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

20 to 45 Nominal Tons

Single-Package Rooftop Units with:

 dedicated vertical discharge configurations.

 variable 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

 pre-painted, 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

 VFD (variable frequency drives)

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 reset  intelligent outdoor air mixing for Indoor Air Quality (IAQ)  supply air pressure via Variable Frequency Drive  LED diagnostic capability

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.

Variable frequency drive (VFD) and unit unloading Variable air volume (VAV) units utilize state of the art variable frequency drive (VFD) to control airflow. VAV units have up to 6 steps of unloading for low load operation.

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.

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.