Carrier A10247 - Manual (Page 5)

Fig. 9 - Control Switch to ON
8, Replace the outer door.
Fig. 10 - Furnace Door Replaced
9, Turn ON the electrical supply to the furnace.
Fig. 11 - Turn On Electrical Supply
10, Open the external manual gas valve.
Fig. 12 - Open Valve
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 igniter
will energize. When hot, the igniter will have an orange glow.
12, Afterabout 17 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 approxim­
ately 23-43 seconds the furnace blower is switched on,
NOTE: If the main burners fail to ignite, the furnace control
system will go through three more ignition cycles. Then if burners
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 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 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 42-62 sec delay at the “call for heat,” Continuous fan
keeps the temperature level in your home more evenly balanced. It
also continuously filters the indoor air.
Comfort Fan™ -On all but the 38STA or 38STX, the continuous
fan blower speed can be increased or decreased if desired due to
change of seasons, large gatherings in your home, etc. Simply
change your “FAN” switch from “on” to “off” (or “auto”
depending on your thermostat), and then return to “on”, within f to
3 seconds. The blower will switch to the next highest speed. There
are at least 3 speeds to choose from. If the blower is running 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. 3.)
2, Close the external manual gas valve (See Fig. 4).
3, Turn off electrical supply to the furnace, (See Fig. 3.)
4, Remove outer furnace door. (See Fig. 6.)
3, Turn the switch on the gas control to the OFF position, (See
Fig.7,)
6, Replace the outer furnace door. (See Fig. 9.)
7, If the furnace is being shut down because of a malfunction, call
your dealer as soon as possible.