Thermostatic Controls - Please help verify if Honeywell TH8000 is set-up correctly?

Hi,

I had a new RHEEM (model# RGRM-10EZAJS) furnance installed recently along with a new Honeywell TH8320 T-stat. This is a 2-stage 95% furnace per the dealer.

During the recent cold spell I noticed the new furnace was running a multiple short cycles rather than a long cycle like my old Amana 2 stage furnace did. After reading some of the old posts here, I decided to check the settings on the t-stat.

Current setting for a few key codes (per my understanding of the manual) are as follows:

170 - 1
220 - 3
230 - N/A. Option skips from 220 to 240. Should this option be available for a 2-stage furnace?
240 - 5 (Based on old posts here and installation guide for 90%+ efficiency, I guess I should change it to 3)
250- again not available as an option.

Please let me know if this settings are correct and/or need more additional information from me to set the T-stat correctly.

Also, are there any other codes that I should verify and/or change based on the information given above. I did not list all of them as they were related to dates, light, DST fans, etc.

Thanks.

Option 170 should be 9 (2heat 1 cool conventional).

It is possible that they did not have enough cunductors to allow for this option.

Do you have a wire on the stat W2 terminal?

The furnace would also probably require reconfiguration of the jumper settings to allow for 2 speed control. I can't get Rheem manuals though.


Post the make and model of your outdoor unit unless you are sure that it is a single speed condenser.

Do you have a wire on the stat W2 terminal?

Yes.


Post the make and model of your outdoor unit unless you are sure that it is a single speed condenser.[/QUOTE]

I'll have to get back to you on this as the outdoor unit is more than 20 years old and only thing visible is "Rheem High Efficiency" otherwise mother nature has wiped clean the model/serial # information display plate. I opened cover on the unit to see if there was information label inside and the only thing inside was wiring diagram and manufacture date of 1983. Did they make 2 stage a/c back then?

The dealer who installed my furnace is an authorized dealer for Rheem and he knew exactly what model it was, since he also replaced the indoor condensing coil for this ac unit. I'll call him over the weekdays and try to get that information from him. If there is any other way that I can get this information, let me know.

Thanks.

the outdoor unit is more than 20 years old and only thing visible is "Rheem High Efficiency" otherwise mother nature has wiped clean the model/serial # information display plate.

Chances are it's a single stage for that old of a unit.

Then 170 needs to be set to 9
Then i suggest setting 240 to 2, 250 to 3.

105k furnace, must be a large home?

, since he also replaced the indoor coil for this ac unit.
With the A/C that old, why didn't you do the outdoor unit? You'll get a better SEER rating.


Make sure the W2 is wired up on the furnace, and jumper P7 needs to be set up to "NONE"

Option 170 = 7? Pretty sure you meant 9.



http://i151.photobucket.com/albums/s160/Houston204/Visionproconfig.jpg

Option 170 = 7? Pretty sure you meant 9.

Thanks for catching that. My mind was on HP mode!

Make sure the W2 is wired up on the furnace, and jumper P7 needs to be set up to "NONE"


Thank you guys for the quick response. I 'll check the W2 connection on the furnace and look for Jumper P7. Out of curiosity and complete ignorance what does the jumper P7 do?

Jay - We decided to not replace the outdoor a/c unit mostly based on our cost benefit analysis. Over the past 4 summers that we have been in this location, we probably have not used the a/c more than 12 - 20 times per summer. Therefore even if the newer units are 50% more efficient then my existing one, the savings in electric cost would be very minimal for our usage. The unit has been serviced regularly by the previous owners and myself...so hoping it keeps going for a while and replace it when it dies.

Regards.

Out of curiosity and complete ignorance what does the jumper P7 do?

The jumper is just telling the board if there is a two stage stat or not. Otherwise, if I recall (don't have it front of me) that the jumper is also a time delay for 2nd stage. (none-5-10)

You are correct I looked at my instruction manual and for two stage T-stat the option is set to "None" (default) and other options are 5 minutes and 12 minutes delay.

Thanks again for all your help.

Regards.