Options
Options
A full range of
Cooling Only/Heating Casings
•Cooling Only
•Electric Heat —
•Natural Gas Heat
•Natural Gas Heat - Full Modulation — The heat exchanger drum, tubes and front and rear headers are constructed of the most corrosion resistant austenitic stainless steel alloys available.
•Steam Heat — ARI certified type NS coil with
•Hot Water Heat — ARI certified typeW coil mounted for drainage and provided with hot water modulating valve with actuator. High and low heat options are available.
Power Supplies
Rooftops are available with 200, 230, 460 and 575 voltage power supplies.
Exhaust
•No Exhaust — Rooftops can be built for makeup air applications with no exhaust. Relief opening is sealed watertight.
•Barometric Relief — Gravity dampers are provided that open to relieve positive pressure.
•50 Percent Exhaust Fan — One double inlet
position. Barometric dampers at fan outlet prevent air backdraft.
•100 Percent Modulating Exhaust Fan — Two double inlet
CV rooftops.
•100 Percent Modulating Exhaust with Statitrac™ Control — For both CV and VAV rooftops, the 100 percent modulating exhaust discharge dampers are modulated in response to building pressure. A differential pressure control system, called Statitrac™, uses a differential pressure transducer to compare indoor building pressure to atmospheric pressure.The FC exhaust fan is turned on when required to lower building static pressure to setpoint.The Statitrac control system then modulates the discharge dampers to control the building pressure to within the adjustable, specified dead band that is set at the Human Interface Panel.
Filters
•No Filters (two inch throwaway filter rack only) — complete set of
•No Filters (bag/cartridge with prefilter filter rack) —
•Throwaway
•Cleanable Wire Mesh
•
•
— Glass fiber extended media bag filter is mounted in a galvanized steel frame.
•
Fresh Air
•0To 25 Percent Manual Outside Air — Includes outside air opening with moisture eliminator and manually positioned damper for drawing up to 25 percent outside air.
•Economizer — Includes the primary temperature controls necessary to automatically use outdoor air for free cooling. Option includes modulating return and outside air dampers, high ambient temperature lockout, minimum position control and spring return motor. Standard low leak outside air dampers are provided with a leakage rate of 2.5 percent of nominal airflow at one inchW.C. static pressure. The 0 to 100% fresh air economizer has three optional economizer controls available: comparative enthalpy, reference enthalpy, or dry bulb control.
System Control
•Constant Volume — Provided with all the necessary controls to operate rooftop from a zone sensor, including CV microprocessor unit control module, a microprocessor compressor controller and a unit mounted Human Interface Panel.
•VAV Supply AirTemperature control without inlet guide vanes — Provided with all the necessary controls to operate a VAV rooftop from the discharge air temperature, including discharge air microprocessor controller and discharge air sensor.The microprocessor controller coordinates the economizer control and the stages of cooling with zone or outdoor air reset capabilities and an adjustable control band to
96 |