Carrier 39E/ER User Manual

39E/ER

HEATING & COOLING

Application Data

Fan Motors and Drives for Central Station Air-Handling Units

60 Hertz

INTRODUCTION

The same careful attention given to the selection of the fan should be afforded to the selection of the fan motor and drive. It is the purpose of this publication to define the major factors involved in the selection procedures for these most important components

Factory Installed or Field Supplied? — This

decision is a very basic and important one. Basic, in that it needs to be made early, in the ordering phase of the job.

Important, in that the results of the motor and drive selection directly affect the satisfactory performance and economical operation of the equipment selected.

Limitations — Every fan has limitations relating to

maximum speed and shaft horsepower. Refer to Table 1 for maximum fan horsepower and fan speed limits on standard 39E/ER air handlers.

Fixed or Variable? — Fixed drives are recommended

for all applications. However, variable pitch drives are

often specified because they permit fan speed (thus, sys

tem air volume) to be easily field adjusted. Unfortunately,

this advantage is usually offset by balancing problems

inherent in their design that cause vibration and prema

ture belt wear, especially in the higher horsepower drives.

For this reason, variable pilch drives with motors larger

than 25 hp are not recommended and are not available from the factbrv.

NOTE: In the event that such a field-supplied drive

proves unsatisfactory, contact the drive supplier for any additional technical assistance required

Service Factor — Almost all drives are subject to

occasional overload, consequently it is good engineering practice to have ample capacity designed into the drive to take care of these overloads. Although higher service factors will extend the belt life, they will also increase the

drive loss, resulting in reduced energy efficiency. A

reasonable service factor for fans is considered to be

1.2 to 1.5.

Drive Loss — Proper allowance should be made so the

motor selected does not run overloaded. The major factors in drive efficiency are the load on the belt and the bending radius of the belt around the pulley. Belt tension, operating temperature and drive alignment also con tribute to drive losses. Considering these factors, the drive loss is generally between 2 to 6% of the maximum fan brake horsepower. Using a 3% selection allowance is reasonable.

Fan Motors and Drives

Motor Speed — Generally, 1800-rpm motors are used

on 39E Series air handlers, All factory-supplied standard drives are designed for 1800 rpm, except for some smaller airfoil units that require 3600-rpm motors due to space limitations. Larger motors in certain size units may require an optional (L5) cabinet extension.

Table 2 gives a complete summary of standard motor sizes, limitations, and speeds. Tables 3 dnd 4 give a com plete summary of space and sheave limitations of all fan unit sizes with all NEMA standard motors.

Open Drip Proof (ODP) or Totally Enclosed Fan-Cooled (TEFC) Motors(Fig. 1) — ODP motors

are recommended. Compared to TEFC motors, ODP

motors are less expensive, have a higher service factor

and are normally more readily available from vendor stock.

The 39E/ ER motors are mounted in the unit airstream

and operate with cool air passing over the motor. This

provides additional cooling to windings and motor bear ings and increases the life of the motor, thereby reducing the need for a TEFC motor.

The ODP motors have ventilation openings that allow air over and around the motor windings to keep the temperature as low as possible.

The TEFC motors utilize an internal fan to cool the motor windings. They do not have any openings for venti lation air.

Totally enclosed air over (TEAO) motors rely on strictly unit airflow to cool the motor windings. They do not have an internal fan or openings for ventilation air.

Voltage — The nominal power system voltage will

normally be more than the motor nameplate voltage.

NEMA standards are as follows:

Nominal Power System

Voltage

208 240 480 600

Field-Installed Inverters — High-efficiency motors

are recommended whenever an inverter is field installed to control fan speed. High-efficiency motors can handle the extra heat generated much better than standard motors. The projected life of the motor when controlled by an inverter will be improved if a high-efficiency motor is used.

Motor Nameplate

Voltage

200

230 460 575

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 13 PC201 Catalog No 513-907 PrintedinUSA Form 39E-15XA Pg 1 4-89 Replaces: 39E-12XA Tab 1b

FACTORY-SUPPLIED DTilVES

Factory-Supplied Standard Drives are available

for the motors shown in Table 2, in the rpm range defined by the minimum-maximum values given, subject only to the following qualifieations:

1. Variable speed drives are available with a minimum adjustment of ±7% (i.e., from .93 to 1.07) of any rpm that falls within the range.

2. Fixed speed drives are available within ± 2% (i.e., .98 to 1.02) of any specified rpm within the range.

3. The minimum service factor will be 1.4 on all factorysupplied standard drives. (Based on motor hosepower, not brake horsepower. Actual service factor is nor mally much higher.)

The factory-supplied standard 39E/ER drives have been selected on the basis of performance, availability and eost. They cover all normal requirements, but may not meet every conceivable application. Non-standard applications should be reexamined closely for possible correetion to a standard applieation.

Standard factory drives are most desirable because of cost effectiveness, optimized performance and timely shipment.

Follow the 5-step factory-supplied drive selection pro cedure on page 3 and order by 39E/ ER unit size, fan rpm and type, fixed or variable. Do not use drive package numbers from previous literature. Do included all rele vant motor information — hp, voltage, motor rpm, type and frame size.

Factory-Supplied Special Drives are available on

special order (quote control) and normally will require extended lead time and additional eost. Consult your Carrier representative for additional information.

Table 1 — Motor Hp/Fati Speed Limitations

for Minimum Bearing Life

MAXIMUM

UNIT SIZE

AF — Airfoil FC — Forward Curved NA — Not Available

'Indicates maximum hp and speed that can be used to obtain

200,000 hour average minimum bearing life (B10 life of 40,000 hours)

MOTOR HP*

FC AF

11 15 15 1600 4067

13 15 17 19 20 25 1100 2547 23 25 25 1200 2255 29 25 30 1000 36 30 40 900 1886 39 30 40 48 40 50 770 1611 57 75 90

10 2000 4335 15

20 20 1100 2858

50 75 650 1397

—

100 100

—

MAXIMUM FAN SPEED*

1300 3161

900 1886

—

2079

1412 1334

AF Optional

High-Speed Wheel

4983

NA 3633 3285 2997 2653 2446 2219 2219 1928 1643 1497

FIELD-SUPPLIED DRIVES

Field-Supplied Drives are subject to the physical

limitations and functional constraints of the motor and air handler. See Fig. I and Tables 3-5. Since technical assistance and support after the sale will be required, choose the supplier with care. Deal with an established supplier of known reputation, and share this booklet with him.

STEP

ACTION

Determine fan performance

Check performance iimitations

Check mounting space iimitations

Determine motor mounting designation

Detennine drive type Belt center distance

Determine maximum sheave dimensions

Determine shaft diameters

Field Selection Guide

INFORMATION REFERENCE

Unit size Wheel type (FC/AF) Fan speed (rpm) Fan hp

Maximum rpm Maximum hp

Motor type, hp, rpm and frame size ^

FI or F2'

Variable or fixed Maximum

Minimum Width

Radius Fan

Motor

Fan Performance Catalog, 39E-10P, or the Carrier Electronic Catalog.

Table 1

Tables 3 and 4

Table 6

Page 1

Table 5

Tables 3 and 4

Fig 1

Table 5

Fig 1

FACTORY-SUPPLIED DRIVE SELECTION PROCEDURE

1. Obtain your fan speed and brake horsepower requirements from the fan data in Catalog 39E-10P or from the Carrier Electronic Catalog.

2. Add 3% to the fan brake horsepower to compensate for drive loss.

3. Select motor by horsepower, type, frame size, voltage and motor rpm.

4. Select either fixed or variable pitch drive.

5. Examine the factory available drive speed range on Table 2. If not listed, re-evaluate

your selection for possible correction or request a quote control. All standard applications should be covered in the Table.

Example: Having determined the fan requirements from the 39E-1 PD Catalog Selec

tion Procedure, select a motor and drive.

Given: 39ED23 with FC fan

12,500 cfm

3.67 in. total pressure

1. From the 39E-10P Fan Catalog: 920 rpm

12 bhp

2. Allow for drive loss: 12 bhp x 1.03 = 12.36 bhp

3. Select motor per job specifications: 15 hp, ODP, 254T frame, 460/3/60, 1800 rpm

4. Select a variable drive per job specifications.

5. From Table 2, determine the available speed range for factory-supplied standard

drive is 671 - 1184 rpm. 920 rpm is a valid selection.

Table 2 — Motor Hp Limitations and Fan Speed Ranges for Factory Supplied Standard Drives

39E/ER

SIZE

SEE

LEGEND

C C A

c c

c 10 213T

A C 15 215T

c 10 c 15 c

B,D

MOTOR

2 3 3 5 5 184T 5

75 184T

7.5 213T 1187 1944 10 213T

2 145T 547 3

5 184T 684

7 5 213T 763

10 215T 10 215T

15 15 254T

2 145T 3 5

7 5

15 15

5 75 10

15 20 20 20

5 75 10 15 15 15 20' 20 25

5 75 10 215T 15 20 256T 20 25 25 284T

5 75 10 15 15 15 20 20

25 25 30

75 10 15 20 25 30 40 40

FRAME

SIZE

145T 935 1217 145T 182T 1004 182T

184T

Min Max

— — —

nyb 1825

—■ — —

— —

182T

596

— —

1006

— — — —

254T — — — —

— —

182T 184T 627 213T 215T 215T 215T 254T 254T

182T 184T 213T 215T 254T 256T 256T 256T

182T 184T 213T 215T 254T 254T 254T 256T 256T 256T

182T 184T

213T

254T

256T 284T

184T 213T 215T 254T 254T 254T 256T 256T 284T 284T 286T

184T 213T 215T 404 254T 256T 284T 604 286T 324T 324T

571 605

812 949

— —

— — —

493 499 551 637 782 963

— — —

497 523 561 612 697

— — —

873

— —

—

477 493 531 924 575 658 831 831 1146 992 992

393 414 456 474

—

— —

602

— —

726

—

356 514

377 610

415 835 502

— — — — — —

—

VARIABLE

AF FC

Min Max

2135

1456

— 2St4

—

2407

—

2914 3287

— — —

901 1305

1086 1637 1343 1905 1390

1390

— —

760 1144

902 1280 1572 1287 1265

—

2228

2558

■'-- "■ —

— —

1381 1769

1940

— —

2155 2522

-'■248:r :' —

— — — —

778 1007 1070 1588 1074 1077 1109

—

tS5~

1027 1079 1082 1083

—

1080

— 2097

618 835 778 972

1046

1140 1457

1146

1142 1142

614

7(E9

832

951

—

952

946

— —

701

876 872

—

1025 1355

1831 2337 1989 2452

— —

2297 2297

917 1136 1349 1544

—

1686 1686

—

1880

1161

1352

1641 1641

1842 2120 1842

752 960

1109

— —

1244

— —

1393

— —

1547

—

681 874 354 819 1029

946 1187 1057 1359 1196 1519 1309 1626

—

— —

FIXED

Min

2457 2769

—

3352 3352

3781:

— —

1725 543

2072 592 2513 623

2876 756

2943

—

1486 578

2157

2501

2831

—

1458 480

1745 497

2032 542

2643 2643

1195 1456 1723 545 1968 589

—

2158 2158

—

2288

2413

1063 474 677 824 1257 480 826 1480 516 976 1710 568 1116 1353 1968 2019 2019

2120 980 1193 1038 390 657

1212 1406

1621 1621

1767

1779

—

794 —

893 —

912 —

— —

1113

—

957

_ —

1213

— —

611 626 703 958

_ — —

1137

641 1088 785 996

— — — —

501 774 511

702

___ ___

913 1101

— —

671 834 834 980

410 762 451 474

— — —

599 1015

___ ___

722

__ __

—

369 636 392 741 944 416 896 514 591 914 697

—

— —

Max

1257

—

1539

—

1785

—

1785

—

934

1162 1377 1484

—

1523

___

—

1420

Min

2349

24SS

■ ■2'77-r —

2771

. 3752 3984

_ _

3752 1282

1640

1875

2211

2542

2542' 2798

—

2800 3546

784

945 1339 1871

1297

1275 1924 1313 2192

___

1313

826 1017

1070 1344

1107

1106

1122

1004

1071 1333 1071

1080 1668

___ ___ ___ ___

—

1184 1175 1663 1175 1193

885

1020

—

989

—

547 674

906

918

—

1128 1607

1576 2245

2376

■ 23'77

1570 1809

2011 2547

2256 2256

899

1124

1525

1921

—

2126 2488 '

965

1147 1571

1481

1663 2106 1885 2206 1885 2206

757 1078 960

1111 1464

___

1224 1224

___

1373 1881

___

1525 1655 1938

818 1077

1048 1434 1197 1332 1687 1438 1683 1497 1824 1497

r 2333 [ 3170

■ 3095

■3095

Max

2535

—

351$

4310

1826

2158 2671 3028

3543

2635 2776

3008 3010

1568 1840 2150 2478

2747 2747

1281 1539 1826 2088 2284

2339

1129 1375

1783

2029 2106

1265

___

1743 1743

___

1856

923

1242

1576

1824

Table 2 — Motor Hp Limitations and Fan Speed Ranges for Factory Supplied Standard Drives (cent)

39E/ER

SIZE

SEE MOTOR

LEGEND

39 20

C B 100

c 100 404T

B 100 405T

FRAME

7 5

10 15

25 30 40

10 15 20 25 30 40 50

15 20 25 284T 30 40 324T 50 60 364T

75 15

20 25 30 286T 40 50 326T 60 364T 75

100 404T

15 20 256T 25 284T 30 286T 40 324T 50 60 364T 75 365T

SIZE

213T 215T 254T 256T 284T 286T 324T

215T 254T 404 631 256T 284T 286T 324T 326T

254T 256T

286T

326T

365T 254T

256T

284T

324T

365T

405T

254T

326T

Min

406 464 504 549 584

— — — — — — —

416

436 691

501

— — —

— — — — —

339

371

389

— — — — — — — — — — — — — — — — — — —

— — — — — — — — — — —

— — —

— — — — — — — — — — — — — — —

— —

— — — — — — — — — — — —

— — — — — — —

— — — — — — — — —

Max Min

— —

VARIABLE

Max Min

561 874 693 1078 725 854 805 1334

478

753

—

488 534 597

— — —

— —

1078 1269

—

987 1073 1235 448 1233

— —

—

880

880 1012

919 1198 381

699

777

— — — —

—

584 584 699

— — — — —

—

— — — —

—

1006 425 1240 448 1240 1459 1534 583

___

1135

1419

—

1012 323

805 895 895

— — —

475 539

583

— —

381 410

475 503 516

361 523

408 408 486

— — ___

— —

—

— — —

672 672 805

— —

___ ___ — — —

— — —

FIXED

Max

520 633 1053 1130 763 826 1245 1443 862 1402 1582 862

495 633 711 763 750 1251 1475 750 1340 1609

—

397

593 903 645 1046 1206 645 645 1234 1406

___

—

___

—

Min

916

1053

1492 1685 1574 1785

___

958

1065

1175

1492

841 903

1100

1309 1406

1405

642 753 765 838 806 888 861 955

953 1008 1086 1166 1243 1313 1231 1313

547 678

664 774

683

723

763

854

907 1069

967 1042 1281 1042

Max

1067

1293

___

1109 1248 1406

1733

939 1020 1137

1353

1566

1082. 1174

1248 1313

840

830

915

991

1082

1281

Motors are 3600 rpm, all others are 1800 rpm

LEGEND

A = TEFC only B = TEFC only with cabinet extension option L5 (Requires

Quote Controi on sizes 75/90 )

C = ODP only D = ODP only with cabinet extension option L5

NOTES 1 Ali motors are 60 Hz 2 See Tabie 1 for iimitations based on bearing iife

3. Standard drives do not fit 2-speed motors A Quote Control is

required for a speciai drive when used with 2-speed motors

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