SYSTEM-POWERED APPLICATIONS

Constant Volume (CV) Cooling Ð (Function No. 1.) This is the most basic operating con®guration. The control arrange- ment consists of the volume controller and the ®lter. The unit maintains a steady ¯ow of primary air at the quantity set on the volume controller over a range of supply pressures. Fig- ure 43 shows constant volume controls mounted on the Modu- line unit.

CV Heating (Function No. 1.) Constant volume heating con- trols are the same as for CV cooling.

Variable Air Volume (VAV) Cooling Ð (Function No. 2 and 3.) The addition of a cooling thermostat to the constant vol- ume controls allows the unit to vary the ¯ow of primary air. The unit will provide just enough air¯ow to satisfy the ther- mostat setting at existing load conditions, up to the maxi- mum ¯ow set on the volume controller. The cooling thermo- stat is direct acting (DA); thus the branch pressure output from the thermostat increases as the space temperature in- creases. Both diffuser-mounted and wall-mounted variations are available. Figure 44 shows the system-powered VAV con- trols (with diffuser thermostat) mounted on the unit.

VAV Cooling With Warm-Up Ð (Function 4.) During an ex- tended off period (overnight or during a holiday), the space temperature will often be lowered. It is necessary to provide heated air, temporarily, to reestablish comfortable tempera- tures when occupancy resumes. Since the cooling thermo- stats are satis®ed at the reduced temperature, the units will be shut off and the system will not be able to deliver warm air. It is necessary, therefore, to provide a means of tempo- rarily overriding the cooling thermostat. System-powered warm-up is achieved by adding a warm-up switch to the VAV cooling control arrangement (Fig. 45). The warm-up switch, located inside the unit plenum, closes when it senses that warm air is being supplied to the unit. This causes the bel- lows to bleed, opening the unit. This condition is maintained until cool air is returned to the system and the warm-up switch, sensing cool supply air, returns control to the thermostat.

Where all Moduline units on a main duct-run are pro- vided with thermostats for variable air volume control, it is often difficult to get warm air to the end units on a run; with the units in shutoff there is no signi®cant ¯ow which will trigger the warm-up switch. Solutions to this situation are found on page 58 in the Control Operating Sequences, VAV Cooling with Warm-Up section.

Fig. 43 Ð Constant Volume Control

Arrangement

Fig. 45 Ð VAV Control Arrangement for

System-Powered Warm-Up

Fig. 44 Ð Variable Air Volume Control

Arrangement

47

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Carrier 37HS specifications Constant Volume Control Arrangement
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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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