5
12
13
8.
Replace
the outer door and tighten the thumbscrew. (See
Fig. 11.)
9. Turn
ON
the electrical supply to the furnace. (See
Fig. 12.)
10. Open the external manual gas valve. (See Fig. 13.)
11. 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.
12. After about 32 seconds, 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 25-45 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 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.
13. 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 setting
selected on the thermostat, the furnace will be automatically
switched off.
Continuous Fan Operation
-Some thermostats have a “FAN’’
switch 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 con-
tinuously except for a 42-62 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.
Comfort Fan™
-On all but the 58STA or 58STX, the blow-
er speed can be increased or decreased if desired due to
change of seasons, large gatherings in your home, etc. Sim-
ple change your “FAN” switch from “on” to “off” (or “auto”
depending on your thermostat), and then return to “on.”
The blower will switch to the next highest speed. There
are at least 3 speeds to choose from. If the blower is run-
ning on its highest speed, a request to change will direct
the blower to return to its lowest speed.
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. 14.)
2.
Close
the external manual gas valve (See Fig. 6 on page 4.)
3. Turn
OFF
electrical power to your furnace. (See Fig. 15.)
14
15
4.
Remove
the outer door on your furnace. (See Fig. 8.)
5. Turn the switch on the gas valve to the
OFF
position. (See
Fig. 16.)
6.
Replace
the outer door. (See Fig 11.)
7. If the furnace is being shut down because of a malfunc-
tion,
call
your dealer as soon as possible.
16
PERFORMING ROUTINE
MAINTENANCE
With proper maintenance and care, your furnace will operate
economically and dependably. Basic maintenance, which can
easily be accomplished by someone who follows the directions,
OP
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O
F
F
2
3
1
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P
ON
O
F
F
C
ON
OFF
OR
