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Table 18 — 558D072 Air Delivery — Horizontal Discharge Units (Standard Motor)
AIRFLOW
(Cfm)
0.1
Rpm
Watts
Rpm
1800
765
487
821
1900
802
539
854
2000
840
600
888
2100
878
669
923
2200
916
739
958
2300
954
827
993
2400
993
916
1029
2500
1031
1022
1066
2600
1070
1131
1103
2700
1109
1258
1140
2800
1148
1396
1177
2900
1188
1543
1215
3000
1227
1700
1253
NOTES:
1. Boldface indicates field-supplied drive required. (See Note 7.)
2.
indicates field-supplied motor and drive are required.
3.
indicates maximum usable watts of a factory-supplied motor.
4. Maximum usable watts input is 2120. Extensive motor and electrical testing on these units ensures that the full range of the motor can be
utilized with confidence. Using your fan motors up to the wattage ratings shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected. For additional information on motor performance, refer to Table 4.
5. Values include losses for filters, unit casing, and wet coils.
6. Use of a field-supplied motor may affect wire sizing. Contact your distributor to verify.
7. Standard motor drive range: 1070 to 1460. All other rpms require field-supplied drive.
8. To convert watts to bhp:
watts input x motor efficiency
bhp =
746
Motor efficiency = .84
B. Belt Drive Motors
Fan motor pulleys are factory set for speed shown in Table 1.
To change fan speed:
1. Shut off unit power supply.
2. Loosen belt by loosening fan motor mounting nuts. See
Fig. 34.
3. Loosen movable pulley flange setscrew (see Fig. 35).
4. Screw movable flange toward fixed flange to increase speed
and away from fixed flange to decrease speed. Increas-
ing fan speed increases load on motor. Do not exceed maxi-
mum speed specified in Table 1.
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew. (See Table 1 for speed change for each
full turn of pulley flange.)
To align fan and motor pulleys:
1. Loosen fan pulley setscrews.
2. Slide fan pulley along fan shaft.
3. Make angular alignment by loosening motor from
mounting.
To adjust belt tension:
1. Loosen fan motor nuts.
2. Slide motor mounting plate away from fan scroll for proper
belt tension (
1
⁄
-in. deflection with one finger).
2
3. Tighten motor mounting nuts.
4. Adjust lock bolt and nut on mounting plate to secure
motor in fixed position.
C. Ventilation Sequence
If unit is equipped with economizer, the damper will open to
the minimum position whenever the evaporator fan runs.
0.2
0.4
0.6
Watts
Rpm
Watts
Rpm
532
923
638
1019
585
953
700
1046
646
984
771
1073
716
1015
843
1101
795
1046
924
1129
883
1079
1022
1160
973
1112
1123
1190
1081
1145
1241
1220
1199
1179
1353
1251
1318
1212
1482
1283
1465
1246
1621
1316
1604
1281
1770
1349
1770
1316
1936
1382
STANDARD BELT DRIVE MOTOR
External Static Pressure (in. wg)
0.8
1.0
Watts
Rpm
Watts
Rpm
843
1099
883
1178
835
1126
965
1201
907
1154
1047
1226
981
1182
1140
1252
1072
1209
1241
1280
1173
1237
1344
1309
1275
1264
1447
1336
1396
1292
1569
1363
1517
1322
1700
1390
1656
1352
1849
1418
1805
1383
1997
1446
1962
1413
2154
1476
2136
1444
2317
1506
Fig. 34 — Belt-Drive Motor Mounting
Fig. 35 — Evaporator-Fan Pulley Adjustment
—27—
1.2
1.4
Watts
Rpm
Watts
Rpm
Watts
1031
1249
1182
1316
1353
1106
1274
1275
1338
1439
1990
1297
1361
1363
1534
1292
1320
1456
1388
1639
1404
1345
1569
1410
1744
1517
1372
1691
1434
1866
1639
1400
1823
1459
1997
1770
1428
1962
1486
2145
1901
1456
2102
1514
2300
2041
1483
2257
1543
2462
2188
1510
2403
—
2352
1537
2562
—
2529
—
—
—
MOTOR MOUNTING
NUTS AND BOLTS
1.6
Rpm
Watts
1382
1526
1402
1621
1424
1718
1448
1831
1473
1945
1496
2067
1519
2188
1543
2335
1569
2487
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