Bryant 580D - Manual (Page 71)

GUIDE SPECIFICATIONS — 579F180-300
H. Filter Section:
Standard filter section shall consist of 2 sizes of factory-
installed 2-in. thick throwaway fiberglass filters of
commercially available sizes.
I. Controls and Safeties:
1. Unit Controls:
a. Economizer control (optional)
b. Capacity control (2-step)
c. Unit shall be complete with self-contained low-
voltage control circuit.
2. Safeties:
a. Unit shall incorporate a solid-state compressor
lockout which provides reset capability at the
space thermostat, should any of the following
safety devices trip and shut off compressor:
1) Compressor overtemperature, overcurrent.
2) Low-pressure switch.
3) Freezestats (evaporator coil).
4) High-pressure switch.
b. Supply-air thermostat shall be located in the unit.
c. Heating section shall be provided with the follow-
ing minimum protections:
1) High-temperature limit switch.
2) Induced-draft motor speed sensor.
3) Flame rollout switch.
4) Flame proving controls.
5) Redundant gas valve.
J. Operating Characteristics:
1. Unit shall be capable of starting and running at 115 F
ambient outdoor temperature per maximum load crite-
ria of ARI Standard 360.
2. Unit with standard controls will operate in cooling
down to an outdoor ambient temperature of 40 F on
579F180 units, to 35 F on 216 units, to 25 F ambient
on 240 units, and to 48 F ambient on 300 units.
3. Unit shall be provided with fan time delay to prevent
cold air delivery.
K. Electrical Requirements:
All unit power wiring shall enter unit cabinet at a single
location.
L. Motors:
1. All compressor motors shall be of the refrigerant
cooled type with thermal and calibrated circuit breaker
overload protection.
2. All fan motors shall have permanently lubricated,
sealed bearings and inherent automatic-reset thermal
overload protection or manual reset calibrated circuit
breakers.
3. All indoor-fan motors 5 hp and larger shall meet the
minimum efficiency requirements as established by
the Energy Policy Act of 1992 (EPACT) effective Oc-
tober 24, 1997.
M. Special Features:
Certain features are not applicable when the features
designated * are specified. For assistance in amending
the specifications, contact your local sales office.
1. Roof Curbs (Horizontal and Vertical):
a. Formed of 18-gage galvanized steel with wood
nailer strip and shall be capable of supporting en-
tire unit weight.
b. Permits installing and securing ductwork to curb
prior to mounting unit on the curb.
2. Horizontal Adapter Roof Curb:
Includes factory-assembled adapter and duct
and substantially improves evaporator fan static
performance.
* 3. Integrated Economizer:
a. Integrated type capable of simultaneous econo-
mizer and compressor operation to provide cool-
ing with outdoor air.
b. Equipped with low-leakage dampers not to
exceed 3% leakage, at 1.0 in. wg pressure
differential.
c. Capable of introducing up to 100% outdoor air.
d. Equipped with dry-bulb temperature control to
govern economizer changeover.
e. Equipped with a mixed-air sensor that controls the
economizer to a 55 F control point.
4. Two-Position Damper:
Two-position damper package shall include single
blade damper and motor. Admits up to 25% outdoor
air, and shall close upon unit shutoff.
5. Accessory Compressor Cycle Delay:
Compressor shall be prevented from restarting for a
minimum of 5 minutes after shutdown.
* 6. Thermostats and Subbases:
To provide staged heating and cooling in addition to
automatic (or manual) changeover and fan control.
* 7. 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 shut-
down.
* 8. Power Exhaust:
Package shall include an exhaust (propeller style)
fan,
1 ⁄
2
Hp 208-230, 460 v (factory-wired for 460 v)
motor, and damper for vertical flow units with econo-
mizer to control overpressurization of building.
* 9. Head Pressure Control Package:
Consists of an accessory outdoor-air package and a
solid-state control with condenser coil temperature
sensor
for controlling condenser-fan motor
speed to maintain condensing temperature between
90 F and 100 F at outdoor ambient temperature
down to –20 F.
10. Low-Ambient Kits:
When used, allows units to operate at lower outdoor
ambient temperatures. See trade prices for more
information.
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