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

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Carrier NP034-074 specifications Installing Flue/Inlet Hoods 48 Series Units Only, Gas Piping Details
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NP034-074 specifications

The Carrier NP034-074 is an advanced rooftop unit designed for commercial heating, ventilation, and air conditioning (HVAC) applications. This unit is part of Carrier’s extensive range of rooftop units that are known for their energy efficiency, reliability, and innovative features. The NP034-074 series is particularly recognized for its robust performance in diverse environmental conditions, making it ideal for a variety of commercial building types.

One of the standout features of the NP034-074 is its high-efficiency compressor. Equipped with a scroll compressor, the unit offers enhanced performance and quieter operation compared to traditional reciprocating compressors. This design not only improves energy efficiency but also reduces operating costs over time. The unit is designed to meet or exceed the latest efficiency standards, ensuring that businesses can enjoy optimal indoor comfort while keeping energy consumption low.

The NP034-074 also integrates advanced control technologies that provide users with greater flexibility and ease of operation. The intuitive control system allows for precise temperature management and can be easily integrated with building automation systems. This enables users to monitor and adjust settings remotely, ensuring consistent and efficient climate control throughout the facility.

Another key characteristic of the NP034-074 is its robust construction. Built to withstand various weather conditions, the unit features a galvanized steel cabinet with a powder-coated finish for corrosion resistance. Its design also facilitates easy access for maintenance and service, which minimizes downtime and operational interruptions.

In terms of air distribution, the NP034-074 incorporates a powerful blower system that ensures even and effective airflow throughout the space. This design improves indoor air quality by enhancing ventilation while maintaining comfort levels. Additionally, the unit can be customized with options such as economizers and variable speed fans to optimize performance based on specific building needs.

The NP034-074 is a versatile and reliable choice for businesses looking to enhance their HVAC systems. With its combination of energy efficiency, advanced technology, and robust construction, this rooftop unit stands out as a top choice for commercial climate control solutions.
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