Specifications

67
GUIDE SPECIFICATIONS (cont)
b. Heating section shall be provided with the follow-
ing minimum protections:
1) High-temperature limit switches.
2) Overcurrent protection.
c. High-pressure switch.
d. Low-pressure switch.
e. Freeze protection thermostat.
I. 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.
J. Electrical Requirements:
All unit power wiring shall enter unit cabinet at a single
factory-predrilled location.
K. Motors:
1. Compressor motors shall be cooled by refrigerant
passing through motor windings and shall have line
break thermal and current overload protection.
2. Indoor blower (evaporator-fan) motor shall have
permanently lubricated bearings and inherent
automatic-reset thermal overload protection.
3. Totally enclosed condenser-fan motor shall have
permanently lubricated bearings and inherent
automatic-reset thermal overload protection.
L. Heating Section:
1. May be equipped with field-installed electric resis-
tance heater(s) of the characteristics shown in the
equipment schedule.
2. Heater elements shall be open wire type, adequately
supported and insulated with ceramic bushings.
M. Special Features:
Certain features are not applicable when the features
designated by * are specified. For assistance in amending
the specifications, contact your local Bryant Sales Office.
1. Roof Curbs:
a. Formed galvanized steel with wood nailer strip
and capable of supporting entire unit weight.
b. Allows for installing and securing 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
exceed 3% leakage, at 1 in. wg pressure differen-
tial (Durablade economizer).
d. Capable of introducing up to 100% outdoor air in
both minimum and fully open positions.
e. Equipped with a gravity relief sliding plate damper
(Durablade economizer). Damper shall close
upon unit shutoff.
f. EconoMi$er shall be equipped with a barometric
relief damper with up to 100% of return air (036-
072) or 90% of return air (090-150) relief. The
Durablade economizer is equipped with 30% of
return-air relief (036-150).
g. Designed to close damper during loss-of-power
situations with emergency power supply (Dura-
blade economizer) or spring return built into
motor (EconoMi$er).
h. Dry bulb outdoor-air thermostat protection shall
be provided as standard.
i. Durablade economizer is a guillotine-style
damper, and the EconoMi$er is a parallel blade
design.
3. 50% Manual Outdoor-Air Damper:
Manual damper package shall consist of damper,
birdscreen, and rainhood which can be preset to
admit up to 50% outdoor air for year-round
ventilation.
* 4. 25% Manual Outdoor-Air Damper:
Manual damper package shall consist of damper,
birdscreen, and rainhood which can be preset to
admit up to 25% outdoor air for year-round
ventilation.
5. 100% Two-Position Damper:
a. Two-position damper package shall include single
blade damper and motor. Admits up to 100% out-
door air.
b. Damper shall close upon indoor (evaporator) fan
shutoff.
c. Designed to close damper during loss of power
situations.
d. Equipped with 15% barometric relief damper.
6. 25% Two-Position Damper:
a. Two-position damper package shall include single
blade damper and motor. Admits up to 25% out-
door air.
b. Damper shall close upon indoor (evaporator) fan
shutoff.
7. Solid-State Enthalpy Control:
Capable of sensing outdoor-air enthalpy content
(temperature and humidity) and controlling econo-
mizer cut-in point to have minimum heat content air
passing over the evaporator coil for most efficient
system operation.
8. Differential Enthalpy Sensor:
a. For use with economizer only.
b. Capable of comparing enthalpy content (tempera-
ture and humidity) of outdoor and indoor air and
controlling economizer cut-in point at the most
economical level.
9. Electric Resistance Heaters and Single Point Kits:
a. Open wire nichrome elements with all necessary
safety operating controls.
b. UL listed and indicated on basic unit informative
plate.
c. Available in multiples to match heating
requirements.
d. Single point kits available for each heater when
required.
10. Low Ambient Control Packages:
Each package consists of condenser-coil tempera-
ture sensor to maintain condensing temperature
between 90 F and 110 F at outdoor ambient temper-
atures down to –20 F by condenser-fan speed modu-
lation or condenser-fan cycling.