T8024D PROGRAMMABLE MULTISTAGE THERMOSTAT
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b. Press ▼ to change number of cooling stages.
c. Press ▲ to display number of heat stages.
d. Press ▼ to change number of heat stages.
4. Setting Heat Cycle Rate (see Table 1) for the cycle
rate options and equipment).
a. Press the ▲ key to display the current heat
cycle rate setting of 1, 3, 4, 5, 6, 9, or 12 cph.
NOTE: If thermostat is set up to operate two stages of
heat, both stages operate at the selected cycle
rate.
b. If the desired cycle rate is displayed, press the
▲ key to exit the Installer Setup.
c. To change the heat cycle rate, press the ▼ key
until your choice of 1, 3, 4, 5, 6, 9, or 12 is
displayed.
d. Press the ▲ key to display algorithm configura-
tion default.
e. Press the ▲ key again to change algorithm to
C1 or C3.
C1 = Standard algorithm.
C3 = Aggressive algorithm (can cause over-
shooting).
f. Press the ▲ key again. Current configuration
(CC) is displayed. A typical example is shown,
but CC varies by model. (This information is for
factory use only.)
5. Exit Installer Setup.
a. Press the ▲ key to save all changes and return
to normal operation.
Table 1. Heating Cycle Rates for Stage-Two Heating.
a
High efficiency furnace.
b
Refer to equipment manufacturer’s instructions.
PROGRAMMING
The thermostat is flexible and can be programmed for
different schedules for weekdays and weekends.
Four time periods are available during weekdays and
weekends —WAKE, LEAVE, RETURN, and SLEEP.
IMPORTANT
Always press the keys with your fingertip or sim-
ilar blunt tool. Sharp instruments like pens and
pencil points can damage the keyboard.
Setting the Current Time and Day
1. To set current time.
a. Press Select twice.
b. Press ▲ or ▼ to set current time.
NOTE: While setting the current time, the word SET is
displayed.
2. To set day of week.
a. Press Select again.
b. Press ▲ or ▼ to set current day.
To use the preprogrammed time and temperature (see
Table 2), press Hold to exit the programming mode. For
instructions on programming the thermostat, refer to the
Owner’s Guide.
M20215
M20217
M20218
M12589A
M12588A
M14691
M14692
System Cycles Per Hour
Steam, gravity 1
Hydronic heat, condensing gas
furnace
a
3
Special applications
b
4,5
Gas or oil forced air (default) 6
Electric heat 9
Special applications
b
4, 5, 12
M12590A
PM
M12591A
SET
PM
M18534
SET