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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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3 New HVAC systems attempting to switch thermostats I've to

Customer Question

3 New HVAC systems attempting to switch thermostats I've to alarm.com. Set to cool blowing warm. Insulated pipe going to outside units is hot not cold. It is a heat pump unit
Submitted: 8 months ago.
Category: HVAC
Expert:  BillyHvac replied 8 months ago.

hello my name is Billy

Did you program in menu for heat pump?

Customer: replied 8 months ago.
It said to switch it P2A2 for heat pump I only have P1A1 or the not heat pump C1H1
Expert:  BillyHvac replied 8 months ago.

Ok can you tell me what color wire you have on what terminal?

Customer: replied 8 months ago.
Red-RC
White-W
Brown-C
Yellow-Y
Green-G
Orange- O/B
Expert:  BillyHvac replied 8 months ago.

you have everything correct...if you set to heat does it blow cool?

Customer: replied 8 months ago.
Didn't try that just ac blows hear. Want me to try that?
Customer: replied 8 months ago.
Heat
Expert:  BillyHvac replied 8 months ago.

yes...and also are these 3 separate systems or run by a zone panel and 1 hvac system?

Customer: replied 8 months ago.
3 seperate units.
Expert:  BillyHvac replied 8 months ago.

Thank you,

Now in the set up...do you see mention of setting the reverse valve O/B?

Customer: replied 8 months ago.
Air wasn't cold or warm just air lol
Expert:  BillyHvac replied 8 months ago.
Thank you,Now in the set up...do you see mention of setting the reverse valve O/B?
Customer: replied 8 months ago.
Are you talking about the install manual?
Expert:  BillyHvac replied 8 months ago.

correct in the thermostat set up guide...we want to set the O/B terminal option.

This terminal determines if it heats or cools.

Expert:  BillyHvac replied 8 months ago.

I am having issue with my data download right now so I am going to refer this to another peer as to not slow things down for you. Just a moment

Customer: replied 8 months ago.
This is basically what I have to go off of. It does say in the trouble shooting if this problem happens you may have to have a dealer go in and change the on configuration
Customer: replied 8 months ago.
Hello?
Expert:  Phil replied 8 months ago.

Hello, the program that must be changed is INSIDE the thermostat, the O/B function needs to be reversed. That is done by pressing buttons on the thermostat (according to manuals directions).

If we focus on that, we will have this problem solved in no time

Customer: replied 8 months ago.
Ok how do I do that?
Expert:  Phil replied 8 months ago.

Hello again, first off it is not possible to read the manual you have using those shadowy photo's... secondly you have mixed brands there, that is a problem.

We solve some of that problem by removing the front of the thermostat and reading the brand name and its model number from the back... post those here, I will see what I can do.

Customer: replied 8 months ago.
Back of thermostat
Customer: replied 8 months ago.
The thermostat installed by havac contractor is a Honeywell. Thermostat I'm attempting to install is the alarm.com that I sent the pic of
Expert:  Phil replied 8 months ago.

Honeywell is the largest thermostat maker in the world, they currently have over 100 different models.. going back a few years there are over a thousand.

I need to know very specifically which exact model number so that it can be programmed correctly, or indeed if it is the correct thermostat made to work with that *mix of indoor and outdoor unit.

Customer: replied 8 months ago.
Back of thermostat to be replaced.
Customer: replied 8 months ago.
Front of thermostat to be replaced
Customer: replied 8 months ago.
Backplate of thermostat to be replaced
Customer: replied 8 months ago.
This is how the Honeywell was wired
Expert:  Phil replied 8 months ago.

Thanks, ***** ***** you have it wired for a conventional system, not a heat pump system... and you apparently have a heat pump system. I need the brand WITH the model number of of both the indoor and outdoor units to assess that.

Customer: replied 8 months ago.
The wire configuration I sent you is what the HVAC guy installed so that concerns me some.
Expert:  Phil replied 8 months ago.

If you have a NON heat pump system he has it wired correctly.... if you have a heat pump system he wired the thermostat to the wrong terminal strip in the thermostat.

get me the model numbers I need and I will check that out for you.