Carrier NP034-074 Installing Flue/Inlet Hoods 48 Series 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. 21. 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 (48 Series Units Only)

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

UNIT SIZES 034 AND 044 Ð The 48 series units have 2 inlet hoods, 2 ¯ue hoods, and 2 ¯ue de¯ector hoods. See Fig. 22. The 48 series low-heat units have one inlet hood, one ¯ue hood and one ¯ue de¯ector hood.

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

Fig. 21 Ð Gas Piping Details

FLUE HOOD AND

FLUE DEFLECTOR

HOOD (48 SERIES

HIGH-HEAT ONLY)

INLET HOOD

(48 SERIES HIGH-

HEAT ONLY)

FLUE HOOD AND

DEFLECTOR

HOOD

INLET HOOD

Fig. 22 Ð Flue/Inlet Hood, 034,044 Units

Remove shipping block-offs and shipping tape from open- ings in access panel. Inlet hoods are shipped unassembled and must be assembled in place. See Fig. 23. The inlet hood consists of a hood, 2 side plates, and an inlet screen.

Install inlet hoods using screws provided.

NOTE: Hoods must be assembled in place on the access panel. Flanges on hood and side plates go to the inside of the ac- cess panel.

Install inlet screen on each inlet hood using speed clips and screws provided. Attach ¯ue hoods (see Fig. 24) to ac- cess panel using screws provided. Hoods go over each com- bustion air outlet.

Sub-assemble ¯ue de¯ector baffle inside the ¯ue de¯ector hood as shown in Fig. 25 and 26. Flue de¯ector baffle must be assembled and installed on the access panel so that the holes in the mounting ¯ange are at the bottom. Install ¯ue de¯ector hood over ¯ue hoods. Be sure that de¯ector scoop is pointed up.

UNIT SIZES 054-074 Ð The 48 series high-heat units have 2 large inlet hoods, 2 small inlet hoods, 3 ¯ue hoods, and 3 ¯ue de¯ector hoods. See Fig. 27 and 28. The 48 series low-heat units have one large inlet hood, 2 small inlet hoods, 2 ¯ue hoods, and 2 ¯ue de¯ector hoods. (See Fig. 27 and 28).

Remove shipping block-offs and shipping tape from open- ings in access panels. Inlet hoods are shipped unassembled and must be assembled in place. See Fig. 23. Inlet hoods consist of a hood, 2 side plates, and an inlet screen.

Install large and small inlet hoods using screws provided.

NOTE: Hoods must be assembled in place on the access panel. Flanges on hood and side plates go to the inside of the ac- cess panel.

Install inlet screen in each inlet hood using speed clips and screws provided. Attach ¯ue hoods (see Fig. 24) to ac- cess panel using screws provided. Hoods go over each com- bustion air outlet.

Sub-assemble ¯ue de¯ector baffle inside ¯ue de¯ector hood as shown in Fig. 29. Install ¯ue de¯ector hoods over ¯ue hoods. (See Fig. 27.)

NOTE: Be sure de¯ector hoods are installed as shown and not upside down. The holes in the mounting ¯ange must be at the bottom when installed on access panel.

INLET HOOD

INLET HOOD

SIDE PLATE (TYP EACH SIDE)

Fig. 23 Ð Inlet Hood

36