Bryant LEGACY 580J - Manual (Page 7)

7
FACTORY OPTIONS AND/OR ACCESSORIES (cont.)
The Legacy Line 580J17--28 rooftop coupled with the
Perfect Humidityt system is capable of operating in
normal design cooling mode, subcooling mode, and hot
gas reheat mode. Normal design cooling mode is when the
unit will operate under its normal sequence of operation
by cycling compressors to maintain comfort conditions.
Subcooling mode will operate to satisfy part load type
conditions when the space requires combined sensible and
a higher proportion of latent load control. Hot Gas Reheat
mode will operate when outdoor temperatures diminish
and the need for latent capacity is required for sole
humidity control. Hot Gas Reheat mode will provide
neutral air for maximum dehumidification operation.
Motormaster Head Pressure Controller
The Motormaster motor controller is a low ambient, head
pressure controller kit that is designed to maintain the
unit’s condenser head pressure during periods of low
ambient cooling operation. This device should be used as
an alternative to economizer free cooling not when
economizer usage is either not appropriate or desired. The
Motormaster will either cycle the outdoor--fan motors or
operate them at reduced speed to maintain the unit
operation, depending on the model.
Winter Start Kit
The winter start kit by Bryant extends the low ambient
limit of your rooftop to 25_F (--4_C). The kit bypasses the
low pressure switch, preventing nuisance tripping of the
low pressure switch. Other low ambient precautions may
still be prudent.
Propane Heating
Convert your gas heat rooftop from standard natural gas
operation to Propane using this field--installed kit.
High Altitude Heating
High altitudes have less oxygen, which means heat
exchangers need less fuel. The new gas orifices in this
field--installed kit make the necessary adjustment for high
altitude applications. They restore the optimal fuel to air
mixture and maintain healthy combustion at altitudes
above 2000 ft (610m). Kits may not be required in all
areas.
Optional Stainless Steel Heat Exchanger
The stainless steel heat exchanger option provides the
tubular heat exchanger be made out of a minimum 20
gauge type 409 stainless steel for applications where the
mixed air to the heat exchanger is expected to drop below
45_F (7_C). Stainless steel may be specified on
applications where the presence of airborne contaminants
require its use (applications such as paper mills) or in area
with very high outdoor humidity that may result in severe
condensation in the heat exchanger during cooling
operation.
Flue Discharge Deflector
The flue discharge deflector is a useful accessory when
flue gas recirculation is a concern. By venting the flue
discharge upwards, the deflector minimizes the chance for
a neighboring unit to intake the flue exhaust.
Alternate Motors and Drives
Some applications need larger horsepower motors, some
need more airflow, and some need both. Regardless of the
case, your Bryant expert has a factory installed
combination to meet your application. A wide selection of
motors and pulleys (drives) are available, factory
installed, to handle nearly any application.
Thru--the--Base Connections
Thru--the--base connections, available as a factory option,
are necessary to ensure proper connection and seal when
routing wire and piping through the rooftop’s basepan and
curb. These couplings eliminate roof penetration and
should be considered for gas lines, main power lines, as
well as control power.
Barometric Hood
For Horizontal Economizer applications where relief
damper is installed in duct work. This kit provides the
needed protection.
580J