Preliminary—This information may change.
6 P66 Series Electronic Fan Speed Controls Installation Instructions
97%
90%
10% to 40%
of Line
(model specific)
No fan operation
in this
pressure range.
0
psig
Operating Range
(190/250 psig)
Operating Range
Plus 20 or 30 psi*
*20 psi for 30 psi Effective Throttling Range (ETR)
30 psi for 60 psi Effective Throttling Range (ETR)
350 psig
Motor Voltage
Pressure Input
P
66_
OP_
CHAR
T
Figure 6: Operation Chart for the P66 Fan Speed Control
Table 1: P66 Control Operation
Pressure Input Motor Voltage (VAC, true RMS)
Pressure is between 0 psig and the low end of the
0 to 5 volts
Pressure is at the low end of the operating range.
Start voltage (10% to 40% of line - model specific)
Pressure is in the operating range.
Motor voltage varies directly with system pressure from start
voltage to 90% of line voltage.
Pressure is above the operating range.
A further pressure increase of 20 to 30 psi will increase
motor voltage to 97% of the applied voltage.
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Pressure Ratings
