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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Carrier 48HC installation instructions Installation Instructions

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.