Carrier 58CTA/CTX User Manual download pdf (Page 19)

Gas piping must be installed in accordance with national and

local codes. Refer to current edition of NFGC in the U.S. and the

CAN/CSA--B149.1--05 in Canada.

Table 6 – Maximum Capacity of Pipe

NOMINAL

IRON PIPE

SIZE

IN. (MM)

INTERNAL

DIA.

IN. (MM)

LENGTH OF PIPE --- FT. (M)

(3.0)

(6.0)

(9.1)

(12.1)

(15.2)

1/2 (12.7)

0.622

(158)

175 120 97 82 73

3/4 (19.0)

0.824

(20.9)

360 250 200 170 151

1( 25.4)

1.049

(26.6)

680 465 375 320 285

1-1/4

(31.8)

1.380

(35.0)

1400 950 770 660 580

1-1/2

(38.1)

1.610

(40.9)

2100 1460 1180 990 900

* Cubic ft. of natural gas per hr for gas pressures of 0.5 psig (14---in. wc)

or less and a pressure drop of 0.5 ---in. wc (based on a 0.60 specific

gravity gas). Ref: Table 6.2 ANSI Z223---2006/NFPA 54---2006.

Installations must be made in accordance with all authorities

having jurisdiction. If possible, the gas supply line should be a

separate line running directly from meter to furnace.

NOTE: In the state of Massachusetts:

1. Gas supply connections MUST be performed by a li-

censed plumber or gas fitter.

2. When flexible connectors are used, the maximum length

shall not exceed 36 inches (915 mm).

3. When lever handle type manual equipment shutoff valves

are used, they shall be T--handle valves.

4. The use of copper tubing for gas piping is NOT approved

by the state of Massachusetts.

Refer to Table 6 for recommended gas pipe sizing. Risers must be

used to connect to furnace and to meter. Support all gas piping

with appropriate straps, hangers, etc. Use a minimum of 1 hanger

every 6 ft. (1.8 M). Joint compound (pipe dope) should be

applied sparingly and only to male threads of joints. Pipe dope

must be resistant to the action of propane gas.

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal

injury, death, and/or property damage.

If local codes allow the use of a flexible gas appliance

connector, always use a new listed connector. Do not use a

connector which has previously served another gas

appliance. Black iron pipe shall be installed at the furnace

gas control valve and extend a minimum of 2 in. (51 mm)

outside the furnace.

WARNING

FURNACE DAMAGE HAZARD

Failure to follow this caution may result in furnace damage.

Connect gas pipe to furnace using a backup wrench to

avoid damaging gas controls and burner misalignment.

CAUTION

An accessible manual equipment shutoff valve MUST be

installed external to furnace casing and within 6 ft. of furnace. A

1/8--in. (3 mm) NPT plugged tapping, accessible for test gauge

connection, MUST be installed immediately upstream of gas

supply connection to furnace and downstream of manual

equipment shutoff valve.

NOTE: The furnace gas control valve inlet pressure tap

connection is suitable to use as test gauge connection providing

test pressure DOES NOT exceed maximum 0.5 psig (14--in. wc)

stated on gas control valve. (See Fig. 53.) Some installations

require gas entry on right side of furnace (as viewed in upflow).

(See Fig. 21.)

2” (51mm)

Street Elbow

A08551

Fig. 21 -- Burner and Manifold

Install a sediment trap in riser leading to furnace as shown in Fig.

22. Connect a capped nipple into lower end of tee. Capped nipple

should extend below level of furnace gas controls. Place a ground

joint union between furnace gas control valve manifold and

exterior manual equipment gas shutoff valve.

UNION

SEDIMENT

TRAP

MANUAL

SHUTOFF

VALVE

(REQUIRED)

GAS

SUPPLY

A02035

Fig. 22 -- Typical Gas Pipe Arrangement

58CT

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 55 56

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Carrier 58CTA/CTX User Manual Page 19

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