5
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 fur-
nace’s heat exchanger. After a
time delay of approximately 45
sec, the furnace blower is
switched on.
12
13
14
15
16
17
NOTE: If the main burners fail to
ignite, the furnace control system will
go through 3 more ignition cycles. If
burners still fail to ignite, the system
will lockout. (Under some circum-
stances the furnace may reset from
lockout and attempt to ignite if a call
for heat still exists.) If lockout occurs
or the blower does not come on, refer
to the shutdown procedures on the
furnace or see “Shutting Down Your
Furnace” section in this manual, and
call your dealer for service.
12. Set your thermostat to the tem-
perature that satisfies your com-
fort requirements.
SUGGESTION: Setting the ther-
mostat back a few degrees and
compensating for the difference
with warmer clothing can make a
big difference in your fuel con-
sumption. The few degrees at the
top of your thermostat “comfort
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
automatically. When the room temper-
ature reaches the setting selected on
the thermostat, the furnace will auto-
matically switch off.
Some thermostats have a “FAN’’
switch with 2 selections, AUTO and
ON. When thermostat is set to AUTO,
the furnace blower cycles on and off,
controlled by the thermostat. In ON
position, the furnace blower runs
continuously except for a 77-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. When FAN
switch is moved from ON to AUTO,
the furnace blower will continue run-
ning for 90 sec before stopping.
SHUTTING DOWN
YOUR FURNACE
Should you ever suspect a malfunction
in your furnace, you will need to turn
the furnace off. The following proce-
dures must be followed:
1. Set your room thermostat to the
lowest temperature setting.
(See Fig. 18.)
2. Close the external manual gas
valve. (See Fig. 8.)
3. Turn off electrical power to your
furnace. (See Fig. 19.)
4. Remove the control access door
on your furnace. (See Fig. 10 or
11.) On upflow furnaces, remov-
ing the blower access door is not
required.
18
19
5. Turn the control knob on the gas
valve to the OFF position. (See
Fig. 20.)
6. Replace the control access door.
(See Fig. 14 or 15.)
7. If the furnace is being shut down
because of a malfunction, call
your dealer as soon as possible.
SYSTEM
COOL
OFF
HEAT
FAN
AUTO
ON
50
70
90
50
70
90
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