Bryant DuraPac Series Spécifications télécharger pdf (Page 61)

GUIDE SPECIFICATIONS (cont)

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 metering system.

2. Refrigerant filter drier.

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. Refrigerant Controls:

Unit shall contain high-pressure, loss-of-charge (low

pressure) and freeze protection switches.

3. 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 maximum

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 refrigerant

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

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 * are specified. For assistance in amending

the specifications, contact your local Bryant 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

exceed 3% leakage at 1 in. wg pressure differen-

tial (Durablade economizer only).

d. Capable of introducing up to 100% outdoor air.

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. The

Durablade economizer is equipped with 30% of

return-air relief (036-150).

f. Designed to close damper during loss-of-power

situations with emergency power supply (Dura-

blade economizer) or spring return built into actu-

ator (EconoMi$er).

g. Dry bulb outdoor-air temperature sensor shall be

provided as standard. Enthalpy control shall be

provided as an option.

h. Durablade economizer is a guillotine-style

damper, and the EconoMi$er is a gear-driven par-

allel blade design.

i. EconoMi$er shall provide control of internal build-

ing pressure through its accessory two-stage

power exhaust function.

j. EconoMi$er shall be capable of exhausting up to

100% outdoor air.

NOTE:

EconoMi$er is available with field-

installed power exhaust accessory for vertical or

horizontal ductwork applications.

* 3. 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. 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.

* 5. 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.

6. Solid-State Enthalpy Control:

a. For use with Durablade 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.

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Bryant DuraPac Series Spécifications Page 61

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