5
• If a suspected malfunction occurs with your gas control
system, such as the burners not lighting when they should,
refer to the shutdown procedures on the furnace, or in the
section, “Shutting Down Your Furnace” and call your dealer
as soon as possible.
CHECK AIR FILTER:
Before attempting to start your fur-
nace, be sure the furnace filter is clean and in place. See sec-
tion “Performing Routine Maintenance” in this manual.
Then proceed as follows:
STEPS FOR STARTING YOUR FURNACE
1. Set your room thermostat to the lowest temperature
setting. (See Fig. 8.)
2. Close the external manual gas valve. (See Fig. 9.)
3. Turn off electrical supply to the furnace. (See Fig. 10.)
8
9
4. Remove the furnace access door. (See Fig. 11.)
5. Turn control knob on the gas valve to the OFF position
and wait 5 minutes. Then smell for gas, including near
the floor. If you smell gas,
STOP!
Follow operating
instructions on furnace access door. (See Fig. 12.)
6. After waiting 5 minutes, turn control knob on the gas
valve to the ON position. (See Fig. 12.)
7. Replace furnace access door. (See Fig. 13.)
8. Turn on electrical supply to the furnace and wait
1 minute. (See Fig. 14.)
9. Open the external manual gas valve. (See Fig. 15.)
10. Set room thermostat to a temperature slightly above
room temperature. This will automatically signal the
furnace to start.
11. When the furnace receives the start signal, the hot sur-
face ignitor at the main burners is automatically heated
for 15 to 20 sec. When the microprocessor control ver-
ifies 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, your blower will start
at low speed until the control makes the necessary
adjustments to operate the blower at either the low- or
high-fire speed.
WARNING
If overheating occurs or the gas valve fails to shut
off the gas supply, turn off the manual gas valve
to the furnace BEFORE turning off the electrical
supply. (See Fig. 9.) Failure to follow this warning
could result in a fire or explosion, and personal in-
jury or death.
!
SYSTEM
COOL OFF HEAT
FAN
AUTO
ON
50
70
90
50
70
90
CL
O
S
E
10
11
12
NOTE:
If the burners fail to ignite after 4 attempts, the fur-
nace control system will lockout. If lockout occurs, main
burners fail to light, or blower does not come on, shut down
the furnace and call your dealer for service.
13
14
15
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
“comfort level” are the most costly degrees to obtain.
FF
O
OP
E
N
