VIII. CONDENSER FANS AND MOTORS

Condenser fans and motors are factory set. Refer to Condenser-Fan Adjustment section (page 39) as required.

IX. RETURN-AIR FILTERS

Check that correct filters are installed in filter tracks (see Table 1). Do not operate unit without return-air filters.

NOTE: For units with 4-in. filter option, units are shipped with standard 2-in. filters. To install 4-in. filters, the filter spacers must be removed.

X. OUTDOOR-AIR INLET SCREENS

Outdoor-air inlet screens must be in place before operating unit.

XI. GAS HEAT

Verify gas pressures before turning on heat as follows:

1.Turn off field-supplied manual gas stop, located external to unit.

2.Connect pressure gage to supply gas tap, located on field-supplied manual shutoff valve (see Fig. 14).

3.Connect pressure gage to manifold pressure tap.

4.Turn on field-supplied manual gas stop. Provide a call for heating stage 1.

5.After the unit has run for several minutes, verify the supply gas pressure is between 5.5 in. wg and 13.0 in. wg. Provide a call for heating stage 2. Check manifold pressure after 5 minutes of stage 2 opera- tion. Manifold pressure should be 3.00 in. wg. If manifold pressure must be adjusted, refer to Gas Valve Adjustment section.

NOTE: Supply gas pressure must not exceed

13.0 in. wg.

6.Turn off unit.

7.Remove call for heat.

Table 5 — Fan Performance — 581A210 Low Heat Vertical Discharge Units*

AIRFLOW

 

 

 

 

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

 

 

 

 

 

0.2

 

 

0.4

 

 

0.6

 

 

0.8

 

 

1.0

 

(Cfm)

 

 

 

 

 

 

 

 

 

 

 

Rpm

Watts

Bhp

Rpm

Watts

Bhp

Rpm

Watts

Bhp

Rpm

Watts

Bhp

Rpm

Watts

Bhp

3500

460

591

0.68

548

774

0.89

623

951

1.09

692

1126

1.29

755

1301

1.50

4000

499

774

0.89

581

976

1.12

653

1170

1.35

717

1361

1.56

777

1551

1.78

4500

538

990

1.14

617

1212

1.39

685

1423

1.64

746

1630

1.88

803

1835

2.11

5000

579

1243

1.43

654

1485

1.71

719

1715

1.97

778

1938

2.23

832

2158

2.48

5500

621

1536

1.77

693

1798

2.07

755

2045

2.35

811

2285

2.63

864

2520

2.90

6000

664

1871

2.15

732

2152

2.48

792

2417

2.78

846

2673

3.07

897

2925

3.36

6500

707

2250

2.59

772

2550

2.93

830

2834

3.26

883

3106

3.57

932

3373

3.88

7000

751

2676

3.08

813

2994

3.44

869

3295

3.79

920

3585

4.12

967

3868

4.45

7500

795

3150

3.62

855

3487

4.01

909

3805

4.38

958

4112

4.73

1004

4411

5.07

8000

839

3676

4.23

897

4029

4.63

949

4366

5.02

997

4689

5.39

1042

5004

5.75

8500

884

4253

4.89

940

4625

5.32

990

4978

5.73

1037

5318

6.12

1080

5649

6.50

 

 

 

 

 

 

 

 

 

 

AIRFLOW

 

 

 

 

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

 

 

 

 

 

1.2

 

 

1.4

 

 

1.6

 

 

1.8

 

 

2.0

 

(Cfm)

 

 

 

 

 

 

 

 

 

 

 

Rpm

Watts

Bhp

Rpm

Watts

Bhp

Rpm

Watts

Bhp

Rpm

Watts

Bhp

Rpm

Watts

Bhp

3500

814

1476

1.70

871

1650

1.90

924

1825

2.10

975

1999

2.30

1023

2173

2.50

4000

834

1740

2.00

888

1930

2.22

939

2119

2.44

988

2308

2.65

1035

2497

2.87

4500

857

2039

2.35

909

2243

2.58

958

2446

2.81

1005

2650

3.05

1051

2853

3.28

5000

884

2376

2.73

933

2594

2.98

980

2811

3.23

1026

3028

3.48

1070

3244

3.73

5500

913

2753

3.17

960

2984

3.43

1006

3215

3.70

1049

3445

3.96

1092

3674

4.23

6000

945

3172

3.65

990

3417

3.93

1034

3662

4.21

1076

3905

4.49

1117

4147

4.77

6500

978

3636

4.18

1022

3895

4.48

1064

4153

4.78

1104

4409

5.07

1144

4665

5.37

7000

1012

4145

4.77

1055

4419

5.08

1095

4691

5.39

1135

4960

5.70

1173

5229

6.01

7500

1047

4703

5.41

1089

4992

5.74

1128

5277

6.07

1167

5561

6.40

1204

5842

6.72

8000

1084

5311

6.11

1124

5615

6.46

1163

5915

6.80

1200

6211

7.14

1236

6506

7.48

8500

1121

5972

6.87

1160

6290

7.23

1198

6604

7.60

1234

6914

7.95

1269

7223

8.31

LEGEND

Bhp — Brake Horsepower Input to Fan

Watts — Input Watts to Motor

*Motor drive ranges:

Low Range: 647-886 (208/230 and 460-v), 810-1072 (575-v)

High Range: 897-1139 (208/230 and 460-v), 873-1108 (575-v) All other rpms require field-supplied drive.

Refer to page 23 for general Fan Performance Data notes.

NOTE: Maximum continuous bhp is:

Low Range: 4.25 (208/230 and 460-v), 3.45 (575-v)

High Range: 5.75

18

Page 18
Image 18
Bryant 581A VIII. Condenser Fans and Motors, IX. RETURN-AIR Filters, OUTDOOR-AIR Inlet Screens, XI. GAS Heat

581A specifications

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