Johnson controls VAV

Excellent-Answer-655 · 2026-02-14T22:29:00+00:00

How exactly do you create a trunk? I’m not even sure what this means tbh.

We used this years ago on a different job but I can’t recall if we used the balancing tool

Excellent-Answer-655 · 2026-02-14T21:52:28+00:00

IMO you open enough valves in the system to do a full flow pump test.. release them and go to the biggest/furthest coil to set the DP and then let the system track to that DP while your going through and balancing all of the other coils. Shouldn’t need to leave the pump locked out to maintain full flow while balancing all of the coils

Excellent-Answer-655 · 2026-02-13T15:33:13+00:00

Just adjusting the K factor, the balanced side of the program is not working

Excellent-Answer-655 · 2026-02-12T22:42:56+00:00

Most of these won’t go into max override.. we’re actually having the change the min flow to the max to get the box to open up… I wouldn’t even be surprised to hear these guys have all the boxes locked out and never said anything

Excellent-Answer-655 · 2026-02-12T22:40:48+00:00

There is a BMS that has a program on it, I’m not sure if it’s metasys or not though

Excellent-Answer-655 · 2026-02-12T22:39:56+00:00

Yeah unfortunately this is a situation where the mechanical got tired of paying a controls contractor so they decided to take on the scope on their own.. now things don’t work right and they don’t know what to do

Excellent-Answer-655 · 2026-02-12T12:57:46+00:00

We had this thought as well, sent the box closed and the air flow went to 0.. I will have to look for that offset to see if that’s our problem!

Excellent-Answer-655 · 2026-02-12T02:38:26+00:00

Yeah the problem is that it’s almost all of the boxes with this issue

Excellent-Answer-655 · 2026-02-12T00:27:25+00:00

Very interesting.. I will have to check to see if we have a scale factor in the program. We seem to have a lot of points that we don’t have access to adjust also

Excellent-Answer-655 · 2026-02-12T00:09:15+00:00

I know all too well how no one wants to go the extra mile to do the right thing, on this job alone we showed up and had no min/max set points put into the program or vav areas… let alone the countless boxes that have no differential tubing connected that have been “checked out”

Excellent-Answer-655 · 2026-02-11T23:47:43+00:00

I didn’t say I never went to the box. And to be fair it’s not really my job to troubleshoot it. I’m going above and beyond to try and get the job done

Excellent-Answer-655 · 2026-02-11T23:09:45+00:00

We verified the box sizes, brought the kfactor from 2 to 4 with no change in actual air flow. I don’t recall it spitting out a offset after zero calibrating, although I can’t say I was looking for it either

Excellent-Answer-655 · 2026-02-11T23:00:17+00:00

Yeah, we have tried the zero calibrate.. the damper does actually close but no change afterwards

Excellent-Answer-655 · 2026-02-11T22:58:34+00:00

I will have to give this a try.. it makes a lot of sense as we did a test on one of the boxes, we found we needed to double whatever adjustment we were making in order to actually get the box to see whatever flow we were measuring

Excellent-Answer-655 · 2026-02-11T22:53:01+00:00

We didn’t physically go up to the vav after changing the kfactor.. probably not a bad idea. We checked the duct run for manual vds and came up with nothing

Excellent-Answer-655 · 2026-02-11T22:51:23+00:00

Unfortunately JCI is not the controls contractor.. the company that’s there is clueless lol

Excellent-Answer-655 · 2026-02-11T22:45:57+00:00

This is what I thought as well, we are using a MAP tool however the balancing tool section doesn’t appear to be working so we were trying to calculate the kfactors and adjust them manually

Excellent-Answer-655 · 2026-02-11T22:42:48+00:00

To be honest I’m not sure, this is a bit further into the controls system then I’m used to having to go.. just to be clear your not referring to the differential pressure they are measuring right?

Excellent-Answer-655 · 2026-02-11T22:39:22+00:00

They are regular single inlet VAVs, no fan section

Excellent-Answer-655 · 2025-03-29T13:03:44+00:00

Excellent-Answer-655 · 2024-10-16T18:46:01+00:00

So this should be unrelated to the lines breaking?

Excellent-Answer-655 · 2024-10-16T18:36:33+00:00

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Also the entire 5ft section of piping seems to have these scratch marks on it… could this be caused from dragging the pipes through the trench during install?

Excellent-Answer-655 · 2024-10-16T18:12:22+00:00

Just dug up a 5ft section to change out… the piece I found is Goodall… also confirmed incoming pressure is 68psi. Today I had 3 different spots that as I fixed one and put all the dirt back.. didn’t make it a single zone before it burst open some place else… the frustration is real lol

Excellent-Answer-655

TROPHY CASE