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Is that a local thing? Trane is union here but Daikin isn't.

I figured that some here hadn't, that's why I linked to the manufacturer's info sheet. I see it occasionally around here, but I wouldn't use it myself.

But many people go nuts when they see...

From the link...

I'm not familiar with PTACs, why is this?

That flex pictured appears to be B-vent, judging by its connections.
http://www.mtlfab.com/media/L1940.pdf

Where is that required? Seems like a lot.

That's me all the time. It's bad enough as it is, but the office always has the nerve to ask why I have so many unfinished jobs. "Why can't you just stay onsite until you can close it out?" Yeah, I'd...

That's no small task. Theoretically it should work, but you'd have to rework the entire harness at the board and extend a lot of the wires that only reach exactly where they need to. Cut off all the...

Right, I assume there’s a reason but I can’t imagine that this is an actual problem here.

I didn't think that Carrier approved side returns for downflow applications, maybe thats a newer thing. The manual I think is the right one says no.

Not complicated at all. Small TXV that takes some liquid and puts it right back in the suction line. Keeps the compressor discharge temperatures down....

How is Carrier forcing you to buy their thermostats? You seem oddly fixated on the thermostat thing. Heat/Cool thermostats are just as common as HP ones, maybe even more so. And most thermostats,...

Which part are you referring to? Its just the way Carrier does it. Different than everyone else, but I don't see how its any worse.

Its been almost ten years, I hope he wasn't waiting for an answer.

Carrier package heat pumps are a little different in that they use conventional 2H2C inputs. There’s no external control of the reversing valve. The defrost board manages that. For these units, the...

Why the combination of single wall pipe and B-vent? Is there some reason that the draft hood connector cant go right at the inducer?

Its not that old. Current model unit, manual is from last year.

Then why 240Ω? That math doesnt work out very well

This is the only method that I am familiar with.
...

That appears to be some sort of current transmitter, which is the only way I am aware of to convert a voltage signal to a current one.

The thread you linked seems to be a lot of responses not...

Its a good opportunity to learn commercial work, IMO. You can make the step from residential to light commercial, and go from there. My own experience was that after 4 years there, I had gone as far...

Apparently it does, since that's the way it is. But could you explain why?

Everything I know about Ohms law regarding 4-20 signals820913 says that this cannot be correct. This is straight from the Carrier 30RAP manual, in the section about MotorMasters. Am I...

Correct, I assumed that was implied. I personally have never seen a MC coil that wasn't aluminum. Doesn't mean they couldn't exist, I guess.

Unless its something like a puncture wound on the outside that's easily seen and accessed, most MC coil leaks cannot be repaired. With those, you get some fins out of the way, clean it real good, and...

The angle goes the other way. If it were a 45 off the heater, it would still be pointing up. 90 is whats installed there, more than 90 is pointing down, like it is now,
...

You can only do that with communicating ZS sensors, they may not be using that kind. Regular ones like the T55 could be on there, too.

If the pin spacing is the same, that may work on the local access connector, but it's not the proper connector. Easier to make a custom cable on a 4-pin mini Phoenix than try to source that specific...

Attached is the last order for these that I made from Mouser, the part numbers should point you in the right direction. As to Phoenix connectors, the 3.81mm spacing ones are the mini-Phoenix used for...

I assume you're looking for the connector that plugs into the Rnet ports, not the 3 pin phoenix at the adapter itself?

Yeah, I could use one of those too. I spent a bunch of time searching for...

If you're referring to my comment about covering up a CoreMax fitting, of course it's better to fix it.

But unless you want to pull the entire charge, as I said, the CRT for that type of fitting...

Can you link a picture, I'm having trouble visualizing what you are referring to. What do you mean by "back over"

I'm intrigued by your makeshift oil separator. It makes perfect sense, but I would have never thought of doing that.

I'm not familiar with that particular unit, was there no way to drain the oil...

He could be using 2 legs off a corner-grounded delta system, but that seems highly unlikely, nigh impossible in residential

When you see this code, is it static, or does it scroll across the display? If it scrolls across, that's not a code, that's the board telling you its software number. The boards starting with 8 do...

Maybe this?

http://www.columbiamt.com/CMT-Marking-Stamps/Embossing_Dies.html

Looks expensive

If I could get a hold of that guy, I would. He's gone and I'm trying to not only learn all this stuff, but fix lots of stuff that hasn't been right from go.

I think I basically understand the how, I was wondering more about the whys. About the use of network schedules in iVu.

This particular site has a mixture of network schedules from the old CV and...

Can anyone explain the network schedules a little bit and how iVu interacts with them? I get that, for example, a CID vav can be configured as a schedule broadcaster, and it can send out the...

The 38AUD would fill the bill here, but its equal size compressors. It can come with a HGB on the lead circuit, but not a digital scroll. I think, but I'm not sure, that HGB in this case is actually...

Some of the office buildings that I go to are still 99% unoccupied with employees working from home, but the management had the ChEng force the OA settings to their maximum amount of ventilation...

It's probably 3/8 fittings you're thinking of. It's a common size for 4-port manifolds, usually used for the vacuum pump connection.

Core removal tools typically come in 1/4 and 5/16.

By the...

Shouldn't that connection to the WH be a dielectric?

The next size up from 1/4 flare (not counting 5/16) is 3/8, should be the same size as the large connection on 4 port manifolds. That's probably it. There's bigger available, but unlikely to be found...

I certainly would use the proper OEM for a brand new machine, or any machine under warranty.

Beyond that, sometimes it just depends on whether I need it right now or not. Solest 120 is available...

Is that fan and flex duct approved for use as a kitchen exhaust?

I think maybe I'm circling some answers, but I still have a very long way to go here.

Maybe not with this particular controller, but perhaps with anything similar in concept, has anyone observed...

I know how they work, I was asking if the unit was a 3 stage unit , that might explain the behavior that OP was asking about.

Are you sure that's not a 3 stage cool unit? Y1 comp1, Y2 comp2, Y3 both?

Calling tech support is the problem, there are no electronics allowed on the premises. I would like to be able to talk to them while I'm in front of the controller, because I forget things that I've...

Also, that may not be necessary. I know an ABB ACH550 will control a tower fan VFD on its own with just a water temp sensor, using the macros. All it needs is its own temp sensor, and a DI S/S, off...

Is anyone familiar with these controllers? I have the instructions for it, but it doesn't go into a lot of detail, I was hoping there was a longer technical document or something like that. The...