Carrier 48MPD, MPE62L-10R Installing Flue/Inlet Hoods 48MP Units Only, Ð Gas Piping Details

Gas Piping (48 Series Units Only) Ð Unit is equipped for use with natural gas only. Installation must conform with local building codes, or in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1.

A 1¤8-in. NPT tapping plug, accessible for test gage con- nection, must be ®eld installed immediately upstream of gas supply connection to unit, but after manual gas valve. See Fig. 34. Natural gas pressure at unit gas connection must not be less than 5 in. wg or greater than 13 in. wg.

Size gas supply piping for 0.5 in. wg maximum pressure drop. Do not use supply pipe smaller than unit gas connection.

Disconnect gas piping from unit when leak testing at pressures greater than 0.5 psig. Pressures greater than

0.5psig will cause gas valve damage resulting in a haz- ardous condition. If gas valve is subjected to pressure greater than 0.5 psig, it must be replaced.

Installing Flue/Inlet Hoods (48MP Units Only)

ÐThe ¯ue/inlet hoods are shipped in a bag taped to the basepan in the gas section of the unit.

UNITS SIZES 62LAND 70M Ð The high heat units (48MPE), have 3 ¯ue hoods, 3 ¯ue de¯ector hoods, and one inlet air hood to be ®eld installed. See Fig. 35. The low heat units (48MPD) have 2 ¯ue hoods, 2 ¯ue de¯ector hoods, and one inlet air hood.

Remove the shipping block offs and shipping tape from the ¯ue openings in the access panel and the corner post. The inlet hood is shipped unassembled and must be as- sembled before mounting to the access panel. See Fig. 36. Install inlet screen on inlet hood using speed clips and screws provided.

Attach the ¯ue hoods to access panel and corner post us- ing screws provided. See Fig. 37. Hoods go over each com- bustion air outlet.

Install the ¯ue de¯ector baffle inside the ¯ue de¯ector hood. See Fig. 38. Install ¯ue de¯ector hoods over each ¯ue hood.

UNIT SIZES 82N, 90P, and 10R Ð The high heat units (48MPE), have 3 ¯ue hoods and 3 ¯ue de¯ector hoods to be ®eld installed. See Fig. 35. The low heat units (48MPD), have 2 ¯ue hoods and 2 ¯ue de¯ector hoods.

Remove the shipping block offs and shipping tape from the ¯ue openings in the access panel and the corner post.

Attach the ¯ue hoods to access panel and corner post us- ing screws provided. See Fig. 37. Hoods go over each com- bustion air outlet.

Install the ¯ue de¯ector baffle inside the ¯ue de¯ector hood. See Fig. 38. Install the ¯ue de¯ector hoods over each ¯ue hood.

*NPT plug is ®eld supplied. NOTE: Follow all local codes.

Fig. 34 Ð Gas Piping Details

INLET HOOD	GAS HEAT
(62L AND 70M	SECTION
SIZES ONLY)	PANEL

FLUE HOOD

AND FLUE

DEFLECTOR

HOOD

HIGH HEAT

UNITS ONLY

Fig. 35 Ð Flue and Inlet Hood Locations

(48MP Units Only)

INLET HOOD

INLET HOOD

SIDE PLATE (TYP EACH SIDE)

Fig. 36 Ð Inlet Hood Assembly

Fig. 37 Ð Flue Hood

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