Shutting Down Your Furnace; Performing Routine Maintenance; Filtering Out Trouble - Carrier INDUCED COMBUSTION 58YAV User's Information Manual

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
burners fail to ignite, the system will lockout. If lockout
occurs, or the blower doesn't 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 compensat-
ing 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 "comfort 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
degree selected on the thermostat, the furnace will be
switched off automatically.
Some thermostats have a "fan" mode with 2 selections:
AUTO or ON. When set on AUTO, the furnace blower
cycles on and off, controlled by the thermostat. In the ON
position, the furnace blower runs continuously except for
a 45-sec delay at the "call for heat." This keeps the tem-
perature 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 pro-
cedures must be followed:
1. Set your room thermostat to the lowest temperature
setting. (See Fig. 16.)
2. Close the external manual gas valve. (See Fig. 6.)
3. Turn OFF the electrical power to your furnace.
(See Fig. 17.)
®

Performing routine maintenance

With the proper maintenance and care, your furnace will
operate economically and dependably. Basic maintenance,
which can easily be accomplished by someone who
follows the directions, is found on this and the following
pages. However, before beginning maintenance, follow
these safety precautions:

Filtering out trouble

A dirty filter will cause excessive stress on the furnace and
can cause it to overheat and automatically shut down. The
furnace filter should be checked every 3 or 4 weeks and
cleaned if necessary.
If your furnace filter needs replacing, be sure to use the
same size and type of filter that was originally supplied.
Use the Furnace Filter Table on the next page and compare
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your furnace size with the proper filter size.
The air filter is normally located in the blower compart-
ment. If the filters have been installed in another location,
contact your dealer for instructions. To inspect, clean, and/
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or replace the air filter(s), follow these steps:
5
4. Remove the control access door on your furnace.
(See Fig. 8.) Removal of the blower access door is not
required.
5. Turn the control knob or switch on the gas valve to the
OFF position. (See Fig. 18 or 19.)
6. Replace the control access door. (See Fig. 13.)
7. If the furnace is being shut down because of a mal-
function, call your dealer as soon as possible.
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WARNING
!
Turn off electrical power supply to your furnace
before removing the access doors to perform ser-
vice or maintenance. A failure to follow this warn-
ing could result in personal injury or death.
CAUTION
!
Although special care has been taken to minimize
sharp edges, be extremely careful when handling
parts or reaching into the furnace.
CAUTION
!
Never operate your furnace without a filter in
place. Doing so may damage the furnace blower
motor. An accumulation of dust and lint on inter-
nal parts of your furnace can cause a loss of effi-
ciency.
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