T8024D PROGRAMMABLE MULTISTAGE THERMOSTAT
3
69-1387-1
Fig. 4. Wiring connections.
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.
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.
TERMINAL
SCREW
M20212
G
R
C
Y
W1
B
O
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM)
FOR WRAPAROUND
STRIP 7/16 IN. (11 MM)
Y2
W2
L1
(HOT)
L2
M20214
FAN
RELAY
STAGE-
ONE
HEAT
RELAY
STAGE ONE
COOLING
TRANSFORMER
HEAT
DAMPER
COOL
DAMPER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
1
Y
G
C
W1
R
B
O
Y2
T8024 THERMOSTAT
W2
STAGE-
TWO
COOL-
ING
STAGE-
TWO
HEAT
RELAY
M14674
DASHED LINES INDICATE TABS
ON BACK OF THERMOSTAT
ENGAGE TABS AT TOP OF THERMOSTAT
WITH SLOTS ON WALLPLATE.
PRESS LOWER EDGE OF
CASE TO LATCH.
A
B
SYSTEM
Cool O
ff Heat
Auto On
FAN
Hold
Select
SYST
EM
Cool O
ff H
eat
Auto On
FAN
Hold
Select
TUE
PM
