Bryant 580D - Manual (Page 68)

GUIDE SPECIFICATIONS — 580D036-150 (cont)
5. The integrated gas controller (IGC) board shall include
gas heat operation fault notification using an LED
(light-emitting diode).
6. Unit shall be equipped with anti-cycle protection with
one short cycle on unit flame rollout switch or 4 con-
tinuous short cycles on the high-temperature limit
switch. Fault indication shall be made using an LED.
7. The IGC board shall contain algorithms that modify
evaporator-fan operation to prevent future cycling on
high-temperature limit switch.
8. The LED shall be visible without removal of control
box access panel.
G. Refrigerant Components:
Refrigerant circuit components shall include:
1. Fixed orifice feed system.
2. Refrigerant strainer.
3. Service gage connections on suction, discharge, and
liquid lines.
H. Filter Section:
1. Standard filter section shall consist of factory-
installed, low velocity, throwaway 2-in. thick fiberglass
filters of commercially available sizes.
2. Filter face velocity shall not exceed 320 fpm at nomi-
nal airflows.
3. Filter section should use only one size filter.
4. Filters shall be accessible through an access panel
with ‘‘no-tool’’ removal.
I. Controls and Safeties:
1. Unit Controls:
Unit shall be complete with self-contained low-voltage
control circuit protected by an auto-reset device.
2. Safeties:
a. Unit shall incorporate compressor overtempera-
ture and overcurrent safety devices to shut off
compressor.
b. 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.
J. Operating Characteristics:
1. Unit shall be capable of starting and running at
115 F ambient outdoor temperature, meeting maxi-
mum load criteria of ARI Standard 210/240 or 360.
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 refrig-
erant 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.
3. Totally enclosed condenser-fan motor shall have per-
manently lubricated bearings, and inherent automatic-
reset thermal overload protection.
4. Induced-draft motor shall have permanently lubricated
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 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
operation.
b. Includes all hardware and controls to provide
cooling with outdoor air.
c. Equipped with low-leakage dampers, not to ex-
ceed 3% leakage at 1 in. wg pressure differential
(variable sliding plate economizer only) or parallel
blade design.
d. Capable of introducing up to 100% outdoor
air.
e. Parallel opposed blade economizer shall be
equipped with a barometric relief damper with up
to 30% of return air (036-072) or 45% of return air
(090-150) relief. The variable sliding plate econo-
mizer is equipped with 30% of return-air relief
(036-150).
f. Designed to close damper during loss-of-power
situations with emergency power supply (variable
sliding plate economizer) or spring return built into
motor (parallel opposed blade economizer).
g. Dry bulb outdoor-air thermostat (variable sliding
plate economizer) or enthalpy (parallel opposed
blade economizer) protection shall be provided as
standard.
h. Variable sliding plate economizer is a guillotine-
style damper, and the parallel opposed blade
economizer is a parallel blade design.
i. Parallel opposed blade economizer shall provide
control of internal building pressure through its in-
herent power exhaust function.
j. Parallel opposed blade economizer shall be ca-
pable of exhausting up to 100% outdoor air.
NOTE: Parallel opposed blade type economizer
shall also be available with power exhaust.
* 3. Manual Outdoor-Air Damper:
Manual damper package shall consist of damper,
birdscreen, and rainhood which can be preset to ad-
mit up to 50% outdoor air for year round ventilation.
* 4. 100% Two-Position Damper:
a. Two-position damper package shall include single
blade damper and motor. Admits up to 100% out-
door air.
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