Filtering Out Trouble; Performing Routine Maintenance - Carrier 58EFB User's Information Manual

®
2. Close the external manual gas valve. (See Fig. 7.)
3. Turn off the electrical power to your furnace. (See Fig. 14.)
4. Turn the switch on the gas valve to the OFF position. (See
Fig. 15.)
5. If the furnace is being shut down because of a malfunction,
call your dealer as soon as possible.

PERFORMING ROUTINE MAINTENANCE

With proper maintenance and care, your furnace will operate
economically and dependably. Instructions for basic mainte-
nance are found on this and the following pages. However, be-
fore beginning maintenance, follow these safety precautions:
WARNING
!
Turn off electrical power supply to your furnace be-
fore removing the access doors to service or perform
maintenance. Failure to follow this warning could re-
sult in personal injury or death.
Although special care has been taken to minimize
sharp edges, be extremely careful when handling
parts or reaching into the furnace.

FILTERING OUT TROUBLE

(Optional Accessory)
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 necessary.
13
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. 17.) If the filter(s) has been installed in
another location, contact your dealer for instructions. To inspect,
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 fur-
nace filter table and compare your furnace size with the proper
filter size.
HORIZONTAL FURNACE FILTER TABLE
14
HORIZONTAL
FURNACE INPUT
(BTUH)
50,000
75,000
100,000
125,000
•
REMOVE THE FILTER FOR CLEANING AS FOLLOWS:
1. Turn off electrical supply to the furnace. (See Fig. 14.)
2. Remove blower access door located at the inlet (return-air)
end of the furnace (4 screws must be removed).
(See Fig. 16.)
15
3. Bend the formed wire filter retainer to clear the furnace
flange at 1 side.
4. Pivot the filter retainer toward the blower. (See Fig. 17.)
5. Remove the filter from the furnace.
6. Inspect the filter. If torn, replace it.
7. Wash the filter (if dirty) in a sink, bathtub, or outside with a
garden hose. Always use cold tap water. A mild liquid de-
tergent may be used if necessary. Spray water through the
filter in the opposite direction of airflow through the cross-
mesh binding side. Allow filter to dry.
6
CAUTION
!
CAUTION
!
FILTER
SIZE FILTER
(IN.) TYPE
(1) 13 x 23 x 1/2 Cleanable
(1) 13 x 23 x 1/2 Cleanable
(1) 16-1/2 x 23 x 1/2 Cleanable
(1) 20 x 23 x 1/2 Cleanable
16