Original message
| dbbiker50
 |  "Rheem"
, posted Thu 1 Feb 07:43:  
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. Something wrong?
Any help will be appreciated.
[this message was edited by dbbiker50 on Thu 1 Feb 23:16] |
| Replies:
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| dumtek
|  "Re(1):Rheem"
, posted Sun 3 Feb 17:55
i have similar problem same heat pump and thermostat is rth7000 but i had problem before of heat staying on and having trouble shutting off and its got up to 80 degrees ac works fine have the new honeywell wired
c blue wire
g green wire
y yellow wire
o/b orange
rc jumped to r when purchase
r red wire
aux white
e black
L open
and left brown unhooked because according to instructions needed contractor at this point again ac fine but heat system wont shut off even when turned off have to swith to cool then back and forth on fan from auto and on then turning off. i switch back to heat doesnt come on till needed
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| bama 101
| "Re(1):Rheem" , posted Thu 1 Feb 19:54
when you set up the thermostat in the setup menu what did you set option 170 too?
should be set to 7(seven)
option 180 set to 1(one)
Help is just a question away.
Safety is up to you....
....THINK........
....Safety........
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| | dbbiker50
| "Re(2):Rheem" , posted Thu 1 Feb 22:16
Hey bama.
I had the 170 option set to 7 and reread the options under 170 and then tried option 9 which is basicly the same as 7 but says two stage heating and one stage cooling. Now the unit operates correctly. whats the difference between the two options?
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| | dbbiker50
| "Re(3):Rheem" , posted Thu 1 Feb 22:53
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?
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? 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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| | dbbiker50
| "Re(4):Rheem" , posted Thu 1 Feb 23:11
Oh by the way I do have the fan set on auto........I know you have to respond to all kinds....I do have some knowledge on this..lol....thanks for the help
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