Bryant 315AAV Filter Size Information In. mm, Cleaning Heat Exchanger, Service agency

Table 16 – Filter Size Information - In. (mm)

		FILTER SIZE
FURNACE CASING WIDTH	SIDE			BOTTOM		FILTER TYPE
	RETURN			RETURN
14---1/2 (368)	16 X 25 X 3/4			14 X 25 X 3/4		Washable*
	(406 X 635 X 19)			(356 X 635 X 19)
17---1/2 (445)	16 X 25 X 3/4			16 X 25 X 3/4		Washable*
	(406 X 635 X 19)			(406 X 635 X 19)
21 (533)	16 X 25 X 3/4			20 X 25 X 3/4		Washable*
	(406 X 635 X 19)			(508 X 635 X 19)
24 (610)	16 X 25 X 3/4			24 X 25 X 3/4		Washable*
	(406 X 635 X 19)			(610 X 635 X 19)
* Recommended
The inducer and blower motors are pre-lubricated and require no				15. Reconnect blower leads to furnace control. Refer to fur-
additional lubrication. These motors can be identified by the				nace wiring diagram, and connect thermostat leads if pre-
absence of oil ports on each end of the motor.				viously disconnected.
Clean blower motor and wheel as follows:				16. To check blower for proper rotation:
1. Turn off electrical supply to furnace.				a. Turn on electrical supply.
2. Remove outer door.
			!		WARNING
3. For downflow or horizontal furnaces having vent pipes
within the furnace that pass in front of the blower access
door:
				ELECTRICAL SHOCK HAZARD
a. Disconnect vent connector from furnace vent elbow.				Failure to follow this warning could result in personal
b. Disconnect and remove short piece of vent pipe from				injury, or death.
within furnace.				Blower access door switch opens 115-v power to furnace
4. Remove 2 screws from blower access door and remove
				control. No component operation can occur unless switch is
blower access door.				closed. Exercise caution to avoid electrical shock from
5. All factory wires can be left connected, but field thermo-				exposed electrical components when manually closing this
				switch for service purposes.
stat connections may need to be disconnected depending
on their length and routing.
				b. Manually close blower access door switch.
6. Remove 2 screws holding blower	assembly to blower
			NOTE: If R-W/W1 thermostat terminals are jumpered at the
deck and slide blower assembly out of furnace.
			time blower access door switch is closed, blower will run for 90
7. Clean blower wheel and motor using a vacuum with soft
			sec before beginning a heating cycle.
brush attachment. Blower wheel blades may be cleaned
				c. Perform component self-test as shown at the bottom
with a small paint or flux brush. Do not remove or disturb
				of the SERVICE label, located on the front of blower
balance weights (clips) on blower wheel blades.
				access door.
8. Vacuum any loose dust from blower housing, wheel and
				d. Verify blower is rotating in the correct direction
motor.
				17. If furnace is	operating properly, RELEASE BLOWER
9. If a greasy residue is present on blower wheel, remove
				ACCESS DOOR SWITCH. Remove any jumpers or re-
wheel from the blower housing and wash it with an appro-
				connect any	disconnected thermostat leads. Replace
priate degreaser. To remove wheel:
				blower access door.
NOTE: Before disassembly, mark blower mounting arms, motor,
				18. Downflow or horizontal furnaces with vent pipe through
and blower housing so motor and each arm is positioned at the
				furnace only:
same location during reassembly.
				a. Install and connect short piece of vent pipe inside fur-
a. Disconnect ground wire attached to blower housing.
				nace to existing vent.
b. Remove screws securing cutoff plate and remove
				b. Connect vent connector to vent elbow.
cutoff plate from housing.
				19. Reinstall outer door.
c. Loosen set screw holding blower wheel on motor shaft
				20. Turn on gas supply and cycle furnace through one com-
(160+/-20 in.-lb. when assembling).
				plete heating and cooling cycle. Verify the furnace temper-
d. Remove bolts holding motor to blower housing and
				ature rise as shown in Adjustments Section. Adjust tem-
slide motor out of wheel (40+/-10 in.-lb. when reas-
				perature rise as shown in Adjustments Section. If outdoor
sembling).
				temperature is below 70_F, turn off circuit breaker to out-
e. Remove blower wheel from housing.
				door unit before running furnace in the cooling cycle.
f. Clean wheel and housing.
				Turn outdoor circuit breaker on after completing cooling
10. Reassemble motor and blower by reversing steps 9a,				cycle.
through 9e. Be sure to reattach ground wire to the blower			Cleaning Heat Exchanger
housing.			The following steps should be performed by a qualified
11. Verify that blower wheel is centered in blower housing
			service agency:
and set screw contacts the flat portion of the motor shaft.			NOTE: If the heat exchangers get a heavy accumulation of soot
Loosen set screw on blower wheel and reposition if neces-
			and carbon, they should be replaced rather than trying to clean
sary.
			them thoroughly. A build-up of soot and carbon indicates that a
12. Spin the blower wheel by hand to verify that the wheel
			problem exists which needs to be corrected, such as improper
does not rub on the housing.
			adjustment of manifold pressure, insufficient or poor quality
13. Reinstall blower assembly in furnace.
			combustion air, incorrect size or damaged manifold orifice(s),
14. Reinstall 2 screws securing blower assembly to blower			improper gas, or a restricted heat exchanger. Action must be taken
deck.			to correct the problem.

315AAV

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