5
1
2
13
14
15
18 19
9. Open the external manual gas valve. (See Fig. 19.)
10. Set the room thermostat to a temperature slightly
above the room temperature. This will automatically
signal the furnace to start. The inducer motor will start,
and the hot surface ignitor will energize. When hot, the
ignitor will have an orange glow.
11. After 15 to 70 sec, the gas valve permits gas to flow to
the main burners where it is ignited. Hot flames begin
to warm the furnace’s heat exchanger. After a time
delay of approximately 45 sec, the furnace blower is
switched on.
NOTE:
If the main burners fail to ignite, the furnace control
system will go through 3 more ignition cycles. Then, if burn-
ers still fail to ignite, the system will lockout. If lockout
occurs, or the blower does not come on—shut down your
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 be switched on
automatically. When the room temperature reaches the set-
ting selected on the thermostat, the furnace will be automat-
ically switched off.
Some thermostats have a “FAN’’ mode with 2 selections,
AUTO and ON. When thermostat is set on AUTO, the furnace
blower cycles on and off, controlled by the thermostat. In ON
position, the furnace blower runs continuously except for a
45-sec delay at the “call for heat.’’ 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 suspect a malfunction in your furnace, 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. 20.)
2. Close the external manual gas valve (See Fig. 8 on page
4.)
3. Turn OFF electrical power to your furnace. (See Fig. 21.)
F
F
O
O
F
F
2
3
1
M
P
ON
O
F
F
C
ON
OFF
OR
ON
O
F
F
2
3
1
M
P
ON
O
F
F
C
ON
OFF
OR
O
P
E
N
16
17
(12 pages)
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