6
FACTORY OPTIONS AND/OR ACCESSORIES (cont.)
Economizer (dry--bulb or enthalpy)
Economizers save money. The y bring in fresh, outside air
for ventilation; and provide cool, outside air to cool your
building. This is the preferred method of low--ambient
cooling. When coupled to CO
2
sensors, Economizers can
provide even more savings by coupling the ventilation air
to only that amount requi red.
Economizers are available, installed and tested by the
factory, with either ent halpy or dry--bulb temperature
inputs. There are also models for electromechanical as
well as direct digital controllers. Additi onal sensors are
available as accessories to optimize the economizers.
Economizers include gravity controlled, barometric relief
equalizes building pressure and ambient air pressures.
This can be a cast effective solution to prevent building
pressurization.
CO
2
Sensor
Improves productivity and saves money by working with
the economizer to intake only the correct amount of
outside air for ventilation. As occupants fill your building,
the CO
2
sensor detects their presence through increasing
CO
2
leve ls, and opens the economizer appropriately.
When the occupants leave, the CO
2
levels decrease, and
the sensor appropriatel y closes the economizer. This
intelligent control of the ventilation air, called Demand
Control Ventilation (DCV) reduces the overall load on the
rooftop, saving money.
Smoke Detectors
Trust the experts. Smoke detectors make your application
safer and your job easier. Bryant smoke detectors
immediately shut down the rooftop unit when smoke is
detected. They are available, installed by the factory, for
supply air, return air, or both.
Louvered Hail Guards
Sleek, louvered panels protect the condenser coil from
hail damage, foreign objects, and incidental contact.
Convenience Outlet (powered or un--powered)
Lower service bills by including a convenience outlet in
your specification. Bryant will install this service feature
at our fac tory, powered. Provides a convenient, 15 amp,
115V GFCI receptacle.
Non--fused Disconnect
This OSHA--compliant, factory--installed, safety switch
allows a service technician to locally secure power to the
rooftop.
Power E xhaust Pressure R elief
Superior internal building pressure control. This
field--installed accessory may eliminate the need for
costly, external pressure control fans.
RTU--MP, Multi--protocol Controller
Connect the rooftop to an existing BAS wit hout needing
complicated translators or adapter modules using the
RTU--MP controller. This new controller speaks the 4
most common building automation system languages
(Bacne t, Modbus, N2, and Lonworks). Use this controller
when you have an exi sting BAS.
Time Guard II Control Circuit
This accessory protects your compressor by preventing
short--cycling in the event of some other failure, prevents
the compressor from restarting for 30 seconds after
stopping. Not required with RTU--MP or authorized
commercial thermostats.
Filter or Fan Status Switches
Use these differential pressure switches to detect a filter
clog or i ndoor fan motor failure. When used in
conjunction with a compatible unit controller/thermostat,
the switches will activate an a larm to warn the appropriate
personnel.
Motorized 2--Position Damper
The new Bryant 2--posit ion, motorized outdoor air damper
admits up to 100% outside air. Using reliable, gear--driven
technology, the 2--position damper opens to allow
ventilation air and closes when the rooftop stops, stopping
unwanted infiltration.
Manual OA Damper
Manual outdoor air dampers are an economical way to
bring in ventilation air. The dampers are available in 25%
and 50% versions.
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