Thermostatic Fan Control, 2-Pipe Systems — The thermo- stat cycles the fan on and off from any selected speed setting to maintain selected room temperature. Controls can be wired for heating-only, cooling-only or for heating/cooling by the addi- tion of an automatic changeover device that senses water tem- perature and changes the action of the thermostat as required. See Fig. 51.

Thermostatic Fan Control, 2-Pipe System with Safety Cycle — This control is used for high humidity situations in which condensate problems can occur if fan is turned off while chilled water is still running through the coil.

The wiring provides fan cycling from HIGH to LOW on the cooling cycle and from LOW to OFF on the heating cycle. An ON-OFF toggle switch replaces the standard 3-speed fan switch. The toggle switch can be concealed to ensure that the unit runs on low speed when cooling. This action greatly reduces the chance of condensation problems that exist with other standard fan cycling controls. See Fig. 52.

NOTES:

1.Motors are thermally protected.

2.Use copper conductors only.

3.See unit nameplate for power supply. Provide disconnect means and overload protection as required.

4.Unit-mounted thermostats are not recommended for fan control because of poor temperature sensing. Fan control not available on 42VC,VE lowboy units.

Fig. 51 — Thermostatic Fan Control

(2-Pipe System)

NOTES:

1.Motors are thermally protected.

2.Use copper conductors only.

3.See unit nameplate for power supply. Provide disconnect means and overload protection as required.

Fig. 52 — Thermostatic Fan Control (2-Pipe System with Safety Cycle)

Thermostatic Electric Valve Control, 2-Pipe — A thermo- statically controlled 2-position valve provides superior control to fan cycling. With this control, the fan runs continuously un- less it is manually switched to the OFF position. The fan must be on before the valve can be opened to supply water to the coil.

This system can be used for normal 2-pipe changeover systems and can also be furnished for cooling-only or heating- only applications by omitting the changeover and specifying which application is intended. See Fig. 53 and 54 for line volt- age control. See Fig. 55 and 56 for 24-v control.

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Carrier 42C, 42S, 42D, 42V specifications Thermostatic Fan Control Pipe System
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42V, 42D, 42S, 42C specifications

Carrier has established itself as a leader in the HVAC industry by continuously innovating and refining their products. Among their offerings, the Carrier 42D, 42C, 42S, and 42V series stand out for their advanced features, efficient technologies, and user-friendly characteristics.

The Carrier 42D series is known for its robust and energy-efficient design, making it ideal for commercial applications. This series employs a high-performance scroll compressor that enhances efficiency while minimizing noise levels. Equipped with advanced controls, the 42D allows for precise temperature management, ensuring comfort in a variety of environments. Its compact design is another notable feature, allowing for easier installation in constrained spaces while still delivering excellent performance.

Similar to the 42D, the 42C series emphasizes energy efficiency, but it comes with additional features tailored for residential applications. One of the main highlights is its variable-speed compressor technology, which provides exceptional temperature control and reduces energy consumption. This series also includes enhanced filtration systems, ensuring cleaner air quality, which is particularly important for allergy sufferers. Moreover, the 42C's intelligent control systems simplify operation and allow users to customize settings according to their preferences.

The Carrier 42S series focuses on environmentally friendly refrigerants, aligning with global sustainability trends. This series utilizes R-410A refrigerant, which has a lower impact on the ozone layer compared to traditional refrigerants. In addition to its eco-friendly attributes, the 42S boasts features such as an integrated humidity control system, which modulates humidity levels effectively, improving overall indoor air quality.

Finally, the 42V series presents a versatile solution for customers looking for advanced technology and adaptability. With smart connectivity features, the 42V allows for remote monitoring and control via mobile apps, enhancing user convenience. This series is also equipped with a state-of-the-art inverter compressor, which adjusts its speed according to the heating or cooling demand, resulting in significant energy savings.

In summary, the Carrier 42D, 42C, 42S, and 42V series each offer unique features and technological advancements that cater to the diverse needs of users in both residential and commercial settings. With a focus on energy efficiency, user-friendly controls, and environmentally sustainable practices, Carrier continues to set the standard in HVAC solutions.
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