VAV Heating and Cooling With Changeover Ð (Function 5.) A VAV control arrangement for cooling/heating includes a wall-mounted cooling/heating thermostat and provision to change the thermostat from cooling to heating con®guration and back again. Figure 46 shows the control arrangement with Moduline control for heating and cooling. The wall thermostat is shown in Fig. 47. The system-powered heating and cooling changeover uses an assembly consisting of 2 temperature-operated pneumatic switches located inside the unit plenum and installed in-line between a cooling/heating thermostat and the volume controller. These switches se- quence the thermostat between the cooling and heating modes, depending upon the temperature of the primary air supply.

VAV Heating Ð (Function 9.) Variable air volume heating controls are the same as for VAV cooling except that only a wall-mounted heating thermostat is offered (Fig. 48). The heating thermostat is reverse acting (RA); thus the output pressure decreases as the space temperature increases.

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Fig. 46 Ð System-Powered Changeover Switch Arrangement with Heating/Cooling Wall Thermostat

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Fig. 47 Ð Cooling/Heating Wall Thermostat

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Fig. 48 Ð Wall-Mounted Heating Thermostat

SYSTEM-POWERED CONTROLS WITH ELECTRIC INTERFACE

VAV Cooling With Electric Warm-Up Ð (Function 6.) Elec- tric warm-up uses an electric changeover valve to perform the same function as system-powered warm-up; that is, to provide heated air to reestablish comfortable temperatures when occupancy resumes after an extended unoccupied pe- riod. Since the cooling thermostats are satis®ed at the re- duced temperature, the units will be shut off and the system will not be able to deliver warm air. It is necessary, there- fore, to provide a means of temporarily overriding the cool- ing thermostat.

The changeover control is an electrically operated, re- motely controlled 3-way solenoid valve. The normally closed port of the valve is capped. The valve usually is wired to activate automatically with the supplemental heating switch; however, it can also be manually activated. This option may be used with either a unit-mounted or wall-mounted ther- mostat. See Fig. 49.

VAV Heating and Cooling With Electric Changeover Ð (Func- tion 7.) A VAV control arrangement for cooling/heating in- cludes a wall-mounted cooling/heating thermostat (Fig. 47) and provision to change the thermostat from a cooling to heating con®guration and back again. System-powered cooling/ heating with electric changeover uses a 3-way electric so- lenoid valve to switch control between the cooling and heat- ing functions of a cooling/heating wall-mounted thermostat. It is installed in-line between the volume controller of a CV cooling control package and the thermostat. The valve may be activated separately or interlocked with an electric heat- ing system. See Fig. 50.

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Fig. 49 Ð VAV Control Arrangement

for Electric Warm-Up

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Fig. 50 Ð VAV Control Arrangement

for Electric Changeover

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Carrier 37HS specifications Cooling/Heating Wall Thermostat
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37HS specifications

The Carrier 37HS is a cutting-edge heating, ventilation, and air conditioning (HVAC) solution designed to deliver exceptional performance and energy efficiency for residential and commercial applications. This unit is particularly favored for its advanced features and reliable operation, making it a popular choice among homeowners and building managers alike.

One of the standout characteristics of the Carrier 37HS is its high Seasonal Energy Efficiency Ratio (SEER), which indicates its ability to provide effective cooling while minimizing energy consumption. This makes it not only cost-effective but also an environmentally-friendly choice, helping to reduce the overall carbon footprint. The unit is equipped with state-of-the-art inverter technology, which allows it to adjust its cooling capacity to match the current demand, thus enhancing comfort while optimizing energy use.

The Carrier 37HS incorporates a high-efficiency scroll compressor that operates quietly and efficiently. This technology enhances the unit's reliability and longer service life while ensuring minimal noise levels during operation, making it suitable for residential settings where tranquility is paramount.

A significant feature of the 37HS is its variable-speed fan system, which enables gradual adjustments in airflow to maintain a consistent and comfortable indoor environment. This not only contributes to enhanced comfort but also reduces wear and tear on the system, further extending its longevity.

Moreover, the Carrier 37HS is designed with advanced air filtration capabilities, utilizing multi-stage filters that capture airborne particles, allergens, and pollutants. This results in improved indoor air quality, making it an ideal choice for those with allergies or respiratory issues.

The unit also boasts user-friendly smart controls, allowing homeowners to monitor and adjust settings remotely via a smartphone app. This feature adds convenience and assists in energy management, ensuring that users can optimize their HVAC system even when they are away from home.

In summary, the Carrier 37HS stands out for its exceptional energy efficiency, quiet operation, advanced technology, superior air filtration, and modern smart controls. These features collectively make it a prime solution for those seeking a reliable HVAC system that delivers both comfort and savings, while also contributing positively to environmental sustainability. Whether for a residential setting or a commercial establishment, the Carrier 37HS is engineered to meet a variety of climate control needs with excellence.
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