Supply Air Temperature (SAT) Sensor —

On FIOP-equipped 48HC unit, the unit is supplied with a supply-air temperature (SAT) sensor (33ZCSENSAT). This sensor is a tubular probe type, approx 6-inches (12.7 mm) in length. It is a nominal 10-k ohm thermistor.

The SAT is factory-wired. The SAT probe is mounted in the fan deck (see Fig. 40). It can be removed or remounted per local codes.. Drill or punch a 1/2-in. hole in the flange or duct. Use two field-supplied, self-drilling screws to secure the sensor probe in a horizontal orientation. Insure that the sensor wires do not contact the hot surface of the heat exchanger.

SUPPLY AIR

ROOF

TEMPERATURE

CURB

SENSOR

 

SUPPLY AIR

RETURN AIR

 

C10733

Fig. 40 - Mounting Location for Supply Air Temperature (SAT) Sensor on 48HC Units

NOTE: Refer to Form 33CS-67SI for complete PremierLink configuration, operating sequences and troubleshooting information. Have a copy of this manual available at unit start-up.

NOTE: The sensor must be mounted in the discharge airstream downstream of the cooling coil and any heating devices. Be sure the probe tip does not come in contact with any of the unit’s heater surfaces.

Outdoor Air Temperature (OAT) Sensor —

The OAT is factory-mounted in the EconoMi$er2 (FIOP or accessory). It is a nominal 10k ohm thermistor attached to an eyelet mounting ring.

EconoMi$er2 —

The PremierLink control is used with EconoMi$er2 (option or accessory) for outdoor air management. The damper position is controlled directly by the PremierLink control; EconoMi$er2 has no internal logic device.

Outdoor air management functions can be enhanced with field-installation of these accessory control devices:

Enthalpy control (outdoor air or differential sensors) Space CO2 sensor

Outdoor air CO2 sensor

Refer to Table 4 for accessory part numbers.

Field Connections

Field connections for accessory sensor and input devices are made at the 16-pole terminal block (TB3, see Fig. 38 and Fig. 39) located on the control box top shelf in front of the PremierLink control. Some input devices also require a 24-vac signal source; connect at CTB terminal R at “THERMOSTAT” connection strip for this signal source. See connections figures on following pages for field connection locations (and for continued connections at the PremierLink board inputs).

Table 5 provides a summary of field connections for units equipped with Space Sensor. Table 6 provides a summary of field connections for units equipped with Space Thermostat.

48HC

Table 4 – PremierLink Sensor Usage

APPLICATION

OUTDOOR AIR

RETURN AIR

OUTDOOR AIR

RETURN AIR

TEMPERATURE

TEMPERATURE

ENTHALPY SENSOR

ENTHALPY SENSOR

 

 

 

SENSOR

SENSOR

 

 

 

 

 

 

 

 

 

 

Differential Dry Bulb

 

Required ---

 

 

Temperature with

Included ---

 

 

PremierLink

33ZCT55SPT

---

---

CRTEMPSN001A00

(PremierLink requires

or equivalent

 

 

 

 

 

4---20 mA Actuator)

 

 

 

 

 

 

 

 

 

Single Enthalpy with

Included ---

 

Requires ---

 

PremierLink

---

---

(PremierLink requires

Not Used

33CSENTHSW

 

 

4---20mA Actuator)

 

 

 

 

 

 

 

 

 

Differential Enthalpy

Included ---

 

Requires ---

Requires ---

with PremierLink

---

33CSENTHSW

33CSENTSEN

(PremierLink requires

Not Used

 

or equivalent

or equivalent

4---20mA Actuator)

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTES:

 

 

 

 

 

 

CO2 Sensors (Optional):

 

 

 

 

33ZCSENCO2

---

Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.

 

33ZCASPCO2

---

Aspirator box used for duct--- mounted CO2 room sensor.

 

 

33ZCT55CO2

---

Space temperature and CO2 room sensor with override.

 

 

33ZCT56CO2

---

Space temperature and CO2 room sensor with override and setpoint.

 

29

Page 29
Image 29
Carrier 48HC Field Connections, Supply Air Temperature SAT Sensor, EconoMi$er2, PremierLink Sensor Usage

48HC specifications

The Carrier 48HC is a highly efficient rooftop HVAC unit designed for commercial applications that prioritize both performance and energy savings. This unit embodies Carrier's commitment to innovation by integrating advanced technologies and features that address the modern demands of building climate control.

One of the standout features of the Carrier 48HC is its exceptional energy efficiency. Employing the latest in variable-speed compressor technology, the unit adjusts its output based on the specific cooling needs of the space, which not only enhances comfort levels but also significantly reduces energy consumption. This feature is crucial for businesses looking to lower their operational costs while minimizing their environmental impact.

The Carrier 48HC is also equipped with a comprehensive range of control options. Through its intelligent control systems, users can utilize features such as demand ventilation, which optimizes indoor air quality while maintaining energy efficiency. The integration with building management systems (BMS) further enhances operational effectiveness, allowing real-time monitoring and adjustments from a centralized point.

Additionally, the 48HC is designed with durability in mind. Its robust construction resists harsh weather conditions and ensures long-lasting performance. The unit features advanced corrosion-resistant materials and coatings, which prolong its lifespan and reduce maintenance needs. This durability makes the 48HC a reliable choice for varying environments, whether it’s an industrial setting or a more delicate commercial space.

The unit’s compact design also deserves mention, as it facilitates easier installation on rooftops without taking up excessive space. The modular design allows for customization, enabling businesses to tailor their systems to fit specific heating and cooling requirements.

In terms of comfort, the Carrier 48HC employs efficient air distribution technology that ensures even airflow throughout the space. This greatly enhances occupant comfort by eliminating hot or cold spots, promoting a consistent indoor climate.

Finally, the 48HC complies with stringent environmental regulations and standards. With options for environmentally-friendly refrigerants, it supports businesses in their sustainability efforts while operating effectively under current regulations.

In summary, the Carrier 48HC stands out in the crowded HVAC market due to its advanced technology, energy efficiency, durability, and adaptability for commercial applications, making it a top choice for those looking to invest in a reliable and effective climate control solution.