HVAC Service Call Loud RTU Loose Broke Belt
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- Опубліковано 11 вер 2018
- I get an HVAC Service Call where the Roof Top Unit is really loud. I find the Blower Motor belt loose and on further inspection about to break. I replace the belt and test the system with new belt.
- Наука та технологія
Hacker knows this but for those young apprentices reading this, before changing the setting on an adjustable sheave you need to check running amps on the fan motor. It is possible that someone before you has already increased fan speed and has maxed out the sheave settings for the allowable RLA of the motor.
Great words of wisdom for anyone that watches this video.
Some of the squeal might be from the use of normal "V" belts. They bulge when they go around a small diameter pulley and eventually wear a rut in the contact surface. Cogged belts don't bulge in that situation so when you put one on a pulley with a groove worn in it, it has a reduced contact surface area and may be noisy. Good call on replacing contactor's every few years. The contacts carbon up pretty quickly and changing them is cheaper than changing the compressor or motor.
We used to replace a lot of sheaves. Once a groove or irregularity wears into the sheave profile, the unit will eat belts because the worn sheaves profile no longer matches the new belt. The poor contact area will also cause it to squeal on startup. Sheaves are a wear item just like belts. I think a lot of the sheaves now days are from China, as the metal wears out a lot faster than it used to. This is also a problem with multiple groove sheaves where one groove will wear differently than the others causing one belt to be looser than the others, even though the belts are a matched set and the sheave is adjusted to the same pitch on all belts.
I am noticing cheaply made continental belts. They are always cracked and breaking when it’s time for maintenace. The other day all but one RTU the belts looked old and dry rotted. Sheaves do seem to wear out and most times guys just keep slipping belts back onto the pulleys. Yet I think a lot of the belts today are also garbage besides the sheaves. I will start to look more closely though at the sheaves since I sometimes might miss a worn out sheave. I was resi heavy with some commercial now it’s the other way around. Seems like I keep getting the dungeon jobs, lie today three 299mbtu steamers tied together for a church. Plugged up drains, all pigtails almost sealed with mud.
Maybe look into some camera glasses so you can film in front of the customer this way they never know and you still put out what could of been good material for the channel. Also, you can use it as backup in case a customer decides they want to turn things around on you then you have proof of the deal that was agreed on or how the job was performed. Just a thought! You have good material I enjoy the channel.
Can always tell a new tech lol good job though
Hello thanks for the video I can put the belt back cause is new I’m using A26 is that. The correct one or I have to remove the bolts from the motor? Thanks
Dayco 93874 Timing Belt Diagnostic Kit it's for cars but could you use something like this
Hi can u tell me what is the belt size?
Sir how many hp motor is in the blower
Awesome repair Bud
Thanks
She'd a tear because im missing you still alright to smile.
I recognized the reiner trucks. I work for HUGHES Environmental Engineering out in Mahwah NJ
It was a split second I forgot to edit. Hahaaa. What's good? I know your trucks also. you, air group and my outing are the big giants in the area'
I actually live in NY so im rarely in the NJ area working. Mostly city work. Enjoying your videos.
You guys do more bigger industrial work. That's what I wish I would progress into. At least I am moving more into the commercial side and out of resi.
Yeah i dont do any residential. Hughes is also big in the refrigeration side as well. How long have u been with that company
since 2009. Got out of LTI 1999
They need to put tags on the inside of equipment so they are out of the sun. I always wrote the belt number on the fan housing. I don't like to leave equipment without a spare belt. Some repairmen leave the belt a little loose because people complain about a banging noise on startup or it burns up contactors. I've replaced contactors with VFDs to provide a soft start to solve both problems.
We swap belts every maintenance and the one we take off the pulley gets left behind as a spare and we throw the spare away. Sucks going out on an emergency call and not having a belt. Some manufacturers put data tags inside which is helpful after 30 years on a roof in all weather.
nice how to change blower plz same unit.....
Sir which motor is engaged in this blower, ac or dc
ac
Sir how many hp moter isin this blower
Im sure the customer would love seeing you throw the door. lol
I can’t sorry bad typo
What is the size of the moter pully and the blower pully and moter hp and blower size plz sir tell me i like your chanal and subscribe
Hey belt was still squeaking bud. Take them mittens off
Pathetic
The part I wanted to see how to put it on
Dudes camera was focus on his Milwaukee tool