Packaged Rooftop 50A

Packaged Rooftop
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.

Performance Features

  • 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

Maintenance Features

  • Large hinged service access doors

Installation Features

  • Single point electrical service entry, thru unit bottom or side
  • Lifting lugs

Reliability Features

  • 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

Standard Limited Warranty

  • Standard one-year warranty
  • Five-year non pro-rated warranty on heat exchanger
Factory Installed Options

Electric Heat  
Low electric heat Yes
High electric heat Yes
Indoor Air Quality  
2-inch filters Yes
4-inch filters Yes
Return air CO2 sensor Yes
Manual outside air self-closing damper Yes
Modulating economizer 3-position damper Yes
Exhaust Air Control  
Barometric relief Vertical units only
Non-modulating power exhaust CV vertical units only
Modulating power exhaust and static sensor Vertical units only
Condenser and Evaporator Coils  
Al/Cu condenser & evaporator Yes
Al/Cu Pre-coat condenser & Al/Cu evaporator Yes
Al/Cu E-coat condenser & Al/Cu evaporator Yes
Cu/Cu condenser & Al/Cu evaporator Yes
Hot gas bypass Yes
Galvanized drain pan Yes
Stainless drain pan Yes
Controls option board Yes
Return air CO2 sensor Yes
Return air smoke detector Yes
Filter switch Yes
Power Circuit  
GFI convenience outlet (powered) Yes
GFI convenience outlet (not powered) Yes
Power terminal block Yes
Non-fused disconnect Yes
Indoor Motor Options  
Low HP, standard efficiency Yes
Medium HP, standard efficiency Yes
High HP, standard efficiency Yes
Low HP, high efficiency Yes
Medium HP, high efficiency Yes
High HP, high efficiency Yes
Field-Installed Accessories


Indoor Air Quality  
Return air CO2 sensor Yes
CO2 space sensor Yes
CO2 aspirator box Yes
Outdoor or return humidity sensor (enthalpy) Yes
Exhaust Air Control  
Barometric relief Yes
Non-modulating power exhaust Yes
Modulating power exhaust and static sensor Yes
Supply and building pressure control board Yes
Build pressure control sensor Yes
Condenser and Evaporator Coils  
Condenser coil hail guard assembly Yes
Controls option board Yes
Enhanced display Yes
Navigator™ display Yes
Return air CO2 sensor Yes
Supply smoke detector Yes
Filter switch Yes
Fan status switch (requires options board) Yes
T55 thermostat Yes
T56 thermostat Yes
T58 sensor Yes
Space temperature sensor with CO2 override Yes
Space temperature sensor setpoint and CO2 override Yes
Remote enhanced display Yes
Thermostats (Debonair®) CV units only
Thermostats (Slimline) CV units only
Thermostats (Corporate) CV units only
BACnet/MODBUS Carrier translator Yes
LonWorks Carrier translator Yes
Miscellaneous Options  
Roof curb adapter kit Yes
14-inch roof curb Yes
Low ambient control (Motormaster® V ) Yes

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