48EJ Single-Package Gas Heating/Electric Cooling Rooftop

20 to 45 Nominal Tons

Single-Package Rooftop Units with:

Features/Benefits

Design flexibility: Dedicated vertical supply/return units are ideal for new construction or retrofit to existing installations. The low unit profile is maintained when the unit is installed on the accessory roof curb, which is approved by the National Roofing Contractors Association (NRCA).

Direct Digital Controls (DDC) - standard: Every unit comes equipped with a microprocessor based control system. Standard features include:  heating/cooling operation  remote start/stop  space temperature offset  intelligent outdoor air mixing for Indoor Air Quality (IAQ)  LED diagnostic capability

Integrated gas unit controller (IGC) (gas heating units only):The IGC also contains burner control logic for accurate and dependable gas ignition. The light emitting diode (LED) fault notification system reduces service person troubleshooting time and minimizes service costs. The IGC also maximizes heating efficiency by controlling evaporator fan on and off delays. The IGC control board provides built in diagnostic capability. An LED simplifies troubleshooting by providing visual fault notification and system status confirmation. The IGC also contains exclusive anticycle protection for gas heat operation.

Quality and reliability Dual serviceable, semi-hermetic compressors on intertwined evaporator coil ensures excellent full and part load efficiency. Dual refrigerant circuits, both electrically and mechanically independent, provide standby capability should one circuit require service. Reliable Carlyle 06D/E compressors are proven performers.

Factory installed economizer (standard) All units come equipped with an integrated economizer which permits cooling utilizing an outdoor air sensor. The direct gear driven, low leakage blades eliminate conventional interblade linkages and the associated adjustments. The economizer operates in conjunction with mechanical cooling when required and is factory installed for either vertical or horizontal operation.

Installation/serviceability Dedicated design requires no alteration time to convert in the field. Single point electrical connections are standard on all units. Electrical service access can be made through roof curb or side of unit. High static capability of standard units minimize the need to convert to higher static, oversized motors.