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airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8385
Experience:  Furnace, A/C and heat pump specialist.
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I have a Carrier 8000 TS Weather Maker unit and in the past

Customer Question

I have a Carrier 8000 TS Weather Maker unit and in the past day or so the fan unit for the central house blower made strange noises and got worse. Finally it just spins but no air and horrible noise.
Submitted: 2 years ago.
Category: HVAC
Expert:  airheatman replied 2 years ago.
Hello. My name is ***** ***** I'll do my best to help. Let's get started and see what we can do.Sounds like the blower wheel may have come apart. Cam you turn power off, remove both panels and take a flashlight and lets check it out?It will be in bottom panel
http://i.imgur.com/wsHBPJx.jpg
Customer: replied 2 years ago.
All blades are still intact and attached to the motor. It spins.
Expert:  airheatman replied 2 years ago.
Possibly a bearing noise. With power off if yu spin blower wheel by hand do you hear blower wheel scraping against side of squirrel cage or a roar from motor?
Customer: replied 2 years ago.
Not really. I did switch the power back on and pressed the switch making the unit think the cover was on and it sounds like a very loud zip tie. You know that zzzzzzzzzzzzzzzzzzzzzzzzzz. Nothing moves but after the power is off, the fan assembly moves freely.
Expert:  airheatman replied 2 years ago.
I wonder if maybe set screw has loosened on motor. With power off, hold motor shaft and see if blower wheel will spin on the shaft.
Customer: replied 2 years ago.
Nope. Tight. I thought the same thing. This is making me nervous. Is this looking like the electric motor is fried?
Expert:  airheatman replied 2 years ago.
Does motor have a bell control on end? See below"
http://i.imgur.com/x8QYdhA.jpg
http://i.imgur.com/er2BUGr.png
Customer: replied 2 years ago.
Here is a photo of it. Have not taken it out yet.
Expert:  airheatman replied 2 years ago.
OK it is not an ecm motor that I was asking about. Take a flashlight and watch the blower wheel, hold door switch in and see if wheel turns on call for cool.
Customer: replied 2 years ago.
It turns just fine.
Expert:  airheatman replied 2 years ago.
Will the blower wheel spin on the shaft if you hold the shaft still?
Customer: replied 2 years ago.
no.
Expert:  airheatman replied 2 years ago.
Let me ask this, If you turn it to cool allow motor to start and then shut off, watch direction of wheel and tell me if it is turning right direction.The blades have to "SCoop air"
Customer: replied 2 years ago.
They are scooping air.
Expert:  airheatman replied 2 years ago.
Does motor appear to be running as fast as it should?
Customer: replied 2 years ago.
Any ideas yet?
Customer: replied 2 years ago.
I don't see my last comment. The motor/fan is not turning extremely fast.
Expert:  airheatman replied 2 years ago.
I might suspect capacitor if motor was running slow, but that would not create the noise. What I do not understand though is even if noisy we should be moving air.Can you check ductwork to make sure there is nothing broke loose.?
Customer: replied 2 years ago.
Looks alright and my wife had her hand up to a vent and told me it is moving air. Not as much as normal. barely moving.
Expert:  airheatman replied 2 years ago.
If you have a meter that reads capacitance, turn power off unplug brown wires form capacitor and lets check it.A weak cap will make it turn slow, Capacitor is only about 10 bucks at an appliance parts store. I would probably start there.
http://i.imgur.com/THtfswG.jpg
If this doesn't solve, I suspect the motor itself.
Customer: replied 2 years ago.
I don't have a meter. Where is this capacitor located? You have a photo? Do I need to pull the blower assembly out?
Expert:  airheatman replied 2 years ago.
You should be able to get to cap without removing blower assembly. Usually on side of housing. I have to leave office so I will open to other experts so you are not waiting. Will check in tomorrow morning to see if you get fixed.
See below for cap location:
http://i.imgur.com/GHkf7DA.png
Expert:  airheatman replied 2 years ago.

I see no one was able to assist you yet.I am back in office if you would like to continue with this.