Install Instructions

10
WIRING THERMOSTAT
Thermostat wiring connections with various units,
including dual fuel, zone control, and applications
that include the Humiditrol
®
Enhanced
Dehumidification Accessory (EDA). See figures 3
through 7. For whole home dehumidifier, refer to
the installation instruction for the dehumidifier.
1. Connect wiring between thermostat, indoor
unit, and outdoor unit as shown in the
appropriate wiring diagram.
2. Connect optional (purchase separately)
outdoor sensor. See Installing Outdoor
Sensor for further details and provided wiring
diagrams.
3. Seal the hole in the wall with a suitable
material to prevent drafts from entering the
thermostat case.
4. Configure thermostat and equipment for
system type, program the thermostat, and
test system.
TERMINAL DESIGNATIONS
Tc - Outdoor Temp. Sensor Connection 1
To - Outdoor Temp. Sensor Connection 2
H - Humidification relay (to Humidifier)
D - Dehumidification relay (to DS terminal)
W2 - Second-stage heating (non-heat pump) or 4th
stage (heat pump)
Y2 - Second-stage heating or cooling
O - Cool active reversing valve
B - Heat active reversing valve
C - Common 24VAC
G - Fan relay
W1 - First-stage heating (non-heat pump or
emergency heat) or third-stage heating
(heat pump)
Y1 - First-stage heating or cooling
R - 24VAC power