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Old 08-27-2009, 01:47 PM   #61
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Facts about thermostats


Quote:
Originally Posted by #CARRIERMAN View Post
Hi DIY,ers

Was hoping to see more visits on this topic, and even hoped for a few questions for mdshunk and myself. Hopefully the ones of you that visited got some insight, thats all that really matters.

I was going over some things with my techs, just thought I would add it in with this post. You will run into older thermostats, some of them used this nomenclature.

Old / New
V= R (24 volts hot)
4= RH (24 volts hot)
M= Y (24 volts outut Cool)
R= O (24 volts output Reversing valve)
F= G (24 volts output Blower)
Y= W2 (24 volt output Heat, heat pump only)
H= W (24 volts output Heat)
X= C (24 volts common or neutral) same rules apply as in previous post. Just a little more information, as before if you don't find it in a post. Please don't be afraid to ask.

Carrierman
Hi Carrierman,
I have a YORK electric furnace model N2AHD14A06C. No A/C.
My old Tstat has two wires.
I've got a Noma digital Tstat, Multifunctional, and it has the ability to manual switch the blower on or leave in auto mode.
My old Tstat had two wires of the multi wire harness connected.
I hope to connect the t-stat to the furnace via 'G' terminals at both ends. I'll use the green wire that isn't used.

My Question: at the furnace can I assume that the 'G' terminal would allow for 'stay on' electronic activation of the blower from the manual switch at the TStat?

My Noma booklet has confirmed the 'G' is for the blower for a 3-wire configuration. And I pulled open the furnace's electrical box at the terminal and see that the 'G' and 3 other terminal posts are connected internally, with the other posts empty. Terminal 66 is HOT white wire to Tstat RH, terminal R is the black wire to Tstat W. Terminal B is connected internally, but not to the wire harness.

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Old 08-27-2009, 02:05 PM   #62
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Facts about thermostats


Carrierman has not been seen for a long time (not by me anyway). NORMALLY you have R (hot) at the furnace board to R at the tstat. Which may have a jumper Rc/Rh. Then W to W and G to G. you must have 3 wires for the fan to work. Noma tstats are CR*P (cheap Chinese knockoffs, get what you pay for IMO) and I would return it and buy a decent Honeywell Focus or Vision Pro or you may be sorry.
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Old 08-27-2009, 03:30 PM   #63
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Facts about thermostats


Quote:
Originally Posted by yuri View Post
Carrierman has not been seen for a long time (not by me anyway). NORMALLY you have R (hot) at the furnace board to R at the tstat. Which may have a jumper Rc/Rh. Then W to W and G to G. you must have 3 wires for the fan to work. Noma tstats are CR*P (cheap Chinese knockoffs, get what you pay for IMO) and I would return it and buy a decent Honeywell Focus or Vision Pro or you may be sorry.
Thanks OldPro.
The only two wiring colors that were attached to the old Honeywell 3 terminal TStat had wire White to terminal 'R' and wire Black to terminal 'W'. The 'Y' terminal unused.
At the furnace board, wire white to terminal '66' which is jumpered with '60'.
Wire black to terminal 'R'.

Looking into the furnace box I have 4 terminals connected to the board:
66
B
R
G
The other terminals have nothing wired to their posts: O,W,X,Y and 55.

Using the box's ground as a return, I metered against the 66 and noted 'HOT'
and when I metered against 'R' got nothing.

One more note: the R seems to be connected directly with the 24V transformer.

I kept my old thermostat, and if it fails, I'll transfer back to the old.
My only concern is to blowing more than the transformer's fuse in the box. Like a relay... That's expensive, especially if I need to call in a tech.

As for a return. I bought it 2 years ago during the big sales. Just getting around to installing it. Doubtful I can return. At least there's a 4 yr warranty.

Thanks for the advice. I'll start shopping around for a better quality replacement.
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Old 08-27-2009, 04:04 PM   #64
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Facts about thermostats


Post a pic of the wiring terminals as you got me curious. Some of those terminals are for a heat pump use. Not sure if someone altered your wiring and I cannot find a manual online. If you can post a pic of the wiring diagram for the furnace that will help. 98% or more of the equipment manufacturers use a standard RWYG configuration. Not sure what York was thinking with yours. One of your terminals should be a C (common terminal). I will find you a pic of a standard Lennox and post it. In Canada are you? Noma is Can Tire's favorite. R (hot) goes directly to one side of the transformer and the other side usually a yellow colored wire goes to C (common) on the terminal strip for your 24 volt supply. York is famous for using all black wires with numbers (PIA horrible).
When energized by the tstat: W to C is heating (24 volts) Y to C is cooling and G to C is fan all 24 volts on the terminal strip. From the tstat:
R =red
W=white
G=green
Y=yellow/blue is standard industry color codes
http://tech.lennoxintl.com/PDFs/ES5.pdf
look at page 7 for a idea of how it "usually" is wired

Last edited by yuri; 08-27-2009 at 04:25 PM.
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Old 08-27-2009, 04:28 PM   #65
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Yuri,
Excellent info! Standard codes is exactly what I'm looking for. Thank you!
I have no qualms with using the right wiring colors. I'm the second owner at this house. Suspect it was the builder/contractor installer that wired. Used white/black throughout for all including the HRV (this is separate). I guess didn't believe in using colors from the harness (furnace to Tstat).
Pics will come this weekend when I burrow the camera...
CT is correct. Seems they buy lots of Chinese stuff. Even the Napoleon BBQ line they carry is from there.

I will try to post a diagram sooner. The inside of the furnace box is more challenging and a photo will be the easiest.
I've wired the TStat, (except for G), and will wait before powering the furnace again.

I'm in Ottawa,ON. Cool last night (+9C this morning). I'm sure you're getting that way too.
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Old 08-27-2009, 04:33 PM   #66
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Facts about thermostats


You can interchange (buddy did it) R and W and it will work but not if you try use G. R needs to be hot. Thought you had lots of "hot air" in Ottawa or is the "Baron of boring running out"?

Last edited by yuri; 08-28-2009 at 01:47 PM.
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Old 08-31-2009, 11:06 AM   #67
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Facts about thermostats


Quote:
Originally Posted by yuri View Post
Post a pic of the wiring terminals as you got me curious. Some of those terminals are for a heat pump use. Not sure if someone altered your wiring and I cannot find a manual online. If you can post a pic of the wiring diagram for the furnace that will help. 98% or more of the equipment manufacturers use a standard RWYG configuration. Not sure what York was thinking with yours. One of your terminals should be a C (common terminal). I will find you a pic of a standard Lennox and post it. In Canada are you? Noma is Can Tire's favorite. R (hot) goes directly to one side of the transformer and the other side usually a yellow colored wire goes to C (common) on the terminal strip for your 24 volt supply. York is famous for using all black wires with numbers (PIA horrible).
When energized by the tstat: W to C is heating (24 volts) Y to C is cooling and G to C is fan all 24 volts on the terminal strip. From the tstat:
R =red
W=white
G=green
Y=yellow/blue is standard industry color codes
http://tech.lennoxintl.com/PDFs/ES5.pdf
look at page 7 for a idea of how it "usually" is wired
Here is diagrams (Visio) and chart that will be helpful.
for pics, I can't get them up here. I can email the 7M zip file to you if you'd like.
Attached Files
File Type: pdf Visio-YORK furnace box wiring.pdf (21.7 KB, 107 views)
File Type: pdf Thermostat + Furnace Terminal chart.pdf (9.9 KB, 127 views)
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Old 08-31-2009, 09:00 PM   #68
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Post the pics at Imageshack or Photobucket and put the links here. First diagram is missing info and unusual. Usually the fuse is between R and the transformer. Looks like they put it in the C side of the transformer which they call B. York is strange.

Looks like 60 and 66 feed your sequencers for heating, normal.
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Old 09-01-2009, 07:58 AM   #69
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Facts about thermostats


Hi Yuri,

<grumble> sometimes I loose everything I've typed in under quick reply due to a time-out.... So Here I go again. This time I'll copy into my clipboard BEFORE clicking 'post quick reply'.

I've posted the pics here: http://s747.photobucket.com/albums/x...Furnace%20box/

Please let me know by referencing a pic# if you need further more focused pictures inside the box. You should be able to zoom in on the pictures to see more detail...

I won't make changes to anything in the box as I'm not a trained technician. The wiring harness to the TStat could be modified, however, before doing this, I'd like to simply transpose the current wires to the new TStat. By connecting 66 to new TStat's RH, this should work for a two wire setup. The R would go to new TStat's W (according to TStat's diagram which indicates it as used for heating relay).

What I'm trying to add is a remote switch for blower from the new TStat, (New TStat's diagram indicates using its G 'Fan Relay').
So, which terminal at the box would permit this? Or do I have to go directly to the blower wires such as the blue wire which isn't connected to anything (see #YORK_5)

I appreciate all of your help thus far. It's great to have people such as you on this great site helping the general public, who wish to learn / save money and get satisfaction of 'doing it yourself'.
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Old 09-01-2009, 05:45 PM   #70
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Facts about thermostats


Carrierman,

Can you look at my post and help me?

Need HELP swapping a Vision pro 8320u1008 to an IAQ one


Thanks,
Tony
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Old 09-01-2009, 06:07 PM   #71
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His last post was in January/09. May not be back soon.
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Old 09-01-2009, 06:23 PM   #72
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Jimbo I hate to say this but somebody altered the wiring in your furnace. Those red wires are not from York and neither is that brown relay. Somebody added a toggle switch to the side of the furnace (for fan use?). I am wondering if the HRV is interlocked with the furnace. Without actually being there to do the job I cannot give you any SAFE advice that I would be comfortable with. I have some other Ontario posters/ folks who would like to see me if you all want to pay my airfare. LOL

York is very strange and does not use conventional wiring protocol. If you know of a HVAC tech who does work on the side perhaps he can sort it out for you. If we start changing wiring damage can occur. The elements and sequencers should be checked annually so paying for a tech is not a bad idea anyway.
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Old 09-01-2009, 10:33 PM   #73
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Thanks for your help, and appreciate the candidness.
HRV is completely separate. It has it's own humistat on a different set of wiring. (Two wires, not part of the harness). My basement ceiling isn't finished, so I can follow and ascertain the wiring there.
Service is expensive here in Ontario, (compared to Montreal, where I was originally from). Mind you, it doesn't help when you live outside the city prime, and the extra mileage they need to drive costs more.
Generally I wait for something to break before calling in someone. I have a secondary heating source just in case.
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Old 09-20-2009, 11:23 AM   #74
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Facts about thermostats


Anyone know if a 3 wire multi zone (only replacing 2 zones) can be replaced with any thermostat? I have a gas boiler hot water baseboard system. The wires are red, white and blue, but every thermostat I buy has 4-5 connections possible and nothing in the instructions about if you only have 3 wires.

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