50EJ Single-Package Rooftop Electric Cooling Units With Optional Electric Heat

20 to 45 Nominal Tons

Single-Package Rooftop Units with:

 dedicated vertical discharge configurations.

 constant volume controls

 efficiencies from 8.5 to 10.4

 meets ASHRAE Standard 62

 standard cooling operation at outdoor ambient temperatures as low as 35 F

 aluminized steel, sloped condensate pan

 all internal surfaces are sheet metal lined or antimicrobial insulation

 two-inch return air filters

 single power entry to unit

 Commercial duty, totally enclosed, 3-phase condenser motors with permanently lubricated bearings

 prepainted, galvanized steel cabinet

 commercial strength base rails (full perimeter, 14 gage)

 communicating DDC (Direct Digital Controls) unit controllers

 semi-hermetic compressors with service valves as standard

 dual independent refrigerant circuits with intertwined evaporator coils

 hinged access panels

 short cycle protection

 service diagnostics

 integrated economizer utilizing direct-drive actuators and opposed blade dampers

 IAQ options

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). The roof curb is made watertight by the roofer. The ducts are attached directly to the roof curb to allow all ductwork to be completed before the unit is positioned.

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

The Direct Digital Controls are ''cable ready'' to plug into the Carrier Comfort Network (CCN). The CCN is a fully communicating HVAC network which allows the user to fine tune equipment performance, manage energy use, and minimize operating costs.

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.