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Table 11 — Air Quantity Limits
Table 12 — Evaporator Fan Motor Specifications
BHP —
Brake Horsepower
Table 13 — Accessory/FIOP Economizer Static Pressure (in. wg)
LEGEND NOTES:
1. The factory-assembled horizontal adapter substantially improves fan
performance. See Fig. 27.
2. The static pressure must be added to external static pressure. The
sum and the evaporator entering-air cfm should then be used in con-
junction with the Fan Performance table to determine blower rpm,
bhp, and watts.
Table 14 — Fan RPM at Motor Pulley Setting*
*Approximate fan rpm shown.
†Indicates standard drive package.
**Indicates alternate drive package.
††Due to belt and pulley style, pulley cannot be set to this number of turns open.
UNIT
581A
MINIMUM
CFM
MAXIMUM
CFM
155
3600 6,000
180
4500 7,500
240
6000 10,000
UNIT
581A
NOMINAL
Hp
VOLTAGE
MAX
WATTS
EFF.
MAX
BHP
MAX
BkW
MAX
AMPS
155
(Standard
Motor)
2.9 208 2700 85.8% 3.13 2.34 9.46
2.9 230 2700 85.8% 3.13 2.34 8.6
2.9 460 2700 85.8% 3.13 2.34 4.3
155
(Optional
Motor)
3.7 208 3775 85.8% 4.38 3.27 10.5
3.7 230 3775 85.8% 4.38 3.27 10.5
3.7 460 3775 85.8% 4.38 3.27 4.8
180
5 208 5180 87.5% 6.13 4.57 15.8
5 230 5180 87.5% 6.13 4.57 15.8
5 460 5180 87.5% 6.13 4.57 7.9
240
7.5 208 7915 88.5% 9.47 7.06 22
7.5 230 8640 88.5% 10.33 7.71 22
7.5 460 8640 88.5% 10.33 7.71 13
UNIT
581A
UNIT
VOLTAGE
CFM
ECONOMIZER
PRESSURE DROP
155, 180
All
3,750 .03
4,000 .03
5,000 .05
6,000 .07
7,500 .10
240
All
6,000 .07
7,200 .09
9,000 .11
10,000 .12
bhp —
Brake Horsepower
FIOP —
Factory-Installed Option
581A 0
1
/
2
11
1
/
2
22
1
/
2
33
1
/
2
44
1
/
2
55
1
/
2
6
155†
†† †† †† †† 1064 1035 1006 978 949 920 891 863 834
155**
†† †† †† †† 1426 1393 1360 1327 1294 1261 1227 1194 1161
180†
†† †† †† †† 1021 1002 984 965 947 928 910 891 873
180**
†† †† †† †† 1200 1178 1156 1134 1112 1091 1069 1047 1025
240†
†† †† †† †† 1151 1132 1114 1095 1077 1058 1040 1021 1002
240**
†† †† †† †† 1369 1347 1325 1303 1281 1259 1237 1215 1193