thermostat wiring

[tonyou812]

Is there a standard color code that Hvac people use in their refrigiration control wiring?

[Dennis Alwon]

Check this out (http://xtronics.com/reference/thermostat_wires.html)

[tonyou812]

Nice! weres that site been all my life? Molto Grazi Seniore,

[masterinbama]

the only add I have is a heat pump will use the orange also for the reversing valve

[splinetto]

I had a guy tell me " When you see a green light it means go go go , just like the fan motor and if something is white it must be white hot, so the white is for the furnace because that gets hot....He had all the other colors covered but cant remember,,,

[mdshunk]

Here's a better one, courtesy of my buddy Scott, with some more manufacturer specific color codes.

http://www.toad.net/~jsmeenen/wiring.html (http://www.toad.net/%7Ejsmeenen/wiring.html)

[electricalperson]

the thermostats i wire uses this color code

R = power
W = heat
G = fan
Y = AC

RH is for heat
RC is 24v volts from air conditioner if heat and ac are two seperate systems

[480sparky]

the thermostats i wire uses this color code....
I don't do stats. That's the tinners job.

[peter d]

I don't do stats. That's the tinners job.

Sometimes we do, sometimes we don't. All depends on the "tinner." Usually they do ALL of the electrical work around here. :roll:

[mdshunk]

I don't do stats. That's the tinners job.Those sheet metal thermostats run on airflow?

[480sparky]

Those sheet metal thermostats run on airflow?

I'm saying in my entire career as an electrician, I have never installed or wired a stat. Simple as that.

I replaced my old Honeywell dial with a programmable. But that was in my own home, and I wasn't gettin' paid to do it, so it don't count. ;)

[mdshunk]

I'm saying in my entire career as an electrician, I have never installed or wired a stat. Simple as that.Then why didn't you say that in the first place? :grin:

[electricalperson]

in my area we always install the thermostats and wire the heating/ac system

all the plumber does is come in and plumb it and we need to figure out what he did most of the time. its not too hard to do if you understand how the system is supposed to work. we can usually ask the plumber or heat guy questions if we need too

[Sparky555]

The only time I had to do thermostat wiring was when a tin-bender was union. I told him it was fine with me after he showed me where to terminate the wires in the furnace. The goofy part was I knew he had more stat wire in his truck than I had in mine.

Dave

[quogueelectric]

I love doing tstat wires 99 bucks apiece. You can get in a lot of trouble with these if you dont understand the systems though. With both ac and heating split 1st floor 2nd floor basement then add heating cooling programable tstats I see more people screw these up than I care to count. I charge 50 to wire the tstats and there are usually at least 2 per house.

[LarryFine]

I love doing tstat wires 99 bucks apiece.Is that $99 per wire, as in per conductor? :-?

I've been wiring 'stats longer than I can remember. I helped my dad install a whole-house humidifier when I was a kid.

2-conductor LV wire is red and white (as in doorbell wire, too), 3 cond. is red/white/green, etc. That's how it evolved.

[quogueelectric]

Is that $99 per wire, as in per conductor? :-?

I've been wiring 'stats longer than I can remember. I helped my dad install a whole-house humidifier when I was a kid.

2-conductor LV wire is red and white (as in doorbell wire, too), 3 cond. is red/white/green, etc. That's how it evolved.
Standard 5 conductor is my favorite. The ac guys usually include thier 2 conductor to the condensing unit god bless them.

[quogueelectric]

Check this out (http://xtronics.com/reference/thermostat_wires.html)
Anyone who is interested in learning something good here pay close attention to the basic color code Thanks to Dennis you will call on this basic drawing for the rest of your career and will find that 90% of other electricians dont know this simple diagram. This is one of the best ones I have ever seen and I have bailed out dozens of so called electricians who have smoked control transformers in rooftop units. Marcs was good too btw.

[LarryFine]

We usually get asked to run 7- or 8-cond. for HVAC systems, to both the indoor and outdoor units.

[quogueelectric]

We usually get asked to run 7- or 8-cond. for HVAC systems, to both the indoor and outdoor units.
There are little to no heat pumps up north that would require the extra conductors I hear they are only efficient to 55 degrees. I can still remember the oil lines freezing at -10 f when I had a newborn in the house and was under the oil tank with an acetylene torch dfrosting it for a half hour then it would freeze up again. Had to send the wife to the mother in laws at 3 am not fun.

[Rampage_Rick]

Is that $99 per wire, as in per conductor? :-?

I've been wiring 'stats longer than I can remember. I helped my dad install a whole-house humidifier when I was a kid.

2-conductor LV wire is red and white (as in doorbell wire, too), 3 cond. is red/white/green, etc. That's how it evolved.Pulp-insulated phone cable started the same way. Can you imagine staring at 300 pairs of red and white wires? Later on they amended it, so you'd have 100 pairs of red/white, 100 pairs of green/white, and 100 pairs of blue/white.

[iwire]

Anyone who is interested in learning something good here pay close attention to the basic color code Thanks to Dennis you will call on this basic drawing for the rest of your career and will find that 90% of other electricians dont know this simple diagram. This is one of the best ones I have ever seen and I have bailed out dozens of so called electricians who have smoked control transformers in rooftop units. Marcs was good too btw.

Unfortunately it seems on the commercial units 'R, W, Y, G' etc has been pretty much abandon.

Either it will be some proprietary set of connections that you better have instructions for or the unit will be connected with just a network cable, Cat 5 or two conductor twisted shielded.

[electricalperson]

Unfortunately it seems on the commercial units 'R, W, Y, G' etc has been pretty much abandon.

Either it will be some proprietary set of connections that you better have instructions for or the unit will be connected with just a network cable, Cat 5 or two conductor twisted shielded.
most units i do in commercial use the standard color code i rarely do the shielded or cat 5 system. the contractor that we work with mostly uses the same system for commercial and residential. sometimes the compressor is 3 phase