have the following parameters.
other parameters that I did not specify, you may read the manual and make your own decision but I recommend factory settings for the other parameters
Posted on Jun 18, 2008
what I have always been told is if your 24 volt side burns out check the high volt side if the hi volt side burns out check the low volt side.
A quick way if the primary side is burningout due to a problem with the low volt side:
1 MArk all the thermostat wires at the indoor unit
2 Disconnect them at the indoor unit.
3 Check main line voltage before proceeding (A 208 volt is not considered 220V and 240v Is not considered 208V> In these circumstances the voltage may have changed with the power company replacing a transformer and now you need to change the main power input lines at your control transformer for the correct operating voltage). If okj then proceed:
4 If you have an amp meter attach it to one of the lines going to the transformer.
5 Apply main power and listen for hum, note if smell starts again and if so problem has to be in board or main incoming voltage too high or too low. Amp draw should be less than 3 amps.
6 If your to this point and still havent found any trouble in the above as of yet, Connect the wire marked "C" together. Then just touch the thermostat wires one at a time to the places where they go on the indoor unit and watch the amp meter. If you donmt see the meter jump the circut is probably ok but leave them disconnected until you touch all of them to the correct place or wire. Here is a possible problem I ahve seen a thermostat wireing problem if the wires are stripped too far and a "whisker" of the wire sticks out and allowes one of the other wires to cross short out. In this case just cut off the excess wire or bend it over out of the way asnd continue with the test. You can always cut it off later after the tests. If you see the meter jump up and stay up and /or blowes the fuse the wire that you used and it blew is where to consentrate.
7 No wiring problem found means that you could have a relay or contactor not pulling in properly.
and this will cause the amp draw to go way over the transformers power out put or VA rating.
8 Inspect the thermostat wiring for the "whisker" I mentioned above.
9 If you have done this to the end of the thermostat wires and your main incomming voltage is correctly wired in on the transformer andf your relays and contactors are pulling in evenly and not delaying excessively your problem should be fixed.
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Posted on Apr 25, 2009
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