Bryant 551A manual GUIDE SPECIFICATIONS - SIZES 036-150 cont, 558F/551B036-150

GUIDE SPECIFICATIONS — SIZES 036-150 (cont)

2.Standard 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 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 differential.

d.Capable of introducing up to 100% outdoor air in both minimum and fully open positions.

e.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.

f.Designed to close damper during loss-of-power situations with spring return built into motor (EconoMi$er).

g.Dry bulb outdoor-air thermostat protection shall be provided as standard.

h.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.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.

8.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.

9. Thermostat and Subbase:

Provides staged cooling and heating automatic (or manual) changeover, fan control, and indicator light.

10. Thru-The-Bottom Service Connectors:

Kit shall provide connectors to permit electrical con- nections to be brought to the unit through the basepan.

*11. Electronic Programmable Thermostat:

Capable of using deluxe full-featured electronic ther- mostat. Shall use built-in compressor cycle delay control for both heating and cooling duty.

12. Condenser Coil Hail Guard Assembly:

Hail guard shall protect against damage from hail and flying debris.

558F/551B036-150

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