Electrical Connections - Carrier 59MN7B Installation, Start-Up, Operating And Service And Maintenance Instructions

Modulating 4-way multipoise condensing gas furnace

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GAS

SUPPLY

MANUAL

SHUT OFF

VALVE

(REQUIRED)

UNION

SEDIMENT

TRAP

Fig. 30 - - Typical Gas Pipe Arrangement

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. 60.

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.

Gas entry can be from left or right side, or top panel. See Figs. 31

and 32.

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. 31.

FRONT

NOTE: Union may be inside the

vestibule where permitted by

local codes.

A11035

Left Side Gas Entry. Gas Pipe

Grommet Required For Direct

Vent Applications.

Fig. 31 - - Gas Entry

Fig. 32 - - Alternate Gas and Electric Entry

NOTE: Top plate may be field drilled for alternate gas and

115 VAC electric entry.