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Carrier| Commercial Systems North America
48LC WEATHEREXPERT®

48LC WEATHEREXPERT®

Product catalog summary

Features and Benefits:
Carrier's 48LC rooftop units are designed for high efficiency, ease of use, installation, and maintenance. They offer SEER ratings up to 17.5, exceeding ASHRAE 90.1 and Energy Star standards, and meet CEE Tier 2 levels. These units are field-convertible for horizontal airflow and compatible with existing Carrier curbs from 1989, facilitating replacements without additional modifications. Maintenance is simplified with easy access handles and a "no-strip" screw system.

Model Number Nomenclature:
The model number provides detailed information about the unit's specifications, including unit type, electrical options, heat size, service options, air intake/exhaust options, cooling tons, base unit controls, sensor options, voltage, coil options, and indoor fan options.

Factory Options and Accessories:
Options include economizers for energy savings, CO2 sensors for demand control ventilation, smoke detectors for safety, louvered hail guards for condenser protection, and convenience outlets for service ease. The RTU Open Multi-Protocol Controller allows integration with existing building automation systems.

AHRI Cooling Rating Tables:
These tables provide detailed performance metrics for the units under various conditions, ensuring compliance with industry standards.

Sound Performance Table:
Details the sound levels of the units, with outdoor sound levels reaching up to 76 dB, ensuring quiet operation.

Physical Data:
Includes dimensions, weights, and other physical specifications necessary for installation and operation.

Application Data:
Guidelines for optimal unit application, including environmental considerations and installation tips.

Sequence of Operation:
Describes the operational sequence of the unit, including cooling and heating cycles, to ensure efficient and effective performance.

Guide Specifications:
Provides detailed specifications for architects and engineers to ensure proper integration into building designs.

Specifications and Features:
1. Manual and Two Position Dampers: Not recommended due to complex control logic required for 2-speed indoor fan systems.
2. Hinged Access Panels: Provide access to major components with quarter turn latches and lift tabs.
3. Propane and High Altitude Heating: Conversion kits available for propane and high altitude applications to maintain optimal combustion.
4. Flue Discharge Accessories: Includes deflectors and heat shields to manage flue gas recirculation and safety.
5. HACR Breaker: Provides overload and short circuit protection, suitable for WYE power systems only.
6. Alternate Motors and Drives: Options available for different horsepower and airflow requirements.
7. Thru-the-Base Connections: Ensures proper sealing for wire and piping connections.
8. ComfortLink Controls: Offers diagnostics, operation setup, and control logic for VAV applications with features like temperature and humidity control, reliability, and diagnostics.

Performance Ratings:
1. Cooling Ratings: Tables provided for 2-stage cooling with direct drive ECM and belt drive indoor motors, detailing capacity, power, SEER, and EER.
2. Heating Ratings: Tables for natural gas, propane, and low NOx heat exchangers, detailing input/output, temperature rise, and efficiency.
3. Sound Performance: Outdoor sound levels measured in decibels across various frequencies.
4. Airflow Ratings: Minimum and maximum airflow ratings for cooling and heating modes.

Physical and Dimensional Data:
1. Refrigeration System: Details on stages, compressor type, refrigerant charge, and pressure settings.
2. Evaporator and Condenser Coils: Material, coil type, rows, and face area specifications.
3. Fan and Motor Specifications: Details on motor type, drive, RPM range, and fan dimensions.
4. Gas Connection and Heat Settings: Information on gas valves, pressure settings, and temperature rise ranges.
5. Service Clearance and Roof Curb Details: Dimensions and installation notes for proper unit placement and service access.

Options and Accessories:
1. Weights: Listed for various options and accessories like power exhaust and economizers.

Specifications:
The document provides detailed specifications for various components and accessories used in Carrier rooftop units. These include hail guards, condenser coils, roof curbs, CO2 sensors, smoke detectors, and more. Each component is listed with its dimensions and weight.

Operating Conditions:
The minimum operating ambient temperature for cooling is 10°F (-12°C) with mechanical controls and 0°F (-18°C) with ComfortLink controls. The maximum operating temperature is 125°F (52°C). For heating, the minimum mixed air temperatures are specified for different materials, and airflow limits are provided to ensure safe operation.

Airflow and Changeover:
The units operate in draw-through mode for cooling and blow-through mode for heating. Automatic changeover from heating to cooling is possible with appropriate thermostats or sensors.

Economizers and Motor Limits:
Economizers are recommended for reducing operating expenses and providing ventilation. Carrier motors are designed to use the full horsepower range without additional safety factors.

Propane and High Altitude Heating:
Different burner orifices are required for propane and high-altitude applications to maintain proper fuel/air mixtures. Adjustments are necessary for altitudes above 2000 ft (610 m).

Sizing and Low Ambient Applications:
Proper sizing of air conditioners is crucial to avoid issues like poor humidity control and increased utility bills. Carrier units can operate in low ambient conditions with specific controls.

Cooling Capacities:
Tables provide detailed cooling capacities for different ambient temperatures and airflow rates. These include total and sensible heat capacities for various configurations and stages of operation.

Fan Performance Specifications:
The document provides detailed fan performance data for various models, including RPM, BHP, and CFM at different static pressures. Key highlights include:

Medium static fans operate between 1035-1466 RPM with a maximum of 2.4 BHP.
High static fans operate between 1303-1687 RPM with a maximum of 2.9 BHP.

Pulley Adjustment:
Details on motor pulley adjustments for different static settings are provided, indicating RPM changes with pulley turns.

Electrical Information:
Electrical specifications for units of 3, 4, and 5 tons are outlined, including voltage ranges, RLA, LRA, and efficiency at full load. Notable points include:

Voltage ranges for 208-3-60, 230-3-60, 460-3-60, and 575-3-60 configurations.
Efficiency varies with fan speed settings (Standard, Medium, High).

MCA/MOCP Determination:
Minimum Circuit Ampacity (MCA) and Maximum Overcurrent Protection (MOCP) values are provided for units with and without powered convenience outlets. The document specifies:

Different MCA and MOCP values based on fan type and power configurations.
Separate tables for units with and without powered convenience outlets.

Sequence of Operation:
The sequence of operation for electromechanical units is described, covering cooling, heating, and ventilation processes. Key points include:

Cooling involves energizing specific terminals and contactors to start fan motors and compressors.
Heating involves a sequence of checks and activations to ensure safe operation, with a focus on gas ignition and fan operation.
Ventilation uses two-speed indoor fans, with low speed for standard operation.
Units with economizers modulate outdoor-air dampers based on temperature and CO2 levels for efficient cooling and ventilation.

Overview: The document provides detailed technical specifications and operational sequences for HVAC systems, specifically focusing on the EconoMi$er X and ComfortLink controls in WeatherExpert (48LC) units. It covers cooling, heating, dehumidification, and free cooling operations, along with guide specifications for installation and quality assurance.

Cooling Operation: The system uses a staged approach to cooling, modulating fan speeds and compressor stages based on demand. The EconoMi$er X damper modulates to maintain a mixed-air temperature setpoint, and compressor stages are activated as needed. Fan speeds adjust according to cooling demand, supply air temperature, and refrigerant suction temperature.

Heating Operation: The heating sequence mirrors that of an electromechanical unit without an economizer, with the economizer remaining at a minimum position during fan operation.

Advanced Operation with ComfortLink Controls: ComfortLink controls offer multiple fan speeds and support various control inputs like thermostats and space sensors. The system adjusts fan speeds and compressor stages to optimize energy efficiency and occupant comfort.

Dehumidification Control: Optional dehumidification is achieved through sensors or switches, with three control types: no control, maximum dehumidification, and maximum comfort dehumidification. The economizer damper position is limited during dehumidification demand.

Free Cooling Operation: During free cooling, fan speeds adjust based on economizer position, with compressors activated after certain conditions are met.

Guide Specifications: The document includes detailed specifications for gas heat/electric cooling packaged rooftop units, covering size range, insulation, control devices, and safety features. It emphasizes compliance with standards like ASHRAE, NFPA, and UL, and outlines requirements for instrumentation, control systems, and quality assurance.

Quality Assurance: Units must meet ASHRAE 90.1 efficiency requirements, be Energy Star certified, and conform to various industry standards. The document specifies testing and certification requirements, including salt spray exposure and manufacturing standards.

Specifications:
1. The unit must comply with ISO 9001 standards and be designed according to NRCA standards for roof curbs. It should also meet UL Standard 1995, ensuring it can withstand rain and prevent snow intrusion up to 40 mph.
2. The unit must undergo a fully automated run test, with data stored at the factory and available upon request.
3. The unit should be shake tested to ASTM D4169 assurance level 1 for shipping reliability.

Delivery, Storage, and Handling:
1. Units must be stored and handled as per manufacturer recommendations, lifted by crane using shipping top panel or spreader bars, and stored upright.

Project Conditions:
1. Conditions as specified in the contract.

Operating Characteristics:
1. The unit should operate at 125°F (52°C) ambient temperature and meet AHRI Standard 210/240 load criteria.
2. It should start at 10°F (-12°C) with standard controls and below 0°F (-18°C) with ComfortLink controls.
3. The unit should support vertical or horizontal air discharge and be convertible between these configurations.

Electrical Requirements:
1. Main power supply must match manufacturer specifications.

Unit Cabinet:
1. Constructed of galvanized steel with a pre-painted enamel finish, meeting specific thickness and hardness standards.
2. Insulation must conform to AHRI standards, with specific requirements for interior surfaces.
3. Base rails and condensate pans must meet specific construction and compliance standards.

Gas Heat:
1. Heat exchangers must be induced draft design with direct-spark ignition and redundant gas valves.
2. The unit should have an integrated gas controller with fault notification via LED.
3. Optional stainless steel and low NOx heat exchangers are available.

Coils:
1. Standard coils have aluminum fins and copper tubes, tested to specific pressure standards.
2. Optional coatings and materials are available for enhanced durability and corrosion resistance.

Refrigerant Components:
1. Includes thermostatic expansion valve, filter drier, and service gauge connections.
2. Compressors are hermetic scroll type with protection features and crankcase heaters.

Filter Section:
1. Filters are factory-installed, low velocity, and throw-away type, with easy access and replacement.

Evaporator Fan and Motor:
1. Features include permanently lubricated bearings, thermal overload protection, and multi-speed motor options.
2. Optional belt-driven fans with VFD controllers are available.

Condenser Fans and Motors:
1. Motors are totally enclosed with thermal overload protection.
2. Fans are direct-driven propeller type with aluminum blades.

Special Features Options and Accessories:
1. Integrated economizers are available for specific models, with options for vertical or horizontal return configurations.

Economizer Specifications:

Includes hardware and controls for free cooling with outdoor air when conditions are favorable.
Equipped with gear-driven dampers for outdoor and return air control, with low-leakage dampers not exceeding 2% leakage at 1 in. wg pressure differential.
Honeywell W7212 controller for electromechanical units, providing damper position control and LED indicators for various modes.
Ultra low leak EconoMi$er X system available for models with SAV 2-speed VFD systems, meeting ASHRAE 90.1 requirements.
Capable of introducing up to 100% outdoor air and equipped with a barometric relief damper for return air.
Includes a dry bulb outdoor air temperature sensor with adjustable setpoints.
Controller provides control for accessory power exhaust unit and maintains minimum airflow during occupied periods.
Accepts 2-10 Vdc CO2 sensor input for IAQ/DCV control.

Additional Components:

Propane Conversion Kit: Converts natural gas units for use with liquefied propane up to 2000 ft elevation.
Flue Shield: Protects from hot sides of the gas flue hood.
Condenser Coil Hail Guard: Louvered style for hail protection.
Unit-Mounted, Non-Fused Disconnect Switch: Provides power shutoff, accessible from outside the unit.
Convenience Outlet: Powered and non-powered options available, with GFI receptacles and independent fuse protection.
Flue Discharge Deflector: Directs exhaust vertically, defined as a "natural draft" device.
Thru-the-Base Connectors: Allows gas and electrical connections through the unit basepan.
Propeller Power Exhaust: Used with an integrated economizer, available for vertical or horizontal configurations.
Roof Curbs: Full perimeter with exhaust capability, supporting entire unit weight.
High Altitude Gas Conversion Kit: Converts units for operation at higher elevations with natural gas or propane.
Outdoor and Return Air Enthalpy Sensors: Provide single and differential enthalpy control for free cooling.
Indoor Air Quality (CO2) Sensor: Available in various mounts, provides demand ventilation control.
Smoke Detectors: Factory-installed, with environmental compensation and multiple fan shutdown capabilities.
Time Guard: Prevents compressor short cycling with a 5-minute delay.
Hinged Access Panels: Easy access to major components with integrated latches.

Catalog excerpts

Ultra High Efficiency Gas Heat/Electric Cooling Packaged Rooftop Product Data Carrier's Most Efficient Commercial Rooftop Ever!

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TABLE OF CONTENTS PAGE MODEL NUMBER NOMENCLATURE . . . . . . . . . . . . 5 FACTORY OPTIONS AND/OR ACCESSORIES . . . . . 7 ECONO, BARO RELIEF & PE PERFORMANCE . . . 26 AHRI COOLING RATING TABLES . . . . . . . . . . . . . . . 9 SOUND PERFORMANCE TABLE . . . . . . . . . . . . . . . 10 CURBS & WEIGHTS DIMENSIONS . . . . . . . . . . . . . 13 OPTIONS AND ACCESSORY WEIGHTS . . . . . . . . . 17 Carrier’s rooftop units (RTU) are designed by customers for customers. These new WeatherExpertt models are Carrier’s highest efficient models ever produced and not only help reduce energy cost while providing...

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CARRIER’S MOST EFFICIENT COMMERCIAL ROOFTOP EVER DESIGNED Ideal for Replacement or New Construction 1. Full perimeter base rails with built in rigging provisions. Unit has the same footprint as the current standard efficiency and high efficiency models. Units fit on the same Carrier roof curb dating back to the late 1980’s making it ideal for replacement and new construction. 2. Electrical mechanical controls, RTU Open multi protocol or ComfortLink integrated controls that provides: - Scrolling marquee display - Reverse rotation protection - Service diagnostics and alarms - Alarm and run time...

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UNIT FEATURES S Two stage cooling capacity control scroll compressors with crankcase heater S Belt drive indoor fan and pulley system with Variable Frequency Drive (VFD) motor controller and display or direct drive (multi speed/torque) ECM motor. S SEER up to 17.5 with direct drive ECM indoor fan motor, up to 16.4 SEER with belt drive/VFD indoor fan motor S Electro- mechanical controls that provide cooling operation down to 10_F (- 12_C) - S Optional ComfortLink Controls that provide cooling operation down to 0_F (- 18_C) and: - Communications via stand alone thermostat or sensor - Scrolling...

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MODEL NUMBER NOMENCLATURE 1 Unit Type 48 = Gas Heat Packaged Rooftop Brand / Packaging 0 = Standard 1 = LTL Electrical Options A = None B = HACR Breaker C = Non--- fused disconnect D = Thru the base connections E = HACR Breaker & thru the base F = Non--- fused & thru the base Model Series---WeatherExpert LC = Ultra High Efficiency Heat Size D = Low gas heat E = Medium gas heat F = High gas heat L = Low NOx, low gas heat M = Low NOx, medium gas heat N = Low NOx, high gas heat S = Low heat with stainless steel exchanger R = Med heat with stainless steel exchanger T = High heat with stainless steel...

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Table 1 – FACTORY- INSTALLED OPTIONS AND FIELD- INSTALLED ACCESSORIES CATEGORY Cabinet Coil Options Condenser Protection Economizers & Outdoor Air Dampers Economizer Sensors & IAQ Devices Indoor Motor & Drive Power Options Roof Curbs FACTORY INSTALLED OPTION ITEM Thru ---the ---base electrical or gas---line connections Hinged access panels Cu/Cu indoor and/or outdoor coils Pre ---coated outdoor coils Premium, E ---coated outdoor coils Condenser coil hail guard (louvered design) Thermostats, temperature sensors, and subbases ComfortLink Controls RTU Open Multi ---Protocol Controller Smoke detector...

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FACTORY OPTIONS AND/OR ACCESSORIES Economizer (dry-bulb or enthalpy) Non-fused Disconnect Economizers save money. They bring in fresh, outside air for ventilation; and provide cool, outside air to cool your building. This is the preferred method of low- ambient cooling. When coupled to CO2 sensors, economizers can provide even more savings by coupling the ventilation air to only that amount required. This OSHA- compliant, factory- installed, safety switch allows a service technician to locally secure power to the rooftop. Economizers include gravity controlled, barometric relief equalizes building...

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FACTORY OPTIONS AND/OR ACCESSORIES (cont.) Flue Discharge Deflector Thru- the- Base Connections - The flue discharge deflector is a useful accessory when flue gas recirculation is a concern. By venting the flue discharge upwards, the deflector minimizes the chance for a neighboring unit to intake the flue exhaust. Thru- the- base connections, available as either an - accessory or as a factory option, are necessary to ensure proper connection and seal when routing wire and piping through the rooftop’s basepan and curb. These couplings eliminate roof penetration and should be considered for gas...

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COOLING STAGES 2- STAGE COOLING W/DIRECT DRIVE ECM INDOOR MOTOR - Table 3 – AHRI COOLING RATING TABLE 48LC COOLING STAGES LEGEND ----- Not Applicable AHRI --- Air Conditioning, Heating and Refrigeration Institute Test Standard ASHRAE --- American Society of Heating, Refrigerating and Air Conditioning, Inc. EER --- Energy Efficiency Ratio SEER --- Seasonal Energy Efficiency Ratio 2- STAGE COOLING WITH BELT DRIVE INDOOR MOTOR NET COOLING CAPACITY (MBH) 34.6 46.5 58.0 NOTES: 1. Rated in accordance with AHRI Standards. 2. Ratings are based on: Cooling Standard: 80_F (27_C) db, 67_F (19_C) wb indoor...

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Table 5 – HEATING RATING TABLE - LOW NOX1 48LC LOW MED HIGH LOW MED HIGH LOW MED HIGH THERMAL EFFICIENCY (%) --- Not Applicable NOTE: 1. Units meet California’s South Coast Air Quality Management District (SCAQMD) Low ---NOx emissions requirement of 40 nanograms per joule or less. NOTES: 1. Outdoor sound data is measure in accordance with AHRI. 2. Measurements are expressed in terms of sound power. Do not compare these values to sound pressure values because sound pressure depends on specific environmental factors which normally do not match individual applications. Sound power values are independent...

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# Stages/ # Comp. / Type R--- 410A charge A/B (lbs --- oz) Metering device High--- press. Trip / Reset (psig) Low--- press. Trip / Reset (psig) Material Coil type Rows / FPI Total Face Area (ft2) Condensate Drain Connection Size Standard Static Motor Qty / Drive type Max BHP RPM range Motor Frame Size Fan Qty / Type Fan Diameter (in) Medium Static Motor Qty / Drive type Max BHP RPM range Motor Frame Size Fan Qty / Type Fan Diameter (in) High Static Table 8 – PHYSICAL DATA Motor Qty / Drive type Max BHP RPM range Motor Frame Size Fan Qty / Type Fan Diameter (in) Refrigeration System Evaporator...

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48LC WEATHEREXPERT®

48LC WEATHEREXPERT®

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