Thermostat help...

[Indy_Guy_77]

Purchased a new programmable thermostat today to replace the 34-y.o. mercury switch round t-stat in our house.

And it seems that I'm electronics-dumb.

It's a typical 4-wire set up, but I'm having trouble translating the "old" wiring into the new device.

It doesn't help that I'd just as soon not ruin the HVAC, blow our house up, or poison the 3 of us with CO.

Attached are pictures of Old & new. I'm hoping someone can help me translate it!

Old:

Labels as follows if you can't see them. Clockwise from 12:00:

green wire = G
blue wire = Y
white wire = w
red wire = R
empty = O
empty = 4

New:

Also, what should I do with the old thermostat?

TIA,

-J-

 

[NYFelon]

Do you have a multi-meter to measure the voltages on the wires? I'm pretty sure the Tstat is low voltage, and pretty harmless.

That said

G = green. RC/RH are jumped together so you can attach the red to either of those. W/B should be white, and Y1 should be the blue.

I am not a plumber, HVAC technician, or other climate control specialist. If you are uncomfortable with my advice, by all means do not use it.

 

[85t5mcss]

Can't help without being there myself, but when I did mine the manual had a very specific diagram on how to wire. I do recall multiple ways depending on how the old 1 was wired. Dumb question, but did u read the install manual? Mine also had more terminals. I think it was because of heat pump and not a gas unit.

 

[Dirtebiker]

The old thermostat does have mercury in it so dispose at a tox-drop

 

[kevman65]

First, the stat circuit is 24 volts, you won't fry anything.

Next its just like your old stat, Green to G, White to W, Red to either R they are jumpered and no concern, Blue to Y1.

Make sure your new stat is level, that is still necessary, once you have the base mounted, batteries installed, and programmed your set points run your system in both heat and cooling modes to make sure everything functions. The only problem would be the Blue goes to Y0 instead of Y1 since we don't have the instructions for the new stat in front of us.

You can cycle heating or cooling by moving the switch to that setting and either raising or lowering the desired temperature until the heat or AC come on.

 

[slottech]

I agree with NYFelon. I used to wire houses in a former life and we used "station wire" which is for telephones. That wire was red, white green & Black. On your old thermostat, Red is hot to the themostat. White activates the furnace. Green & Yellow activate the A/C. But then again, I would refer to the manual. You could also look at what colors are connected at the furnace & outside on the A/C unit.

 

[D.B.]

Green wire is fan control connect it to G, Red wire is 24v power connect it to RH and leave the jumper to RC in place, White wire is heat connect it to W1, Blue wire is cooling connect it to Y1. Read through your install manual, you may need to program the stat for Gas heat vs. electric heat by holding in mode and select then answering a series of questions, some stats have a switch on the back. Furnace should have a switch mounted on the side to turn off power so to not short anything wile mounting and making connections.

 

[Indy_Guy_77]

More info:

Gas furnace, not a heat pump. I've already got the hardware switches on the new 'stat set correctly.

Device in question is a Hunter model 44155c

Yes, I've read the manual.

From the manual:

RH / R/ VR / 4 = 24v = RH sticker (we're provided little "flag" stickers to label the wires

RC / VC = 24v cool = RC sticker

Y / C / M / O = air conditioning compressor = Y / O sticker

W / H / B = heating = W / B sticker

G / F = fan = G sticker

Y1 = heat pump compressor = Y1 sticker.

 

[NYFelon]

G = green

RC = red

W/H/B = white

Y/C/M/O = blue.

only thing changed is the location of the blue wire.

 

[Indy_Guy_77]

Thanks everyone for the replies.

I don't know what it is about this, but it really has me addled. Part of it is that I've never done it before, and part of it is a little bit of dyslexia kicking in.



One would think that if I can detail strip & completely reassemble a Ruger 22/45, Ruger 10/22, and a Walther P22 that I could switch a thermostat. But Noooooooooooooo. sheesh.

-J-

 

[cosermann]

Indy_Guy, does your thermostat control your AC as well?

 

[cosermann]

In case you ever get back to this thread, here's what you need to do (assuming your current thermostat works fine).

1. IGNORE THE ACTUAL COLOR OF THE WIRE. Label the wire connected to each of the terminals on your existing thermostat based on the terminal to which it's connected. Disconnect one at a time and label one at a time appropriately. So, based on your picture each of your 4 wires will be labeled R, G, Y, and W respectively.
2. Remove your old thermo and mount the new one.
3. Take the R labeled wire and connect it to the RH terminal on the new thermo.
4. Take the G labeled wire and connect it to the G terminal on the new thermo.
5. Take the Y labeled wire and connect it to the Y/O terminal on the new thermo.
6. Take the W labeled wire and connect it to the W/B terminal on the new thermo.

There you go.

I've had a similar thermo for a few years. I think you'll like it once you get it figured out.

 

[furbymac]

Purchased a new programmable thermostat today to replace the 34-y.o. mercury switch round t-stat in our house.

And it seems that I'm electronics-dumb.

It's a typical 4-wire set up, but I'm having trouble translating the "old" wiring into the new device.

It doesn't help that I'd just as soon not ruin the HVAC, blow our house up, or poison the 3 of us with CO.

Attached are pictures of Old & new. I'm hoping someone can help me translate it!

Old:

Labels as follows if you can't see them. Clockwise from 12:00:

green wire = G
blue wire = Y
white wire = w
red wire = R
empty = O
empty = 4

New:

Also, what should I do with the old thermostat?

TIA,

-J-

g=g r=rc b=y/o w=w/b y1= second stage cooling