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48HJ WEATHERMASTER®

Single-Package Rooftop
High-Efficiency
Gas Heating/Electric Cooling Units
18 to 25 Nominal Tons


Carrier HVAC Equipment 48HJ Rooftop Unit

48HJ units are one-piece high-efficiency rooftop cooling units with gas heat; all units are pre-wired and pre-charged with R-22 at the factory. Units are factory tested in both heating and cooling modes.

The 48HJD is low heat, 48HJE is medium heat, and the 48HJF model is high heat. The 48HJ is available in vertical airflow or side by side horizontal airflow models.

All 48HJ units come standard with electro-mechanical controller and scroll compressors.


Performance Features
  • EERs up to 10.8 and IPLVs up to 12.0
  • Sizes 020 and 024 utilize three electronically and mechanically independent refrigerant circuits; size 028 utilizes two electronically and mechanically independent refrigerant circuits
  • TXV refrigerant metering device for each circuit
  • Liquid line filter driers
  • Electro-mechanical controls:
    • With return smoke detector
    • With supply and return smoke detector
  • Cooling operation range up to 125° F ambient and down to 40° F ambient
  • Low outdoor sound levels: 8.2 bel (sizes 020, 024), 8.5 bel (size 028)
  • Induced draft combustion system used for reliability and safety
  • Single point gas connection and flue outlet hood
  • Rated in accordance with ARI Standard 360
  • Tested in accordance with UL Standard 1995
  • Listed by UL and UL, Canada
  • 48HJ020 and 024 are ENERGY STAR® listed
Maintenance Features
  • Indoor fan deck slides out for added service convenience
  • Single point electrical service entry. Through the basepan electrical connection available.
Installation Features
  • Fit up to installed Carrier DP, DR, TJ roof curbs
  • Dedicated vertical or side-by-side horizontal airflow units
  • Vertical airflow units are field convertible to side-by-side horizontal airflow with field accessory kit or factory option
Reliability Features
  • Compressor protection includes high and low pressure cutouts and over-temperature protection
  • Crankcase heaters are standard on all models
  • Freeze protection on all circuits
  • Condenser-fan motors are internally protected and have shaft down motor design
  • Cabinet made of pre-painted, galvanized steel with baked enamel finish and fully insulated
  • Reliable IGC (integrated gas unit controller) provides system evaluation and troubleshooting via on-board LED
  • Direct spark ignition with two-stage capacity control
  • Alumagard™ coated Turbo-tubular™ heat exchangers
Standard Limited Warranty
  • Standard one-year product warranty
  • Ten-year warranty on Alumagard coated Turbo-tubular heat exchanger, aluminized and stainless steel
  • Five-year warranty all compressors
Options and Accessories

Factory Installed Option Field Installed Accessory
EconoMi$er IV YY
Power exhaust YY
Barometric relief Yy
Hail guard YY
Horizontal kit YY
Return smoke detector YY
Supply smoke detector Y
Return and supply smoke detector Y
Non-fused disconnect Y
Non-powered convenience outlet Y
Outdoor air enthalpy sensor Y
Return air enthalpy sensor Y
Return air temperature sensor Y
Return air CO2 sensor Y
Indoor Air Quality (CO2) room sensor Y
Pre-coat condenser Y
E-coat condenser Y
Copper condenser Y
Copper evaporator Y
E-coat copper evaporator Y
Low range drive Y
Mid-low range drive Y
Mid-high range drive Y
High range drive Y
Roof curb (14 in.) Y
Roof curb (24 in.) Y
Low heat gas Y
High heat gas Y
Medium heat gas Y
Stainless steel heat exchangers Y
Propane kit Y
Drip edge Y
Two-position damper YY
Condensate overflow switch Y
Phase loss detection Y
Manual damper YY
Thermostat and subbase Y
Hinged access panels Y
ashrae90.1Energy starAHRI standard 340/360 unitary large ac
Sizes
020,024
C-UL-US

Additional Information
Physical data
Documents/DownLoads
 
Controls
RTU-MP Controller
 
 
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