50EY Single-Package Rooftop Electric Cooling Units With Optional Electric Heat
20 to 45 Nominal Tons
Single-Package Rooftop Units with:
dedicated horizontal 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
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
reset (VAV [variable air volume]) 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.
The economizer operates in conjunction with mechanical cooling
when required and is factory installed for either vertical or
horizontal operation.
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. The controls are compatible with either a room sensor or conventional thermostat with no need to install an accessory interface.