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laynerd · Dec 11, 2009, 11:35 AM

I now have a Carrier heat pump with electric back-up heat . I want to replace the manual stat with a Honeywell visionpro 8000. The terminals connected on the old stat are:
O/W2
R
Y/Y2
G
C
W/W1

Can you tell me how to connect the Visionpro 8000 Model No. TH832OU1008?
Terminals are:

W-O/B
G
R
Rc
C
Y
Y2
L
E
Aux-W2

tkrussell · Dec 12, 2009, 04:48 AM

Moved to HVAC

laynerd · Dec 12, 2009, 07:34 PM

Thank you.

KISS · Dec 12, 2009, 07:43 PM

Can you tell me how to connect the Visionpro 8000 Model No. TH832OU1008?
Terminals are:

Code:

W-O/ B      O/W2   
G               G
R               R
Rc              R
C               (not used, but ciould use if extra wire available)
Y               Y/Y2
Y2             NC - No connection
L               NC - No connection
E               W/W1*
Aux-W2     W/W1*

* I'll have to verify that after looking at the instructions.

Are you comfortable configuring the tstat?

KISS · Dec 12, 2009, 09:20 PM

Yep, you want the configuration: 2H/1C Heat Pump (with auxiliary heat) on page 5 of the install guide.

laynerd · Dec 13, 2009, 07:53 PM

Originally Posted by KeepItSimpleStupid

Can you tell me how to connect the Visionpro 8000 Model No. TH832OU1008?
Terminals are:

Code:

W-O/ B      O/W2   
G               G
R               R
Rc              R
C               (not used, but ciould use if extra wire available)
Y               Y/Y2
Y2             NC - No connection
L               NC - No connection
E               W/W1*
Aux-W2     W/W1*

* I'll have to verify that after looking at the instructions.

Are you comfortable configuring the tstat?

Thank you. I would have wired it wrong had I not gotten instructions from an expert like you. I would appreciate your verifying the W/W1 connection.

I am now not sure about configuring it either in some cases. It would be a great help if you can give me the setup functions.

Thanks again.

KISS · Dec 13, 2009, 09:39 PM

The instructions say to jump E and Aux.

0170 =7
0250 =9
0380 = 1 (suggestion)
0650, 0660 =90 (suggestion)

Also set the filter reminder.

Go through the system test sequence.
I'm assuming default values for everything else. You can muck with time date etc.

Since this is a heat pump, you might consider installing an outdoor sensor. With that you can modify when aux heat is used. In essence when aux and HP is appropriate and when aux alone is appropriate (340, 350 and 360)

Check out Furnace Filters, Air Conditioner Filters, Air Quality - iaqsource for a sensor and even manuals. There arranged very nicely on their website.

So you have an extra wire available for common?

laynerd · Dec 14, 2009, 08:16 AM

I have 6 wires; the blue is now connected to common. If I understand your directions as well as Page 5 of the installation instructions, I should connect the blue to C; Rc and R are jumpered and E and Aux are also jumpered (using all 6 wires again).

Note 8 of the instructions say to Jumper E and Aux "if there is not emergency heat relay". Can you know by the 6 wires of my current Carrier unit and what I have told you about my heat pump that I do not have an emergency heat relay? I thought the electric strip heat was emergency heat or also called auxiliary heat.

You are a great help!! 1

KISS · Dec 14, 2009, 08:39 AM

Emergency heat relay: Need model numbers. And only if I can find data online.

This is what one does: http://johnstonesupply9.com/TechDocs...O%20Manual.pdf

It basically tells the system to just use emergency heat below a certain temperature.

That''s why it's nice to use an outdoor sensor to tailor the switching points.

You don't have complete information to set the switching points because eyou need to know the heat loss of the building. At some outdoor temperature the heatpump output is the same as the energy losses, That's one point.

At another, the heat pump doesn't work very well and basically should be turned off.

These decisions can occur in the outside unit, otherwise you have to make them.

Did you ever notice that only the strips were on? This would be an indication that an emergency heat relay exists. You don't have an E terminal on the old stat, so I doubt it.

laynerd · Dec 14, 2009, 02:54 PM

The model no. of the Carrier, Weathermaker Heat Pump is 38YKC. It is a Carrier, Comfort 10.

I just moved the current Carrier Thermostat mode from Auto to Heat. I then set it to 85 degrees F. The results was that the heat came on hotter than usual. The thermostat read ;Aux Ht. and the outside unit did not cut on. I did it a second time with the same results.

I have never noticed the thermostat ever reading Aux Ht. before the aforementioned test.

So, based on the above actions, do you thing I have an emergency heat relay?

Thanks again.

KISS · Dec 14, 2009, 03:28 PM

Nope. The wiring diagram jumps them all.

Because you requested a very large difference in temperature than the setpoint, the thermostat kicked in the emergency heat.

A heat pump CANNOT change the temperature quickly, therefore emergency heat comes on. Honeywell doesn't give out it's algorithms, but a large temp difference or the inability of the temperature to rising after a certain amount of time is reasons to kick on the emergency heat.

It's also a general reason why setback doesn't work well with heatpumps. They can't recover.

You really don't want the emergency/aux heat to come on.

It looks like you may have an "L" terminal, which tells you that the Emergency heat is active"

Is there a model # for the inside unit?

KISS · Dec 15, 2009, 10:29 AM

I hope you are enjoying your new tstat. Honeywell considers this a professional product and therefore is reluctant to provide help.

So far, I still think the "L light (tells you when them heat) is on and installing an outdoor sensor would be a worthwhile option for you.

Hopefully, if you use the setback option, Honeywell's algorithm will turn the heatpump on early enough, so backup heat doesn't have to be used.

Remember that a large setpoint/room temp difference is likely to cause emergency heat to come on.

So would something like, the HP ran for 15 minutes and the temperature inside didn't change.

I have no idea what that algorithm is.

Some stats also use past operating history to determine when to use emergency heat.

Enjoy!

laynerd · Dec 20, 2009, 04:44 PM

Originally Posted by KeepItSimpleStupid

I hope you are enjoying your new tstat. Honeywell considers this a professional product and therefore is reluctant to provide help.

So far, I still think the "L light (tells you when em heat) is on and and installing an outdoor sensor would be a worthwhile option for you.

Hopefully, if you use the setback option, Honeywell's algorithm will turn the heatpump on early enough, so backup heat doesn't have to be used.

Remember that a large setpoint/room temp difference is likely to cause emergency heat to come on.

So would something like, the HP ran for 15 minutes and the temperature inside didn't change.

I have no idea what that algorithm is.

Some stats also use past operating history to determine when to use emergency heat.

Enjoy!

Thanks again:::

I cannot locate the model number of the air handler because it is in a crawl space only tall enough for a slim, short indian to get to. For right now, I will take the advice of a professional and assume there is no emegency heat relay. Therefore, I will install a jumper between E and Aux terminals of the new thermostat. I will get back to you after I install it in a few days. I would have already done it but I have been shoveling 12 inches of wet snow in Central Virginia (Forest). Again, I sincerely appreciate the help of an experienced professional like yourself.

KISS · Dec 20, 2009, 05:30 PM

Had 15" of dry snow and the snow blower was buried. I was able to use the leaf blower for a while. I emphathize.

laynerd · Dec 29, 2009, 06:46 PM

Originally Posted by laynerd

The model no. of the Carrier, Weathermaker Heat Pump is 38YKC. It is a Carrier, Comfort 10.

I just moved the current Carrier Thermostat mode from Auto to Heat. I then set it to 85 degrees F. The results was that the heat came on hotter than usual. The thermostat read ;Aux Ht. and the outside unit did not cut on. I did it a second time with the same results.

I have never noticed the thermostat ever reading Aux Ht. before the aforementioned test.

So, based on the above actions, do you thing I have an emergency heat relay?

Thanks again.

Hello Wise one:

I wired the thermostat as you advised and it works exactly as it should. The only problem I had was setting the changover valve wrong to the heating side versus the cooling side and it cooled instead of heating. I set it in accordance with the instructions and it is now perfect. Thanks again for your expert advice. You are a professional!