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T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS
68-0195–2
6
Fig. 11. T8024D multistage heat/cool wiring diagram.
Setting Fan Operation (Fuel) Switch
The fan operation (fuel) switch is preset at the factory in the F
position. See Fig. 11. This is the correct setting for most
systems. If this system is an electric heat system, set the
switch to the E position. The E setting allows the fan to turn
on immediately with the heating or cooling equipment in a
system where the G terminal is connected.
M12580
FAN OPERATION
(
FUEL
)
SWITCH
F
E
Fig. 13. Mounting thermostat to wallplate.
1. Enter Installer Setup.
a. Use ▲ or ▼ keys to set
the temper-ature
setpoint to 52 °F (11°C).
b. Press the ▲ and ▼ keys
simultaneously for more
than two seconds to
enter installer setup.
When released a
software revision code
is displayed.
c. Press the ▲ key.
Factory config-uration
(FC) is displayed (A
typical example is
shown, but information
displayed varies by
model. This information is for factory use only).
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 Off Heat
Auto On
F
A
N
Hold
Select
SYSTEM
C
ool Off Heat
A
u
to
O
n
FAN
Hold
Select
T
U
E
P
M
M12582A
SET
HT.
M12583A
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
Fig. 12. Fan operation (fuel) switch.
Mounting Thermostat to Wallplate
1. Slide SYSTEM switch to the Off position.
2. Engage the tabs at the top of the thermostat and
wallplate.
3. Swing down the thermostat and press the lower edge of
the thermostat onto the wallplate to latch. See Fig. 12.
INSTALLER SETUP
Setting °F/°C Indication and Heat Cycle Rate
The following instructions provide the information necessary
to change the heating cycle rate to match the heating
equipment and to choose either Fahrenheit (°F) or Celsius
(°C) display.
NOTE: All four steps must be completed to save changes to
the °F/°C indication and the heat cycle rate.
M12584A