Pump hp Phase
Input Power, Volts
208/230 460 575
3/4 3 3.5 1.6 1.3
1.5 3 6.6 3.0 2.4
2 3 7.5 3.4 2.7
3 3 10.6 4.8 3.9
5 3 16.7 7.6 6.1
7.5 3 24.2 11.0 9.0
10 3 30.8 14.0 11.0
15 3 46.2 21.0 17.0
Values based on NEC handbook values for three-phase motors.
For larger pump horsepower, please consult you local sales representative.
Table 6.7 60-Hz Pump FLA Values
6.2 Low Voltage Control Wiring
A control interlock between the drycooler and the indoor cooling units is required. Field-supplied copper wire is required for
connection between like-numbered terminals 70 and 71 on both units for remote On/Off control of the drycooler,
synchronized with the indoor unit. Wiring must be sized and selected for insulation class per NEC and other local codes. See
Table 6.8 below, Table 6.10 on the facing page, Table 6.10 on the facing page, and Table 6.11 on page48 for
recommended wire sizing for control wiring (24 VAC), runs up to 150 ft. (45.7m).
Contact the factory for assistance with longer wiring runs.
Refer to the drawings contained in Table 6.1 on page40 as well as the indoor unit manual for location of terminals on
drycoolers and indoor units. Refer to the electrical schematics supplied with the drycooler and indoor units for proper wiring
of terminals 70 and 71.
Control Wire Run, ft
(m)
Drycooler Types with Pump Controls
DSF DDF DSO DDO
No. of Fans No. of Fans
1 1 1 2 3 4 6 8 1 2 3 4 6 8
0-25 (0-7.6) 16 16 16 16 16 16 16 16 16 16 16 16 16 16
25-50 (7.9-15.2) 16 16 16 16 16 16 16 14 16 14 14 14 14 14
51-75 (15.5-22.8) 16 16 16 16 16 16 14 14 14 14 14 12 12 12
76-100 (23.2-30.4) 16 16 16 16 16 12 12 12 12 12 12 12 12 12
101-125 (30.8-38.1) 16 14 16 16 14 14 12 12 12 10 10 10 10 10
126-150 (38.4-45.7) 16 14 16 14 14 14 10 12 10 10 10 10 10 10
Data is based on 16AWG minimum wire size, 0.4 amp per contactor, 1 to 1.5 volt maximum drop and 104°F (40°C) average ambient temperature.
Table 6.8 Minimium Recommended Control Circuit Wire Size, AWG, 60 Hz Models/Drycooler Types with Pump
Controls
Vertiv | Liebert® Drycooler Installer/User Guide
46
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