Sears 8MPL125J20B1, 8MPN150J20B1 Exterior Masonry Chimney, FAN+NAT Installations with, Nfpa & AGA

Exterior Masonry Chimney,

FAN+NAT Installations with

Type-B Double-Wall Vent Connectors

© NFPA & AGA

Table A-

Combined Appliance

Maximum Input Rating in

Thousands of Btu per Hr

VENT		INTERNAL	AREA OF CHIMNEY
HEIGHT			(SQ IN,)
(FT)	12	19	28	38
6	74	119	178	257
8	80	130	193	279
10	84	138	207	299
15	NR	152	233	334
20	NR	NR	250	368
30	NR	NR	NR	404

Table B-

Minimum Allowable Input Rating of

Space-Heating Appliance in

Thousands of Btu per Hr

VENT				INTERNAL		AREA	OF CHIMNEY
HEIGHT						(SQ	IN.)
(FT)		12			19		28		38
		Local	99%	Winter	Design		Temperature:	17 to 26 ° F*
	6	0			55		99		141
[o	8	52			74		111		154
o	10	NR			90		125		169
	is	NR			NR		167		212
	2O	NR			NR		212		258
	30	NR			NR		NR		362
		Local	99%	Winter	Design		Temperature:	5 to	16° F*
	6	NR			78		121		166
	8	NR			94		135		182
'-	10	NR			111		149		198
0
	15	NR			NR		193		247
	2O	NR			NR		NR		293
	30	NR			NR		NR		377
		Local	99%	Winter	Design		Temperature:	-10	to 4° F*
	6	NR			NR		145		196
	8	NR			NR		159		213
o	10	NR			NR		175		231
_	is	NR			NR		NR		283
i	20	NR			NR		NR		333
	30	NR			NR		NR		NR
-11 ° F		Local	99% Winter		Design		Temperature:	-11 ° F or
	or					lower*
	lower	Not recommended				for any vent configuration

*The 99% Winter Design Dry-Bulb (db) temperatures are found in the 1993 ASHRAE Fundamentals Handbook, Chapter 24, Table I (United States) and 2 (Canada), or use the 99.6% heating db

temperaturesfound in the 1997 or 2001 ASHRAE Fundamentals Handbook, Climatic Design Information chapter, Table 1A (United States) and 2A (Canada).

Inspections before the sale and at the time of installation will deter-

mine the acceptability of the chimney or the need for repair and/or

(re)lining. Refer to the Chimney Inspection Chart to perform a chimney in_._..pection.

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 to reduce condensation. If a condensate drain is required by local code, refer to the NFGC, Section 10.9 for additional information on condensate drains.

b.Indicates the chimney exceeds the maximum permissible size in the tables, the chimney should be rebuilt or relined to

conform to the requirements of the equipment being installed and the authority having jurisdiction.

A chimney without a clay tile liner, which is otherwise in good con- dition, shall be rebuilt to conform to ANSI/N FPA 211 or be lined with a UL listed (ULC listed in Canada) metal liner or UL listed Type-B vent. Relining with a listed metal liner or Type-B vent is consid- ered 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.

APPLIANCE APPLICATION REQUIREMENTS

Appliance operation has a significant impact on the performance of the venting system. If the appliances are sized, installed, ad- justed, and operated properly, the venting system and/or the ap-

pliances 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 Condi- tioning Contractors of America (Manual J); American Society of

Heating, Refrigerating, and Air-Conditioning Engineers; or other

approved engineering methods. Excessive oversizing of the fur- nace could cause the furnace and/or vent to fail prematurely.

When a metal vent or metal liner is used, the vent or liner must be in

good condition and be installed in accordance with the vent or liner

manufacturer's instructions.

To prevent condensation in the furnace and vent system, the fol-

lowing 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 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, ca us-

ing condensation and corrosion in the furnace and/or vent-

ing system. Derating is permitted only for altitudes above 2000'1

3.Adjust the air temperature rise to the midpoint of the rise

range or slightly above. Low air temperature rise ca n ca use

low vent gas temperature and potential for condensation problems.

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

Air for combustion must not be contaminated by halogen com- pounds which include chlorides, fluorides, bromides, and iodides.

These compounds are found in many common home products

such as detergent, paint, glue, aerosol spray, bleach, cleaning sol- vent, salt, and air freshener, and can cause corrosion of furnaces

and vents. Avoid using such products in the combustion-air sup-

ply. Furnace use during construction of the building could cause the furnace to be exposed to halogen compounds, causing prema-

ture failure of the furnace or ventincj_stem due to corrosion.

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