Carrier 58CTA/CTX User Manual download pdf (Page 28)

The Chimney Adapter Kit is a listed alternative venting system

for these furnaces. See the kit instructions for complete details.

Canada (and U.S.A.)--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 in

(24516 mm

require fur-

nace 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 Fig. 34 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 re-

lined with a listed metal liner, Type--B vent, or a listed

chimney adapterkitshall be used to reduce condensation.

If a condensate drain is required by local code, refer to

theNFPA 54 / ANSI Z223.1--2006, Section 12.10 for ad-

ditional 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

condition, shall be rebuilt to conform to ANSI/NFPA 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 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

VENT HEIGHT

FT. (M)

INTERNAL AREA OF CHIMNEY

SQ. IN. (SQ. MM)

(7741)

(12258)

(18064)

(24516)

6 (1.8) 74 119 178 257

8 (2.4) 80 130 193 279

10 (3.) 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

Table 9 – Minimum Allowable Input Rating of Space-- Heat-

ing Appliance in Thousands of BTUH per Hour

VENT HEIGHT

(FT)

INTERNAL AREA OF CHIMNEY

SQ. IN. (SQ. MM)

(7741)

(12258)

(18064)

(24516)

Local 99% Winter Design

Temperature: 17 to 26_F ( --- 8 t o --- 3 _C)

6 (1.8) 0 55 99 141

8 (2.4) 52 74 111 154

10 (3.0) NR 90 125 169

15 (4.6) NR NR 167 212

20 (6.1) NR NR 212 258

30 (9.1) NR NR NR 362

Local 99% Winter Design

Temperature: 5 to 1 6 _F * ( --- 1 5 t o --- 9 _C)

6 (1.8) NR 78 121 166

8 (2.4) NR 94 135 182

10 (3.0) NR 111 149 198

15 (4.6) NR NR 193 247

20 (6.1) NR NR NR 293

30 (9.1) NR NR NR 377

Local 99% Winter Design

Temperature: ---10 to 4_F * ( --- 2 3 t o --- 1 6 _C)

6 (1.8) NR NR 145 196

8 (2.4) NR NR 159 213

10 (3.0) NR NR 175 231

15 (4.6) NR NR NR 283

20 (6.1) NR NR NR 333

30 (9.1) NR NR NR NR

Local 99% Winter Design

Temperature: ---11_F ( --- 2 4 _C) or lower

Not recommended for any vent configuration.

*The 99.6% heating db temperatures fou nd in the 1997 or 2001 ASHRAE

Fundamentals Handbook, Climatic Design Information chapter, Table 1A

(United S tates) and 2A (Canada) or the 2005 ASHRAE Fundamentals

handbook, Climatic Design Information chapter, and the CD---ROM in-

cluded with the 2005 ASHRAE Fundamentals Han dbook.

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% 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

over--sizing 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(15_C)

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.

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