Bryant 581A/B - Manual (Page 141)

141
GUIDE SPECIFICATIONS — 580F036-151 AND 581B036-150 (cont)
b. Heating section shall be provided with the follow-
ing minimum protections:
1) High-temperature limit switches.
2) Induced draft motor speed sensor.
3) Flame rollout switch.
4) Flame proving controls.
J. Operating Characteristics:
1. Unit shall be capable of starting and running at 125 F
ambient outdoor temperature, meeting maximum
load criteria of ARI Standard 210/240 or 360 at
+ 10% voltage.
2. Compressor with standard controls shall be
capable of operation down to 25 F ambient outdoor
temperature.
K. Electrical Requirements:
All unit power wiring shall enter unit cabinet at a single
factory-predrilled location.
L. Motors:
1. Compressor motors shall be cooled by refrigerant
gas passing through motor windings and shall have
line break thermal and current overload protection.
2. Evaporator-fan motor shall have permanently lubri-
cated bearings and inherent automatic-reset thermal
overload protection. Evaporator motors are designed
specifically for Bryant and do not have conventional
horsepower (HP) ratings listed on the motor name-
plate. Motors are designed and qualified in the “air-
over” location downstream of the cooling coil and
carry a maximum continuous bhp rating that is the
maximum application bhp rating for the motor; no
“safety factors” above that rating may be applied.
3. Totally enclosed condenser-fan motor shall have
permanently lubricated bearings, and inherent auto-
matic-reset thermal overload protection.
4. Induced-draft motor shall have permanently lubri-
cated sealed bearings and inherent automatic-reset
thermal overload protection.
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. Roof Curbs (Horizontal and Vertical):
a. Formed galvanized steel with wood nailer strip
and shall be capable of supporting entire unit
weight.
b. Permits installation and securing of ductwork to
curb prior to mounting unit on the curb.
* 2. Integrated Economizers:
a. Integrated integral modulating type capable of
simultaneous economizer and compressor opera-
tion. During economizer operation, up to two
compressors on sizes 090-150 will operate.
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$er IV and EconoMi$er2 shall be
equipped with a barometric relief damper capable
of relieving up to 100% return air.
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$er IV, the return air sen-
sor, indoor enthalpy sensor, and outdoor enthalpy
sensor shall be provided as field-installed acces-
sories to provide enthalpy control, differential
enthalpy control, and differential dry bulb temper-
ature control. For the EconoMi$er2, the enthalpy,
differential temperature (adjustable), and differen-
tial enthalpy control shall be provided as field-
installed accessories.
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$er IV and EconoMi$er2 shall have
a gear-driven parallel blade design.
k. EconoMi$er IV controller shall provide control of
internal building pressure through its accessory
power exhaust function. Factory set at 100%, with
a range of 0% to 100%.
l. EconoMi$er2 shall be capable of control from a
4 to 20 mA signal through optional 4 to 20 mA
design without microprocessor control (required
for PremierLink™ or third party control interface).
m. EconoMi$er IV controller Occupied Minimum
Damper Position Setting maintains the minimum
airflow into the building during occupied period
providing design ventilation rate for full occupancy
(damper position during heating). A remote
potentiometer may be used to override the set
point.
n. EconoMi$er IV controller Unoccupied Minimum
Damper Position Setting — The EconoMi$er IV
dampers shall be closed when the unit is in the
occupied mode.
o. EconoMi$er IV controller IAQ/DCV Maximum
Damper Position Setting — Setting the maximum
position of the damper prevents the introduction
of large amounts of hot or cold air into the space.
This position is intended to satisfy the base mini-
mum ventilation rate.
p. 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.
q. Compressor lockout sensor (opens at 35 F,
closes at 50 F).
r. Actuator shall be direct coupled to economizer
gear, eliminating linkage arms and rods.
s. 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.
58
0F0
3
6
-15
1 AND 58
1B036
-1
50