Carrier 48HC installation instructions Typical Low-Voltage Control Connections

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Central

Typical

 

 

Terminal

 

 

Board

Thermostat

 

 

Corrections

 

 

 

 

 

X

X

C

 

C

C

G

See

G

G

Caution

W2

 

W2

W2

W1

 

W1

W1

O/B/Y2

 

Y2

Y2

(see Note)

 

 

 

Y1

 

Y1

Y1

R

 

R

R

 

 

T–STAT

Note: Typical multi-function marking. Follow manufacturer’s configuration instructions to select Y2.

Field Wiring

!CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may cause a short circuit.

Carefully check the connection of control coductor for indoor fan control at terminal G. Connecting the indoor fan lead to terminal C will cause a short circuit condition which can cause component damage inside the unit or at thermostat.

C10731

Fig. 30 - Typical Low-Voltage Control Connections

NOTE: If utilizing the through the base connections, route the low voltage wire through the wire ties to the central terminal board.

Rubber

Grommet

Corner

Post

Wire

Ties

Thru the Base

Connection

C10734

Fig. 31 - Field Control Wiring Raceway

Heat Anticipator Settings —

Set heat anticipator settings at 0.14 amp for the first stage and 0.14 amp for second-stage heating.

Transformer Connection for 208-v Power Supply —

All units except 208/230-v units are factory wired for the voltage shown on the nameplate. If the 208/230-v unit is to be connected to a 208-v power supply, the control transformer must be rewired by moving the black wire with the 1/4-in. female spade connector from the 230-v connection and moving it to the 208-v1/4-in. male terminal on the primary side of the transformer. Refer to unit label diagram for additional information.

48HC

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Contents Installation Instructions Safety Considerations Unit Dimensional Drawing 17 Size Unit C10897 Unit Dimensional Drawing 20 and 24 Size Units C10893 Unit Dimensional Drawing 28 Size Unit C10901 Roof Mount Operating WeightsPlan for Unit Location Provide Unit Support Plan for Sequence of Unit InstallationInspect unit Roof Curb Details 17 Size Unit Roof Curb Details 20 and 24 Size Units Roof Curb Details 28 Size Unit Rig and Place Unit Field Fabricate DuctworkPositioning on Curb Install Outside Air Hood Factory OptionHorizontal Duct Connection Gas Supply Line Install Flue Hood and Combustion Air HoodInstall Gas Piping To assemble the outside air hoodNatural Gas Supply Line Pressure Ranges Typical 3/4-in NPT Field Supplied Piping PartsOrifice Hole Factory-Option Thru-Base ConnectionsMake Electrical Connections Install External Condensate Trap and LineField Power Supply All Units Units with Factory-Installed DisconnectPowered Convenience Outlet Wiring Unit without Thru-Base Connection Kit Field Control WiringUnits without Thru-Base Connections ThermostatTypical Low-Voltage Control Connections Transformer Connection for 208-v Power SupplyTo connect the Thermidistat device 33CS2PPRH-01 Humidi-MiZerRControl ConnectionsHumidi-MiZer Space RH Controller To connect the Carrier humidistat HL38MG029OAT RRS Srtn PremierLink Controller PremierLinkt Factory-OptionPremierLink Wiring Schematic PremierLink Wiring Schematic with Humidi-MiZerR PremierLink Sensor Usage Supply Air Temperature SAT SensorField Connections EconoMi$er2Thermostat Mode Space Sensor ModeSpace Sensors Configure the Unit for Thermostat ModeIndoor Air Quality CO2 Sensor Economizer ControlsTo wire the sensor Space Relative Humidity Sensor InstallationSmoke Detector/Fire Shutdown FSD Filter Status SwitchSupply Fan Status Switch Power Exhaust outputRecommended Cables Connecting CCN Bus Color Code RecommendationsCCN Communication Bus RTU Open Multi-Protocol Control Board RTU Open Control SystemRTU Open System Control Wiring Diagram RTU Open System Control Wiring Diagram with Humidi-MiZerR Type of I/O Connection PIN Name Numbers Dedicated Inputs RTU Open Controller Inputs and OutputsRTU Open T-55 Sensor Connections Space Temperature SPT SensorsRelative Humidity Sensors Space or Duct Mounted Space Relative Humidity Sensor Typical WiringConnecting Discrete Inputs Duct Relative Humidity Sensor Typical WiringGeneral Communication Wiring ProtocolsRTU Open Troubleshooting Local AccessDifferential Enthalpy Control Outdoor Air Enthalpy ControlLEDs Smoke Detectors WiringReturn Air Sensor Tube Installation Additional Application Data To install the return air sensor sampling tubeUnit Wire/Fuse or Hacr Breaker Sizing Data Smoke Detector Test MagnetUnit NOM IFM FAN Motor Exhaust Unbalanced 3-Phase Supply Voltage Pre-Start and Start-Up Adjust Factory-Installed OptionsInstall Accessories EconoMi$er IV Occupancy Switch48HC Catalog No 48HC---11SI

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.
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