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TERMINAL
FOR STRAIGHT
SCREW
INSERTION STRIP
5/16 IN. (8 MM)
G
C
R
W1
Y
Fig. 4. Wiring connections.
STAGE-
ONE
HEAT
RELAY
1
FAN
L1
RELAY
(HOT)
L2
TRANSFORMER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
Fig. 5. Typical hookup of T8024 in two-stage heat and
two-stage cool system with manual changeover.
Mounting Thermostat to Wallplate
1. Engage the tabs at the top of the thermostat and
wallplate.
2. Swing down the thermostat and press the lower
edge of the thermostat onto the wallplate to latch.
See Fig. 6.
OPERATION
Setting FAN and SYSTEM Switches
Fan and system settings are controlled manually by
using the switches located at the bottom of the
thermostat case. See Fig. 7.
FOR WRAPAROUND
STRIP 7/16 IN. (11 MM)
W2
Y2
B
O
M20212
T8024 THERMOSTAT
G
C
W2
R
Y2
W1
B
Y
O
STAGE-
TWO
COOL-
ING
COOL
STAGE-
DAMPER
TWO
HEAT
STAGE ONE
HEAT
RELAY
COOLING
DAMPER
M20214
T8024D PROGRAMMABLE MULTISTAGE THERMOSTAT
A
ENGAGE TABS AT TOP OF THERMOSTAT
WITH SLOTS ON WALLPLATE.
T U E
B
PRESS LOWER EDGE OF
CASE TO LATCH.
Fig. 6. Mounting thermostat wallplate.
FAN Switch
Fan switch settings are:
On: The fan runs continuously. Use for improved air
circulation and air quality.
Auto: Normal setting for most homes. In cooling, the
fan starts and stops with the cooling equipment. In
heating, the fan is controlled directly by the heating
equipment and may start a few minutes after the
heating equipment turns on (on most systems).
When using an electric heat thermostat, the fan
starts and stops with the heating equipment.
Slide the FAN switch in the bottom left corner of the
thermostat to select the desired fan setting.
SYSTEM Switch
System switch settings control thermostat operation as
follows:
Cool: The thermostat controls the cooling system.
Off: Both heating and cooling are off.
Heat: The thermostat controls the heating system.
3
DASHED LINES INDICATE TABS
ON BACK OF THERMOSTAT
H o l d
S e l e
c t
M14674
69-1387-1
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