Carrier 59MN7A Instruction Manual download pdf (Page 31)

GAS PIPING

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal

injury, death, and/or property damage.

Never purge a gas line into a combustion chamber. Never

test for gas leaks with an open flame. Use a commercially

available soap solution made specifically for the detection

of leaks to check all connections. A fire or explosion may

result causing property damage, personal injury or loss of

life.

WARNING

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal

injury, death, and/or property damage.

Use proper length of pipe to avoid stress on gas control

manifold and gas valve.

WARNING

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal

injury, death, and/or property damage.

Gas valve inlet and/or inlet pipe must remain capped until

gas supply line is permanently installed to protect the valve

from moisture and debris. Also, install a sediment trap in the

gas supply piping at the inlet to the gas valve.

WARNING

Gas piping must be installed in accordance with national and local

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

current edition of NSCNGPIC in Canada.

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: Use a back--up wrench on the inlet of the gas valve when

connecting the gas line to the gas valve.

NOTE: In the state of Massachusetts:

1. Gas supply connections MUST be performed by a licensed

plumber or gas fitter.

2. When flexible connectors are used, the maximum length

shall not exceed 36 in. (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 8 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

A 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. (1.8 M) of furnace.

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

29. 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 and exterior manual

equipment gas shutoff valve.

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.

Piping should be pressure and leak tested in accordance with the

current addition of the NFGC in the United States, local, and

national plumbing and gas codes before the furnace has been

connected. Refer to current edition of NSCNGPIC in Canada.

After all connections have been made, purge lines and check for

leakage at furnace prior to operating furnace.

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. W.C.)

stated on gas control valve. (See Fig. 50.)

If pressure exceeds 0.5 psig (14--In. W.C.), gas supply pipe must be

disconnected from furnace and capped before and during supply

pipe pressure test. If test pressure is equal to or less than 0.5 psig

(14--In. W.C.), turn off electric shutoff switch located on furnace

gas control valve and accessible manual equipment shutoff valve

before and during supply pipe pressure test. After all connections

have been made, purge lines and check for leakage at furnace prior

to operating furnace.

The gas supply pressure shall be within the maximum and

minimum inlet supply pressures marked on the rating plate with

the furnace burners ON and OFF.

Some installations require gas entry on right side of furnace (as

viewed in upflow). (See Fig. 28.)

Gas Pipe Grommet

For direct vent (2-pipe) applications, the knockout for the gas pipe

must be sealed to prevent air leakage. Remove the knockout, install

the grommet in the knockout, then insert the gas pipe. The

grommet is included in the loose parts bag. See Fig. 28.

59MN7A

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Carrier 59MN7A Instruction Manual Page 31

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