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.