Bryant 581B manual Guide Specifications

GUIDE SPECIFICATIONS (cont)

I. Controls and Safeties:

1. Unit Controls:

Unit shall be complete with self-contained low- voltage control circuit protected by a fuse on the 24-v transformer side.

2.Safeties:

a.Unit shall incorporate a solid-state compressor protector which provides anti-cycle reset capabil- ity at the space thermostat, should any of the following standard safety devices trip and shut off compressor.

1)Compressor overtemperature, overcurrent.

2)Loss-of-charge/low-pressure switch.

3)Freeze-protection thermostat, evaporator coil.

4)High-pressure switch.

The lockout protection shall be easily discon- nected at the control board, if necessary.

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:

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:

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 passing through motor windings and shall have line break thermal and current overload protection.

2.Indoor blower (evaporator-fan) motor shall have per- manently 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.

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 by * are specified. For assistance in amending the specifications, contact your local 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.

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:

a.For use with variable sliding economizer package only.

b.Capable of sensing outdoor-air enthalpy content (temperature and humidity) and controlling econ- omizer cut-in point to have minimum heat content air passing over the evaporator coil for most effi- cient 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.Outdoor-Air Enthalpy Sensor:

The outdoor-air enthalpy sensor shall be used with the EconoMi$er device to provide single enthalpy control. When used in conjunction with a return-air enthalpy sensor, the EconoMi$er device will provide differential enthalpy control. The sensor allows the EconoMi$er controller to determine if outside air is suitable for free cooling.

10. Return-Air Enthalpy Sensor:

The return-air enthalpy sensor shall be used with the EconoMi$er device. When used in conjunction with an outdoor-air enthalpy sensor, the EconoMi$er device will provide differential enthalpy control.

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