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Douglas, HVAC Technician
Category: HVAC
Satisfied Customers: 3089
Experience:  Manufacture Rep for Major Brand, Technical Trainer, NATE
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my tho has E,AX,Y,G,O,L,R,B, and C MY UNIT HAS Y2,Y1,G,O,W,C,R,DH,ALI,andA.

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my tho has E,AX,Y,G,O,L,R,B, and C MY UNIT HAS Y2,Y1,G,O,W,C,R,DH,ALI,andA. which letter on tho hooks to which letter on unit
Hi, I'm Douglas and I am here to help you resolve problems with your heating and cooling equipment.

It looks as though your unit has 2 stages of cool, but your thermostat is a single stage cooling thermostat.

What is the unit you are trying to control? (Brand and model)
Customer: replied 3 years ago.

it is a heat controller htv/htd/hth series geothermal heat pump it is a 5 ton unit in a 3000 sq.ft. house. it os a heat controller HTH060A1C00JRW

You really want a two stage thermostat to take full advantage of the two stage geothermal unit. It can be done, but it would really de feature what you have.

Yours must have the ECM version II interface.

I if you want this thermostat to work for now,...

Y------------------------------------- ------Y1---Y2

Where you see two connections such As I showed Y1----y2, this means to install a jumper
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