Table 5 — Evaporator-Fan Motor Data
UNIT
551B
UNIT
PHASE
MAXIMUM
UNIT
VOLTAGE
MAXIMUM
CONTINUOUS
AMP
BHP*
DRAW
036
Single
1.20
208/230
5.4
Three
1.20
208/230
5.4
460
2.4
575
2.4
048
Single
1.20
208/230
5.4
Three
1.20
208/230
5.4
460
2.4
575
2.4
060
Single
1.80
208/230
9.7
Three
1.80
208/230
6.4
460
2.9
575
2.9
072
Three
2.40
208/230
6.4
460
2.9
575
2.9
LEGEND
Bhp — Brake Horsepower
*Extensive motor and electrical testing on these units ensures that the full horsepower range of the
motors can be utilized with confidence. Using your fan motors up to the ratings shown in this table will
not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.
Table 6 — 551B036 Air Delivery — Vertical Discharge Units
AIRFLOW
(Cfm)
BELT-DRIVE MOTOR
External Static Pressure (in. wg)
0.1
0.2
0.3
0.4
0.5
0.6
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
900
581
0.12
673
0.18
736
0.22
805
0.25
865
0.29
911
0.34
1000
644
0.19
709
0.22
782
0.28
835
0.30
900
0.35
937
0.38
1100
687
0.22
746
0.26
806
0.30
867
0.35
929
0.40
964
0.40
1200
733
0.26
785
0.32
843
0.35
903
0.41
960
0.47
994
0.50
1300
754
0.29
826
0.38
891
0.43
942
0.48
991
0.53
1047
0.60
1400
810
0.35
868
0.45
937
0.51
984
0.57
1032
0.62
1067
0.67
1500
841
0.42
911
0.53
985
0.61
1029
0.66
1073
0.72
1109
0.77
AIRFLOW
(Cfm)
BELT-DRIVE MOTOR
External Static Pressure (in. wg)
0.7
0.8
0.9
1.0
1.1
1.2
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
900
957
0.39
988
0.43
1039
0.45
1061
0.47
1083
0.53
1105
0.57
1000
992
0.44
1039
0.49
1061
0.51
1086
0.55
1111
0.59
1136
0.63
1100
1013
0.49
1068
0.55
1090
0.58
1109
0.61
1127
0.64
1145
0.67
1200
1045
0.56
1090
0.64
1109
0.64
1156
0.68
1203
0.71
1250
0.74
1300
1075
0.64
1122
0.70
1152
0.72
1190
0.76
1228
0.80
1266
0.84
1400
1110
0.73
1160
0.84
1181
0.81
1237
0.85
1293
0.89
1349
0.93
1500
1150
0.82
1190
1.00
1225
0.90
1271
0.95
1317
1.00
1363
1.05
LEGEND
Bhp — Brake Horsepower Input to Fan
NOTES:
1. Boldface
indicates
a
field-supplied
drive
is
required.
(See
Note 5.)
2. Maximum continuous bhp is 1.20. Extensive motor and electrical test-
ing on these units ensures that the full range of the motor can be
utilized with confidence. Using your fan motors up to the ratings shown
will not result in nuisance tripping or premature motor failure. Unit
warranty will not be affected.
3. Values include losses for filters, unit casing, and wet coils.
4. Use of a field-supplied motor may affect wire sizing. Contact your
local representative to verify.
5. Motor drive range: 760 to 1090. All other rpms require field-supplied
drive.
6. Interpolation is permissible. Do not extrapolate.
7. Minimum allowable cfm is 300 cfm/ton.
—21—
Summary of Contents for 551B Series
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