Original message
| fixitnow2
 |  "question on changing blower motor Trane unit"
, posted Thu 21 Sep 20:26  
Help! I am changing a blower motor fan out on a Trane rooftop
unit. Here's my situation: the motor I took out was a GE motor
with 3 wires going to it which I unhooked to get the motor out.
The new motor I have is a AO Smith motor with the following
wires coming out of it - no. 4 & 7 wired together, 5 & 8 wired
together, 6 & 9 wired together. It also has wires 1,2 and 3
that are by themselves. The Trane nameplate says this unit
is 460V. On the AO Smith motor diagram it shows one diagram
for high voltage and one for low voltage. The diagram for high
voltage shows 4 and 7 together, 5 and 8 together and 6 and 9
together. Wires 1,2 and 3 show going to L1,L2 and L3. I have tried to hook it up this way for 460V and when i turn the
disconnect the motor hums and smoke coming out of motor so
I turned power off. What's wrong here????????????????
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Replies:
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| shawn T
| "Re(1):question on changing blower motor Trane" , posted Sat 23 Sep 07:42
Shorty is right. I have had to replace three or four 460v condensing fan motors this year because of bad contactors either letting only partial voltage or no voltage at all across one leg. Last year I had to replace a unit shutoff switch on an 80 ton condensing unit that would very intermittantly reduce voltage across one leg of the contacts.
Remember to vote Republican!
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| shortys
| "Re(1):question on changing blower motor Trane" , posted Fri 22 Sep 22:18
The connections you listed for the motor are correct for 460 volt 3 phase. The problem sounds as if the motor is single phasing. You might check for blown fuse, bad contact on contactor, or broken motor lead wire. Good luck. Smoke from a motor is never a good thing.
"Short on price Long on quality." shortyshvac.com
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| | harpo
| "Re(2):question on changing blower motor Trane" , posted Sun 24 Sep 21:42
IT WS PROBABLY DUST:)......with the power off disconnect the T and L sides of the condenser contactor and manually push the 3 phase bar in and then read with your continuity meter top to bottom 1 then 2 then 3 legs.if your daring wire the 3 feed legs to the motor leads and put up the disconnect to see if direct 3 phase without the CF contactor runs the motor..check those amps!
It ain't going to get any lighter looking at it!
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