Variable-Frequency Drives Ð The input signal for the inverter must be 4 to 20 mA. Use a 2-conductor 20 AWG (American Wire Gage) cable (single twisted pair, unshielded) to connect the input of the inverter to the output of the PIC control terminals. See Fig. 8.

Wire the inverter so that if it is placed in the manual or bypass mode the low temperature thermostat and the high- pressure switch (if supplied) are still in the motor control circuit to protect the unit.

Adjust the minimum inverter speed to provide at least 10% air¯ow when inlet guide vanes are at 0% (4 mA) and maxi- mum design air¯ow when inlet guide vanes are at 100% (20 mA). Use the local interface device to verify that the

supply fan status ( ) shows the fan is ON and that the

supply fan is operating at the lowest air¯ow adjustment. In- crease inverter minimum speed as required. For additional information, see the Quick Test section on page 103.

Water Valve Assemblies Ð Water valve assemblies (Fig. 13) are shipped inside the fan section for ®eld instal- lation. All valve assemblies have electrically powered ac- tuators. Each actuator has an external junction box for ®eld wiring. The junction box contains 24 vac power wires (WHITE/ BLUE, BLACK) and 4 to 20 mA signal wires (1RED, −GREEN). The actuators operate the valve through a linear stroke; if power is lost, a return spring reverses the stroke and returns the valve stem to the normal position.

To prevent electric shock and equipment damage, dis- connect the power to the control box before installing valve assemblies. Turn power switch located on control box door to OFF.

On installations where valve mounting space is limited, use unions to couple valve assemblies to water lines. If unions do not provide sufficient clearance, refer to the Valve Troubleshooting section, page 109.

On chilled water applications or hot water applications with 11¤2 to 3-in. valves, the valve actuators can be mounted in any position above the centerline of the valve body. For steam applications or hot water applications with 1¤2 to 11¤4-in. valves that have actuators and high-temperature linkage exten- sions, mount the actuator above the centerline of the valve body and 45 degrees from vertical. This position helps to prevent actuator exposure to direct heat convection.

DO NOT install valve assembly where excessive mois- ture, corrosive fumes, and/or vibration are present.

INSTALL all 2-way valve assemblies so that they close against system ¯ow. An arrow on the valve body indi- cates the proper ¯ow direction.

ALWAYS install 3-way mixing valve with 2 inlet ¯ows and one outlet. Normal ¯ow will be from port B to port AB with stem up. See Fig. 14.

VALVE ACTUATOR

ACTUATOR LINKAGE

VALVE BODY

Fig. 13 Ð Valve Assembly (Typical)

Fig. 14 Ð Three-Way Mixing Valve Ð Normal Flow,

Typical Piping

38

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Carrier 39L specifications Valve Assembly Typical
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39L specifications

The Carrier 39L is a cutting-edge air conditioning unit designed for both residential and commercial applications, providing exceptional cooling and heating performance. Equipped with advanced technologies, this system ensures optimal climate control while maintaining energy efficiency.

One of the standout features of the Carrier 39L is its inverter technology. This innovation allows the system to adjust its compressor speed based on the ambient temperature, which results in a significant reduction in energy consumption. By operating at varying capacities rather than a fixed output, the 39L can maintain a consistent temperature, enhancing comfort while lowering electricity bills.

The Carrier 39L also includes a high-efficiency air filtration system, designed to capture dust, allergens, and other airborne particles. This not only improves indoor air quality but also promotes a healthier living environment. The filtration system is complemented by anti-bacterial treatment, ensuring that the air circulated within your space is both clean and refreshing.

In terms of design, the Carrier 39L boasts a sleek and compact form factor, making it easy to integrate into various settings, from homes to offices. Its quiet operation is another notable feature, as it minimizes noise levels, allowing occupants to enjoy a serene atmosphere without disruptive sound.

Further enhancing convenience, the Carrier 39L comes equipped with smart connectivity options. Users can control the unit remotely via a smartphone app, making it easy to adjust settings, program schedules, and monitor energy usage from anywhere. This feature not only improves user experience but also supports energy-saving practices.

Durability is also a key characteristic of the Carrier 39L. Constructed with high-quality materials and coated with corrosion-resistant treatments, the unit is built to withstand various environmental conditions. This ensures long-lasting performance and reduces the need for frequent maintenance.

Overall, the Carrier 39L is a versatile, efficient, and user-friendly air conditioning solution. Its blend of advanced technologies, energy-saving capabilities, and robust design makes it an ideal choice for those seeking reliable climate control in their spaces. Whether for residential comfort or commercial necessity, the Carrier 39L stands out as a leader in modern air conditioning.
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