Manual & Installer Guide 78
W3 3rd stage heat circuit
W3/AUX
(PSP4273CT only)
3rd stage heat circuit / 2nd stage aux heat / hum / dehum
W2 2nd stage heat circuit
W1/O/B 1st stage heat circuit
Y2 2nd stage compressor relay
Y1 1st stage compressor relay
G fan relay
R 24 VAC return
C 24 VAC common
SENSOR remote/outdoor/supply/return sensor connections
IMPORTANT: This thermostat requires both R (24 VAC Return) and
C (24 VAC Common) be connected to the backplate terminals.
NOTE:
The backplate does not fully cover
a full size vertical junction box. The
PSPAC-WPT ProStat+ Wallplate or
a single-gang, horizontally mounted
junction box would be needed for that
type of installation
Installation Instructions – Thermostat Backplate
W3/AUX
W2
W1/O/B
Y2
Y1
SENSOR
To remove the thermostat backplate:
Using the Finger Pull Areas, pull the front
housing away from the backplate.
Backplate
Front Housing
Look for these tabs to
locate the pull areas
Pull out with thumbs in these areas
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