Programing Honeywell Vision PRO 8000?

[clopay]

Model is TH832OU1008. I believe what the current program is if the room temp is -2 degrees below the set room temp the EMER heat strips kick in to bring up heat up quickly. Can this be changed? How? Can this be set to say 10 degrees difference between room temp & set temp before EMER heat strips kick in with this thermostat? ( Rheem PRQL-024JEZ W/ RHLL-HM2417JA)

[BaldLoonie]

Can't do that. Add an outdoor sensor and lock off strips in milder weather.

[beenthere]

Wow. I sure wouldn't want my place to drop from 70 to 60 before my aux heat came on. That isn't comfortable.

[SBKold]

FYI..... call them heat strips or AUX heaters

EMER heat is another setting that turns off the heat pump and heats with only strips.

BaldLoonie gave a great suggestion. The only problem is...a few degrees below 40 (outdoor) and it allows the strips again. You cant select a colder setting than 40 with your thermostat. But you will still benefit from the sensor...its just I was disapointed that it only went to 40.

[beenthere]

FYI..... call them heat strips or AUX heaters

EMER heat is another setting that turns off the heat pump and heats with only strips.

BaldLoonie gave a great suggestion. The only problem is...a few degrees below 40 (outdoor) and it allows the strips again. You cant select a colder setting than 40 with your thermostat. But you will still benefit from the sensor...its just I was disapointed that it only went to 40.

Get an IAQ thermostat and you can set it as low as 5°F.

[SBKold]

I knew it got lower but all the way to 5? that isnt the comp lockout is it?
I figure the OP wouldnt want to change to a IAQ anyway....

[beenthere]

I knew it got lower but all the way to 5? that isnt the comp lockout is it?
I figure the OP wouldnt want to change to a IAQ anyway....

Thats aux lock out.

[SBKold]

Impressive.....I know we differ on quite how cold a HP will still perform....just curious...whats your recommended lockout temp? Since it rarely gets much below freezing here i set up older 10 seers to 40 and newer units to 35. I know you have to take customers comfort in mind...but im sure you have a recommendation thats a good balance of comfort/economy.

[beenthere]

5° before thermal balance point.

If thermal balance point is 30, then aux lock out should be set to 35.

[SBKold]

How do you know the balance point of every matchup? Is there a formula?

[beenthere]

You need the spec/tech guide for the unit. And the load calc of the house.

Then do a plot on graph paper.

If your installing a new thermostat for a customer. And you didn't put the system in.
Then you have to guess. or do a load calc(never meet a customer that would pay for a load calc, just to have a thermostat set up right).

How good your are at guessing determines if you get a call back for not enough heat later.
And if it saves them a lot of money.

[SBKold]

Ok I think I understand...Basically we compare the Btu/hr of the HP at a OD temp
then compare how much the home is letting in

Balance point is where two lines intersect?

[beenthere]

Ok I think I understand...Basically we compare the Btu/hr of the HP at a OD temp
then compare how much the home is letting in

Balance point is where two lines intersect?


Yes, thats it.

And the graph is just done on a paper like this:

[SBKold]

Thank you

[clopay]

Yes "Aux Lock Out", that would work for me. I don't think this thermo has this feature.

[beenthere]

The TH8320 does indeed have aux lock out ability. Its limited to a low of 40°F though.

And it must have an outdoor sensor installed.

[clopay]

You would think that (1) of the wires into the thero could be routed into a simple "on" - "off" switch. That would control is you want the heat strips to function or not. Has anyone ever done this?

[openclasspro]

pick option 3 on # 680 on installer setup

[beenthere]

You would think that (1) of the wires into the thero could be routed into a simple "on" - "off" switch. That would control is you want the heat strips to function or not. Has anyone ever done this?

So that if you go a way and the heat pump fails. And you have the switch off because you have them temp set low.
Your water pipes can freeze and burst???

[clopay]

OPENCLASSPRO: Are you saying if I change function #680 to #3, this will keep the heat strips from coming on until I change it back to #1? (BTY, I have ceiling cable electric heat for backup that I always keep at 60 degrees)

[openclasspro]

it's the aggressiveness of your recovery of your temperature control-staging control to a degree

[clopay]

In reading the Installation Guide, it looks as if you select option #170, #2 instead of #1 would work also to kill heat strips. Your thoughts OPENCLASSPRO?

[openclasspro]

In reading the Installation Guide, it looks as if you select option #170, #2 instead of #1 would work also to kill heat strips. Your thoughts OPENCLASSPRO?

that would be a heatpump w/o b/u resistant heat-so yes, it wouldn't recognize it and turn it on

[DavidPJ]

that would be a heatpump w/o b/u resistant heat-so yes, it wouldn't recognize it and turn it on

That's how I have my VisionPro 8000s set up and it works fine. These are for infrequently used rooms so comfort is not an issue. If outside temps get back into the teen I'll re-enable the strips.

[clopay]

DavidPJ: So the setting you use is Function 170, Option #2 to kill heat strips? I'm only going to use this as we get into a little warmer weather. Like I said, I have ceiling cable electric backup that I keep at 60 degrees. I would think using this option would be great if you don't mind waiting a little while from the house to warm up.

[DavidPJ]

DavidPJ: So the setting you use is Function 170, Option #2 to kill heat strips? I'm only going to use this as we get into a little warmer weather. Like I said, I have ceiling cable electrice backup that I keep at 60 degrees. I would think using this option would be great if you don't mind waiting a little while from the house to warm up.

Setting 2 is the setting I used for my system (single stage heat pump (no aux heat) to disable the strips. The normal setting on my VisionPro 8000 is number 7, which is 2 heat/1 cool heat pump (with aux heat).

[clopay]

Sounds good!! I'll try tonight and reply with my results.

[clopay]

OK, I set Function "170" from #7 to #2. Turned on heat pump. The heat strips did NOT fire just as I expected. Inside temp was 61 degrees, outside temp 25 degrees. The system ran for an hour and inside temp was up a whole 2 degrees (63). I like the function, but only plan on using March, April, October, November here in Ohio. Thanks to all who responded.