Original message
| JCHINCK
|  "T874R TO RTH7500D"
, posted Sat 12 Mar 17:51  
I HAVE A YORK MULTISTAGE HEAT PUMP CONNECTED TO A HW T874R1046 THERMOSTAT W/ Q674L1272 SUB PLATE. I AM TRYING TO REPLACE WITH A RTH7500D HW. I HAVE THE FOLLOWING WIRE CONNECTIONS:
W, O, Y, B, G, R, X, AND H. I AM HAVING A PROBLEM TRYING TO CROSS REFERENCE. I AM GIVEN THE FOLLOWING CONNECTIONS WITH THE RTH7500: R, O/B, Y, G, C, L, E, AND AUX.
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Replies:
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| Xenos
Webmaster 
| "Re(1):T874R TO RTH7500D" , posted Sat 12 Mar 17:54
Were both B and O used?
Xenos.
The best way to escape a problem is to solve it.
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| | JCHINCK
| "Re(2):T874R TO RTH7500D" , posted Sat 12 Mar 17:59:
B AND O BOTH HAVE WIRES ATTACHED. NO JUMPERS. I HAVE A SCHEMATIC FROM HONEYWELL THAT SHOWS THE LETTERS TO THE POSSIBLE COMPONENTS.
[this message was edited by JCHINCK on Sat 12 Mar 18:08] |
| | Xenos
Webmaster
| "Re(3):T874R TO RTH7500D" , posted Sat 12 Mar 18:16
Since you are using both B and O the RTH7500 is not compatible as it can only use either B or O. I would trace the wires and make sure they are indead both being used. There is the possibility that B is common, however the honeywell diagram shows X as common.
Xenos.
The best way to escape a problem is to solve it.
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| | Houston204
| "Re(4):T874R TO RTH7500D" , posted Sun 4 Nov 01:26
The Q674 L1272 is a little different.
"Tip of the Day" Remember to remove power first.
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