Field Wire Routing

NOTES:

1.Switches shown in high enthalpy state. Terminals 2 and 3 close on enthalpy decrease.

2.When standard economizer is used with accessory differential en- thalpy sensor, set enthalpy control to ``D'' setting.

Fig. 14 Ð Wiring Connections for Solid-State

Enthalpy Sensor (HH57AC077)

Fig. 15 Ð Mixed-Air Thermistor and Economizer

Position Setting Adjustments

(Top of Economizer Motor)

UNIT SIZES 034 AND 044 Ð Field wiring can be brought into the unit through the basepan and roof curb or through the corner post in the side of the unit next to the control box.

A 3-1/2 in. NPT coupling for ®eld power and a 3/4-in. NPT coupling for 24 v control wiring are provided in the basepan. There are two 4-5/8 in. knockouts in the corner post for ®eld power wiring.

If ®eld power wiring is brought through the roof curb, route wiring out through one of the 4-5/8 in. knockouts to the ®eld- supplied disconnect and then back into the unit through the other knockout. See Fig. 16 for recommended disconnect location.

If power wiring is brought through the side of the unit, route wiring from ®eld-supplied disconnect through top 4-5/8 in. knockouts into unit.

If control wiring is to be brought in through the side of the unit, a 7/8-in. diameter hole must be drilled in the corner post next to the control box.

UNIT SIZES 054-074 Ð Field wiring is brought into the unit through the bottom of the control box. Wiring can be brought through the roof curb through ®eld-supplied water- tight connections. See Fig. 17.

A 4-5/32 in. hole for ®eld power wiring and a 7/8-in. hole for 24 v control wiring are provided in the bottom of the control box. Field-supplied couplings must be used when rout- ing wiring into the control box.

See Fig. 17 for recommended disconnect location.

Field Electrical Connections

IMPORTANT: The 48/50DK,DY,NB,NP units gener- ate, use, and can radiate radio frequency energy. If units are not installed and used in accordance with these instructions, they may cause radio interference. They have been tested and found to comply with limits of a Class A computing device as de®ned by FCC (Federal Communications Commission) regulations, Subpart J of Part 15, which are designed to provide reasonable protection against such interference when operated in a commercial environment.

Use care when drilling into corner post to avoid damage to con- denser coil.

Fig. 16 Ð Disconnect Location, 034 and 044 Units

(50 Series Vertical Discharge Unit Shown)

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.