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trane xv80 gas furnace

11K views 20 replies 6 participants last post by  yuri 
#1 ·
im trying to help a friend
his blower isnt working
he's been getting the run around
he took the motor out but know one will test it
it looks new (maybe 7yrs, clean) and will turn by hand
havent been to his house to help him
thought i'd ask some questions first
capacitors, relays,possibly thermostat wires
the gas comes on just know blower
any suggestions
 
#2 ·
If it is a V model with a variable speed ECM (electronically commutated motor) that is a special motor which needs a special motor tester. I would recommend a Trane tech for that job as it could be a circuit board problem as well. That is very expensive highly specialized equipment.
 
#4 · (Edited)
You will have to put 110v to the blower to see if will operate.. Test the cap. with v.m.( volt meter) or cap. tester Or, test for 110 v where the plower plugs onto the board.. When it's time for blower to come on you should get 110 v If you get 110 v then it's the blower or cap. yuri is correct . I didn't notice the v variable speed
 
#5 · (Edited)
Unfortunately there is nothing a DIY can do to those motors to test them. Some have a specific circuit board built into the motor which HAS to match the control board. Sorry. Check the owners manual for the warranty. The motor may have a 10 yr warranty. Lennox has that on their ECMs. May not cover the labor/service call.
Pick up a couple of cheap $20 fan heaters from HDepot until his funds improve. Sooner or later you or someone you know may need them. Cheap insurance.
 
#6 ·
thanks
if i check for 110 at the board
will a simple voltage tester(like you would use for electrical recepticle)
with red and black leads work
would i just ground one, dont want to fry his board
probably can get a multi meter
i assume the result should match capacitance
on capacitor
 
#9 ·
There is no capacitor on those motors. You have to test the motor and board together with special instructions to know what the problem is. Unless your are an electronics whiz and can carefully follow Tranes troubleshooting info for it then a Trane tech is required. THat is why the motor shops cannot help you. There is a simulator for some of those motors but it is expensive and only does part of the job.
 
#13 ·
That inexpensive relay is probably the run capacitor on the basic PSC permanent split capacitor motor which the non V furnaces have. In a variable speed furnace the circuit board and the board in the motor are married and have to communicate with each other. The board tells the motor what speed to run at etc etc. THere are specific complex troubleshooting steps for them. BEWARE those are 3 phase motors and have 3 LARGE capacitors built into them which can kill you if not discharged properly. NO user replaceable parts in those motors. The boards are static sensitive and don't tolerate abuse.
 
#14 ·
one last comment
and then ill leave everone alone
you mentioned 3 phase motor
would that be for non ecm motors
the reason i ask is when i looked at his motor
it was definately a one phase motor
so know im wondering if he actually has an xv80
 
#15 ·
If you look at the motor and there are between 4-6 wires Black, yellow, orange, red and two tan wires then this is a PSC motor.

If on the motor there is a 16 pin connector then this is a vs motor. Actually a DC motor.
 
#16 ·
"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.
 
#17 ·
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.
 
#19 ·
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.
 
#21 ·
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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