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Old 03-30-2009, 06:31 PM   #16
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trane xv80 gas furnace


"Technically" it is a 3 phase motor. They convert the house A/C voltage to D/C. The motor has 3 windings like a 3 phase motor and the 3 large capacitors and works off a varying D/C voltage. It is a single phase as there is no 3 phase power to residential homes. I looked up Trane XV series and it is variable speed.

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Old 03-30-2009, 06:34 PM   #17
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trane xv80 gas furnace


Quote:
Originally Posted by yuri View Post
"Technically" it is a 3 phase motor. They convert the house A/C voltage to D/C. The motor has 3 windings like a 3 phase motor and the 3 large capacitors and works off a varying D/C voltage. It is a single phase as there is no 3 phase power to residential homes. I looked up Trane XV series and it is variable speed.

Hey Yuri that is not always true. I have 3 houses that I service every summer that are three phase. The only item connected to 3-phase is the condensor. The city is just waiting for them to go out so the wild leg can be removed.
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Old 03-30-2009, 06:36 PM   #18
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trane xv80 gas furnace


Hope they never change 2 leads and run everything backwards. LOL
Gonna watch Steve Wozniak (Apple co-founder) do the Lindy hop or Tango, Dancin with Stars, hope he doesn't hurt himself.

Last edited by yuri; 03-30-2009 at 06:39 PM.
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Old 03-30-2009, 07:37 PM   #19
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trane xv80 gas furnace


Half the techs out there can't diagnose an ECM motor correctly.

As much as you want to save your friend money.
An improper check on that motor. Can damage it, if it is good.

Testing the board isn't as easy as just checking for voltage at the terminals. Since the motor receives 110 volts, weather or no it running.

It isn't until the module receives its low voltage signals that it will run.
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Old 03-31-2009, 03:06 PM   #20
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trane xv80 gas furnace


I need help trying to figure this out? Can somebody please help me? What is a open high limit device?
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Old 03-31-2009, 03:23 PM   #21
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trane xv80 gas furnace


It is a device that shuts off the burner when the furnace gets too hot. Has 2 wires going to it and sits in the metal wall above the burners. Usually has a temp in degF stamped on it anywhere from 165 to 250 degF. Some Tranes had a problem with the circuit board giving false limit switch open codes. The control should be checked with an ohmeter with the wires off for continuity. Caused by lack of airflow, fan motor not working etc.

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