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SINGLE-STAGE
GAS
CONTROL
MObULAT_NG GASCOm_Ot
SHOWNFN _OFF ¸ ' PosmoN
Fig. 11 - Control
Switch
to OFF
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6. After waiting five minutes, turn control switch on the gas con-
trol to the ON position.
Turn the control switch
to ON.
See
Fig. 12.
I
GAS CONTROL SWffCH
MODULATING
GAS CONTROL
SHOWN
[N "ON"
POSfflON
Fig. 12 - Control
Switch
to ON
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7. Replace
main furnace
door.
See Fig. 13.
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Fig. 13 - Furnace
Door
Replaced
(Upflow
Configuration)
8. Turn ON the electrical supply to the furnace and wait one
nfinute. See Fig. 14.
Fig. 14 - Turn
on Electrical
Supply
A92359
9. Open the external
manual
gas valve,
See Fig. 15.
i
t
Fig. 15 - Open
Valve
A06189
10. Set the room thermostat
"MODE"
to "HEAT"
and adjust the
set point to a temperature
slightly
above the room temperat-
ure. This will automatically
signal the furnace to start.
11. When the furnace receives
the start signal, the combustion
air
draft inducer
is started.
When the pressure
switch senses that
there is sufficient
combustion
air, the hot surface igniter is en-
ergized.
After the hot surface igniter is heated for about 20 seconds, the
gas valve pernfits
gas to flow to the main burners.
After igni-
tion and a time delay of up to 60 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-heat
speed.
NOTE:
If the main burners
fail to ignite after four attempts,
the
furnace
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 thermo-
stat back a few degrees--and
compensating
for the differ-
ence with
warmer
clothing--can
make
a big difference
in
your fuel consumption
on extremely
cold days. The few de-
grees 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 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 two selections:
AUTO
and ON. When the them_ostat is
set on AUTO,
the furnace
blower
cycles
on and off, controlled
by
the
themmstat.
In
ON
position,
the
furnace
blower
runs
continuously.
Continuous
fan keeps the temperature
level in your
home
more evenly balanced.
It also continuously
filters the indoor
air.
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