Bryant 315AAV Masonry Chimney Requirement, Combined Appliance Maximum Input, Burn Hazard

Masonry Chimney Requirement

NOTE: These furnaces are CSA design-certified for use in exterior tile-lined masonry chimneys with a factory accessory Chimney Adapter Kit. Refer to the furnace rating plate for correct kit usage. The Chimney Adapter Kits are for use with ONLY furnaces having a Chimney Adapter Kit number marked on the furnace rating plate.

If a clay tile-lined masonry chimney is being used and it is exposed to the outdoors below the roof line, relining might be required. Chimneys shall conform to the Standard for Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances ANSI/NFPA 211-2009 in the United States and must be in good condition.

U.S.A.-Refer to Sections 13.1.8 and 13.2.20 of the NFPA 54/ANSI Z223.1-2009 or the authority having jurisdiction to determine whether relining is required. If relining is required, use a properly sized listed metal liner, Type-B vent, or a listed alternative venting design.

NOTE: See the NFPA 54/ANSI Z223.1-2009 13.1.9 and

13.2.20regarding alternative venting design and the exception, which cover installations such as our Chimney Adapter Kits which are listed for use with these furnaces. See Table 17 for accessory listing.

The Chimney Adapter Kit is a listed alternative venting system for these furnaces. See the kit instructions for complete details.

This furnace is permitted to be vented into a clay tile-lined masonry chimney that is exposed to the outdoors below the roof line, provided:

1.Vent connector is Type-B double-wall, and

2.This furnace is common vented with at least 1 draft hood equipped appliance, and

3.The combined appliance input rating is less than the max- imum capacity given in Table 8, and

4.The input rating of each space heating appliance is greater than the minimum input rating given in Table 9 for the local 99% Winter Design Temperature. Chimneys having internal areas greater than 38 sq. in. (24516 sq. mm) re- quire furnace input ratings greater than the input ratings of these furnaces. See footnote at bottom of Table 9, and

5.The authority having jurisdiction approves.

If all of these conditions cannot be met, an alternative venting design shall be used, such as the listed chimney adapter kit with a furnace listed for use with the kit, a listed chimney-lining system, or a Type-B common vent.

Inspections before the sale and at the time of installation will determine the acceptability of the chimney or the need for repair and/or (re)lining. Refer to the Fig. 33 to perform a chimney inspection. If the inspection of a previously used tile-lined chimney:

a.Shows signs of vent gas condensation, the chimney should be relined in accordance with local codes and the authority having jurisdiction. The chimney should be relined with a listed metal liner, Type-B vent, or a listed chimney adapter kit shall be used to reduce con- densation. If a condensate drain is required by local code, refer to the NFPA 54/ANSI Z223.1-2009, Sec- tion 12.10 for additional information on condensate drains.

b.Indicates the chimney exceeds the maximum permiss- ible size in the tables, the chimney should be rebuilt or relined to conform to the requirements of the equip- ment being installed and the authority having jurisdic- tion.

A chimney without a clay tile liner, which is otherwise in good condition, shall be rebuilt to conform to ANSI/NFPA 211 or be lined with a UL listed metal liner or UL listed Type-B vent.

Relining with a listed metal liner or Type-B vent is considered to be a vent-in-a-chase.

If a metal liner or Type-B vent is used to line a chimney, no other appliance shall be vented into the annular space between the chimney and the metal liner.

Exterior Masonry Chimney FAN + NAT Installations with Type-B Double-Wall Vent Connectors ENFPA & AGA

Table 8 – Combined Appliance Maximum Input

Rating in Thousands of Btuh per Hour

		INTERNAL AREA OF CHIMNEY
VENT HEIGHT			SQ. IN. (SQ. MM)
FT (M)
	12		19	28	38
	(7741)		(12258)	(18064)	(24516)
6 (1.8)	74		119	178	257
8 (2.4)	80		130	193	279
10 (3.0)	84		138	207	299
15 (4.5)	NR		152	233	334
20 (6.0)	NR		NR	250	368
30 (9.1)	NR		NR	NR	404

Appliance Application Requirements

Appliance operation has a significant impact on the performance of the venting system. If the appliances are sized, installed, adjusted, and operated properly, the venting system and/or the appliances should not suffer from condensation and corrosion. The venting system and all appliances shall be installed in accordance with applicable listings, standards, and codes.

The furnace should be sized to provide 100 percent of the design heating load requirement plus any margin that occurs because of furnace model size capacity increments. Heating load estimates can be made using approved methods available from Air Conditioning Contractors of America (Manual J); American Society of Heating, Refrigerating, and Air-Conditioning Engineers; or other approved engineering methods. Excessive oversizing of the furnace could cause the furnace and/or vent to fail prematurely.

When a metal vent or metal liner is used, the vent must be in good condition and be installed in accordance with the vent manufacturer’s instructions.

To prevent condensation in the furnace and vent system, the following precautions must be observed:

1.The return-air temperature must be at least 60_F db except for brief periods of time during warm-up from setback at no lower than 55_F (13_C) db or during initial start-up from a standby condition.

2.Adjust the gas input rate per the installation instructions. Low gas input rate causes low vent gas temperatures, caus- ing condensation and corrosion in the furnace and/or vent- ing system. Derating is permitted only for altitudes above 2000 Ft. (610 M).

3.Adjust the air temperature rise to the midpoint of the rise range or slightly above. Low air temperature rise can cause low vent gas temperature and potential for condensation problems.

4.Set the thermostat heat anticipator or cycle rate to reduce short cycling.

!CAUTION

BURN HAZARD

Failure to follow this caution may result in personal injury.

Hot vent pipe is within reach of small children when installed in downflow position.

See the following instruction.

315AAV

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