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1 − Make wiring connections per the
appropriate wiring diagram on
page 6 or 7. Refer to the table
below for terminal designations.
Terminal
Y2
Second−stage cooling
Second−stage heating
W2 (AUX)
(or auxiliary heating)
First−stage heating
W (E)
(or emergency heating)
S1
Remote outdoor sensor
S2
Remote outdoor sensor
R
24V power
O
Reversing valve
B
Reversing valve
G
Fan relay
Y
First−stage cooling
C
24V common
L
Equipment monitor
2 − Refer to inner terminal labels
when using the thermostat with
conventional systems (gas, oil or
electric heat plus air conditioning).
Refer to outer terminal labels in
heat pump applications. See fig-
ure below.
3 − Loosen screws of terminals that
will be used. Insert appropriate
wires in the terminal block under
Description
Page 5
the loosened screws. Securely
tighten each screw.
WALLPLATE
WIRE HOLE
LABELED WIRES
INSERT WIRE IN HOLE
4 − Connect wires to the correspond-
ing screw terminals per the ap-
propriate diagram.
5 − Push excess wire back into the
wall.
6 − Plug hole with nonflammable in-
sulation to prevent drafts from af-
fecting thermostat.
LED Indicator
An LED indicator is located in the up-
per right corner of the thermostat. It is
only visible when lit.
When an equipment monitor is con-
nected to the thermostat L terminal,
the LED lights when the monitor sends
a check or failure message to the ther-
mostat.
The LED requires the use of 24Vac
common power. The indicator will not
light when the thermostat is powered
by the batteries alone, or when 24Vac
power is interrupted.
Outdoor Temperature Sensor
Install the optional outdoor tempera-
ture sensor (X4148) as outlined in the
instructions provided with the sensor.
TERMINAL
BLOCK
LETTER
DESIGNATIONS
R
O
B
G
Y
C
SCREW
TERMINALS
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