Original message
| dbbiker50
 |  "fan running"
, posted Fri 2 Feb 13:09  
I have a rheem heat pump and need to change out the thermostat. This is a multi stage system. the air handler inside is a model
Rheem RHQA 1218 T the thermostat is a rheem RXMT-A72 .
The terminals and coresponding wires are as follows:
R=red wire
T=black wire
O=#FFFAF0 wire
G=green wire
Y=yellow wire
E=white wire
X=blue wire
U= none
W2=jumpered to E
L= brown wire
I bought a Honeywell RTH7400 and would like to know where the brown and black wires go.....I believe they are not used? I hooked the blue wire to C on the Honeywell. and have a jumper between aux and w2 and orange wire to O/B. Unit comes on and heats but seems to keep the fan running after reaching temperature in the room even after 20 mins. Something wrong?
Any help will be appreciated.
I checked the settings under 170 and had chosen 7 but read down farther and there is an option 9 which reads two stage heating and single stage cooling. I set it to 9 to try it and now the fan shuts off. Whats the dif between the two? By this I mean why would it work under option 9 but not 7 like it should?
7 Multi-stage heat pump: Heat pump with backup or auxiliary heating.
9 Conventional multi-stage system: 2 heat stages (wires on W and W2),1 cooling stage (wire on Y).
I have a heatpump with heat pack and emergency heat. Which is right? Should be option 7. Funny if you use the letters on the outside of back plate (which are for heat pump) i dont have wires on a w1 and w2 but if you read the inside letters I do? (which are for conventional system
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Replies:
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| rgoncalves
| "Same problem here" , posted Fri 2 Feb 18:12
hi mate. I am having the same problem as you with the same honeywell thermostat. I just posted after you did. If you hear something, please let me know. I also tried #7 and #9. Right now I am trying #2 (Single Stage Heat Pumpwith no back up or AUX heat). I am not sure what I have, single stage or whatever. My furnace unit is a Bryant model 517EN018075. Thanks and good luck.
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