Carrier Blower - http://www.hvacmechanic.com/ Forums
Original message
| hugh99
 |  "Carrier Blower"
, posted Wed 16 Apr 17:35  
We had to move my our wiring on our Heat Pump Condenser. I am distressed, we forgot to turn off the Air Handler breaker.
The units would not work so we found a 5 amp fuse blown in the Air Handler's circuit board. Replaced this, now the Condenser operates normally but the Air Handler blower will not work.
I don't know what we damaged. The schematic is faded on the Air Handler unit so we are not able to read it. Any suggestions on where to start troubleshooting the blower's voltage? Does anyone have a Schematic on a Carrier Air Handler?
I am an Electronic Tech. so I am very familar with working with AC voltage but don't know where to start without a schematic.
Thanks
KH
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Replies:
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| theduke03
|  "Re(1):Carrier Blower"
, posted Wed 16 Apr 18:00:
It's likely that you blew something else in low v. circuit. Blower motor should be ok. Check tstat connections to air handler, with fan switch on stat set to on, you should have 24v from G to C. No 24v=bad stat. If 24v then check for 230v at blower hi speed connection(or whichever wire is connected to board or relay) and L2. What is the model # of the indoor unit?
Some of the pictures displayed here are brought to you by Houston204. Be Safe.
[this message was edited by theduke03 on Wed 16 Apr 18:04] |
| | hugh99
| "Re(2):Carrier Blower" , posted Wed 16 Apr 20:19
Thanks I will check into that.
I did a quick check on the voltages yesterday and then stopped to do research and ask for help.
It appeared that I was not getting a neutral on the blower motor.
I had 120 volts going in. Does the relay activate the neutral to complete the circuit? Would you recommend or know a way I could short the motor wire to test the blower without damaging it.
KH
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| | theduke03
| "Re(3):Carrier Blower" , posted Wed 16 Apr 20:35
That should be a 230v motor so there is no neutral. I Don't know what components you have that's why I asked for the model#. When G is powered from the stat it will energize the relay or contactor coil. This will close the contacts and energize the motor. The motor will always have 120 on one leg but you have to check for 230 between the two legs that are used. So what's that model#?
Some of the pictures displayed here are brought to you by Houston204. Be Safe.
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| | vandvmechanical
| "Re(4):Carrier Blower" , posted Fri 18 Apr 22:34
If you have 120v going into the unit then it is a 120v blower, not 240v. If you replaced the 5amp (car) fuse and still have no power to the circuit board, you should check the transformer. Also, check to make sure you did not break the G wire during the "moving" process. It is HIGHLY unlikely that you fried a motor by shorting out the control wiring. You can also jump out r ang g to see if the blower comes on. Another good indication of a bad transformer is to see if you have 24v between r and c, if no 24 then change the transformer.
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| | theduke03
| "Re(5):Carrier Blower" , posted Sat 19 Apr 10:28:
quote:
If you have 120v going into the unit then it is a 120v blower, not 240v.
...
Does Carrier make a 120v air handler?
Some of the pictures displayed here are brought to you by Houston204. Be Safe.
[this message was edited by theduke03 on Sat 19 Apr 10:29] |
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