Bryant 580D manual Selection Procedure with 579F180 example

Page 25

SELECTION PROCEDURE (with 579F180 example)

I DETERMINE COOLING AND HEATING REQUIRE- MENTS AT DESIGN CONDITIONS.

Given:

Required Cooling Capacity . . . . . . . . . . . . 170,000 Btuh Sensible Heat Capacity . . . . . . . . . . . . . . . 114,000 Btuh Required Heating Capacity . . . . . . . . . . . . 200,000 Btuh Condenser Entering Air Temp . . . . . . . . . 95 F (Summer) Evaporator Entering Air Temp . . . . . . . . . . . . . 80 F edb,

67 F ewb Evaporator Air Quantity . . . . . . . . . . . . . . . . . . 4,500 cfm External Static Pressure . . . . . . . . . . . . . . . . . 0.6 in. wg Electrical Characteristics (V-Ph-Hz) . . . . . . . . . 460-3-60

Vertical discharge unit with optional economizer required.

edb Ð Entering dry-bulb ewb Ð Entering wet-bulb

IISELECT UNIT BASED ON REQUIRED COOLING CAPACITY.

Enter Cooling Capacities table for 579F180 (page 29) at condenser entering temperature 95 F, evaporator air en- tering at 4,500 cfm and 67 F wb. The 579F180 unit will provide a total cooling capacity of 180,000 Btuh and a sensible heating capacity of 120,000 Btuh. For air entering evaporator at temperatures other than 80 F edb, calculate sensible heat capacity correction as required us- ing the formula in the notes following the Cooling Capaci- ties tables.

NOTE: Unit ratings are gross capacities and do not include the effect of evaporator-fan motor heat. To calculate net capacities, see Step V.

IIISELECT HEATING CAPACITY OF UNIT TO PROVIDE DESIGN CONDITION REQUIREMENTS.

In the Heating Capacities and Ef®ciencies table (page 7) note that the 579F180 300 will provide an output capac- ity of 243,000 Btuh, which is adequate for the given application.

IV DETERMINE FAN SPEED AND POWER REQUIRE- MENTS AT DESIGN CONDITIONS.

Before entering the Fan Performance tables, cal- culate the total static pressure required based on unit com- ponents. From the given and the Accessory/FIOP Static Pressure table on page 52 ®nd:

External static pressure

0.60 in. wg

Economizer static pressure

0.04 in. wg

 

 

Total static pressure

0.64 in. wg

Enter the Fan Performance table 579F180 (page 47) at 4,500 cfm and 0.64 in. wg external static pressure. By in- terpolation, ®nd that the rpm is 988 and the watts are 1334.

VDETERMINE NET COOLING CAPACITY.

Cooling capacities are gross capacities and do not include indoor (evaporator) fan motor (IFM) heat. Use the watts in- put power to the motor calculated in Section IV above.

IFM Watts = 1334

Determine net cooling capacity using the following formula:

Net capacity = Gross capacity ± IFM heat

=180,000 Btuh ± 1334 Watts

(3.412 Btuh )

Watts

=180,000 Btuh ± 4552 Btuh

=175,448 Btuh

Net sensible capacity = 120,000 Btuh ± 4552 Btuh = 115,448 Btuh

The calculations show that a 579F180 unit with the stand- ard motor and standard low-medium static drive is the cor- rect selection for the given conditions.

25

Page 24 Page 26
Image 25
Page 24 Page 26
Contents 580D036-072 579F180,216 580D090-150 579F240,300 FEATURES/BENEFITSPage Table of Contents 580D036-150 Models only Model Number NomenclatureModel Number Nomenclature 579F180-300 Models only ARI* Capacity Ratings Heating Capacities and Efficiencies Ð 580D036-150 ARI* Capacity RatingsHeating Capacities and Efficiencies Ð 579F180-300 Rise EfficiencyUnit Size 580D Physical Data Ð 580D036-072Unit Size 580D Medium LOW/MEDIUM High Heat Physical Data Ð 580D036-072090 102 120 150 Nominal Capacity tons Physical Data Ð 580D090-150Quantity...Diameter Motor Hp...Rpm Pulley Center Line Distance StdUnit Size 580D LOW/MEDIUM High Heat Hihg Heat Medium Heat Physical Data Ð 580D090-150Unit Size 579F Physical Data Ð 579F180-300Unit Size 579F Physical Data Ð 579F180-300LOW/HIGH Heat Option ACCESSORY² Options and AccessoriesHead Pressure Control Head Pressure Control Speed Control 180,216Time Guard II Control Options and AccessoriesDurablade Economizer SizesAccusensor Control Power Exhaust 180-300 Shown Accusensor SensorOnly ThermostatUnit Base Unit Dimensions Ð 580D036-072Unit Corner Weight Dimensions Base Unit Dimensions Ð 580D090-150486 220 636 288 Base Unit Dimensions Ð 579F180,216Dimension Base Unit Dimensions Ð 579F240,300Roof Curb Ð 580D036-072 Accessory DimensionsRoof Curb Ð 580D090-150 Accessory DimensionsPKG. NO. REF Curb Description Height Dimensions degrees and inchesUnit DEG 579FPower Exhaust 579F180-300 Horizontal Supply/Return Adapter Installation 579F180-300Accessory Curb Description Package no Height Pre-Assembled, High StaticII Select Unit Based on Required Cooling Capacity Selection Procedure with 579F180 exampleSHC Performance Data Cooling CapacitiesCooling Capacities Performance Data580D120 10 Tons Performance Data Cooling Capacities580D150 121¤2 Tons 4500/0.08 5250/0.10 6000/0.11 6750/0.12 7500/0.14 Condenser 579F180 15 Tons Temp F Air Entering Evaporator Ð Cfm/BF579F216 18 Tons 5400/0.06 6000/0.07 7200/0.08 9000/0.09579F300 25 Tons 579F240 20 Tons Temp F Air Entering Evaporator Ð Cfm/BF7000/0.03 8750/0.05 10,000/0.07 11,250/0.09 580D036 3 Tons Ð Standard Motor Direct Drive FAN Performance Ð 580D036-150 Vertical Discharge UnitsFiop 580D036 3 Tons Ð Alternate Motor Belt Drive580D048 4 Tons Ð Alternate Motor Belt Drive 580D048 4 Tons Ð Standard Motor Direct Drive580D060 5 Tons Ð Alternate Motor Belt Drive 580D060 5 Tons Ð Standard Motor Direct DriveRpm Bhp Watts 1800 580D072 6 Tons Air¯ow External Static Pressure in. wg2600 1562Rpm Bhp Watts 2250 580D090 71¤2 Tons Air¯ow External Static Pressure in. wg2550 3100Rpm Bhp Watts 2550 580D102 81¤2 Tons Air¯ow External Static Pressure in. wg891 2188 3300 904 2300 3400Rpm Bhp Watts 3000 580D120 10 Tons Air¯ow External Static Pressure in. wg4300 985Rpm Bhp Watts 3750 580D150 121¤2 Tons Air¯ow External Static Pressure in. wg5100 5200FAN Performance Ð 580D036-150 Horizontal Discharge Units Rpm Bhp Watts 1200 569 189 641 1989 1466 2171 Bhp Brake Horsepower Input to Fan299 761 357 859 483 901 546 943 609 1300 604 231 673 352 788 410 887 546 928 615 968 683 1400 640 284 7051392 Medium Speed High Speed 208 230, 460, 575 230,460, 5751365 2038 1426 1331 1986 1400 2227 14611514 15361496 2240 1529 1603894 997 3055 1040 3333 Bhp Brake Horsepower Input to Fan882 895Rpm Bhp Watts 2550 669 627 867 692 1056 754 1062 3676 1102 3860 Bhp Brake Horsepower Input to Fan783 8121008 962973 10191166 Bhp Watts 37501178 1131FAN Performance Ð 579F180-300 Units Performance Data FAN Performance Ð 579F180-300 Units 579F240 20 Tons Air¯ow External Static Pressure in. wg 10,000 Bhp Brake Horsepower Input to FanRpm Bhp Watts 6000 9500579F300 25 Tons Air¯ow 10,500 11,000 11,250 Bhp Brake Horsepower Input to FanRpm Bhp Watts 500 3507Sound Weighted Octave Bands Unit Rating Sound Power Total UnitAIR Quantity Limits Unit Minimum CFM Maximum CFMACCESSORY/FIOP Static PRESSURE* in. wg − 579F180-300 ACCESSORY/FIOP Static PRESSURE* in. wg − 580D090-150Component CFM Unit Motor Pulley Turns OpenBtuh Nominal Altitude COMPENSATION* ÐNominal Input InputAltitude COMPENSATION* Ð 580D090-150 Fan Performance Using Accessory Power Exhaust 579F180-300EVAPORATOR-FAN Motor Efficiency Altitude Derating FACTOR* Ð ALL UnitsMaximum Unit EVAPORATOR-FAN Acceptable EVAPORATOR-FAN Motor PerformanceContinuous Operating AMP Draw BHP 580D036RLA LRA FLA MCA MOCP² Electrical Data Ð 580D036-150Electrical Data Ð 579F180-300 Vertical Discharge Ducting Typical Piping and Wiring Ð 580D036-150Horizontal Discharge Ducting NEC Ð National Electrical Code579F180 shown Typical Piping and Wiring Ð 579F180-300Typical Wiring Schematic Ð 580D036-150 Typical Wiring Schematic 579F240-300, 460-v shown PRI AHAIDM IFCOperating Sequence ControlsCooling, Units With Parablade Economizer 580D036-072 Controls580D036-150 Application DataApplication Data Part 1 Ð General Guide Specifications Ð 580D036-150Guide Specifications Ð 580D036-150 Guide Specifications Ð 580D036-150 Guide Specifications Ð 579F180-300 Guide Specifications Ð 579F180-300 Copyright 1998 Bryant Heating & Cooling Systems
Top Page Image Contents