69-1386-1 G.H. Rev.
10
-01
Printed in Mexico
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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 manufacturer’s
recommendations.
• For compressor protection, during power
interruption and on initial startup, the T8424
Thermostat goes into a 5 minute delay. During
this delay the cooling icon, a snowflake
❄
,
flashes.
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 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.
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 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.