Electric Cooling Units
With Puron® Refrigerant (R-410A)
20 to 60 Tons

50A2 – CV, Vertical
50A3 – VAV, Vertical
50A4 – CV, Horizontal
50A5 – VAV, Horizontal

Carrier “A” – Series Rooftop products are pre-wired and charged with refrigerant and tested in both cooling and heating modes at the factory.

All 50A models feature an industrial grade cabinet with fully hinged access panels. Superior supply fan performance with up to 3.5 in. external static pressure is standard.

They are available in dedicated vertical down shot and horizontal side supply/return airflow models. There are “A” Series models available for Constant Volume or Variable Air Volume applications. Units are available as cooling-only or with a variety of electric heat options.

All “A” Series units come standard with ComfortLink™ control and Scroll compressors on dual independent TXV controlled refrigeration circuits.

See more Carrier Packaged Rooftop Solutions. Carrier PACKAGED ROOFTOP 50A.


PerformanceReliabilityInstallationMaintenanceStandard WarrantyFactory-Installed OptionsField-Installed Accessories
  • High-efficiency scroll compressors.
  • TXV refrigerant metering device for each circuit.
  • Two-stage cooling on Constant Volume units, with multiple adaptive demand control for up to 5 stages of cooling capacity.
  • Cooling operation range up to 120° F ambient and down to 35° F ambient.
  • 115-volt and 24-volt control circuit.
  • Sloped, aluminized steel condensate pan.
  • Two-inch disposable-type return air filters (Optional four inch available).
  • Fixed speed belt-drive blower drive.
  • High-efficiency motors meet EPACT (Alternate motors are available).
  • Two-position outside air damper is standard, capable of admitting up to 25% outdoor air during fan operation, closed when the fan is off. Outside air hoods and permanent filters.
  • Meet or exceed the EER requirements of ASHRAE Standard 90.1.
  • Rated in accordance with ARI Standard 340/360.
  • Tested in accordance with UL Standard 1995.
  • Listed by ETL and ETL, Canada.
  • Variable Air Volume Units:
    • Adjustable speed drive with true torque control (VFD).
    • Soft start and anti-windmilling control.
    • Supply duct static pressure control.
    • Discharge air temperature control.
    • Supply air temperature reset.
    • Up to 6 steps of cooling capacity staging available with optional hot gas bypass.
  • ComfortLink™ control:
    • Easy to use Scrolling Marquee Display.
    • Time schedule.
    • Space temperature sensor capability.
    • Service diagnostics, alarms and alarm history.
    • CO2 sensor capability for Demand Control Ventilation (DCV).
    • Compressor reverse rotation protection.
    • Short-cycle compressor protection.
    • Self-diagnostic service and start up run test capability.
    • Carrier Comfort Network® communications or stand-alone operation.
    • Remote start/stop capability.
    • ComfortID™ system with 35 and 45 series PIC terminals.
  • Dual electrically and mechanically independent refrigeration circuits.
  • Crankcase heaters are standard on all models.
  • Compressor protection includes high and low pressure transducers with safety cutouts.
  • Coil frost protection.
  • Liquid line filter driers.
  • Circuit breaker protection for all power components.
  • Cabinet made of pre-painted, galvanized steel with baked enamel finish, which meets ASTM B117 salt spray resistance.
  • Condenser-fan motors are totally enclosed, with internal protection.
  • Single point electrical service entry, thru unit bottom or side.
  • Lifting lugs.
  • Large hinged service access doors.
  • Standard one-year warranty.
  • Five-year non pro-rated warranty on heat exchanger.
Electric Heat
Low electric heatYes
High electric heatYes
Indoor Air Quality
2-inch filtersYes
4-inch filtersYes
Return air CO2 sensorYes
Manual outside air self-closing damperYes
Modulating economizer 3-position damperYes
Exhaust Air Control
Barometric reliefVertical units only
Non-modulating power exhaustCV vertical units only
Modulating power exhaust and static sensorVertical units only
Condenser and Evaporator Coils
Al/Cu condenser & evaporatorYes
Al/Cu Pre-coat condenser & Al/Cu evaporatorYes
Al/Cu E-coat condenser & Al/Cu evaporatorYes
Cu/Cu condenser & Al/Cu evaporatorYes
Hot gas bypassYes
Galvanized drain panYes
Stainless drain panYes
Controls option boardYes
Return air CO2 sensorYes
Return air smoke detectorYes
Filter switchYes
Power Circuit
GFI convenience outlet (powered)Yes
GFI convenience outlet (not powered)Yes
Power terminal blockYes
Non-fused disconnectYes
Indoor Motor Options
Low HP, standard efficiencyYes
Medium HP, standard efficiencyYes
High HP, standard efficiencyYes
Low HP, high efficiencyYes
Medium HP, high efficiencyYes
High HP, high efficiencyYes
Indoor Air Quality
Return air CO2 sensorYes
CO2 space sensorYes
CO2 aspirator boxYes
Outdoor or return humidity sensor (enthalpy)Yes
Exhaust Air Control
Barometric reliefYes
Non-modulating power exhaustYes
Modulating power exhaust and static sensorYes
Supply and building pressure control boardYes
Build pressure control sensorYes
Condenser and Evaporator Coils
Condenser coil hail guard assemblyYes
Controls option boardYes
Enhanced displayYes
Navigator™ displayYes
Return air CO2 sensorYes
Supply smoke detectorYes
Filter switchYes
Fan status switch (requires options board)Yes
T55 thermostatYes
T56 thermostatYes
T58 sensorYes
Space temperature sensor with CO2 overrideYes
Space temperature sensor setpoint and CO2 overrideYes
Remote enhanced displayYes
Thermostats (Debonair®)CV units only
Thermostats (Slimline)CV units only
Thermostats (Corporate)CV units only
BACnet/MODBUS Carrier translatorYes
LonWorks Carrier translatorYes
Miscellaneous Options
Roof curb adapter kitYes
14-inch roof curbYes
Low ambient control (Motormaster® V )Yes


Product Data

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