The 13 SEER Rheem heat pump is a single stage HP, so the IAQ can't tell it to run at a lower stage.
The IAQ can slow the blower.

With the Mod stat, you can use a humidistat to slow the blower also.

As much of a fan of the IAQ as I am, I would hate to see a mod furnace crippled.

 

Twilli says get the mod and move on....you'll be happy

 

First, which Rheem Heat Pump will give me a two stage scroll compressor? And, is there a reason not to get that one? Huge cost difference?

Second, is there a Rheem 80%, with the ECM variable speed motor, that would have the "dilution air" so that I do not need the chimney liner. Whatever the inefficiencies of the current furnace - large - I'm only using 90 mcf a year now, including water heater. Absolute best efficiency is not my greatest concern. I'm replacing a 30 yr old Sears A/C and a Sunbeam gas furnace that is probably 40 yrs old - cracked firebox. 50 yr old house with lots of leaks but energy costs are still not too bad.

And Twilli, hope the truck payment got sent in on time. Don't forget to send in the funds for the 33.50 X 16 crome wheels and tires. I hope there is a little left over for Adult Beverages and some charcoal to cook the possums for the family get together at the burying ground.

Thanks

 

Not that I know of. Twilli would know better.
Its the 16 SEER Ultra series is the 2 stage.

 

If'n it were me, I would use the mod stat, and configure the cooling for multistage and wire Y2 into the ODD terminal and configure the furnace for ODD, that way you would have humidity removal, and if needed the additional sensible.

If you cant keep your humidity in check with that set up, you got significant issues including oversized equipement. The 13 SEER unit has like a .70 sensible ratio to begin with.

 

Finally going in.

Furnace and HP install was to be today, Wednesday. Going to begin on Thursday. The contractor told me that this is the first Rheem Mod Furnace and the first Mod Thermostst that his distributor has sold.

docholiday,

Can you tell me what ODD means and what is "sensible"?
I have had this fellow take care of the few HVAC problems I've had for the last 20 yrs. This project is a bit different from his normal install or replace job. I would like to get all the benefits from the fairly system capabilities so may have a few more questions about setting up the controls.

thanks

 

Furnace and HP install was to be today, Wednesday. Going to begin on Thursday. The contractor told me that this is the first Rheem Mod Furnace and the first Mod Thermostst that his distributor has sold.

docholiday,

Can you tell me what ODD means and what is "sensible"?
I have had this fellow take care of the few HVAC problems I've had for the last 20 yrs. This project is a bit different from his normal install or replace job. I would like to get all the benefits from the fairly system capabilities so may have a few more questions about setting up the controls.

thanks

ODD = On demand dehumidification

Sensible refers to heat which causes a change of temperature, i.e., you can feel it.

Latent (in case you're interested) refers to heat required to change the state of matter. Example: ice at 32 degrees requires x amount of calories per gram to change state (melt) to water at 32 degrees (heat of fusion). Also, water at 212 degrees requires x calories per gram to change to vapor (boil) at 212 degrees (heat of vaporization). Also works in reverse--water vapor in air (in household air) condenses on your a/c evaporator coil as the heat of vaporization is removed (absorbed) by the boiling of liquid refrigerant.

Gee, I just rattled that off of the top of my head--haven't used that since high school. Hope I didn't make a mistake.

AM

 

Can you tell me what ODD means and what is "sensible"?



Twilli use in a sentence:

Don't you think its odd how much Mary's baby looks like Twilli and nothing like Bob her husband, the sensible thing to do about it is keep your mouth shut if you know whats good for you.

 

ROFLMAO

 

Thats Twilli's baby's momma

 

Twilli,
You must really stamp them good. That must be the reason for your reputation as the installer of renown.

My experience is that it is ODD if there is any apperance difference based upon the sire of the offspring from ditch hogs. I thought it was sensible to consider them in the same way as labradors or rottweilers. Whatever champion fence jumper gets the job done does not matter - the puppies all look the same as the momma.