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Single-Package Rooftop
High Efficiency
Gas Heating/Electric Cooling Units
3 to 25 Nominal Tons
48HC Weathermaster Rooftop Unit

48HC WEATHERMASTER® rooftop unit were designed by customers for customers. With a gauge plug, centralized control center, plug & play accessory board, "no-strip screw" collars, and handled access panels, we’ve made the unit easy to install, easy to maintain, and easy to use. Units are pre-wired and pre-charged with environmentally sound Puron® (R-410A) refrigerant at the factory. The units are factory tested in both heating and cooling modes.

Performance Features
  • Puron® (R-410A) HFC refrigerant
  • ASHRAE 90.1 and Energy Star compliant
  • Single-stage capacity control (sizes 04 to 07)
  • Two-stage cooling capacity control (sizes 08 to 28)
  • SEERs up to 15.6
  • EERs up to 12.2
  • IEERs up to 13.0
  • Exclusive non-corrosive composite condensate pan in accordance with ASHRAE 62 Standard, sloping design; side or center drain
  • Gas efficiencies up to 82%
  • Induced draft combustion
  • Single and multi-state heating
  • Pre-painted exterior panels and primer-coated interior panels tested to 500 hours salt spray protection
  • TXV refrigerant metering device on each circuit with removable power element
  • Fully insulated cabinet
  • Enhanced copper tube and aluminum fin designed condenser and evaporator coils. Special coated coils also available
  • Exclusive IGC solid-state control for on-board diagnostics with LED error code designation, burner control logic and energy saving indoor fan motor delay
  • Dedicated 3-5 ton "Low NOx" models available that meet California Air Quality Management NOx requirement of 40 nangram/joule or ess. Low NOx models include stainless steel heat exchangers.
  • Standard cooling operating range up to 125 °F (52°C) and down to 35°F (-2°C). Low ambient controllers can bring cooling operation down to -20°F (-29°C)
  • Rated in accordance with ARI Standards 210/240 (sizes 04 to 06 ) and 340/360 (sizes 07 to 28)
  • Designed in accordance with Underwriters’ Laboratories Standard 1995
  • Listed by UL and UL, Canada, or ETL
Maintenance Features
  • Access panels with easy grip handles
  • Innovative , easy starting, no-strip screw feature on unit access panels
  • Two-inch disposable return air filters
  • Tool-less filter access door
  • Optional hinged access panels also available
  • Belt drive evaporator-fan motor and pulley combinations available on all three phase models to meet any application
  • Electric Drive x13 (5 speed/torque) motor on 04 to 06 models
  • New terminal board facilitating simple safety circuit troubleshooting and simplified control box arrangement
Installation Features
  • Field convertible from vertical to horizontal airflow for slab mounting (sizes 04 to 14)
  • Provisions for thru-the-bottom power entry capability as standard
  • Single point gas and electric connections
  • Full perimeter base rail with built-in rigging adapters and fork truck slots
  • Dedicated vertical and horizontal airflow models available (factory option on size 17 to 28 units)
Reliability Features
  • Scroll compressors with internal line-break overload protection
  • 24-volt control circuit protected with resettable circuit breaker
  • Permanently lubricated evaporator-fan motor
  • Totally enclosed condenser motors with permanently lubricated bearings
  • Low pressure and high-pressure switch protection
  • Exclusive IGC anti-cycle protection for gas heat operation
  • Solid-state electronic direct spark ignition system
  • Flame roll-out safety protector
  • Liquid line filter drier as standard
Standard Limited Warranty
  • 10 years parts only heat exchanger - aluminized
  • 15 years parts only heat exchanger - stainless steel
  • 5 years parts only compressor
  • One year parts only on all other parts
  • Extended warranty packages available
Category Item Factory Installed
Field Installed
Cabinet Thru -the-base electrical or gas-line connections Y Y
Hinged access panels Y  
Coil Options Cu/Cu indoor and/or outdoor coils Y  
Pre-coated outdoor coils Y
E-coated outdoor coils Y  
Humidity Control Humidi-MiZer Adaptive dehumidification system Y  
Condenser Protection Condenser coil hail guard (louvered design) Y Y
Controls Thermostats, temperature sensors, and subbases   Y
PremierLink™ DDC communicating controller Y Y
RTU-OPEN™ open-protocol controller Y  
Smoke detector (supply and/or return air) Y Y
Time Guard II compressor delay control circuit   Y
Economizers & Outdoor Air Dampers EconoMi$er IV (for electro-mechanical controlled RTUs) Y Y
EconoMi$er2 (for DDC controlled RTUs) Y Y
Motorized 2 position outdoor-air damper Y Y
Manual outdoor-air damper   Y
Barometric relief2 Y Y
Power exhaust   Y
Economizer Sensors & IAQ Devices Single dry bulb temperature sensors3 Y Y
Differential dry bulb temperature sensors3   Y
Single enthalpy sensors3 Y Y
Differential enthalpy sensors3   Y
CO2 sensor (wall, duct, or unit mounted)3 Y Y
Gas Heat Liquid propane (LP) conversion kit   Y
Stainless steel heat exchanger Y  
High altitude conversion kit   Y
Flue discharge deflector Y  
Indoor Motor & Drive Multiple motor and drive packages Y  
Low Ambient Control Winter start kit4   Y
Motormaster® head pressure controller4   Y
Power Options Convenience outlet (powered) Y  
Convenience outlet (unpowered) Y  
Non-fused disconnect Y  
Roof Curbs Roof curb 14” (356mm)   Y
Roof curb 24” (610mm)   Y

Refer to Product Data for further information.


1. Use in conjunction with specialized thermostat or controls device.
2. Included with economizer.
3. Sensors for optimizing economizer.
4. See application data for assistance.

Puron evironmentally sound refrigerantashrae90.1Energy star
AHRI standard 210/240 unitary small acAHRI standard 340/360 unitary large ac
C-UL-USC-UL-USQuality Assurance
Certified to ISO 9001

Additional Information
Physical data
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