6
7. Replace control access door. (See Fig. 16.)
16
17 18
8. Turn ON the electrical supply to the furnace and wait 1
minute. (See Fig. 17.)
9. Open the external manual gas valve. (See Fig. 18.)
10. Set the room thermostat to a temperature slightly
above the room temperature. This will automatically
signal the furnace to start.
11. When the furnace receives the start signal, the hot surface
ignitor at the main burners is automatically heated for 15
to 20 sec. When the microprocessor control verifies that
there is sufficient heat to ignite, the gas valve permits gas
to flow to the main burners. After ignition and a time delay
of about 35 sec, the furnace blower will start. Variable-
capacity furnaces start at low speed until the control
makes the necessary adjustments to operate the blower at
either the low- or high-fire speed.
NOTE:
If the burners fail to ignite after 4 attempts, the fur-
nace control system will lock out. If lockout occurs, main
burners fail to light, or blower does not come on, shut down
the furnace and call your dealer for service.
12. Set your thermostat to the temperature that satisfies
your comfort requirements. SUGGESTION: Setting
the thermostat back a few degrees—and compensating
for the difference with warmer clothing—can make a big
difference in your fuel consumption on extremely cold
days. The few degrees at the top of your thermostat “com-
fort level’’ are the most costly degrees to obtain.
When the room temperature drops below the temperature
selected on the thermostat, the furnace will switch on auto-
matically. When the room temperature reaches the degree
selected on the thermostat, the furnace will be switched off
automatically.
Some thermostats have a “FAN’’ mode with 2 selections:
AUTO and ON. When set on AUTO, the furnace blower
cycles on and off, controlled by the thermostat. In the ON
mode, the furnace blower runs continuously. This keeps the
temperature level in your home more evenly balanced. It also
continuously filters the indoor air.
SHUTTING DOWN YOUR FURNACE
Should you ever need to shut down your furnace for service
or maintenance, you will need to turn the furnace off. The
following procedures must be followed:
1. Set your room thermostat to the lowest temperature
setting. (See Fig. 19.)
2. Close the external manual gas valve (See Fig. 9.)
3. Turn off electrical supply to the furnace. (See Fig. 20.)
19
4. Remove main furnace door. (See Fig. 11.)
5. Turn the control knob or switch on the gas valve to the
OFF position. (See Fig. 21 or 22.)
6. Replace the control access door. (See Fig. 16.)
7. If the furnace is being shut down because of a malfunc-
tion, call your dealer as soon as possible.
PERFORMING ROUTINE
MAINTENANCE
With proper maintenance and care, your furnace will operate
economically and dependably. Instructions for basic mainte-
nance are found on this and the following pages. However,
before beginning maintenance, follow these safety precautions:
20
O
P
E
N
CAUTION
Furnace is not to be installed, operated, and then
turned off and left turned off in an unoccupied
structure during winter. (See winterizing proce-
dures in maintenance section).
®
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