Product Overview

P66 Series Electronic Fan Speed Controls Product Bulletin 3
Table 2: P66 Control Operation
Pressure Input Motor Voltage
Pressure is between 0 psig and the low end of the
operating range.
0 to 5 volts
Pressure is at the low end of the operating range. Start voltage: 10% to 40% of line - Model Specific (See
Table 3.)
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 increases motor
voltage to 97% of the applied voltage.
Figure 2: Operation Chart for the P66 Fan Speed Control
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
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Pressure Input