Which thermostat wire to use?

[garya505]

My HVAC guy will be coming over to install a new thermostat (WR 1F95-1291) and do a fall furnace cleaning/startup. We're relocating the t-stat and he asked what kind of wire (how many conductors) I want him to put in. I've been thinking about putting in a heat pump and humidifier and I mentioned this to him. So, it kind of depends on what I eventually put in, but I'd like to have as much flexibility as possible for wiring stuff in.

[wahoo]

Put in at least 8 wires, and if he doesn't protest, then have an additional 4 wire pulled at same time. That way you can put in any type HVAC unit with options. But get at least 8 wires!

[garya505]

Put in at least 8 wires, and if he doesn't protest, then have an additional 4 wire pulled at same time. That way you can put in any type HVAC unit with options. But get at least 8 wires!

I think he said he could put in up to 18/12 wire. Maybe I'll just have him put that in then I'm covered for anything I might want to add in the future.

[clarkie]

Just make sure it is 18 gage. Don't go for that economy 22 gage crap, it will only give you problems.

[heaterman]

Use a Honeywell IAQ and you only need three.

[garya505]

Use a Honeywell IAQ and you only need three.

I already bought the WR 1F95-1291 because I want to run humidifier w/fan when heat is not ON (the IAQ can't do that).

[seatonheating]

I already bought the WR 1F95-1291 because I want to run humidifier w/fan when heat is not ON (the IAQ can't do that).

Simple solution really. Just have him pull the 12 wire he said he would. Sounds like he is on top of things, why are you asking us??

[beenthere]

I already bought the WR 1F95-1291 because I want to run humidifier w/fan when heat is not ON (the IAQ can't do that).

Who told you that lie???

The IAQ can run the fan to humidify when there is no call for heat.
Plus. You wouldn't hear the clicking of the stat relays.

[beenthere]

Simple solution really. Just have him pull the 12 wire he said he would. Sounds like he is on top of things, why are you asking us??

I'm wondering the same thing.

[garya505]

Simple solution really. Just have him pull the 12 wire he said he would. Sounds like he is on top of things, why are you asking us??

He said he could put in up to 12 wire. I guess I sounded to my HVAC guy like I was a little undecided about what I might want to install in the future, so he wasn't sure what I wanted.

[garya505]

Who told you that lie???

The IAQ can run the fan to humidify when there is no call for heat.
Plus. You wouldn't hear the clicking of the stat relays.

If I recall correctly, the IAQ requires a call for heat or the last call to be for heat to activate the humidify output. No?

[beenthere]

It won't add humidity during, or right after a cooling call, that is correct.
So if your trying to add humidity in the summer cooling months, it won't.

It will in the heating season though. And as you said, it has to have had at least one heating call to activate the humidify function.
But after that first heating call. It can humidify any time, weather to not its doing a heating call. Until either the system switch is set to off, or it does a cooling call.

So are you trying to add humidity in the cooling season.

[Airmechanical]

you surely wont need more than 12 wires

but some o.d. stats need there own 2 seperate wires running to the stat

tell your a/c tech what control methods you require

if he's not sure how many wires to run (as you implied), he may not be the right guy for the job



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