Carrier 48HC installation instructions Powered Convenience Outlet Wiring

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Two types of convenience outlets are offered on 48HC models: Non-unit powered and unit-powered. Both types provide a 125-volt GFCI (ground-fault circuit-interrupter) duplex receptacle rated at 15-A behind a hinged access cover, located on the corner panel of the unit. See Fig. 26.

Control Box

Access Panel

Electric

Disconnect

Switch

Convenience

Outlet

C10641

Fig. 26 - Convenience Outlet Location

Installing Weatherproof Cover: A weatherproof while-in-use cover for the factory-installed convenience outlets is now required by UL standards. This cover cannot be factory-mounted due to its depth; it must be installed at unit installation. For shipment, the convenience outlet is covered with a blank cover plate.

The weatherproof cover kit is shipped in the unit’s control box. The kit includes the hinged cover, a backing plate and gasket.

DISCONNECT ALL POWER TO UNIT AND CONVENIENCE OUTLET. LOCK-OUT AND TAG-OUT ALL POWER.

Remove the blank cover plate at the convenience outlet; discard the blank cover.

Loosen the two screws at the GFCI duplex outlet, until approximately 1/2-in (13 mm) under screw heads are exposed. Press the gasket over the screw heads. Slip the backing plate over the screw heads at the keyhole slots and align with the gasket; tighten the two screws until snug (do not over-tighten).

Mount the weatherproof cover to the backing plate as shown in Fig. 27. Remove two slot fillers in the bottom of the cover to permit service tool cords to exit the cover. Check for full closing and latching.

COVER – WHILE-IN-USE

RECEPTACLE

WEATHERPROOF

NOT SHOWN

 

 

 

BASE PLATE FOR

GFCI RECEPTACLE

Non-unit powered type: This type requires the field installation of a general-purpose 125-volt 15-A circuit powered from a source elsewhere in the building. Observe national and local codes when selecting wire size, fuse or breaker requirements and disconnect switch size and location. Route 125-v power supply conductors into the bottom of the utility box containing the duplex receptacle.

Unit-powered type: A unit-mounted transformer is factory-installed to stepdown the main power supply voltage to the unit to 115-v at the duplex receptacle. This option also includes a manual switch with fuse, located in a control box and mounted on a bracket behind the convenience outlet; access is through the unit’s control box access panel. See Fig. 26.

The primary leads to the convenience outlet transformer are not factory-connected. If local codes permit, the transformer primary leads can be connected at the line-side terminals on the unit-mounted non-fused disconnect switch; this will provide service power to the unit when the unit disconnect switch is open. See Fig. 28.

 

 

 

C10730

UNIT

CONNECT

PRIMARY

TRANSFORMER

VOLTAGE

AS

CONNECTIONS

TERMINALS

208,

240

L1: RED +YEL

H1 + H3

230

L2: BLU + GRA

H2 + H4

 

 

 

L1: RED

H1

460

480

Splice BLU + YEL

H2 + H3

 

 

L2: GRA

H4

575

600

L1: RED

H1

L2: GRA

H2

 

 

Fig. 28 - Powered Convenience Outlet Wiring

48HC

Fig. 27 - Weatherproof Cover Installation

C09022

21

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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 Operating Weights Plan for Unit LocationRoof Mount Plan for Sequence of Unit Installation Inspect unitProvide 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 DuctworkInstall Outside Air Hood Factory Option Horizontal Duct ConnectionPositioning 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 ConnectionsInstall External Condensate Trap and Line Field Power SupplyMake 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$er2 PremierLink Sensor UsageThermostat Mode Space Sensor ModeSpace Sensors Configure the Unit for Thermostat ModeIndoor Air Quality CO2 Sensor Economizer ControlsTo wire the sensor Space Relative Humidity Sensor InstallationSupply Fan Status Switch Filter Status SwitchPower Exhaust output Smoke Detector/Fire Shutdown FSDConnecting CCN Bus Color Code Recommendations CCN Communication BusRecommended Cables RTU Open Multi-Protocol Control Board RTU Open Control SystemRTU Open System Control Wiring Diagram RTU Open System Control Wiring Diagram with Humidi-MiZerR Type of I/O Connection PIN Name Numbers Dedicated Inputs RTU Open Controller Inputs and OutputsRTU Open T-55 Sensor Connections Space Temperature SPT SensorsRelative Humidity Sensors Space or Duct Mounted Space Relative Humidity Sensor Typical WiringConnecting Discrete Inputs Duct Relative Humidity Sensor Typical WiringGeneral Communication Wiring ProtocolsRTU Open Troubleshooting Local AccessOutdoor Air Enthalpy Control LEDsDifferential Enthalpy Control Wiring Return Air Sensor Tube InstallationSmoke Detectors Unit Wire/Fuse or Hacr Breaker Sizing Data To install the return air sensor sampling tubeSmoke Detector Test Magnet Additional Application DataUnit NOM IFM FAN Motor Exhaust Unbalanced 3-Phase Supply Voltage Install Accessories Adjust Factory-Installed OptionsEconoMi$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.

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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.

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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.

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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.