Bryant 580D User Manual download pdf (Page 3)

PROVEN COMPRESSOR RELIABILITY — Design techniques

feature computer programmed balance between compressor,

condenser, and evaporator. Hermetic (036-150 units) and semi-

hermetic (180-300 units) compressors with suction and

discharge service valves are equipped with compressor over-

current and overtemperature protection to ensure dependability.

Crankcase heaters (180-300 units) prevent refrigerant dilution

of oil during off cycles and ensure proper lubrication at start-up

to prolong compressor life. Crankcase heaters are not neces-

sary on 036-150 units due to high-side crankcase design (sizes

072,150) and low refrigerant charge levels (sizes 036-150).

The 579F180 unit (with factory-supplied unloading) is equipped

with a thermostatic expansion valve to precisely adjust refriger-

ant ﬂow during Stage 1 (unloaded) operation. All other 579F/

580D units have the exclusive Acutrol™ metering device which

precisely controls refrigerant ﬂow, preventing slugging and

ﬂood-back, while maintaining optimum unit performance.

Additional unloaders are not recommended on the 579F180-

300 units.

INTEGRATED ECONOMIZERS AND OUTDOOR AIR —

Optional economizers and manual outdoor-air dampers intro-

duce outdoor air which mixes with the conditioned air, improving

indoor air quality and often reducing energy consumption.

During a ﬁrst stage call for cooling, if the outdoor-air tempera-

ture is below the control changeover set point, the discharge-air

sensor modulates the economizer outdoor-air damper open to

achieve the changeover set point. When second-stage cooling

is called for, the compressor is energized in addition to the

economizer. If the outdoor-air temperature is above the change-

over set point, the ﬁrst stage of compression is activated and

the economizer stays at vent position. Economizer operation is

controlled by Accusensor™ I dry-bulb thermostat that senses

outdoor-air temperature. Accessory upgrade kits include Accu-

sensor II solid-state enthalpy control (sizes 036-150) and Accu-

sensor III enthalpy sensor.

The Durablade economizer (option or accessory) on the

580D036-150 units has a reliable sliding plate damper which is

easily adjusted for 100% outdoor air, 100% return air, or any

proportions of mixed air.

The 580D036-150 units can also utilize the optional Parablade

economizer. This economizer incorporates a parallel-opposed

blade design with standard enthalpy controls. In addition, the

Parablade economizer has a spring return built into the damper

motor to provide reliable close-on-power-loss. The Parablade

economizer comes equipped with up to 45% barometric relief

capability for high outdoor airﬂow applications.

For units without economizer, year-round ventilation is en-

hanced by a manual outdoor-air damper (ordered as standard

on 579F180-300; ordered as an accessory or an option

on 580D036-150 units). The damper can be preset to admit

up to 25% outdoor air (sizes 180-300) or 50% outdoor air

(sizes 036-150).

In addition, the barometric relief damper or power exhaust

accessory can be utilized to help maintain proper building

pressure.

INDOOR-AIR QUALITY — Sloped condensate pans minimize

biological growth in rooftop units in accordance with ASHRAE

(American Society of Heating, Refrigeration, and Air Condition-

ing Engineers) Standard 62-89. Two-inch ﬁlters with optional

dirty ﬁlter indicator switch provide for greater particle reduction

in the return air. The face-split evaporator coils improve the de-

humidiﬁcation capability of standard units, and standard en-

thalpy controls provided with the optional or accessory (sizes

036-150) economizers maximize building humidity control.

TABLE OF CONTENTS

Page

Features/Beneﬁts ..........................1-3

Model Number Nomenclature ...................4,5

ARI Capacity Ratings ........................6,7

Physical Data ............................8-13

Options and Accessories .....................14-16

Base Unit Dimensions .......................17-20

Accessory Dimensions ......................21-24

Selection Procedure .........................25

Performance Data .........................26-55

Electrical Data ............................56,57

Typical Piping and Wiring ....................58,59

Typical Wiring Schematics ....................60-62

Controls ................................63,64

Application Data ..........................65,66

Guide Speciﬁcations ........................67-72

1 2 3 4 5 6 7 8 ... 71 72

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Bryant 580D User Manual Page 3

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