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T8400C ELECTRONIC THERMOSTAT
Cooling
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 50°F (10°C). Refer to equipment manufac-
turer instructions.
• For compressor protection, during power
interruption and on initial startup, the T8400C
Electronic Thermostat will go into a five minute
delay. During this delay, the cooling icon, a
snowflake , will flash.
1. Slide the SYSTEM switch to Cool and the FAN
switch to Auto.
2. 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
cooling equipment.
3. Press the ▲ key to raise the temperature setting
above the room temperature. Cooling system should
shut down.
NOTE: To bypass the five minute delay, see Optional
System Checkout section.
Fan
1. Slide the SYSTEM switch to Off and the FAN switch
to On. The fan should run continuously.
2. 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 equipment
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.
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