Maple Chase / Robert Shaw 9710 - http://www.hvacmechanic.com/ Forums
Original message
| gavinjd
 |  "Maple Chase / Robert Shaw 9710"
, posted Fri 7 Nov 14:51  
Hi,
I have a new Maple Chase 09710 thermostat. It has the following
terminals:
C, G, W3, W2, Y2, Y1, B, W1, O, Rh, Rc
I'm trying to replace a York Thermostat which is hooked up to the
following terminals:
W, B, G, R, X, O, Y
Can anyone help with what the new hookups should be?
Also, there may be a complicating factor in that the new thermostat
says it's for a 24V AC system. I have a York furnace and I opened up the panel and there is a 24v AC transformer inside so I think I'm ok.
Thanks for any help!
Gavin Davidson
|
|
Replies:
|
| Xenos
Webmaster 
| "Re(1):Maple Chase / Robert Shaw 9710" , posted Fri 7 Nov 17:19
Is this just an A/C ? I am assuming you are only using W, G, R and Y
W= w1
G=G
Y=Y1
R= Rc jumped to RH
X= Should be C the common wire, I recommend tracing this one to verify.
Xenos.
The best way to escape a problem is to solve it.
|
| | gavinjd
| "Re(2):Maple Chase / Robert Shaw 9710" , posted Fri 7 Nov 19:35:
HI,
No - it's heating and A/C.
There are wires going to W, B, G, R, X, O and Y right now.
Also, I just noticed that there is a jumper between Rc and Rh and bside it it says to remove the jumper for a transformer system. I know there is a transformer at the furnace - should I remove it?
Thnks
Gavin Davidson
[this message was edited by gavinjd on Fri 7 Nov 19:57] |
| | Xenos
Webmaster
| "Re(3):Maple Chase / Robert Shaw 9710" , posted Sat 8 Nov 06:33
I am confused about what O and B are being used for.
Everything should be wire to wire. W now being W1 and Y being Y1 the jumper is used in you case since it only removed in two transformer systems. The cooling transformer being Rc and the heating one being Rh.
This is not a heat pump right?
Xenos.
The best way to escape a problem is to solve it.
|
| | gavinjd
| "Re(4):Maple Chase / Robert Shaw 9710" , posted Sat 8 Nov 07:28
One other question.
The new thermostat says it needs to operate on a 24V AC system and I'm pretty sure I have that. I have a voltmeter here, should I check the wires to see which one carries the 24V? This might be a stupid question so feel free to ignore it!
Gav
Gavin Davidson
|
| | Xenos
Webmaster
| "Re(5):Maple Chase / Robert Shaw 9710" , posted Sat 8 Nov 07:57
Basically there are 4 thermostats, 240Vac,120Vac,24Vac and 750 Mv. The odds of your furnace being anything other than 24 VAC are slim to none. To assure your self R to X should produce 24Vac + or – a few.
Xenos.
The best way to escape a problem is to solve it.
|
| | gavinjd
| "Re(6):Maple Chase / Robert Shaw 9710" , posted Sat 8 Nov 09:42
OK,
So I tested all the terminals using X as the common and here's what I got:
W: 19V
B: 19V
G: 19V
R: 10V
O: 21V
Y: 19V
WHen I hooked this up before I the thermostat told me that there was insufficient power which I guess makes sense when there was only 10V. I was thinking of trying the wire that is currently going to O (21V) on the Rc instead?
THanks for your help so far.
Gavin Davidson
|
| | Xenos
Webmaster
| "Re(7):Maple Chase / Robert Shaw 9710" , posted Sat 8 Nov 10:07
X is not common then. Using R what voltages do you get on the wires?
Xenos.
The best way to escape a problem is to solve it.
|
| | gavinjd
| "Re(8):Maple Chase / Robert Shaw 9710" , posted Sat 8 Nov 10:28
OK, the plot thickens...
Using R as common I get 28V on all except X: 10V
In the meantime I did some more research and found some reference to York using B as common. So with B as common I get 0V on all except R: 28V and X: 18V
This help?
Gavin Davidson
|
| | gavinjd
| "Re(4):Maple Chase / Robert Shaw 9710" , posted Sat 8 Nov 07:24
No, it's not a heat pump. I have a HEIL Ultimate III FAG furnace.
Gav
Gavin Davidson
|
| | Xenos
Webmaster
| "Re(5):Maple Chase / Robert Shaw 9710" , posted Sat 8 Nov 07:32
Wiring will be as mentioned but for the life of me I have no idea why they would be using the B and O terminal.
Xenos.
The best way to escape a problem is to solve it.
|
| | Xenos
Webmaster
| "Re(6):Maple Chase / Robert Shaw 9710" , posted Sat 8 Nov 10:59
Obviously York uses B for common.
So here is what we know so far
W= W = Heating
B=C= Common
R=Rh+Rc= Power
G=G = Fan
Y=Y= Cooling
What is O and X ? Hmm where do theses wires go ?
Xenos.
The best way to escape a problem is to solve it.
|
| | gavinjd
| "Re(7):Maple Chase / Robert Shaw 9710" , posted Sat 8 Nov 12:06
Sorry - scrap that.
There are multiple wires at the terminals at the furnace which makes it hard to decipher!
Looks like they are all matched up accordingly.
Just got to figure out what the hell they do now.
:(
Gavin Davidson
|
| | gavinjd
| "Re(7):Maple Chase / Robert Shaw 9710" , posted Sat 8 Nov 11:44
At the furnace, both the orange and yellow wires (O and Y at the thermostat) are attached to the O terminal.
The same wire is attached to X at both.
Gavin Davidson
|
| | Xenos
Webmaster
| "Re(8):Maple Chase / Robert Shaw 9710" , posted Sat 8 Nov 12:25
what are all the terminals on the furnace?
Xenos.
The best way to escape a problem is to solve it.
|
| | gavinjd
| "Re(9):Maple Chase / Robert Shaw 9710" , posted Sat 8 Nov 12:55
So I put the noew thermostat on, and matched up all the terminal as you had suggested except the old B is now C. The only one left over was the old X which I matched to the new B.
On the furnace, there are:
R, B, Y, O, G and X. The White goes straight into the furnace which I guess makes sense s it's the heat - right?
The furnace is coming on and there is heat! TH only thing I noticed is the new thermostat has a Auc light on the front that came on which is apparently the second stage of the heat? This came on first and then went off after a few minutes.
Gavin Davidson
|
| | Xenos
Webmaster
| "Re(10):Maple Chase / Robert Shaw 9710" , posted Sat 8 Nov 13:05
I just wish I have a York diagram.
Xenos.
The best way to escape a problem is to solve it.
|
|
|
|  |
|
