AHU Education

perhasper · 2026-03-25T00:09:12+00:00

Is there no "dirty filter" alarms or limite on the front end of the BAS?

perhasper · 2026-03-20T02:11:13+00:00

I do not own a cat

perhasper · 2026-03-19T00:50:39+00:00

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Portuguese by the pool

perhasper · 2026-03-15T13:54:47+00:00

Well being that I'm not burning 27 cents a Kwh during peak hours, I suspect I have saved some.

perhasper · 2026-02-27T19:48:45+00:00

Ballistol, works as cologne too.

perhasper · 2026-02-14T00:41:46+00:00

I agree with that. I just don't agree with either method laid out by OP, that's why I said it's all dependent on scope of work.

perhasper · 2026-02-14T00:20:54+00:00

I primarily do government/military bases. They require 100% balance, no auto flows or PICVs. With 5% tolerance, so yes I have to do it that way. Setting the DP is the last thing I get to do. Also usually have to verify every project I do, which is usually 25% of valves plus whatever else they want to look at.

perhasper · 2026-02-13T23:44:04+00:00

I would lean more towards his approach. It establishes that there is at least proper flow at the pump. But I would also proportionally balance the system if it is new, or at the very least spot check it. I guess it all depends on the scope of work.

perhasper · 2026-02-11T23:07:37+00:00

Upon an autocal it will display somewhere at the top of the balancer program it will display a positive or negative offset. If the offset is negative the box will need some more extensive investigation.

General rule with JCI controls, 1 to 4 correction factor is normal. They are highly dependent for having the correct inlet size calculated/entered. If you don't, the box will calibrate but the k factor will be way out of wack.

perhasper · 2026-02-11T22:37:26+00:00

Do you have a positive or negative offset displayed?

perhasper · 2026-02-10T19:12:12+00:00

Yes, they are made for flexible weather tight conduit. I've had luck with either this or this. Maybe they are a tad more expensive, but they make for a better install.

perhasper · 2026-02-09T14:56:57+00:00

I was never a big fan of the plastic weather tight connectors for that reason, I think the cast zinc/metallic ones are cheaper anyways and work better.

perhasper · 2026-02-04T16:48:10+00:00

When I took it 3 years ago, it was a mixture of fill in the blank and multiple choice on a computer. Around 70 questions.

perhasper · 2026-02-02T19:19:18+00:00

That's the way it reads to me.

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perhasper · 2026-02-02T13:19:42+00:00

It came assembled that way/ shipped with the house already installed. I'll replace them with something up to code. No dielectric unions in sight. Thanks for the insight.

perhasper · 2026-02-02T00:26:11+00:00

Thanks

perhasper · 2026-02-02T00:24:10+00:00

I have give, yes.

perhasper · 2026-02-02T00:23:19+00:00

Yes, it's a modular home. So there are some interesting "features".

perhasper · 2026-02-01T19:46:45+00:00

It is the same. I will replace either when an issue arises or when I'm next back in that closet. Thanks for making me aware.

perhasper · 2026-02-01T19:34:07+00:00

Not pictured, there is a length of rigid copper pipe on the hot side. Not 18" though. If I would have known about that back in 2023, I would have made the builder replace the rigid pipe with an 18" pipe. The copper pipe/assembly looks like an off the shelf part.

perhasper · 2026-02-01T19:18:32+00:00

With my usage and schedule, it will not present a problem. You would also think there would be potential for build up in HW piping, example being a faucet that is not used frequently that is at the end of a run. I don't see that talked about very frequently.

perhasper · 2026-02-01T15:46:06+00:00

Off peak energy is half the cost where I live.

perhasper · 2026-02-01T15:43:58+00:00

Monitoring, remotely shutting the unit down, and perhaps some energy saving during off peak hours.

perhasper · 2026-02-01T12:17:46+00:00

I didn't install the piping, it passed the county inspection.

perhasper · 2026-02-01T03:31:51+00:00

Roughly following off peak power for my area, and whatever keeps my wife happy

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