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Single-Package Rooftop
Gas Heating/Electric Cooling Units
3 to 12½ Nominal Tons

48/50TM 6 to 12.5 Tons

48TM units are single-packaged electric cooling with gas heating. Units are pre-wired and pre-charged with R-22 (HCFC), and are factory tested in both heating and cooling modes.

Standard Features:
  • All models comply with ASHRAE 90.1 minimum efficiency requirements
  • SEERs up to 10.0. EERs to 10.1
  • Single compressors on 3 to 6 ton sizes
  • Dual compressors on 7-1/2 to 12-1/2 ton sizes
  • Convertible from vertical to horizontal airflow for slab mounting
  • Copper tube aluminum fin coils with corrosion resistant options
  • Pre-painted exterior panels and primer-coated interior panels
  • Acutrol™ refrigerant metering system
  • Exclusive non-corrosive composite condensate pan in accordance with ASHRAE 62 Standard, sloping design; side or center drain
  • Automatic changeover when used with auto-changeover thermostat
  • Low outdoor temperature cooling operation to 25° F
  • Maximum outdoor temperature cooling operation:
    • 115° F for sizes 004-008, 012
    • 125° F for sizes 009, 014
  • Exclusive IGC solid-state control for on-board diagnostics with LED error code designation, burner control logic, energy saving indoor fan motor delay and induced draft combustion
  • Low NOx models that meet California Air Quality Management NOx specifiications
  • Redundant gas valves, with up to two stages of heating
  • Rated in accordance with ARI Standards 210 (004-006 sizes) and 360 (007-014 sizes)
  • Designed in accordance with Underwriters' Laboratories Standard 1995
  • Listed by UL and UL, Canada
Maintenance Features
  • Two-inch disposable return air filters
  • Tool-less filter access door
  • Belt drive evaporator-fan motors with adjustable pulleys
Installation Features
  • Thru-the-bottom power entry capability standard
  • Single point gas and electric connections
  • Full perimeter base rail with built-in rigging adapters and fork truck slots
Reliability Features
  • Scroll compressors with internal linebreak overload protection (Sizes 007, 009, 012 and 014
  • 24-volt control circuit protected with resettable circuit breaker
  • Permanently lubricated evaporator-fan motor
  • Totally enclosed condenser motors with permanently lubricated bearings
  • Loss of charge, freeze protection, and high-pressure switches
  • Solid-state electronic direct spark ignition system
  • Flame roll-out safety protector
Standard Limited Warranty
  • 5-year heat exchanger
  • 5-year compressor
  • 1-year parts
Factory Installed OptionField Installed Accessory
100% open two-position damperY
25% open two-position damperY
Condenser coil grille Y
Condenser coil hail guard assemblyY
Convenience outlet (load side)Y
Copper fins indoor and outdoor coilY
Copper fins outdoor coilY
E-coat outdoor coil (aluminum)Y
E-coat outdoor coil (copper)Y
EconoMi$er IV with controllerYY
EconoMi$er2 (for use with PremierLink or third party controls)YY
Electronic programmable thermostatY
Energy$Recycler™ mounting kitY
Energy$Recycler supply air blowerY
Energy$Recycler transformer for 460 vY
Energy$Recycler transformer for 575 vY
Energy$Recycler unitY
Enthalpy or differential enthalpy sensorY
Fan/filter statusY
Flue discharge deflectorY
Flue shieldY
High-static motor and driveY
Hinged panel kit for economizerY
Indoor air quality (CO2) sensorY
Light commercial Thermidistat™ deviceY
Low NOx (sizes 004-006)Y
LP (liquid propane) conversion kitY
Manual outdoor-air damperY
Motormaster® I, II, IV head pressure control (low ambient kit)Y
Novar controlY
Outdoor air enthalpy sensorY
Power exhaust transformer for 575 vY
Power exhaust with barometric reliefY
Pre-coat aluminum fins on outdoor coilY
PremierLink™ DDC communicating controlYY
Return air CO2 sensor (EconoMi$er IV only)Y
Return air enthalpy sensorY
Return air temperature sensorY
Roof curbs (vertical and horizontal discharge)Y
Thermostats and subbasesY
Thru-the-bottom utility connectionsY
Time Guard II (compressor cycle delay) control circuitY
Unit-mounted non-fused disconnectY
ashrae90.1AHRI standard 210/240 unitary small acAHRI standard 340/360 unitary large ac

Additional Information
Physical data
RTU-MP Controller
Coil Protection
Hinged Panels
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