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Carrier| Commercial Systems North America
48PM CENTURION?

48PM CENTURION?

Product catalog summary

Features and Benefits: The Carrier Centurion 48PM commercial rooftop units are designed for high efficiency, reliability, and ease of service. They utilize Puron refrigerant and Novation Heat Exchanger Technology, achieving cooling efficiencies up to 12.0 EER and 12.6 IPLV. These units are engineered for low sound levels and include a factory-installed Humidi-MiZert adaptive dehumidification system and an EnergyX energy recovery ventilator system.

Specifications: The units range from 15 to 25 nominal tons, surpassing ASHRAE 90.1 and ENERGY STAR standards, which ensures low operating costs and eligibility for utility rebates. They are designed for easy installation with convertible duct airflow configurations and a single roof curb size for all models.

Installation and Maintenance: Features such as hinged access doors, slide-out filter racks, and blower motor assemblies facilitate easy maintenance. The design incorporates microchannel technology condenser coils for enhanced performance and reliability. ComfortLink controls provide advanced diagnostics and remote capabilities.

Optional Systems: The Humidi-MiZert system offers dual dehumidification modes, while the EnergyX system provides energy recovery, reducing operating costs and enhancing comfort control. The EnergyX system complies with ASHRAE 62.1-2004 standards and includes features like a rotary heat exchanger wheel and CO2 sensor compatibility.

Construction and Reliability: Constructed with weather-resistant galvanized steel, the units feature fully insulated cabinets and reliable scroll compressors. They are factory-tested for quality assurance and come with comprehensive warranty coverage, including a 5-year compressor warranty and a 10-year heat exchanger warranty.

Economizers and Air Management: Integrated economizers modulate outdoor-air dampers for efficient cooling, with additional compressor stages activated as needed. The system is controlled by a thermistor sensing outdoor-air temperature.

Motor and Fan Specifications: Detailed specifications include motor shaft diameters, pulley pitch diameters, fan RPM ranges, and belt types. Motor horsepower, nominal RPM, and maximum continuous BHP and watts are specified for different motor frame sizes.

Procedures: The document outlines the operating sequence for heating and cooling systems, including the use of integrated gas unit controllers (IGC) and economizers. It describes the ignition process, burner operation, and fan motor activation.

Standards and Norms: Standard features and options for HVAC units include coil options, dehumidification systems, economizers, and energy recovery systems. Electrical and control options include ComfortLink™ DDC controllers and various sensors.

Recommendations: Recommendations include using economizers for cooling when outdoor conditions are favorable and ensuring proper setup of CO2 sensors for indoor air quality control.

Performance Data: Performance data for power exhaust fans and barometric relief flow capacity is provided, along with accessory pressure drop information. Evaporator fan motor specifications are detailed for various unit orientations and voltages.

Diagrams and Schematics: Wiring schematics for low voltage control and power systems, as well as component arrangement diagrams for units with different control systems, are included.

Critical Information: Key parameters include motor specifications, fan RPM ranges, and economizer control settings. Proper installation and configuration are emphasized to avoid operational faults, as indicated by LED error codes on the IGC.

Cooling Using Space Sensor Control: The unit operates in Space Sensor mode when the Unit Control Type is set to Space Sensor and a wire is added between R and W1 on TB2. The unit maintains the Space Temperature (SPT) at one of four set points depending on occupancy. The control switches automatically between cooling and heating with a 10-minute delay to prevent unnecessary mode changes.

Cooling Using Thermostat Control: Thermostat cooling begins when the Y1 input is energized. The economizer maintains the Supply Air Temperature (SAT) and stages compressors if necessary. Three compressor-staging algorithms are available: Adaptive, 1-stage Y1, and 2-stage Y1.

Optional Humidi-MiZert Dehumidification System: This system provides improved dehumidification with multiple modes, including Normal Cooling, Reheat1 (Subcooling Mode), and Reheat2 (Hot Gas Reheat Mode).

Application Data: Ductwork should be attached to the curb, and care should be taken not to drill in the condensate drain pan area. The unit supports automatic changeover from heating to cooling.

Outdoor Air Application Strategies: Various devices can be used for outdoor air, including manual dampers, economizers, and energy recovery devices. Economizers are recommended for energy savings and proper ventilation control.

Low Ambient Applications: Economizers can provide cooling by bringing in fresh air, and head pressure control devices allow compressor operation in low ambient temperatures.

Motor Data and Condenser Coil Protection: Carrier motors are designed for reliability, and copper-fin evaporator coils offer increased corrosion resistance. E-Coated coils provide protection in industrial environments.

Indoor Air Quality: An indoor air quality sensor is available to maintain air quality in conjunction with the economizer. Enthalpy sensors can be used to measure air suitability.

Overview: This document provides detailed specifications and guidelines for a packaged rooftop unit with gas heat, designed for constant volume with Puron R-410A refrigerant and Novation heat exchanger condenser coils. The unit is intended for outdoor rooftop installation and offers high cooling efficiency with environmentally friendly refrigerant.

System Description: The unit is electrically controlled, featuring fully hermetic scroll compressors for cooling and induced draft gas combustion for heating. It supports both downward and horizontal air discharge and is designed to exceed ASHRAE 90.1-2001 Energy Efficiency Standards.

Quality Assurance: The unit is ENERGY STAR qualified, rated according to AHRI Standards 360, and designed to conform to ASHRAE 15. It is UL and UL Canada tested and certified, with components meeting various industry standards for safety and performance.

Delivery, Storage, and Handling: The unit must be stored and handled according to the manufacturer's recommendations to ensure optimal performance and longevity.

Equipment Specifications: The unit cabinet is constructed from galvanized steel with a baked enamel finish, featuring insulated interior surfaces and hinged access panels for easy maintenance. Fans include centrifugal supply air blower and direct-driven condenser fans, designed for durability and efficiency. The compressor features fully hermetic, scroll-type compressors with vibration isolation and sound reduction measures. Coils utilize aluminum lanced plate fins and copper tubes for evaporator coils, with Micro-Channel coil technology for condenser coils. The heating section is induced-draft combustion type with direct-spark ignition and redundant gas valve for safety. Refrigerant components include thermostatic expansion valve, filter driers, and pressure gauge ports. The filter section is equipped with disposable fiberglass filters, with options for MERV-8 pleated filters. Controls and safeties feature ComfortLink controls with various safety mechanisms and diagnostic capabilities. Operating characteristics include capability of operating in extreme temperatures, with fan time delay to prevent cold air delivery in heating mode. Electrical requirements are designed for single-location power wiring entry. Motors include compressor and fan motors with thermal overload protection and efficiency standards compliance.

Special Features: Options include full perimeter roof curbs, integrated economizer, motorized outdoor air dampers, and barometric relief damper package, among others, to enhance functionality and adaptability to different installation requirements.

Specifications: The package includes two centrifugal exhaust fans with a 1 Hp motor, factory-wired for 460v, featuring three-speed direct-drive motors and dampers for units with economizers. Power exhaust is compatible with both vertical and horizontal configurations and can be installed in the field or factory. Electro-mechanical power exhaust modules are controlled by economizer controller logic.

Sensors and Controls: Single and differential enthalpy sensors provide economizer control based on outdoor air enthalpy and heat content comparison, respectively. CO2 sensors monitor levels to modulate the economizer for demand control ventilation. Return air/supply air smoke detectors are available for factory or field installation to shut down the unit if smoke is detected.

Convenience Outlets: Optional powered and non-powered convenience outlets are available, with the powered version including a step-down transformer and GFI protection.

Safety and Maintenance Features: Non-fused disconnect switches and circuit breakers provide unit power shutoff with lockout capability. Filter status and fan status switches indicate dirty filters and indoor fan operation, respectively.

Performance Enhancements: Various fan performance motor/drive options enhance evaporator fan performance across different ranges. MERV-8 pleated return air filters and 4-inch filter capability options are available.

Additional Features: Hail guard protects the condenser coil without affecting cooling capacity. Horizontal kits convert vertical airflow units to horizontal configurations. Phase loss protection ensures unit shutdown upon electrical phase loss detection. Roof curb burglar bars and electronic programmable thermostats are available for enhanced security and control.

Dehumidification System: The Humidi-MiZert system provides enhanced dehumidification through subcooling and hot gas reheat modes, controlled by a wall-mounted humidity sensor or humidistat. The system includes a thermostatic expansion valve for positive superheat conditions and operates independently across multiple circuits.

Cooling Capacity Tables: Detailed tables provide cooling capacity data for units with and without the Humidi-MiZert system across various conditions, including sub-cooling and reheat modes.

Overview: This document provides detailed technical specifications and performance data for cooling units equipped with the Humidi-MiZert System. It includes information on cooling capacities, power input, and performance under various conditions.

Key Sections:

Specifications: The document outlines the cooling capacities (Total Capacity - TC and Sensible Heat Capacity - SHC) in 1000 Btu/h, and compressor motor power input (kW) for different air entering conditions and evaporator air quantities.
Performance Data: Tables provide data for various configurations, including air entering condenser dry-bulb (Edb) and evaporator wet-bulb (Ewb) temperatures, and different cubic feet per minute (CFM) of air flow.
Formulas and Calculations: Includes formulas for calculating leaving dry-bulb and wet-bulb temperatures, and adjustments to SHC based on entering air dry-bulb temperatures.
Bypass Factor and Correction Factors: Details on how to apply correction factors based on bypass factor (BF) and entering air dry-bulb temperatures.
General Notes: Instructions on fan performance data, including static pressure losses, motor and drive testing, and recalculating power supply requirements if using field-supplied motors.

Critical Information:

Direct interpolation is permissible, but extrapolation is not recommended.
Fan performance data is based on wet coils, clean filters, and casing losses.
Use of field-supplied motors may require recalculation of power supply parameters.

Overview: This document provides detailed fan performance data for various models of vertical and horizontal supply/return units. It includes specifications on airflow (CFM), external static pressure, fan speed (RPM), brake horsepower (BHP), and drive options.

Specifications:

CFM (Cubic Feet per Minute): Indicates the airflow capacity of the fan units.
External Static Pressure (in. wg): The resistance to airflow in the system, measured in inches of water gauge.
RPM (Revolutions Per Minute): The speed at which the fan operates.
BHP (Brake Horsepower): The power input to the fan motor.
Drive Options: Motor and pulley drive options based on voltage and maximum BHP.

Performance Data:

Data tables provide RPM, BHP, and drive options for different CFM and static pressure levels.
Grey cells in tables indicate a field-supplied pulley change is required.
Do not exceed the listed motor maximum BHP value.

Motor Drive Ranges:

Low Range (A): RPM 685 to 939, Max BHP 4.26 for 208/230 and 460V; RPM 751 to 954, Max BHP 5.75 for 575V.
Mid-Low Range (B): RPM 949 to 1206, Max BHP 5.75 for all voltages.
Mid-High Range (C): RPM 941 to 1176, Max BHP 8.63 for all voltages.
High Range (D): RPM 1014 to 1297, Max BHP 11.50 for all voltages.

Recommendations:

Ensure motor BHP does not exceed maximum values to prevent damage.
Consider field-supplied pulley changes where indicated for optimal performance.

Catalog excerpts

Ultra High Efficiency Single Package Gas Heating/Electric Cooling Commercial Rooftop Units with Puron® (R-410A) Refrigerant Product Data DEALER DESIGN Editors Choice the environmentally sound refrigerant Copyright 2010 Carrier Corp. • 7310 W. Morris St • Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 9/10 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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Easy Installation PAGE FEATURES/BENEFITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 MODEL NUMBER NOMENCLATURE . . . . . . . . . . . . . . . . . 6 AHRI CAPACITY RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . 7 OPERATION AIR QUANTITY LIMITS . . . . . . . . . . . . . . . . 10 PHYSICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 OPTIONS AND ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . 14 BASE UNIT DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 16 ACCESSORY DIMENSIONS . . . . . . . . . . . . . . . . . . ....

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Carrier’s 48PM rooftop units include microchannel technology condenser coils. Microchannel technology provides many performance and reliability benefits, that results in a more compact coil design with high coil and overall unit efficiencies. In addition, the surface of the coil is much more robust than a conventional round tube plate fin copper tube aluminum fin coil. S 0.3 fins/inch S 18 louvers per fin S 32 ports per tube (high ratio of internal wetted perimeter to flow area) S Double wall thickness on exposed tube edges S All aluminum coil S Furnace-brazed coil S Epoxy-lined shrink wrap protection...

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Indoor Air Quality Begins With Carrier Rooftops Two-in. disposable filters are factory furnished as standard in every unit with the capability of accommodating 4-in. filters with Factory Option as well as factory-installed MERV- pleated -8 filters. Internally sloped condensate pans are self-draining to ensure minimizing biological growth in rooftop units in accordance with ASHRAE Standard 62. All 48PM16-28 units use an epoxy powder-coated steel condensate pan. Unit uses foil-faced cleanable insulation that is securely fastened. Selected panels are mechanically fastened for added support. All...

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ComfortLinkt Control Option The ComfortLink control is your link to a world of simple and easy to use rooftop units that offer outstanding performance and value. When used with a space temperature sensor, the ComfortLink controls’ intelligence maintains control over the economizer and condenser fans and optimizes the performance of the refrigeration circuits as conditions change resulting in the following features: S Better control of temperature and humidity S Superior reliability S Automatic redundancy S Low ambient cooling operation to 0_F S More accurate diagnostics, at unit or remote The...

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MODEL NUMBER NOMENCLATURE 48PM Product Series Type 48PM --- Single Packaged CV Rooftop Unit with PuronR Refrigerant and Gas Heat Gas Heat Options D --- Low Heat Standard Heat Exchanger E --- Medium Heat Standard Heat Exchanger F --- High Heat Standard Heat Exchanger L* --- Low Heat Stainless Steel Heat Exchanger M* --- Medium Heat Stainless Steel Heat Exchanger N* --- High Heat Stainless Steel Heat Exchanger Factory--- Installed Options Base Unit Control Type C --- ComfortLinkt DDC Controls M --- Electro--- Mechanical Controls EnergyXt Options*** --- --- Standard, No EnergyX E --- Low CFM EnergyX...

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AHRI* CAPACITY RATINGS LEGEND ASHRAE dB EER IPLV ENGLISH Units Btu/h kW Btu/h/W Btu/h/W ft^3/min --- American Society of Heating, Refrigeration and Air Conditioning Engineers --- Decibel --- Energy Efficiency Ratio --- Integrated Part---Load Values *Air Conditioning, Heating and Refrigeration Institute. **IPLV values are calculated based on control configuration T.CTL = 2 (2 Stage Y1). {Size 28 unit is not listed with AHRI, but is tested to AHRI Standards. NOTES: 1. Tested in accordance with AHRI Standards 360 ---95 (18 ---28 sizes). 2. Ratings are net values, reflecting the effects of circulating...

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Heating Capacities and Efficiencies — 48PM 16-28 Vertical and Horizontal Supply Units (Natural Gas) - Three Phase Standard Stainless Steel HEATING INPUT Stage 2 (Btuh) HEATING INPUT Stage 1 (Btuh) OUTPUT CAPACITY Stage 2 (Btuh) THERMAL EFFICIENCY (%) LEGEND AFUE ASHRAE Annual Fuel Utilization Efficiency American Society of heating, Refrigeration and Air Conditioning Engineers Liquid Propane * Minimum Heating cfm must be maintained to ensure proper heating operation. NOTES: 1. Minimum allowable temperature of mixed air entering the heat exchanger during first stage heating is 45_F. Both stages...

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Altitude Compensation* — 48PM16- (Natural Gas) -28 ELEVATION (FT) * As the height above sea level increases, there is less oxygen per cubic foot of air. Therefore, heat input rate should be reduced at higher altitudes. Includes a 4% input reduction per each 1000 ft. { Orifices available through your local Carrier dealer. MEDIUM HEAT * As the height above sea level increases, there is less oxygen per cubic foot of air. Therefore, heat input rate should be reduced at higher altitudes. Includes a 4% input reduction per each 1000 ft. { Orifices available through your local Carrier dealer. * Derating...

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OPERATION AIR QUANTITY LIMITS 48PM Heating Operational CFM Limits COOLING High Heat (8 Cell) Medium Heat (8 Cell) Low Heat (5 Cell) High Heat (8 Cell) Medium Heat (8 Cell) Low Heat (5 Cell) High Heat (8 Cell) Medium Heat (8 Cell) Low Heat (5 Cell) High Heat (8 Cell) Medium Heat (8 Cell) Low Heat (5 Cell) *7000 cfm minimum recommended above 1.0 in. wg external static pressure. Outdoor Sound Power (Total Unit) OCTAVEBANDS LEGEND AHRI --- Air Conditioning, Heating and Refrigeration Institute NOTES: *Indoor sound power is available in Carrier’s Electronic Catalog Program for specific operating parameters....

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PHYSICAL DATA Physical Data - 48PM16-28 High Heat Medium Heat * Aluminum evaporator coil/aluminum condenser coil with low heat Round Tube Plate Fin 4 4 15 15 23.1 23.1 Balanced-Port TXV w/ bypass Round Tube Plate Fin amps in. in. wg. psig total deg F deg F ** For applications less than 2000 ft elevation *** Vertical application numbers shown. UNIT 48PM DIMENSIONS Length Width Height OPERATING WEIGHT Base unit (50 series) Base unit (48 series, low heat) COMPRESSOR Type Quantity Number of circuits Capacity Stages (%) Circuit 1 - Circuit 2 Oil type Oil quantity Circuit A Circuit B REFRIGERANT Type...

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48PM CENTURION?

48PM CENTURION?

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