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Some heat pump RTUs have conventional terminals. W1 fires heat pump in heating, Y1 in cooling, no O/B terminal. Possibly this is what you have. Is it working how you have it set up?

I would set...

All right...some one is going to have to call John Tomczyk ::DD:

I’m union. The company buys all the tools and they are company tools so we cannot take them when we leave. We have accounts with the local supply houses and a hardware store, so for minor stuff I...

One of my coworkers who did a lot of PMs was always finding cracks in Carrier heat exchangers. Carrier sent us an email stating that they were only “cosmetic cracks” and wouldn’t be warranty’d unless...

Could be a number of things. If you like the company you’re using, ask for a more experienced tech. Otherwise you need to find someone that knows what they’re doing.

Maybe the new owners will fix the like button :whistle: :angel:

:cheers:

Are you asking if ice on distributor tunes is normal? It is normal.

I’m definitely in the camp of sub cooling is what it is with a receiver...I typically see 2-5 degrees. Maybe your comment was sarcastic? In this situation, since the head pressure is elevated so...

65 psi R22 saturation temp is 37.5. Hard to believe it’s cooling the box at that saturation temp, maybe keeping it in the low 40s. Also you have no superheat. I’d expect to find high subcooling....

Did you measure sub cooling?

Unions can offer that kinda pay. $75K???...Our industry can do better than that. An experienced tech should easily be clearing $100K.

We have a bunch of Genie brand ones, they’re pretty decent.

I do a fair amount of start ups...over half of the equipment has something wrong from the factory. As far as service calls, it’s mostly failed parts. I see some improperly installed stuff but it’s...

I’ve only used Appion and Inficon. The Appion G5 twin is far superior and I’ve been very pleased with it.

So this is a site with lots of unit heaters and only five have problems. These five are in different buildings. The problem is not common to them all. One possibility is they failed one at a time and...

I’ve worked on worse.

Imperial tools are built to last, Diversitech not so much.

Burner clean? Igniter positioned properly and clean? Proper pilot pressure?

I replaced a Carel suction temp sensor last week connected to an exv controller...reading 288 degrees. One of my coworkers replaced one on a different circuit on that system a few weeks ago. He spoke...

No, .1 or .2 ohms is not a big deal.

I work on a -40 walk in. It uses 404A and two stage Bitzer compressors. Suction runs a slight vacuum when approaching set point. It’s in a plasma donation facility with locations around the country....

You’re static pressure at start up should correlate with ambient conditions. Based on your pressures either the evap or condenser is in 100-130 degree ambient. Sounds like high load, especially now...

True, but gotta get the hgb under control first to diagnose that. Hgb shouldn’t be maintaining an above normal suction pressure.

High suction doesn’t indicate a restriction. Sounds to me like high load or a hot gas bypass problem.

I’ve run on the inside of copper drains before. On one job, a large warehouse freezer, I’ve ran two through and hooked up one. That way if one fails, the maintenance guys can hook up the other one.

How hard is it to clean the lint out of the coils?

How much superheat when the pressures are high, where are you measuring it? Just to confirm, you have verified that hot gas bypass is not raising the suction pressure...if so, how have you verified...

We typically use 120V Raychem self regulating heat trace. We stock rolls of it at the shop and termination kits so it can be cut to length. We have it on a separate circuit from the evap. Use copper...

What’s the deal with the tv?

If I’m doing service I put stuff away after each call and bill the customer. If I’m on an install I organize and restock once the install is done and bill for my time. I don’t like organizing my van...

You need the BACnet module that connects to the microtech controller.

Just pump it down. There shouldn’t be any need to recover the charge.

Plumbers putty would work.

I completely agree, there’s absolutely no excuse for standing by silently while someone does something dangerous.

You can always back it off slowly. If there’s a schrader it should stop hissing before you have it unscrewed all the way.

Did you keep water flowing through the barrel while recovering the charge? If not, the refrigerant boiling off could certainly freeze the barrel.

Megohms to ground probably wouldn’t trip a breaker immediately kilohms certainly could. OP...what meter are you using to check resistance to ground? Hopefully you’re not just using the continuity...

When you say the compressor is not shorted, did you check windings and to ground?

I completely agree with everyone. An accounting degree would be a waste of time. Just hire an accountant. A mechanical engineering degree would be beneficial for sure. The owner of the company I work...

Do you have the tools to recover and weigh in a factory charge? I’d top it off, but topping off a charge is a bit of an art form. There’s a lot of factors to consider. If you have to ask how to do...

Certain types of fans will have an increase in amp draw with an increase of return air static pressure. A squirrel cage blower wheel will not. Whether this is possible or not, depends on what type of...

That really doesn’t answer any of my questions :gah:

What type of blower wheel does this unit have? Is the VFD set at fixed speeds, or is it modulating? How is a motor drawing 25 amps blowing a 30 amp fuse? What’s the max current setting in the VFD?

Yup...I’d still give it a shot though. Typically when a powerhead fails the valve shuts.

I usually use a rebuild kit, but if the supply house just has a new valve I’d definitely rob the guts from it. Rebuilding the valve will almost always fix it, very rarely is the problem with the...

Can you just rebuild the TXV? That’s usually my first choice.

If my choices are only a suction service valve and a discharge service valve, I choose the discharge valve.

I agree on the charging. Metering in eight pounds into the suction line with the system off is a bad idea.

Not necessarily, but it’s a bit unusual.