Carrier 48HC installation instructions Installation Instructions

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48HC

Single Package Rooftop

Gas Heating/Electric Cooling Unit with Puronr (R---410A) Refrigerant Sizes: 17, 20, 24, 28

Installation Instructions

NOTE: Read the entire instruction manual before starting the installation

TABLE OF CONTENTS

SAFETY CONSIDERATIONS

2

INSTALLATION

9

Jobsite Survey

9

Step 1 - Plan for Unit Location

9

Roof Mount

9

Step 2 - Plan for Sequence of Unit Installation

10

Curb-Mount Installation

10

Pad-Mount Installation

10

Frame-Mount Installation

10

Step 3 - Inspect Unit

10

Step 4 - Provide Unit Support

10

Roof Curb Mount

10

Slab Mount (Horizontal Units Only)

10

Alternate Unit Support

 

(In Lieu of Curb or Slab Mount)

10

Step 5 - Field Fabricate Ductwork

14

Step 6 - Rig and Place Unit

14

Positioning on Curb

15

Step 7 - Horizontal Duct Connection

15

Step 8 - Install Outside Air Hood — Factory Option . .

15

Step 9 - Install Flue Hood and Combustion Air Hood . .

16

Step 10 - Install Gas Piping

16

Gas Supply Line

16

Factory-Option Thru-Base Connections

18

Step 11 - Install External Condensate Trap and Line . .

19

Step 12 - Make Electrical Connections

19

Field Power Supply

19

Units without Factory-Installed Disconnect . . . .

20

Units with Factory-Installed Disconnect

20

All Units

20

Convenience Outlets

20

Factory-Option Thru-Base Connections

22

Units without Thru-Base Connections . . . . . . . . . 22 Field Control Wiring . . . . . . . . . . . . . . . . . . . . . . . 22 Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Unit without Thru-Base Conversion Kit . . . . . . . 22 Heat Anticipator Settings . . . . . . . . . . . . . . . . . . . 23

Transformer Connection

for 208-v Power Supply . . . . . . . . . . . . . . . . . . . . . 23 Humidi-MiZerRControl Connections . . . . . . . . . . 24 Humidi-MiZer - Space RH Controller . . . . . . . . 24 PremierLinkt (Factory Option) . . . . . . . . . . . . . . . 26 Supply Air Temperature (SAT) Sensor . . . . . . . . . 29 Outdoor Air Temperature (OAT) Sensor . . . . . . . 29 EconoMi$er2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Field Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Space Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Connect Thermostat . . . . . . . . . . . . . . . . . . . . . . . 31 Configure the Unit for Thermostat Mode . . . . . . 31 Economizer Controls . . . . . . . . . . . . . . . . . . . . . . . . 32 Indoor Air Quality (CO2) Sensor . . . . . . . . . . . . . 32 Outdoor Air Quality Sensor . . . . . . . . . . . . . . . . . 32

Space Relative Humidity Sensor or

Humidistat Connections . . . . . . . . . . . . . . . . . . . . 33 Smoke Detector/Fire Shutdown (FSD) . . . . . . . . . 34 Filter Status Switch . . . . . . . . . . . . . . . . . . . . . . . . 34 Supply Fan Status Switch . . . . . . . . . . . . . . . . . . . 34 Remote Occupied Switch . . . . . . . . . . . . . . . . . . . 34 Power Exhaust (output) . . . . . . . . . . . . . . . . . . . . . 34 CCN Communication Bus . . . . . . . . . . . . . . . . . . 35

RTU Open Control System . . . . . . . . . . . . . . . . . . . 36 Supply Air Temperature (SAT) Sensor . . . . . . . . . 39 Outdoor Air Temperature (OAT) Sensor . . . . . . . 39 EconoMi$er2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

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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 Plan for Unit Location Operating WeightsRoof Mount Inspect unit Plan for Sequence of Unit InstallationProvide Unit Support 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 DuctworkHorizontal Duct Connection Install Outside Air Hood Factory OptionPositioning on Curb Install Gas Piping Install Flue Hood and Combustion Air HoodTo assemble the outside air hood Gas Supply LineNatural Gas Supply Line Pressure Ranges Typical 3/4-in NPT Field Supplied Piping PartsOrifice Hole Factory-Option Thru-Base ConnectionsField Power Supply Install External Condensate Trap and LineMake Electrical Connections All Units Units with Factory-Installed DisconnectPowered Convenience Outlet Wiring Units without Thru-Base Connections Field Control WiringThermostat Unit without Thru-Base Connection KitTypical Low-Voltage Control Connections Transformer Connection for 208-v Power SupplyHumidi-MiZer Space RH Controller Humidi-MiZerRControl ConnectionsTo connect the Carrier humidistat HL38MG029 To connect the Thermidistat device 33CS2PPRH-01OAT RRS Srtn PremierLink Controller PremierLinkt Factory-OptionPremierLink Wiring Schematic PremierLink Wiring Schematic with Humidi-MiZerR Field Connections Supply Air Temperature SAT SensorEconoMi$er2 PremierLink Sensor UsageThermostat Mode Space Sensor ModeSpace Sensors Configure the Unit for Thermostat ModeIndoor Air Quality CO2 Sensor Economizer ControlsTo wire the sensor Space Relative Humidity Sensor InstallationSupply Fan Status Switch Filter Status SwitchPower Exhaust output Smoke Detector/Fire Shutdown FSDCCN Communication Bus Connecting CCN Bus Color Code RecommendationsRecommended Cables RTU Open Multi-Protocol Control Board RTU Open Control SystemRTU Open System Control Wiring Diagram RTU Open System Control Wiring Diagram with Humidi-MiZerR Type of I/O Connection PIN Name Numbers Dedicated Inputs RTU Open Controller Inputs and OutputsRTU Open T-55 Sensor Connections Space Temperature SPT SensorsRelative Humidity Sensors Space or Duct Mounted Space Relative Humidity Sensor Typical WiringConnecting Discrete Inputs Duct Relative Humidity Sensor Typical WiringGeneral Communication Wiring ProtocolsRTU Open Troubleshooting Local AccessLEDs Outdoor Air Enthalpy ControlDifferential Enthalpy Control Return Air Sensor Tube Installation WiringSmoke Detectors Unit Wire/Fuse or Hacr Breaker Sizing Data To install the return air sensor sampling tubeSmoke Detector Test Magnet Additional Application DataUnit NOM IFM FAN Motor Exhaust Unbalanced 3-Phase Supply Voltage Install Accessories Adjust Factory-Installed OptionsEconoMi$er IV Occupancy Switch Pre-Start and Start-Up48HC 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.