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Ok so I had a question

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Ok so I had a question
Submitted: 1 year ago.Category: HVAC
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Answered in 1 minute by:
11/18/2016
HVAC Technician: Rick, HVAC Supervisor replied 1 year ago
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 22,332
Experience: 40+ yrs. experience as a licensed oil & gas technician.
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Customer reply replied 1 year ago
I was trying to install a honeywell lyric thermostat and it didn't have a c wire so I went up to the attic and found a wire that had no designation a connected it to c and then tried connecting my thermostat I heard a buzzing sound in the attic. The thermostat didn't work and I turned off breaker . So when I tried to install the thermostat back it didn't turn on ac. I went to the attic and saw that the blade fuse was blown. I replaced it and it worked for about 5 minutes and then stopped. I went back up and the fuse was still fine...so..don't know what might of happened. When I turn the breaker on the fan outside works but the ac in the attic doesn't
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8,502
Experience: Furnace, A/C and heat pump specialist.
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Can you attach a photo showing me what wire you connected to and provide model on furnace?

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HVAC Technician: airheatman, HVAC Technician replied 1 year ago

OK if you connected the C from thermostat to that C, you sent 120 volts to the thermostat and possibly fried it.

The C,208V and 230v are high voltage connections. You would need to connect to the smaller wire on opposite side of transformer

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HVAC Technician: airheatman, HVAC Technician replied 1 year ago

Move the C wire from thermostat over to the small black and we will see if thermostat comes on or if it received damage

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Customer reply replied 1 year ago
Ok the thermostat didn't have a c wire. I bought a honeywell lyric and it requires a c wire to work....my old thermostat ran on batteries so it didn't need one...so I saw a wire that didn't have a designation at the thermostat traced it up in the attic I then connected it to the c picture I sent you.
HVAC Technician: airheatman, HVAC Technician replied 1 year ago

I totally understand. The problem is that the C you connected to is a line voltage 120 volt wire. You can not connect there. The low voltage circuit comes off the opposite side of transformer.Your C from thermostat should connect o that small black wire , not the C you connected it to.

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Customer reply replied 1 year ago
Ok I understand. What small black wire are you talking about? Another thing is that when I tried to install the old thermostat and put back everything the way it was ..ac doesn't work anymore. Condenser fan turns on out side but no air blowing in the house
HVAC Technician: airheatman, HVAC Technician replied 1 year ago

The small black wire beside the red one on back of transformer. If blower is not coming on you may have burned up the control board that controls the blower.The reason you popped fuse is by having R fro thermostat connected to 24v and C from thermostat connected to 120v, you created a dead short.

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Customer reply replied 1 year ago
Ok so what is my next step?
HVAC Technician: airheatman, HVAC Technician replied 1 year ago

If you have a multi meter I can help you troubleshoot.Otherwise you will need to get a meter or call in a technician.

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Customer reply replied 1 year ago
I do have a multimeter
HVAC Technician: airheatman, HVAC Technician replied 1 year ago

Excellent. First lets do this. Start at transformer where you connected C wire.

Check for 230v between the C and 230V

Then check for 24v on back side between Red and Black smaller wires.

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Customer reply replied 1 year ago
I currently have breaker off ...do I turn it on
HVAC Technician: airheatman, HVAC Technician replied 1 year ago

Yes

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Customer reply replied 1 year ago
Ok so when I turn breaker on ...Condenser fan turns on do I disable the fuse box near it or I leave it running during the testing
HVAC Technician: airheatman, HVAC Technician replied 1 year ago

If thermostat is wired, Lets makes ure it is OFF

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Customer reply replied 1 year ago
Ok between the c and 230 I get 242....between c and 208 I get 218....on the back side I'm getting 28v
HVAC Technician: airheatman, HVAC Technician replied 1 year ago

Excellent. Now have you moved the C wire over to the small black?If not do so now

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Customer reply replied 1 year ago
Ok so I had the black one and wrapped the wire around it and I accidentally touched the body of the furnace and their were some sparks. I now know it's the brown one and to shut off the breaker near the furnace before doing anything
HVAC Technician: airheatman, HVAC Technician replied 1 year ago

OK, so lets connect C from thermostat to that brown (sorry, it look black in first pic). Then let me know what you have connected at thermostat

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