Carrier 58EJA - Manual (Page 8)

Some thermostats have a “fan” switch with two selections:
AUTO or ON. When set on AUTO, the hirnace blower cy­
cles on and off, controlled by the thermostat. In the ON
position, the furnace blower runs continuously except for a
60 second 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 procedures must
be followed:
1. Set your room thermostat to the lowest temperature set­
ting. (See Fig. 12.)
2. Close the external manual gas valve. (See Fig. 7.)
3. Thm OFF the electrical power to your furnace. (See Fig.
4. Tbrn the control knob on the gas valve to the OFF position.
(See Fig. 14.)
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5. If the furnace is being shut down because of a malfunction,
call your dealer as soon as possible.
A WARNING
Tbrn OFF electrical power supply to your furnace before re-
movingtheaccess doors to service orperfoim maintenance.
Failure to follow this warning could result in personal in­
jury or death.
A CAUTION
Although special care has been taken to minimize sharp
edges, be extremely careful when handling parts or reach­
ing into the furnace.
FILTERING OUT TROUBLE
A dirty filter will cause excessive stress on the furnace blower
motor and can cause it to overheat and automatically shut
down. The furnace filter should be checked every 3 or 4 weeks
and cleaned if necessaiy.
A 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 internal parts of your furnace can cause
a loss of efficiency.
The air filter is normally located in the blower compartment be­
fore the blower (See Fig. 16.) If thefilter(s) has been installed in
another location, contact your dealer for instructions. To in­
spect, clean and/or replace the air filter(s), follow these steps:
If your furnace filter needs to be replaced, be sure to use the
same size and type of filter that was originally supplied. Use the
furnace filter table and compare your furnace size with the
proper filter size.
HORIZONTAL FURNACE FILTER TABLE
HORIZONTAL
FURNACE
CASING WIDTH
FILTER SIZE
(INCHES)
FILTER
TYPE
50,000 (1)13x23x1 Cleanable
75,000 (1) 13x23x1 Cleanable
100,000 (1)16x23x1 Cleanable
125,000 (1) 20x23x 1 Cleanable
REMOVE THE FILTER FOR CLEANING AS FOLLOWS:
1, Turn OFF electrical supply to the furnace. (See Fig. 13.)
2. Remove blower access door located at the inlet (return air)
end of the furnace (4 screws must be removed). (See Fig.
15.)
A CAUTION
Furnace is not to be installed, operated, and then turned off
and left turned off in an unoccupied structure during win­
ter. (See winterizing procedures in maintenance section).
PERFORMING ROUTINE MAINTENANCE
With proper maintenance and care, your furnace will operate
economically and dependably. Instructions for basic mainte­
nance, which can easily be followed, are found on this and the
following pages. However, before beginning maintenance, fol­
low these safety precautions:
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