Carrier AHU, Aux Heat Disable

[SonicExplorer]

Hello,

I'm having issues with a new system inhaling electricty. I'm very confident aux heat behavior is at the core of it so I want to verify how to elminate the aux heat from the picture temporarily. I've removed the stat wire, but that not will not guarantee the elimination of all aux heat conditions. The Carrier FV4C Series AHU Manual doesn't state if it is okay to remove the AHU aux heat wire from the circuit board when the element is actually installed. It only says to ignore that wire if NO element is installed.

Is the consensus that it is okay to remove the AHU wire from the board so I can monitor the system tonight and confirm/elminate the aux heat as the problem? I strongly suspect the answer is yes, but on the outside chance there is something non-intuititve is involved I thought it better to be safe by posing the question first to validate.

Thanks,

Sonic

[Southern Mech]

Sonic, why do you keep opening new threads for the same problem, dude there is 5 already.

If you disable the electric heat when the unit defrost's you will get cold air for a while, you can get a very big temp swing in the house.

Quit messing with stuff and let your contractor fix this rig.

[SonicExplorer]

Sonic, why do you keep opening new threads for the same problem, dude there is 5 already.

If you disable the electric heat when the unit defrost's you will get cold air for a while, you can get a very big temp swing in the house.

Quit messing with stuff and let your contractor fix this rig.

The tech is coming this weekend but in the mean time not only will it help stem the bleeding on my electric bill but more importantly it might provide additional insight into the other issues (or the relationships between them). Which might prove helpful for the tech to know when he gets here. I can ask him the same question and I'm sure will get an answer, but right now is the time when getting a verification on the aux heat situation would be most effective.

[Southern Mech]

My advice to you is you want to stay comfortable, so eat the pwer consumption. Now I have eaten a power bill for a customer I did a change out on cause I had a wire shorted in the stat that brought the electric heat on every time the heat pump called, It was my mistake and I made it right. The customer was nice about it and I piscked up the cost of my mistake. When they fix it I reccomend you be nice and ask the company to pick up the slack in the bill, it's only right, it's there fault.

[beenthere]

Sounds like a DIY question, which is not allowed by site rules. :toetap:

[Roadhouse]

Go to your house's main electrical service panel and turn off MAIN breaker and keep it off 'till service tech arrives. :)

[beshvac]

Are you sure you are not a DIY'r? What "Techs" put you off until a Holiday weekend?

Looking at some of your other threads...this unit was just installed this month, how do you already have a electric bill that makes any sense?

[Southern Mech]

He's a DIYer, and from Florida, retired and has nothing better to do. 7 Threads on a new instal with nothing but problems, and ferry tale diagnosing. I have helped the man as much as possible, I am patient but wearing thin here. It's always some different off the wall jazz, Vacume, lack of flush, Knocking in the A/H, Charge concerns. He has had more help than what we are supposed to do within the rules of the site. I am asking for an address to send a bill.

[Southern Mech]

Go to your house's main electrical service panel and turn off MAIN breaker and keep it off 'till service tech arrives. :)

He'll apreciate the extra 100 bone power bill then. Shut her down, and shoot it.

[SonicExplorer]

My advice to you is you want to stay comfortable, so eat the pwer consumption. Now I have eaten a power bill for a customer I did a change out on cause I had a wire shorted in the stat that brought the electric heat on every time the heat pump called, It was my mistake and I made it right. The customer was nice about it and I piscked up the cost of my mistake. When they fix it I reccomend you be nice and ask the company to pick up the slack in the bill, it's only right, it's there fault.

Very good advice Mech, and that is exactly the way I would normally approach things. But I've learned after living too many years around this town that I'd be wasting my time even making such a suggestion, to almost any company. Sad, but true. There is almost no sense of responsibility and stepping up to do the right thing any more. You know what I can almost guarantee the reply will be? "Well, look, we took care of the problem and it cost us $X in tech trips, so....." Seriously, that's the mentality. They flip it around and make their own incompetence or screw-ups YOUR fault. I'm telling you guys, you just have no clue how bad it is. Why in the hell do you think I took all this time to research things in advance, and am now trying to help get to the bottom of things? I have 20 other important things I'd rather be doing than learning (or trying to learn) this HVAC stuff for which I'll have almost no practical application (or at least recollection of) in the future.

Anyway, another reason I want the aux heat temporarily disabled (for sure) is that I get the sense from some wording in the manual that certain settings the AHU logic board MIGHT be making some decisions regarding aux heat (seperate from anything having to do with defrost) trying to be smart about keeping things comfortable. I am in fact getting some wide heat swings at times, when the unit is not in defrost mode, that logically don't seem could be happening unless aux heat is engaged. It's just another variable I wanted to get out of the way before the tech arrives.

[Roadhouse]

Sonic, my previous post only meant that you shouldn't be messing with any of this as too much can go wrong so don't go turning off the main breaker to your home as that was a joke, obviously.

If the control board fries because of you messing with the wires then it's on you and not warranty.


The same for your home fire insurance.

[beshvac]

Where exactly is your town?

[Roadhouse]

As a matter of fact, if that control board or ANYTHING goes wrong now that we all KNOW FOR FACT you have been messing with the wires, you by all rights at any time down the road could be held responsible and the warranty now null and void, on pretty much anything on your system.

If your techs were to come on here and invest half as much time checking on you as you spend trying to overide them, I'd be the first to tell them you admitted you messed with the wiring.

You are not a pro for a reason, get that through your num nut.

Now leave it alone.