Honeywell T8400C Installation Instruction page 5

3, Press the • key. Factory information is displayed
A typical example is shown, but information dis-
played varies by mode_ This information is for fac-
tory use only
M14_7
4. Press the • key again to display C or F
M14_8
5. Press the • key to change the C or °F indication
M14_9
6. Press the • key to display the heat cycle rate of 1,
3, 4, 5, 6, 9, or f 2 ff the desired cycle is displayed,
press the • key to exit the installer setup mode To
change the heat cycle rate, press the • key to
scroll between 1, 3, 4, 5, 6, 9, or 12. Stop scrolling
when the desired rate is displayed See Table 1 for
the cycle rate options and the corresponding sys-
tem equipment
M14690
7, Press the • key to display cooling algorithm con-
figuration default
M1_19
8. Press the • key again to change cooling algorithm
to Cl or C3.
Cl = Standard cooling algorithm
C3 = Aggressive cooling algorithm (can cause
overshooting).
g. 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)
M1_20
Table 1, Heating Cycle Rates.
System
Steam, gravity
Hydronic heat, condensing gas
furnace a
Gas or oil forced air
Electric heat
Special applications b
aHigh efficiency furnace
bRefer to equipment manufacturer's instructions
Cycles Per Hour
1
3
6
9
4,5,12
T8400C ELECTRONIC THERMOSTAT
10. Press the • key to save all changes, exit installer
setup mode and return to normal operation
NOTE: After exiting installer setup mode, change the
setpoint to the desired room temperature
CHECKOUT
Heating
1. Slide the SYSTEM switch to Heat and the FAN
switch to Auto
2. Press and hold the • key to raise the temperature
setting several degrees above the room tempera-
ture After approximately ten seconds, the heating
equipment should start. In conventional systems.
the system turns on the fan through the use of a
time delay relay or through a limit control When
using an electric heat thermostat, the fan starts
immediately
3. Press the • key to lower the temperature setting
below the room temperature Heating equipment
should stop
Cooling
zL
CAUTION
Low Temperature Hazard.
Operating at too low of an outdoor
temperature may cause compressor damage.
Do not operate cooling if outdoor temperature is
below 5O°F (10 C). Refer to manufacturer's
recommendations. To avoid possible compressor
damage, allow the compressor to remain off for
five minutes before restarting
1. Slide the SYSTEM switch to Cool and the FAN
switch to Auto
g. Press the • key to lower the temperature setting
several degrees below the room temperature After
approximately five minutes, the cooling equipment
should start The fan starts and stops with the cool-
ing equipment
3. Press the • key to raise the temperature setting
above the room temperature Cooling system
should shut down.
NOTE: To bypass the 5 minute delay, see the Optional
System Checkout section
Fan
1. Slide the SYSTEM switch to Off and the FAN
switch to On. The fan should run continuously
g. Slide the FAN switch to Auto in heating, the fan is
controlled directly by the heating equipment and
may start a few minutes after the heating equip-
ment turns on (on most systems) When using an
electric heat thermostat, the fan starts and stops
with the heating equipment In cooling, the fan
starts and stops with the cooling equipment
Make certain all equipment responds properly to the
thermostat
5 69-1485-1