48EJ Single-Package Gas Heating/Electric Cooling Rooftop
20 to 45 Nominal Tons
Single-Package Rooftop Units with:
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
offset intelligent outdoor air mixing for Indoor Air Quality
(IAQ) LED diagnostic capability
Integrated gas unit controller (IGC)
(gas heating units only):The
IGC also 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. An LED simplifies troubleshooting
by providing visual fault notification and system status confirmation.
The IGC also contains exclusive anticycle protection for gas heat
operation.
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 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.