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Carrier| Commercial Systems North America
48A WEATHERMAKER®

48A WEATHERMAKER®

Product catalog summary

Overview: Carrier's 48/50A Series commercial packaged rooftop units are designed for flexibility, efficiency, and environmental responsibility. They feature Puron (R-410A) refrigerant, Novation heat exchanger technology, and ComfortLink controls, ensuring compliance with ASHRAE standards and offering various air volume options.

Key Features:

Environmentally Sound Refrigerant: Utilizes Puron (R-410A), an HFC refrigerant that is non-ozone depleting.
ComfortLink Controls: Provides easy-to-use, plain language display and integration with building systems via BACnet, MODBUS, or LonWorks protocols.
Design Flexibility: Available in vertical and horizontal configurations, suitable for new constructions or retrofits.
Energy Efficiency: Meets ASHRAE Standard 90.1-2010 with high EERs and supports variable frequency drive (VFD) for energy savings.
Reliability: Features multiple scroll compressors, independent refrigerant circuits, and robust microchannel coils.

ComfortLink Controls: These controls enhance performance by optimizing temperature and humidity control, providing diagnostic information, and supporting system integration. They also prevent reverse compressor rotation and allow for easy service diagnostics.

Novation Heat Exchanger Technology: Utilizes microchannel condenser coils for reduced weight and refrigerant charge, offering a robust and cost-effective solution.

Gas Heating Units: Equipped with an Integrated Gas Unit Controller (IGC) for diagnostics and safety, featuring tubular, dimpled heat exchangers for efficient heat transfer.

Installation and Serviceability: Units are designed for easy installation with single-point electrical connections and require no field alterations for vertical or horizontal configurations.

Technical Specifications and Features: The document outlines the features and specifications of a unit equipped with the ComfortLink control system. This system includes an alpha-numeric display and keypad, expandable text messages, and supports an enhanced multiple line display. The unit can be operated with either a room sensor or a conventional thermostat without additional accessories. It allows for pre-installation run-testing and features hinged access panels for easy maintenance.

Control Options and Configurations: The unit offers various control options, including CO2 sensors, smoke detectors, and plugged filter indicators, with or without a controls expansion module. It supports different configurations such as Constant Volume (CV), Staged Air Volume (SAV), and Variable Air Volume (VAV), with options for vertical or horizontal setups.

Model Number Nomenclature: The document provides a detailed breakdown of model numbers, explaining the significance of each component, such as unit size, configuration, voltage, heat options, and motor options. It also includes coil options and factory-installed options.

Heating and Cooling Capacities: The document details the electric resistance heater data, cooling CFM operating range, and gas heating capacities and efficiencies. It specifies the minimum and maximum CFM for various unit sizes and heating options, along with the temperature rise and efficiency percentages.

Capacity Control Staging Options: Various tables outline the capacity control staging options for different unit sizes and configurations, both with and without hot gas bypass. These tables provide detailed information on compressor status and capacity percentages for different stages.

Quality Assurance: The units are certified to ISO 9001 standards, ensuring quality and reliability.

Specifications: The document provides detailed specifications for HVAC units, including nominal capacities ranging from 20 to 60 tons. Each unit features two refrigerant circuits, precharged with R-410A refrigerant. The compressors vary by model, with types such as ZP67, ZP91, ZP103, ZP120, and ZP154.

Procedures: Operating charge details are specified for each circuit, with values provided in pounds and ounces. The document outlines the use of MCHX condensers and propeller-type condenser fans, with nominal CFM values ranging from 19,500 to 40,000 depending on the unit size.

Standards and Norms: High-pressure switch settings are standardized across units, with a cutout at 650 psig and automatic reset at 500 psig. The document specifies the use of cross-hatched copper tubes and aluminum plate fins for evaporator coils.

Recommendations: For optimal performance, the document recommends maintaining supply line pressure within a range of 5.0 to 13.5 inches wg. It also provides guidelines for burner orifice diameters and thermostat heat anticipator settings.

Key Data from Tables: The tables provide detailed information on orifice drill bit sizes for natural gas and liquid propane across various elevations. Additionally, they specify the number and size of mixed-air and outdoor-air filters required for each unit.

Critical Information: Units are equipped with manual reset rollout switches, and the document highlights the importance of adhering to specified temperature rise ranges and manifold pressures for both natural gas and liquid propane.

Overview: This document provides technical specifications and selection procedures for gas heating units with vertical discharge, focusing on cooling and heating capacities, fan performance, and electrical characteristics.

Specifications:

Electrical Characteristics: 460-3-60
Unit Type: Gas Heating Vertical Discharge

Selection Procedures:

Cooling Capacity: Select the unit based on required cooling capacity. For a condenser entering temperature of 95°F, unit 48A3D040 at 16,000 cfm and 67°F ewb provides a total capacity of 485,000 Btuh and a sensible heat capacity (SHC) of 380,000 Btuh.
Heat Capacity: Unit 48A3D040 provides 324,000 Btuh with an input of 400,000 Btuh.
Supply Fan: At 1.4 in. wg and 16,000 cfm, the fan speed is 1063 rpm, requiring 19.06 bhp. A 20 hp motor is necessary.
Power Source: Ensure the unit corresponds to the available power source, which is 460-3-60.
Options and Accessories: In dry climates, an economizer is required per ASHRAE 90.1. Options include differential dry bulb changeover, outdoor air changeover, or differential enthalpy, but not outside air enthalpy.

Cooling Capacities: Detailed tables provide cooling capacities for various units (20, 25, 27, and 30 tons) at different air entering condenser temperatures and evaporator air quantities. Key parameters include total capacity (TC), sensible heat capacity (SHC), power consumption (kW), and bypass factor (BF).

Performance Data: Performance data is provided for different configurations and conditions, highlighting the importance of selecting the appropriate unit based on specific design requirements.

Fan Performance Specifications: The document provides detailed fan performance data for various units with different tonnage capacities (35, 40, 50, and 60 tons). It includes airflow rates (Cfm), available external static pressure (in. wg), and corresponding RPM and Brake Horsepower (Bhp) values. The data is organized in tables for easy reference.

Conversion and Efficiency: The conversion from Bhp to watts is given by the formula: Watts = Bhp x 746 / Motor efficiency. This is crucial for understanding the power requirements and efficiency of the fan motors.

Performance Notes:
1. Fan performance is based on wet coils, economizer, roof curb, cabinet losses, and clean 2-in. filters.
2. Variable air volume units can operate down to 70 cfm/ton, with performance limitations under certain conditions.

Motor Limitations and Standards: The document assures that the full horsepower range of the motors can be utilized without causing nuisance tripping or premature failures. All motors comply with the Energy Policy Act (EPACT) Standards effective October 24, 1997.

Premium-Efficiency Motors: Specifications for premium-efficiency motors are provided, including nominal and maximum efficiency, Bhp, BkW, and maximum amps for different voltage levels.

Air Quantity Limits: The document concludes with air quantity limits for specific models, ensuring that users understand the operational boundaries of the equipment.

Variable Air Volume Units: The units operate down to 70 cfm/ton in cooling mode, with performance limited to unloaded operation and potentially by entering dry bulb (edb) and entering wet bulb (ewb) conditions.

Air Quantity Limits: Operation may be limited by entering evaporator air wet bulb temperatures. Extensive testing ensures full motor horsepower utilization without affecting warranty.

Motor Compliance: All motors comply with Energy Policy Act (EPACT) Standards effective October 24, 1997.

Airflow Specifications: The document provides detailed airflow specifications for various unit sizes (48A2, A3, A4, A5) in both heating and cooling modes, with minimum and maximum airflow values specified for different configurations.

Electrical Data: Detailed electrical specifications are provided for units without and with convenience outlets, including voltage ranges, compressor and fan motor specifications, and power supply details for various unit sizes.

Key Tables: The document includes tables detailing minimum and maximum airflow, electrical data for different unit sizes, and power supply requirements, highlighting critical parameters such as RLA (Rated Load Amps), LRA (Locked Rotor Amps), FLA (Full Load Amps), MCA (Minimum Circuit Amps), and MOCP (Maximum Overcurrent Protection).

Electrical Specifications: The document provides detailed electrical specifications for various unit sizes (50A2, A3, A4, A5) with convenience outlets. It includes data on voltage range, compressor, condenser fan motor, evaporator fan motor, power exhaust, and optional electric heat power supply. The specifications are given for different voltage levels (208, 230, 460, 575) and include parameters like RLA (Rated Load Amperes), LRA (Locked Rotor Amperes), FLA (Full Load Amperes), and MCA (Minimum Circuit Amperes).

Control System: The 48/50A Series rooftops utilize the ComfortLink control system, which is designed for Carrier Commercial equipment. This system monitors operating conditions and controls components such as compressors, economizers, fans, and heat. It supports communication with Carrier Comfort Network® devices and other protocols like BACnet, MODBUS, and LonWorks. Key components include the Main Base Board (MBB), Economizer Control Board (ECB1), Supply and Building Pressure Control Board (ECB2), and CV Staged Gas Heat Board (SCB).

Legend and Notes: The document includes a legend and notes for understanding the electrical data tables. It emphasizes compliance with NEC requirements for multimotor and combination load equipment, recommending the use of fuse or HACR breakers. It also provides guidance on handling unbalanced 3-phase supply voltage, with a formula to calculate percent voltage imbalance.

Integrated Gas Controller (IGC): Each bank of gas heat exchangers is equipped with an IGC, which manages the direct spark ignition system and monitors various switches and sensors. It includes an LED for diagnostics.

Controls Expansion Module (CEM): An optional module that provides inputs for demand limiting, remote set points, and other optional inputs, located in the main control box.

Compressor Protection Cycle-LOC™ Board (CS): Monitors compressor status by sensing current flow and provides digital status signals to the Main Base Board (MBB).

Scrolling Marquee Display: A user interface for accessing control information, reading sensor values, testing the unit, and monitoring alarms. It features a 4-key, 4-character, 16-segment LED display with menu structures for various statuses and configurations.

Electrical Terms: Definitions for electrical terms such as FLA (Full Load Amps), LRA (Locked Rotor Amps), MCA (Minimum Circuit Amps), and others are provided.

Main Base Board (MBB) Inputs and Outputs: Detailed descriptions of input and output points, including their functions, plug and pin references, and signal states.

Cooling Control Options: The A Series ComfortLink controls offer various cooling control methods, including constant volume and VAV with multiple stages of cooling. The controls integrate economizers for free cooling and ensure safety limits are not exceeded.

Control Types: Different control configurations are described, such as VAV-RAT, VAV-SPT, CV/SAV TSTAT-Multiple Stage, and others, each with specific operational characteristics.

Cooling Control Methods: Three methods are used to manage cooling capacity, depending on unit size and configuration.

Cooling Control Methods:
1. Multiple Stage Evaporator Discharge Temperature (EDT): Utilizes an adaptive PID algorithm to control economizer and compressor capacity based on evaporator air discharge and supply air temperature set points.
2. Multiple Adaptive Demand: Adjusts capacity using evaporator air discharge temperature and supply air temperature set points, with modes for LOW COOL and HIGH COOL.
3. Two-Stage Demand: Operates with integrated economizer and two stages of compressor capacity control.
4. Integrated Economizer: Delays mechanical cooling to maximize free cooling, supplementing as needed.

Heating Control Options:
1. Two-Stage Control: Operates in LOW or HIGH HEAT mode based on demand inputs.
2. Multiple-Stage Control: Adjusts heating capacity based on set point and supply-air temperature, with staged gas control logic.
3. Tempering Mode: Used during ventilation or cooling modes to prevent low temperature air delivery.

Economizer and IAQ Options:
1. Economizer Modes: Supports outdoor air dry bulb, differential dry bulb, outdoor air enthalpy, differential enthalpy, and outdoor air dew point changeover.
2. Building Pressure Control: Includes relief dampers, non-modulating two-stage power exhaust, and modulating power exhaust.
3. Indoor Air Quality (IAQ): Modulates outside air damper position based on space CO2 levels, with optional outdoor air quality sensor integration.

Fire and Smoke Controls Interface:
Includes optional return air smoke detector and supports smoke control modes like evacuation, smoke purge, and pressurization.

Demand Limiting:
Supports fixed or variable capacity limits through discrete input switches or analog input signals.

Diagnostics:
Advanced diagnostics and prognostics with adaptive logic, storing last 10 alarms, and monitoring through Carrier Comfort Network®.

Control Interface:
Interfaces with i-Vu® Open Control System, BACnet, and other energy management systems. Provides multiple contact connection points for external controls.

Constant Volume/Staged Volume Applications:
Designed for CV/SAV™ applications, operable as stand-alone units with standard or programmable thermostats, or electronic room temperature sensors.

Overview: The document provides detailed technical specifications and operational procedures for a control system used in HVAC units. It covers interface connections, control features, sensor options, and sequence of operations for both constant volume and variable air volume applications.

Interface Connections: The system requires an optional controls expansion module (CEM) for enhanced functionality. Key connections include thermostat connections, field connections for various sensors and alarms, and communication interfaces for integration with Carrier Comfort Network (CCN).

Control Features: The system supports two-stage heating and cooling, with options for multiple stage gas heating and adaptive cooling. It includes economizer control for energy efficiency, indoor air quality (IAQ) sensor support, and a 365-day timeclock for scheduling. The control system can manage fan operations, compressor cycling, and economizer usage to optimize performance and reduce costs.

Sensor Options: Three sensor types are available: T55, T56, and T58, each offering different levels of control and override capabilities. These sensors help manage room temperature and provide unoccupied override functions.

Variable Air Volume (VAV) Applications: The units are designed for VAV applications, featuring a supply fan inverter to control fan speed and duct pressure. The system can operate in heating, vent, or cooling modes based on sensor inputs and configurable set points. It supports remote start/stop and demand limiting features.

Sequence of Operation: The document outlines the sequence of operations for cooling and heating modes, both for constant volume and staged air volume units. It describes how the system initializes, manages alarms, and controls fan speeds and compressor stages based on demand and sensor inputs.

Integration with CCN: When connected to a CCN system, the unit can participate in demand limiting, interface with building management systems, and allow remote configuration of schedules and set points.

Gas Heating Section (48 Series Only):

Induced-draft combustion with energy-saving direct spark ignition and redundant main gas valves.
Heat exchanger made of 20-gage steel with aluminum-silicone alloy coating for corrosion resistance; optional stainless steel available.
In-shot type burners made of aluminum-coated steel.
Single location gas piping entry.
Induced draft fans are direct-driven, single inlet, forward-curved centrifugal type, balanced and corrosion-resistant.
High-corrosion areas lined with corrosion-resistant material.

Refrigerant Components:

Dual refrigerant circuits with solid core filter drier, thermostatic expansion valve, and fusible plug.

Filter Section:

Standard 2-inch thick disposable fiberglass filters.

Controls and Safeties:

ComfortLink Controls with scrolling display, CCN capable, and various safety features including compressor lockout and protection mechanisms.
Automatic compressor lead/lag control and service diagnostic mode.
Optional integrated economizer control and multiple capacity stages.

Operating Characteristics:

Capable of starting and running at 115°F ambient temperature.
Operates in cooling down to 32°F outdoor temperature.
Fan time delay to prevent cold air delivery.

Electrical Requirements:

Single location power wiring entry.

Motors:

Compressor motors cooled by refrigerant gas with overload protection.
Condenser-fan motors are totally enclosed, 3-phase type with thermal overload protection.
Indoor fan and power exhaust motors meet EISA 2007 efficiency requirements.

Special Features:

Integrated Economizer meeting ASHRAE 90.1 requirements.
Barometric Relief Damper Package and Power Exhaust for pressure control.
Various optional features including thermostats, CO2 sensors, smoke detectors, and more.

General System Description:

Outdoor roof curb or slab mounted unit with hermetic scroll compressors for cooling and gas/electric heating.
Meets ASHRAE Standard 90.1-2010 EER requirements.

Quality Assurance:

Rated in accordance with AHRI Standard 340/360.
Conforms to ANSI/ASHRAE and UL standards.
Manufactured in ISO 9001 registered facility.

Delivery, Storage, and Handling:

Follow manufacturer’s recommendations.

Equipment:

Factory-assembled unit with all necessary components and features for field start-up.
Unit cabinet constructed of galvanized steel with baked enamel finish and insulated access panels.
Fans include indoor evaporator and condenser fans with specific construction and balancing requirements.

Variable Frequency Drive (VFD) Inverter:
The VFD is factory-installed inside the unit cabinet, controlling motor speed to maintain static pressure at the supply duct. It features full digital control, IGBT for quiet operation, self-diagnostics, security lockout, and RS485 capability. It includes electronic thermal overload protection and harmonic reduction features.

Compressors:
Fully hermetic scroll type with overload and short cycle protection, vibration isolation, and reverse rotation protection. Crankcase heaters activate only during off mode.

Coils:
Evaporator coils have aluminum fins bonded to copper tubes, while condenser coils are microchannel design. Coils are leak and pressure tested. Optional coatings are available for corrosion resistance.

Gas Heating Section (48 Series Only):
Features induced-draft combustion with direct spark ignition and redundant gas valves. Heat exchangers are corrosion-resistant, and burners are aluminum-coated steel.

Refrigerant Components:
Includes dual refrigerant circuits with solid core filter drier, thermostatic expansion valve, and fusible plug.

Filter Section:
Standard filters are 2-inch thick disposable fiberglass.

Controls and Safeties:
ComfortLink controls with scrolling display, CCN capability, and various safety features including compressor lockout and protection against high/low pressure and freeze conditions.

Operating Characteristics:
Capable of operating at 115°F and cooling down to 32°F. Includes fan time delay to prevent cold air delivery.

Electrical Requirements:
All power wiring enters at a single location.

Motors:
Compressor motors are refrigerant-cooled with overload protection. Condenser-fan motors are enclosed with thermal overload protection.

Special Features:
Includes options like integrated economizer, power exhaust, propane conversion kit, convenience outlet, and various sensors and communication options.

Manufacturer's Note:
Specifications and designs are subject to change without notice.

Catalog excerpts

Product Data WEATHERMAKER® 48/50A2,A3,A4,A5020-060 Single-Package Gas Heating/Electric Cooling Rooftop Units and Electric Cooling Rooftop Units with Optional Electric Heat with COMFORTLINK Controls and PURON® Refrigerant (R-410A) 20 to 60 Nominal Tons Carrier’s 48/50A Series commercial packaged rooftops offer: • Puron (R-410A) environmentally sound refrigerant • Novation® heat exchanger technology with microchannel coil • An easy-to-use, plain language display on the ComfortLink controls • EERs (energy efficiency ratios) meet ASHRAE (American Society of Heating, Refrigerating, and Air Conditioning Engineers) Standard 90.1-2010 • Meets ASHRAE Standard 62 • Constant, staged, or variable air volume • Communicating controls • Accurately match building loads with up to 5 steps of capacity • VFD (variable frequency drive) on all VAV (variable air volume) units and SAV™ (staged air volume) units • Mechanical cooling operation at outdoor ambient temperatures as low as 32 F (–20 F with optional Motormaster® V fan speed control) Carrier’s 48/50A commercial packaged unit offers design flexibility, quality, reliability, and ComfortLink controls. a48-8351 Copyright 2012 Carrier Corporation Design flexibility Dedicated vertical supply/return units (A2,A3) are ideal for new construction or retrofit to existing installations. The low unit profile is maintained when the unit is installed on the accessory roof curb. The ducts are attached directly to the roof curb to allow all ductwork to be completed before the unit is positioned. Form 48/50A-13PD

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Features/Benefits (cont) Dedicated horizontal units (A4,A5) are ideal for replacement or applications such as through-the-wall where sound must be attenuated before the duct penetrates the roof. Ducts connect directly to the unit. Horizontal units may be curb or slab mounted. ComfortLink controls Factory-installed ComfortLink controls provide the capability for free standing operation or it may be linked with a more extensive system. Factoryinstalled and programmed BACnet* communication capability provides simple integration with the building HVAC system (e.g., terminal devices), an i-Vu® Open...

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pressure for optimum supply fan energy savings. The VAV units have up to 5 stages of capacity control to match the load requirements of the conditioned space. Other VAV features include: • control of cooling and heating (if equipped with heat) in both occupied and unoccupied mode • support of optional space temperature sensor • control of modulating economizer to provide free cooling when outdoor conditions are suitable • support of IAQ (indoor air quality) sensor • support linkage to ComfortID™ VAV systems Staged air volume units utilize the VFD to allow for a configurable high and low fan speed....

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Features/Benefits (cont) ComfortLink controls expansion module (CEM). Staged gas unit heating The staged gas control option adds the capability to control the rooftop unit’s gas heating system to a specified supply air temperature set point for purposes of tempering a cool mixedair condition, or for reheat when the mechanical cooling is being used for dehumidification. The gas heating system employs multiple heating sections. Each section is equipped with a two-stage gas valve. The gas valves are sequenced by a factory-installed staged gas controller (SGC) as required to maintain the user-specified...

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Model number nomenclature 48A2,A3,A4,A5 UNITS 48 48 – Cooling Unit with Gas Heat Configuration A2 – CV/SAV Vertical with ComfortLink Controls and Puron® Refrigerant (R-410A) A3 – VAV Vertical with ComfortLink Controls and Puron Refrigerant (R-410A) A4 – CV/SAV Horizontal with ComfortLink Controls and Puron Refrigerant (R-410A) A5 – VAV Horizontal with ComfortLink Controls and Puron Refrigerant (R-410A) Heat Options D – Low Gas Heat E – High Gas Heat M – Low Gas Heat Stainless N – High Gas Heat Stainless S – Staged Low Gas Heat Stainless T – Staged High Gas Heat Stainless Unit Size - Nominal Tons...

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Model number nomenclature (cont) 50A2,A3,A4,A5 UNITS 50 Factory-Installed Options Refer to price pages for available option codes. Configuration A2 – CV/SAV Vertical with ComfortLink Controls and Puron® Refrigerant (R-410A) A3 – VAV Vertical with ComfortLink Controls and Puron Refrigerant (R-410A) A4 – CV/SAV Horizontal with ComfortLink Controls and Puron Refrigerant (R-410A) A5 – VAV Horizontal with ComfortLink Controls and Puron Refrigerant (R-410A) Packaging/Communication 1 – Domestic 3 – Export A – Domestic with BACnet Communication Option C – Export with BACnet Communication Option Heat...

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Ratings and capacities ELECTRIC RESISTANCE HEATER DATA UNIT 50A2,A3,A4,A5 020-035 LO HEAT 020-035 HIGH HEAT 040,050 LO HEAT 040,050 HIGH HEAT 060 LO HEAT 060 HIGH HEAT DESIGN RANGE NOTE: Due to the open design of the electric heaters, the airside pressure drop is negligible. *Operation at these levels may be limited by entering evaporator air wet bulb temperatures. See Cooling Capacities tables on pages 39-46 for further details. MAX CFM* 10,000 10,000 12,500 12,500 13,500 13,500 15,000 15,000 17,500 17,500 20,000 20,000 20,000 20,000 27,000 27,000 †Variable air volume units will operate down...

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Ratings and capacities (cont) CAPACITY CONTROL STAGING OPTIONS DEMAND SOURCE SAV/CV, Mech Thermostat COMPRESSOR SEQUENCE SIZE 020-027 UNITS SIZE 030-060 UNITS WITHOUT WITH WITHOUT WITH HOT GAS HOT GAS HOT GAS HOT GAS BYPASS BYPASS BYPASS BYPASS Table C Table D Table E Table F Table C Table D Table E Table F Table A NA Table B NA Table C Table D Table E Table F Table A NA Table B NA Table C Table D Table E Table F COOLING CONTROL METHOD Multiple Stage EDT Multiple Stage EDT 2 Stage Demand Multiple Adaptive Demand 2 Stage Demand Multiple Adaptive Demand LEGEND Constant Volume Evaporator Discharge...

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48A WEATHERMAKER®

48A WEATHERMAKER®

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