Carrier 48HC Smoke Detectors, Wiring, Return Air Sensor Tube Installation

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48HC

 

 

 

 

– 4-20

24V

 

 

 

RED

 

 

PL6-1 (24-V)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Main

GND

 

 

 

BLK

 

 

PL6-4 (COM)

 

 

 

 

+ VDC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CTB ECON

 

 

 

 

Out

LOW

 

 

 

GRA

 

 

7

 

 

 

 

 

 

 

 

(P’LINK: to J4-2) or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(RTU Open: to J2-6)

 

 

 

 

Outside Air

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Enthalpy Switch

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+ 24-36

 

 

 

 

Return Air

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VDC In

 

 

 

 

Enthalpy

 

 

 

 

 

 

– 4-20 Main

 

 

 

 

Sensor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Out

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C11161

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig. 72 - Outside and Return Air Enthalpy Sensor

 

 

 

 

 

 

Wiring

 

 

To wire the return air enthalpy sensor, perform the following:

1.Use a 2-conductor, 18 or 20 AWG, twisted pair cable to connect the return air enthalpy sensor to the enthal- py controller.

2.Connect the field-supplied RED wire to (+) spade connector on the return air enthalpy sensor and the

(+)terminal on the enthalpy controller. Connect the BLK wire to (-) spade connector on the return air en- thalpy sensor and the (-) terminal on the enthalpy controller.

Smoke Detectors

Smoke detectors are available as factory-installed options on 48HC models. Smoke detectors may be specified for Supply Air only or for Return Air without or with economizer or in combination of Supply Air and Return Air. Return Air smoke detectors are arranged for vertical return configurations only. The unit is factory-configured for immediate smoke detector shutdown operation; additional wiring or modifications to unit terminal board may be necessary to complete the unit and smoke detector configuration to meet project requirements.

Return Air Sensor Tube Installation –

The return air sampling tube is shipped in the unit￿s supply fan section, attached to the blower housing (see Fig. 73. Its operating location is in the return air section of the unit (see Fig. 74, unit without economizer, or Fig. 75, unit with economizer), inserted into the return air sensor module housing which protrudes through the back of the control box.

Return Air Sampling Tube

(Shipping Location)

C09102

Fig. 73 - Typical Supply Air Smoke Detector Sensor

Location

Return Air Detector

Sampling Tube

C09135

Fig. 74 - Return Air Sampling Tube Location

in Unit without Economizer

Return Air Detector

Sampling Tube

C09136

Fig. 75 - Return Air Sampling Tube Location

in Unit with Economizer

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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 Field Fabricate Ductwork Rig and Place UnitHorizontal Duct Connection Install Outside Air Hood Factory OptionPositioning on Curb To assemble the outside air hood Install Flue Hood and Combustion Air HoodInstall Gas Piping Gas Supply LineTypical 3/4-in NPT Field Supplied Piping Parts Natural Gas Supply Line Pressure RangesFactory-Option Thru-Base Connections Orifice HoleField Power Supply Install External Condensate Trap and LineMake Electrical Connections Units with Factory-Installed Disconnect All UnitsPowered Convenience Outlet Wiring Thermostat Field Control WiringUnits without Thru-Base Connections Unit without Thru-Base Connection KitTransformer Connection for 208-v Power Supply Typical Low-Voltage Control ConnectionsTo connect the Carrier humidistat HL38MG029 Humidi-MiZerRControl ConnectionsHumidi-MiZer Space RH Controller To connect the Thermidistat device 33CS2PPRH-01OAT RRS Srtn PremierLinkt Factory-Option PremierLink ControllerPremierLink Wiring Schematic PremierLink Wiring Schematic with Humidi-MiZerR EconoMi$er2 Supply Air Temperature SAT SensorField Connections PremierLink Sensor UsageSpace Sensor Mode Thermostat ModeConfigure the Unit for Thermostat Mode Space SensorsEconomizer Controls Indoor Air Quality CO2 SensorSpace Relative Humidity Sensor Installation To wire the sensorPower Exhaust output Filter Status SwitchSupply Fan Status Switch Smoke Detector/Fire Shutdown FSDCCN Communication Bus Connecting CCN Bus Color Code RecommendationsRecommended Cables RTU Open Control System RTU Open Multi-Protocol Control BoardRTU Open System Control Wiring Diagram RTU Open System Control Wiring Diagram with Humidi-MiZerR RTU Open Controller Inputs and Outputs Type of I/O Connection PIN Name Numbers Dedicated InputsSpace Temperature SPT Sensors RTU Open T-55 Sensor ConnectionsSpace Relative Humidity Sensor Typical Wiring Relative Humidity Sensors Space or Duct MountedDuct Relative Humidity Sensor Typical Wiring Connecting Discrete InputsCommunication Wiring Protocols GeneralLocal Access RTU Open TroubleshootingLEDs Outdoor Air Enthalpy ControlDifferential Enthalpy Control Return Air Sensor Tube Installation WiringSmoke Detectors Smoke Detector Test Magnet To install the return air sensor sampling tubeUnit Wire/Fuse or Hacr Breaker Sizing Data Additional Application DataUnit NOM IFM FAN Motor Exhaust Unbalanced 3-Phase Supply Voltage EconoMi$er IV Occupancy Switch Adjust Factory-Installed OptionsInstall Accessories 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.
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