[dlwalker]

I am an 11 year victim, I mean veteran of this industry mostly in the res. and light comm. end. I am also NATE certified, but I have come to an impasse.

We did a "charity" install of some bryant 674 dual-fuel packaged units at a church. Initially I hooked up HW FocusPro 8000s w/ OD sensor and expected everything to work great as they have a thousand times before. Every indicator on the screen came on. Every word and number possible. Of course even with the batteries in, no calls went out.

So I jumped out the unit at the LV connections. Everything works great.

Installed a HW 5000 for temp use and with the c wire attached stat "powers" on and off every 3-4 seconds. Works fine without common wire.

Installed Bryant DF stat thinking maybe there is a funky incompatibility thing or something going on. Same thing, on-off, on-off.

Now I am pulling hair out. Single phase 245VAC coming in. 26VAC on r-c at unit.

There are 3 units and 2 are acting funny this way. The Carrier/Bryant tech rep said, and I quote "I didn't even know we sold dual fuel packaged units." Not much help there.

Can anyone suggest something that will help me through this. Could it be dirty power? Ghosts? At a church? This is outside anything in my experience or education.

I tried a new xfmr and that was no help. If anybody can point my brain in a direction, maybe I'll get it. I'd hate to start throwing circuit boards at it. And why 2 and not all 3? AAGGGHHHH!

Thank you in advance.

 

[BaldLoonie]

We had that happen on a VP. Turns out the installer shorted out the 2 wire to the outdoor sensor and something got fried in the stat.

 

[BobbyBJr]

Yeah, weird one for sure and yeah, churches do have ghosts...lol.

Bobby

 

[sadlier]

Make sure the user setup on the 8000 is correct for the system.

When the voltage is being read across the stat at RC (preferrably in Min/Max mode) does the meter indicate a drop in voltage as the stat cuts in and out?

Whereas everything is working great at the unit it is sounding like it might be trouble with the thermostat wire. Check for any resistance to ground or between wires. Did you use 18 AWG or 20 AWG wire?

 

[Airmechanical]

I am an 11 year victim, I mean veteran of this industry, I hooked up HW FocusPro 8000s w/ OD sensor and expected everything to work great as they have a thousand times before. Every indicator on the screen came on. Every word and number possible. Of course even with the batteries in, no calls went out.
So I jumped out the unit at the LV connections. Everything works great.



when you say no calls went out you should have
stopped right there and figured out why.

 

[t527ed]

you jumped at board and all was well. try hooking up t stat with short piece of new wire and see what happens. could be bad wire.

 

[Shophound]

Agree with the wiring call. Might also want to see if there's a separate time clock somewhere, since you have two units doing the same thing.

 

[ARPA]

Just a FYI:

The original poster is not listed as a pro member. (DIY issues)

 

[Richard Kletty]

Yeah, weird one for sure and yeah, churches do have ghosts...lol.

Bobby

Sorry to get off topic but... I dig that Tele Bobby... Mines a brown sunburst 06 model. Maple neck. I play the 06 Brownburst Strat most of the time though. Cant beat it with the 900 series Marshall running Yellow Jackets...

New Years Eve is coming and Ive gt a sweet gig with the band...

Opps forgot... Not a music site LOL

 

[johnnyde]

ghost in the church

I have seen this problem too many times. Baldloonie is right , the sensor wire is shorted. Check the sensor wire your probably going to find a small voltage reading on the sensor. Sorry to say also the stat is FRIED. Our problem was we were using some cheap t-stat wire, and what we found was the insulation around the wire was too thin, the wires would short together inside of the bundle. I had one that had almost 5 shorts in an 18-10 wire. I was getting anywhere from 4-16 volts on alll 5 wires. Needless to say we have since changed to a different brand of wire. good luck and let me know how it turns out.

 

[1hero]

how long of a run your t-stat wire & what size it is plays a big part in your voltage drop from your transformer. you just might need to put in a biger kva transformer. that might help.