Bryant 374RAN Performing Routine Maintenance, Filtering OUT Trouble, Furnace AIR Filter Table

2.Turn off all electrical power to the furnace. (See Fig. 9.)

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3.Close oil supply valve. (See Fig. 10).

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4.If applicable, turn off water sup- ply to humidifier.

5.If furnace blower will be neces- sary for cooling system, remem- ber to turn electric power back on when needed for air condi- tioning.

6.If furnace is being shut down be- cause of a malfunction, 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 economi- cally and dependably. Instructions for basic maintenance follow. How- ever, before beginning maintenance, follow these safety precautions:

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal inju- ry or death.

Turn off all electrical power to furnace before performing any maintenance or service on unit.

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!CAUTION

CUT HAZARD

Failure to follow this caution may result in personal injury. Although special care has been taken to minimize sharp edges, be extremely careful when 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 furnace may cycle on its safety controls. If this condition is left unattended, the furnace will even- tually lock out. It is recommended that furnace air filters be checked every 3 or 4 weeks and cleaned or replaced as necessary.

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!CAUTION

UNIT DAMAGE HAZARD Failure to follow this caution may result in reduced unit component life.

Never operate your furnace without the air filters in place. Doing so may damage the furnace blower motor. An ac- cumulation of dust and lint on internal parts of your furnace can cause a loss of efficiency.

The air filter is installed in an ex- ternal 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 fur- nace. (See Fig. 11.)

2.Remove filter from external fil- ter rack.

3.Inspect filter. If torn, replace it.

NOTE: If filter has been replaced with an electronic air cleaner (EAC), refer to the EAC Owner’s Manual for maintenance informa- tion.

4.If filter is dirty, it must be re- placed. If your furnace air filter needs to be replaced, be sure to use the same size and type of fil- ter that was originally supplied. Use furnace filter table for filter size and filter rack flange dimen- sions for return air duct.

FURNACE AIR FILTER TABLE

FLANGE
OPENING	FILTER
SIZE	SIZE	FILTER
(IN.)	(IN.)	TYPE
	Model Size 105
	16 X 24 X 1
15 X 23	or	Disposable
	16 X 25 X 1
	Model Size 120
	18 X 30 X 1
19 X 29	or	Disposable
	20 X 30 X 1

If you have replaced a disposable filter with a permanent washable filter, it may be cleaned if it is dirty.