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GUIDE SPECIFICATIONS — 581A210-300 UNITS (cont)
M. Special Features:
Certain features are not applicable when the features
designated * are specified. For assistance in amending
the specifications, contact your local Bryant Sales Office.
1. Full Perimeter Roof Curbs (Horizontal and Vertical):
a. Formed of 14-gage galvanized steel with wood
nailer strip and shall be capable of supporting
entire unit weight.
b. Permits installing and securing ductwork to curb
prior to mounting unit on the curb.
c. Retrofit roof curb kit shall be available for fit up to
existing Bryant roof curbs.
* 2. Integrated Economizer:
a. Integrated integral modulating type capable
of simultaneous economizer and compressor
operation.
b. Available as a factory-installed option in vertical
supply/return configuration only. (Available as a
field-installed accessory for dedicated horizontal
and/or vertical supply return configurations.)
c. Includes all hardware and controls to provide
cooling with outdoor air.
d. Equipped with low-leakage dampers, not to
exceed 2% leakage at 1 in. wg pressure
differential.
e. Capable of introducing up to 100% outdoor air.
f. EconoMi$er IV shall be equipped with a baromet-
ric relief damper.
g. Designed to close damper(s) during loss-of-
power situations with spring return built into
motor.
h. Dry bulb outdoor-air temperature sensor shall be
provided as standard. Outdoor air sensor set point
is adjustable and shall range from 40 to 100 F.
For the EconoMi$er IV, the return air sensor, indoor
enthalpy sensor, and outdoor enthalpy sensor shall
be provided as field-installed accessories to pro-
vide enthalpy control, differential enthalpy control,
and differential dry bulb temperature control.
i. EconoMi$er IV controller shall use a mixed air
thermistor mounted on the evaporator fan hous-
ing to control EconoMi$er IV operation to a sup-
ply air temperature of 55 F.
j. The EconoMi$er IV shall have a gear-driven par-
allel blade design.
k. EconoMi$er IV controller shall provide control of
internal building pressure through its accessory
power exhaust function. Factory set at 100%, with
a range of 0% to 100%.
l. EconoMi$er IV controller Occupied Minimum
Damper Position Setting maintains the minimum
airflow into the building during occupied period
providing design ventilation rate for full occupancy
(damper position during heating). A remote poten-
tiometer may be used to override the set point.
m. EconoMi$er IV controller Unoccupied Minimum
Damper Position Setting — The EconoMi$er IV
dampers shall be completely closed when the unit
is in the occupied mode.
n. EconoMi$er IV controller IAQ/DCV control modu-
lates the outdoor-air damper to provide ventilation
based on the optional 2 to 10 vdc CO
2
sensor
input.
o. Compressor lockout sensor (opens at 35 F,
closes at 50 F).
p. Actuator shall be direct coupled to economizer
gear, eliminating linkage arms and rods.
q. Control LEDs:
1) When the outdoor air damper is capable of
providing free cooling, the “Free Cool” LED
shall illuminate.
2) The IAQ LED indicates when the module is on
the DCV mode.
3) The EXH LED indicates when the exhaust fan
contact is closed.
r. Remote Minimum Position Control — A field-
installed accessory remote potentiometer allows
the outdoor air damper to be opened or closed
beyond the minimum position in the occupied
mode for modified ventilation.
* 3. Barometric Relief Damper Package:
a. Package shall include damper, seals, hardware,
and hoods to relieve excess internal pressure.
b. Damper shall close due to gravity upon unit
shutdown.
* 4. Power Exhaust:
Package shall include an exhaust (centrifugal style)
fan, 1 Hp 208-230, 460 v (factory-wired for 460 v)
direct-drive motor, and damper for vertical flow units
with economizer to control over-pressurization of
building.
* 5. Thermostats and Subbases:
Units shall provide staged heating and cooling in
addition to automatic (or manual) changeover and
fan control.
6. Hot Gas Bypass Dehumidification Package:
The dehumidification package is a factory-installed
option that provides increased dehumidification by
diverting hot gas from the compressor to the HGRH
coil to provide approximately 75 F leaving air tem-
perature dehumidifying the air but NOT overcooling
the space. The package consists of a single row,
12.25 sq ft subcooling coil located on the leaving air-
side of the evaporator coil. The location of this coil in
the indoor airstream greatly enhances the latent
capacity of the unit.
The package shall be equipped with low pressure
switch(es) and TXVs. Low pressure switch(es) pre-
vents evaporator coil freeze-up and TXVs assure a
positive superheat condition. If the operation of the
Hot Gas Reheat (HGRH) coil is controlled by a field-
installed wall-mounted humidistat, the dehumidifica-
tion circuit will then operate only when needed.
Optional field connections for the humidistat are made
in the low voltage compartment of the unit control box.
7. Humidistat:
Field-installed, wall-mounted humidistat is used to
control activation of the dehumidification package.
The humidistat can be set for humidity levels
between 20% and 80% relative humidity.
* 8. Electronic Programmable Thermostat:
Thermostat shall be capable of using deluxe full-
featured electronic thermostat.
9. Liquefied Propane Conversion Kit:
Kit shall contain all the necessary hardware and
instructions to convert a standard natural gas unit for
use with liquefied propane gas.
10. Convenience Outlet:
Outlet shall be factory-installed and internally
mounted with an externally accessible 115-v, 15 amp
GFI, female receptacle with hinged cover. A step
down transformer shall be included so no additional
wiring is necessary.