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Single Package Rooftop
Standard Efficiency
Electric Cooling Units
15 to 25 Tons
48TJ Rooftop Unit

The 50TJ units are one-piece rooftop cooling units or onepiece heating/cooling units utilizing either electric heat or a hydronic heating coil. Units are pre-wired and pre-charged with R-22 at the factory. Units are factory tested in both heating and cooling modes.

Performance Features
  • Each unit features two independent refrigerant circuits with a scroll compressor on each circuit. Refrigerant metering devices for each circuit are TXVs
  • Two-inch, disposable-type fiberglass return air filters
  • Two-stage cooling
  • Low outdoor temperature cooling operation to 40° F is standard
  • Automatic changeover (when used with auto-changeover thermostat)
  • Adjustable speed main blower drives
  • Liquid line filter driers
  • Rated in accordance with ARI Standard 360
  • Designed in accordance with UL Standard 1995
  • Listed by ETL
Maintenance Features
  • Single point electrical service entry
Installation Features
  • Manually adjustable outside air intake for up to 25% outside air
  • Provision for horizontal return standard on base unit
Reliability Features
  • Compressor protection includes high and low-pressure cutouts and overtemperature protection
  • Dual freezestat protection
  • Condenser fan motors are internally protected
  • Control circuit protected by circuit breaker
  • Cabinet made of Weather Armor pre-painted, baked enamel finish and insulated with neoprene-coated fiberglass
  • Spring return on power-loss EconoMi$er IV
Standard Limited Warranty
  • Standard one-year product warranty
  • Five-year warranty on size 016 compressors
  • One-year warranty on size 020-028 compressors
  • Five-year warranty on factory-installed electric heaters
Factory Installed OptionField Installed Accessory
25% open two-position damperYes
Barometric relief damper (not for use with horizontal roof curb)Yes
Condenser coil hail guard assembly (sizes 016-025)Yes
Convenience outlet (load side)Yes
Copper fins indoor and outdoor coilYes
Copper fins outdoor coilYes
E-coat outdoor coil (aluminum)Yes
E-coat outdoor coil (copper)YesYes
EconoMi$er IV with corporate controlsYesYes
EconoMi$er2 (for use with PremierLink™ or third party controls)Yes
EconoMi$er2 hinged panel kitYes
Electric heatYes
Electronic programmable thermostatYes
Enthalpy or differential enthalpy sensorYes
Fan/filter statusYes
High-static motor and driveYes
Hinged access panelsYes
Horizontal adapter curb (sizes 016-025)Yes
Hydronic glycol coilYes
Indoor air quality (CO2) sensorYes
Light commercial Thermidistat™ deviceYes
Low ambient kitYes
Manual outdoor-air damperYes
MoistureMi$er™ dehumidification packageYes
Motormaster® I, V head pressure controlYes
Novar controlYes
Outdoor air enthalpy sensorYes
Power exhaust without barometric reliefYes
Pre-coat aluminum fins on outdoor coilYes
PremierLink DDC communicating controlYesYes
Return air enthalpy sensorYes
Return air temperature sensorYes
Roof curbs (vertical and horizontal discharge)Yes
Thermostats and subbasesYes
Time Guard II control circuit (compressor cycle delay)Yes
Unit-mounted non-fused disconnectYes
Winter start time delayYes
AHRI standard 340/360 unitary large acCanada, us etlc-etl
460v Units
All Units

Additional Information
Physical data
Coil Protection
Hinged Panels
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