Blower Fan Speeding up and down

Thread Tools

Search this Thread

06-15-20, 02:37 AM

rducros2

Member

Thread Starter

Join Date: Jun 2018

Location: USA

Posts: 14

Upvotes: 0

Received 0 Upvotes on 0 Posts

Blower Fan Speeding up and down

Hi everyone. Looking for some advice on this.
My System :
Furnace - American Standard Freedom 80 Comfort R with Variable speed fan
Condenser - Allegiance 16 4 ton with 2 step compressor.
Thermostat - Ecobee 4

Noticed last night that the blower fan is speeding up and down. Even took a video of it. Link :
https://www.youtube.com/watch?v=KIYJ4T7N2IE

From what I've read online, many refer to the fan relay. I don't think I have a seperate fan relay that can be changed. The blower motor cables hook upto the control board. Image :
https://imgur.com/gallery/fzhmVf6

Blower free spins by hand. Doesn't feel like fan bearings are bad or anything that would cause drag.

So what do y'all think? Motor going out? ECM going out? I have a spare control board... should i try changing the board and see if problem goes away?

Blower Motor - 1 HP 115v MOT09233
ECM - D341314P05

Image - https://imgur.com/gallery/pkOEUHi
Any help would be greatly appreciated

Upvote

06-15-20, 10:47 PM

PJmax

Group Moderator

Join Date: Oct 2012

Location: Jersey

Posts: 71,675

Upvotes: 441

Received 3,333 Upvotes on 2,992 Posts

The blower is supposed to change speeds during operation.
Is it just changing speed during cooling ?
Try dropping the thermostat five cooling degrees.
Does the blower still react the same ?

Those ECM motors can be a problem to diagnose.

Upvote

06-15-20, 11:25 PM

rducros2

Member

Thread Starter

Join Date: Jun 2018

Location: USA

Posts: 14

Upvotes: 0

Received 0 Upvotes on 0 Posts

The blower changes speed erratically. Stays high for a couple seconds, then low. No matter what the thermostat temp is calling for. The only speed changes i know of with the system is the comfort-r setting. Where it will run the fan at a lower speed at startup for a few mins to help reduce humidity. Then it will ramp up to full speed.
I've ordered a new ECM and Motor. Hoping the new ECM will take care of the problem. If no, new motor going in as well. I realize the system is 14 years old, but knock on wood... it's been pretty bulletproof so far.

Upvote

Thread Tools

Search this Thread

Show Printable Version

Email this Page

Air Conditioning and Cooling Systems
What is this wire. It looks like a tiny brush.

S

Sherri97 on May 30, 2020

I just have to figure out where this one wire goes before I put everything back together. So I took my Window Unit apart to clean it. It fell 6ft out of the window. After hammering the tray back into shape and a bracket on the motor it still works! But I have one red wire that needs to go back [i]somewhere[/i]. I don't know what the technical words are for everything so I'm putting lots of pictures in a sharable link(there are too many upload into this post), the wiring diagram and the model number that links to A/C on the Fridgidaire website. after my description. The wire in question: Attached to the 'Anion Generator'. The end of it looks like a tiny brush. It has what looks like electrical tape wrapped around the end of it. I found a place that looks like it had electrical tape on it. Maybe this wire was taped to it? It looks like a small copper pipe about the sized of a straw. The copper pipe comes from the compressor,(I do know it's compressor) and lead into the coils in front of the the front fan. There is also a sticker on the styrofoam. It says 'Do Not Remove'. It has no apparent purpose, but I saved it just in case. Maybe it has something to do with this wire? If you know what this is and where it goes I would really appreciate the help! Thank you [b][url=https://www.frigidaire.com/Owner-Center/Product-Support--Manuals/?productCode=lra087at7][color=#16a085]Fridgidaire Model Number LRA087AT7 [/color][/url][/b] [b][url=https://drive.google.com/drive/folders/14ve2zvYcmldIsMd-8mOwDnRok5MmURdm?usp=sharing][color=#16a085]A link to all the pictures in one folder for your convenience.[/color][/url][/b]
Air Conditioning and Cooling Systems
Will I need to replace HeatPump lines???

W

wraiththe on Jun 14, 2020

HI, [b]I currently have 5/8" and 3/8" copper lines[/b] in my split heat pump setup. a [b]new[/b] 410a system is spec'd to have [b]3/4" and 3/8" lines[/b]. [b]Is it OK to use what I have? My current setup is a 1.5T condenser downstairs out front and a 2 ton handler in my laundry room, the condo is on the second/top floor. I am going to have the system replaced very soon and the thought of having the current lines replaced is making my head spin.[/b] New system may be 1.5T or 2T preferably with Variable spd fan set up to dehumidify a little more.. Professionally installed by licensed HVAC guy. This is from a book, the bottom one is from a manual....