Filtering Out Trouble; Performing Routine Maintenance - Carrier OIL FURNACE 58CMA User's Information Manual

1. Set thermostat to lowest setting.
(See Fig. 8.)
®
2. Turn off all electrical power to furnace.
(See Fig. 9.)
3. Close oil supply valve. (See Fig. 10.)
4. If applicable, turn off water supply to humidifier.
5. If furnace blower will be necessary for cooling sys-
tem, remember to turn electric power back on when
needed for air conditioning.
6. If furnace is being shut down because of a malfunc-
tion, call your dealer as soon as possible.
ALWAYS KEEP MAIN OIL VALVE TURNED OFF
IF BURNER IS SHUT DOWN FOR AN EXTENDED
PERIOD OF TIME.
PERFORMING ROUTINE
MAINTENANCE
With proper maintenance and care, your furnace will
operate economically and dependably. Instructions for
basic maintenance follow. However, before beginning
maintenance, follow these safety precautions:
WARNING
!
Turn off all electrical power to furnace before
performing any maintenance or service on
unit. Failure to take this precaution may result
in personal injury due to electrical shock.
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Although special care has been taken to mini-
mize sharp edges, be extremely careful when
8
handling parts or reaching into the furnace.

FILTERING OUT TROUBLE

Dirty air filters will cause a loss of airflow in your duct
system. When excessive loss of airflow occurs, the fur-
nace may cycle on its safety controls. If this condition
is left unattended, the furnace will eventually lock out.
It is recommended that furnace air filters be checked
every 3 or 4 weeks and cleaned or replaced as necessary.
Never operate your furnace without the air fil-
ters in place. Doing so may damage the fur-
nace blower motor. An accumulation of dust
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and lint on internal parts of your furnace can
cause a loss of efficiency.
The air filter is installed in an external filter rack which
is provided as standard equipment with furnace. To
inspect, clean, and/or replace air filter, follow these
steps:
1. Turn off electrical supply to furnace. (See Fig. 11.)
2. Remove filter from external filter rack.
3. Inspect filter. If torn, replace it.
NOTE: If filter has been replaced with an electronic
air cleaner (EAC), refer to EAC Owner's Manual for
maintenance information.
4. If filter is dirty, it must be replaced. If your furnace
air filter needs to be replaced, be sure to use the same
size and type of filter that was originally supplied.
Use furnace filter table for filter size and filter rack
flange dimensions for return air duct.
FURNACE AIR FILTER TABLE
FLANGE
OPENING
SIZE
(IN.)
15 X 23
19 X 29
6
CAUTION
!
CAUTION
!
FILTER
SIZE FILTER
(IN.) TYPE
16 X 24 or 25 X 1 Disposable
20 X 30 X 1 Disposable
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