Carrier 48HC installation instructions Safety Considerations

Page 2

48HC

Field Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Space Temperature (SPT) Sensors . . . . . . . . . . . . 40 Indoor Air Quality (CO2) Sensor . . . . . . . . . . . . . 40 Outdoor Air Quality Sensor . . . . . . . . . . . . . . . . . 41 Space Relative Humidity Sensor or Humidistat . . 41 Smoke Detector/Fire Shutdown (FSD) . . . . . . . . . 42 Connecting Discrete Inputs . . . . . . . . . . . . . . . . . . 42

Communication Wiring - Protocols . . . . . . . . . . . . 43 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Local Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 RTU Open Troubleshooting . . . . . . . . . . . . . . . . . 44 Outdoor Air Enthalpy Control . . . . . . . . . . . . . . . . . 45 Differential Enthalpy Control . . . . . . . . . . . . . . . . 45 Smoke Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Return Air Sensor Tube Installation . . . . . . . . . . . 46 Smoke Detector Test Magnet . . . . . . . . . . . . . . . . 47 Additional Application Data . . . . . . . . . . . . . . . . . 47 Step 13 - Adjust Factory-Installed Options . . . . . . . . 50 Step 14 - Install Accessories . . . . . . . . . . . . . . . . . . . 50

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock or other conditions which may cause personal injury or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloths for brazing operations and have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult local building codes and appropriate national electrical codes (in USA, ANSI/NFPA70, National Electrical Code (NEC); in Canada, CSA C22.1) for special requirements.

It is important to recognize safety information. This is the

safety-alert symbol . When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury.

Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices, which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.

!WARNING

FIRE, EXPLOSION HAZARD

Failure to follow this warning could result in personal injury or death.

Disconnect gas piping from unit when leak testing at pressure greater than 0.5 psig (3450 Pa). Pressures greater than 0.5 psig (3450 Pa) will cause gas valve damage resulting in hazardous condition. If gas valve is subjected to pressure greater than 0.5 psig (3450 Pa), it must be replaced before use. When pressure testing field-supplied gas piping at pressures of 0.5 psig (3450 Pa) or less, a unit connected to such piping must be isolated by closing the manual gas valve.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personal injury or death.

Before performing service or maintenance operations on unit, always turn off main power switch to unit and install lock(s) and lockout tag(s). Unit may have more than one power switch.

!WARNING

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this warning could cause personal injury, death and/or equipment damage.

Puronr (R-410A) refrigerant systems operate at higher pressures than standard R-22 systems. Do not use R-22 service equipment or components on Puron refrigerant equipment.

!WARNING

PERSONAL INJURY AND ENVIRONMENTAL HAZARD

Failure to follow this warning could cause personal injury or death.

Relieve pressure and recover all refrigerant before system repair or final unit disposal.

Ware safety glasses and gloves when handling refrigerants. Keep torches and other ignition sources away from refrigerants and oils.

!CAUTION

CUT HAZARD

Failure to follow this caution may result in personal injury.

Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing, safety glasses and gloves when handling parts and servicing air conditioning equipment.

2

Page 1 Page 3
Image 2
Page 1 Page 3
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 Field Fabricate Ductwork Rig and Place UnitPositioning on Curb Install Outside Air Hood Factory OptionHorizontal Duct Connection 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 HoleMake Electrical Connections Install External Condensate Trap and LineField Power Supply 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$er2 Supply Air Temperature SAT SensorField Connections PremierLink Sensor UsageSpace Sensor Mode Thermostat ModeConfigure the Unit for Thermostat Mode Space SensorsEconomizer Controls Indoor Air Quality CO2 SensorSpace Relative Humidity Sensor Installation To wire the sensorPower Exhaust output Filter Status SwitchSupply Fan Status Switch Smoke Detector/Fire Shutdown FSDRecommended Cables Connecting CCN Bus Color Code RecommendationsCCN Communication Bus RTU Open Control System RTU Open Multi-Protocol Control BoardRTU Open System Control Wiring Diagram RTU Open System Control Wiring Diagram with Humidi-MiZerR RTU Open Controller Inputs and Outputs Type of I/O Connection PIN Name Numbers Dedicated InputsSpace Temperature SPT Sensors RTU Open T-55 Sensor ConnectionsSpace Relative Humidity Sensor Typical Wiring Relative Humidity Sensors Space or Duct MountedDuct Relative Humidity Sensor Typical Wiring Connecting Discrete InputsCommunication Wiring Protocols GeneralLocal Access RTU Open TroubleshootingDifferential Enthalpy Control Outdoor Air Enthalpy ControlLEDs Smoke Detectors WiringReturn Air Sensor Tube Installation Smoke Detector Test Magnet To install the return air sensor sampling tubeUnit Wire/Fuse or Hacr Breaker Sizing Data Additional Application DataUnit NOM IFM FAN Motor Exhaust Unbalanced 3-Phase Supply Voltage EconoMi$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.
Top Page Image Contents