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Thread: busted belt gone wrong
10-24-2009, 08:13 AM #1
busted belt gone wrong
also tore up some control wiring in its pathTo err is human, to really screw things up takes a service manager
10-24-2009, 09:48 PM #2
I've got a Lennox that did that. Took out the wiring to the condenser fan motors and wrapped them and the belt around the motor shaft. When it shorted it took out the fan relay, 1st stage compressor contactor and the control board. 460v on the control side isnt too good.Zach
10-24-2009, 09:51 PM #3Regular Member/Bad Email Address
- Join Date
- Jun 2000
- B.C. Canada
I had a Lennox also do that, L-series unit flattened the discharge to the condensor.
10-25-2009, 09:00 AM #4
this was on a 50 ton carrierTo err is human, to really screw things up takes a service manager
10-25-2009, 03:35 PM #5Regular Guest
- Join Date
- Apr 2006
allso lookz lick the wrong size belt on that unit needs a bigger belt
11-07-2009, 10:02 AM #6
no that used yo be correct size... worn then snappedTo err is human, to really screw things up takes a service manager
11-07-2009, 01:28 PM #7
i've seen that happen on a new rooftop unit where the balancing guy had opened the motor pulley to the point the belt wedged in the pulley and then snapped. took out a lot of control wires. It looks to me like the motor pulley is opened up too far in this unit also, you might consider putting a smaller pulley on itSteamfitters Local 602
11-08-2009, 08:22 AM #8
good observation, included in repair was a new sheave... yet adjusted much further closedTo err is human, to really screw things up takes a service manager
11-08-2009, 09:06 AM #9Steamfitters Local 602
11-08-2009, 09:15 AM #10
air/amp draw was low in the first placeTo err is human, to really screw things up takes a service manager
11-08-2009, 09:53 AM #11
The adjustable sheave on this motor appears to exhibit little or no wear.
I find it best when working with adjustable fan drives to use a reflective tachometer, when speed comparison or adjustments become necessary.
The power of the motor changes the cube of the speed. A small variation in fan speed is a much larger change in power.
Just a hint from a regular member.
11-08-2009, 06:59 PM #12