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

20 to 45 Nominal Tons

Single-Package Rooftop Units with:

 dedicated horizontal 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

 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

Features/Benefits

Design flexibility: Dedicated horizontal units are ideal for replacement or applications such as through-the-wall jobs or jobs where sound must be attenuated before the duct penetrates the roof. Ducts connect directly to the unit. Horizontal units may be curb or slab mounted.

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  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.

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.

Installation/serviceability: Dedicated horizontal 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. The unit is less sensitive to distribution ductwork design. The standard microprocessor controls replace the need for field installed anti-short cycle timers.