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Charles
Charles, HVAC Technician
Category: HVAC
Satisfied Customers: 91
Experience:  Associates Degree in HVAC with four Years experience
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my thermostat does not have a w1 or w2 connection. my heat

Resolved Question:

my thermostat does not have a w1 or w2 connection. my heat pump has R, C, G, W1, W2. What do terminals W1 and W2 control?
Submitted: 7 years ago.
Category: HVAC
Expert:  Charles replied 7 years ago.

Hello these terminals are for your first an second stage heating. What are the terminals of your termostat?

Customer: replied 7 years ago.

RC

R - Power with jumper

Y compressor

C 24VAC common (optional with battery)

O/B changeover valve

G fan relay

AUX auxillary heat relay

E emergency heat relay

L sends output when set to emergency heat

Expert:  Charles replied 7 years ago.

ok i would take the thermostat that you bought back an get a normal two stage heating thermostat here is a link to excatly what you need you can see the terminal makings that you need are right there on the page http://www.pexsupply.com/Robertshaw-9615-9615-Digital-Programmable-Thermostat-4845000-p

 

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Customer: replied 7 years ago.
are you saying that this thermostat will not work? or it would be better to have a different one?
Expert:  Charles replied 7 years ago.

or this can be wired

R to R

G to G

C to Y

W1 to O/B

W2 to Aux



Edited by Charles on 1/7/2010 at 4:39 PM EST
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Expert:  Charles replied 7 years ago.
this thermostat uses the Y terminal to control the compressor in both heat and cooling modes
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