View Full Version : Replacing Lennox 51h4301 with a Honeywell RTH7600
reennee1000
Dec 9, 2010, 06:26 PM
Looking for the wiring match-up to replace my existing thermostat 51H4301 to a Honeywell RTH7600 unit. My outside unit HP21-511-4P and the inside unit is CB19-51-3P-TXV.
The current wiring for the thermostat is:
O
G
C
R
T
W1 - two tied together on one screw
Y1
Y2
Can anyone help?
T-Top
Dec 9, 2010, 06:51 PM
If you can give us the wire match up (color)of the old thermostat we can walk you through it. Or check out.customer.honeywell.com/Honeywell/getliterature.axd?LiteratureID
reennee1000
Dec 9, 2010, 07:06 PM
The wire match up on the old thermostat is:
O - Orange
G - Light green
C- Green
R - Red
T - Brown
W1 - a Red and a White
Y1 - Yellow
Y2 - Black
Does that help?
T-Top
Dec 11, 2010, 06:19 PM
All should match up the same way. You can tape or cap off the brown wire "T" it is used for a outside thermostat. Set your new thermostat up for heatpump 2 stage coolng 3 stage heat.