Bryant 581A/B - Manual (Page 257)

257
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 sen-
sor, indoor enthalpy sensor, and outdoor enthalpy
sensor shall be provided as field-installed acces-
sories to provide enthalpy control, differential
enthalpy control, and differential dry bulb temper-
ature 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 supply
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$er IV controller Occupied Minimum
Damper Position Setting maintains the minimum
airflow into the building during occupied period
providing design ventilation rate for full occupancy
(damper position during heating). A remote
potentiometer may be used to override the set
point.
m. EconoMi$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. Electronic Programmable Thermostat:
Thermostat shall be capable of using deluxe full-
featured electronic thermostat.
7. 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.
8. 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.
9. Non-Fused Disconnect Switch:
Switch shall be factory-installed, internally mounted,
NEC and UL approved. Non-fused switch shall pro-
vide unit power shutoff. Shall be accessible from out-
side the unit and shall provide power off lockout
capability.
10. Hail Guard, Condenser Coil Grille:
Grille shall protect the condenser coil from hail, flying
debris, and damage by large objects without increas-
ing unit clearances.
11. Horizontal Kit:
Horizontal kit shall contain all the necessary hard-
ware to convert a vertical airflow unit to a horizontal
airflow unit.
The unit shall also be available as a horizontal air-
flow unit directly from the factory.
5
81A2
10-
30
0