48EY Single-Package Gas Heating/Electric Cooling Rooftop
20 to 45 Nominal Tons
Single-Package Rooftop Units with:
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.
Integrated gas unit controller (IGC):
The IGC contains burner control
logic for accurate and dependable gas ignition. The light emitting
diode (LED) fault notification system reduces service person troubleshooting
time and minimizes service costs. The IGC also maximizes heating
efficiency by controlling evaporator fan on and off delays. The
IGC control board provides built in 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 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.