Control Operating Sequences

Models: 37HS

System-Powered Controls

CV COOLING Ð See Fig. 54. Air from above the distri- bution baffle (high pressure) enters the ®lter through the up- per port of the control block, while the lower port receives air from below the baffle (low pressure). These air streams pass through separate ®lter chambers where particulate con- taminants are removed.

The low pressure air stream enters the low pressure cham- ber of the volume controller from the top port of the ®lter, while the bottom port of the ®lter feeds the high pressure stream into the controller's high pressure chamber.

Air from the high pressure chamber feeds into the bellows pressure chamber of the controller through the ®xed ori®ce. Pressure in the bellows chamber of the volume controller is determined by the relationship between the entering ¯ow re- sistance of the ®xed ori®ce and the leaving ¯ow resistance of the control valve variable ori®ce.

As the control valve opens, its resistance decreases and relatively more air is allowed to bleed, lowering the pressure in the bellows chamber. As the control valve closes, the ef- fect is reversed, increasing the bellows pressure. This is the principle of control by matched ori®ces.

The control valve is positioned by 2 diaphragms, one in the low pressure chamber and one in the high pressure cham- ber, and an adjustable spring. Pressure above the low pres- sure diaphragm tends to open the control valve while the high pressure diaphragm tends to hold it closed. The spring tension balances these forces as the pressures vary and de- termines the valve position. Rotating the adjusting dial on the volume controller changes the spring tension and pro- vides a means of establishing a ¯ow set point.

The bellows pressure determined by the action of the con- trol valve is communicated to the bellows. As the plenum pressure changes, the control bellows valve is constantly re- set to maintain a corresponding bellows pressure. The bel- lows pressure chamber of the volume controller feeds air back through the middle port and chamber of the ®lter (also called a bellows pressure chamber), to the bellows connection on the unit end panel, and into the bellows. The bellows pres- sure re-sets the bellows on the unit air valve to provide a constant air¯ow through the unit at the value selected on the volume controller dial.

CV HEATING Ð Control arrangements and operation are the same for CV heating as for CV cooling. The controls and their operation are not affected by the temperature of the sup- ply air.

Fig. 54 Ð Constant Volume Controls Ð Controller Bleeding, Unit Supplying Air

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.