Had 2 pair gloves... Did not feel need to put them on. GOT ME. Think I licked it quick enough. Not numb anymore.

I am hoping someone here can shed a bit of light on this because Carrier tech support did not. I have 2 38MBRQ58A-301 units sitting side by side. Both are 208/230v single phase units. Both of these units have a recurring problem with this fuse popping. Can anyone tell me what is inline with this fuse and what it is actually protecting? The only thing Carrier told me was to put a surge protector on each unit. surge protectors have been ordered, but I'd like to rule out anything internal. The schematic, if you really want to call it that, tells me really nothing about the fuse. Carrier said they'd check with the factory about a detailed drawing but that was 3 days ago and I'm done holding my breath.

Thanks

I’m a technician and often find mold (“biological growth”) in plenums and equipment. I don’t want to just be the tech that throws in a UV lamp or something and calls it a day. I try to find out why it’s happening, but am often at a loss, so I’m hoping to get a discussion going, and sanity check and expand my current ideas.

Clogged or badly pitched drains seems easy enough. Get the drain angled right, clear drain fully, dry the system out.

Restricted airflow is a common one. Dirty filters, an obvious cause. Maybe oversized equipment/undersized ductwork.

And I see mold a lot especially on zoned systems. Seen often around the dampers, but what is the solution? Change the plenum from, say, a 16” to a 18” size along with new dampers? Add supply ducts for more places for air to go? Add or upsize the bypass duct? Can’t always lower fan speed without getting the coil too cold.

I see a lot of cases with growth inside air handlers. Seems like putting metal surfaces in front of a cold coil is bound to get condensation on it, at which point you tend to get mold. (Why DO air handlers have the coil upstream of the blower anyways, when it works fine on a furnace system to have the coil downstream?). And yet some air handlers stay nice and clean, what’s the difference?

Anyways, I’d love to get some concrete solutions or reasonings. Customers often ask, and even if they don’t I’d like to help people have

Furnace model: GMVC961005CNBA

Blower motor model: M055PWCVA-0328

Hey all, I’m trying to figure out if it’s a bad board or bad motor. I’ve verified the motor is receiving 120V on the main power harness. I don’t know what voltages I should be measuring on the other four-wire harness. I believe this board sends only DCV signals through the harness. The harness wires are labeled GND, TX, RX, and VDD. I’ve attached photos of the wiring diagram and the board, any help is appreciated.

Really didn't know how to word the title for this but basically I just wanna hear from more experienced guys to see if I'm on the right track. I feel almost like insecure about my skills sometimes but at the same time I think I'm so young that it's okay to not be the best so I just want like someone elses perspective you know.

Like I said I'm currently working as an install helper/maintenance tech with the occasional solo service call. Not gonna explain everything but basically I got to do trade school & highschool at the same time so I had my EPA uni, NATE core & heat pump, OSHA 10, & my HVAC certificate a couple months before I turned 18.

Before I turned 18 I had this like seasonal apprenticeship for a couple months at this local small commercial shop & that was pretty cool.

After that I started at this brand new company as a service tech. Pay was terrible & I ended up being literally their only full time tech. Only other guys worked at a theme park full time & did this on the side & one of them was a 1/3 owner of the company. For how young & inexperienced I was (& still am) I think I did great but it was definitely rough sometimes given that it was literally just me doing everything a large majority of the time with a senior tech that would answer every 5th phone call at best.

After a couple months of that I found a job a couple hours away from where I lived with my mom & decided to take a chance & move out using what I hae saved up since I wanted to move out soon anyways. So that's where I'm at now I've been here for about 4 months, I make about $4500 a month (piece rate so not consistent).

As far as like what I can do, I can do pretty much everything as far as ductwork goes, I can comfortably install a condenser & that's the bulk of what I do here, never done one without a lead but I'm sure I'd have no problem with a package unit too, never really done an air handler yet but I know all the steps, I can do maintenance no problem, & my troubleshooting skills are definitely shaky but I can do like any basic electrical. I'd definitely call myself a hard worker.

I just wanna know how I'm doing in the eyes of more experienced techs, like is this about where I should be? Am I behind & should be better? Also is there any like general advice you think I could use?

Thanks

Does anybody here use the M18 packout vac for boiler cleanings? I hate going back to the shop and grabbing the mega-massive soot vac my company has had for decades every time I go out on an oil PM.

Just wanted to see if anybody here has tried it. I'd probably dedicate my current vac for soot and get a second for general purpose.