We have a tempstar 10 heat pump model nhp024aka1 that came with out house the old t sta was a robertshaw 9520 and the other day it went out so I got a honeywellrth5100b to replace it. I did as it stated and played with the programing alot to see if i could MAKE it work, since it seemed as if ti was wired as a multistage. So this morning I took the panel off the tempstar to see for myself where the wires went and this is what i found.


r-rv=reversing valve= nohting
r=24vac=red wire
c=common=blue wire
o=heat/cool=orange wire
y=compressor=yellow wire
w=defrost heat=white wire


the problem is on the old stat (robertshaw 9520) the wiring was:
r=24vac=red wire
c=common=blue wire
y1=stage1cooling/heating=yellow
o=reversing valve cool=orange
g=fan relay=green= of note the green wire was not connected to the heat pump AT ALL!!!
w2=2nd stage heat=white

as you can see these don't make alot of sense to me anyway. and the new stat (honeywell 5100b) I tried to just do heat pump to new stat connections since the old stat had some crazy and misleading wiring but my problem is 1) I can't find anywhere that has a diagram for the honeywell I can figure out that R is 24vac and ob/w is reversing valve but what is the Y and the G?? I am at a lost for what wire goes where......


We have been fortunate enough that the weatheer has only got down to mid 40s at night the last couple of nights but next weekend it is going ot be a high of 40s so I would love ot ge tthis rewired ASAP.


thank you in advance for your help

 

Try this

http://customer.honeywell.com/Techlit/pdf/69-0000s/69-1716.pdf

G doesn't need to go outside to the heat pump-just to the air handler cause all it does is run the indoor fan.

Y pulls the contactor in outside to run the compressor in both heat (1st stage) and cool

The orange wire energizes the reversing valve in cooling mode. It looks like you want that on o/b w and you configure the new t'stat for whether you energize the rev valve in heat or cool for your outdoor unit.

It would be easier to get someone who wires heat pumps all the time to look at it firsthand, probably.

 

OK so I wired it up:

RC jumped to R
R=red wire=24vac on Heat Pump(HP)
Y=Yellow wire=compressor on HP
W=orange= heat/cool on HP
G=green=indoor fan?


still not working

 

First off here why do you say it was the tstat???? Did you jump any the wires in the tstat and everthing worked ok?????
If you jump R to G do you get inside fan ????

 

I think it is the T stat becuase when I came home it had no power going to it ( it is digital) and then the next day it worked for like 3minutes, can I jump the green fan with the Red 24vac and start the indoor fan?

edit I jumped red to green and nothign happened hmm maybe i got a bad breaker, hmm breakers are fine, now I am starting to worry that my 4year old heat pump has died

 

On the old tstat you show R and C do you get 24V from them???? with a meter???

 

hmm no juice from any of the wires

 

Check transformer ,is there a small fuse for it there?????
all fuse are breakers good

 

I have a no contact volt meter and it detects current at the transformer outside and the thick line going to the heat pump, but not the line that is leaving the heat pump the line that has all the wiring for the t stat.

 

thanks for all the advice and help, called a service guy and $150 later it was a blow circuit in the air handler. it was bad blow too