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Johnson controls P66AAB-1C fan speed control
P66AAB-1 (C) Single Input Sensor PRESSURE ACTIVATED FAN SPEED CONTROL
Start Voltage (% of Supply Voltage)
The P66 Series Electronic Fan Speed Controls are pressure-actuated electronic motor-speed controllers designed primarily to control condenser fan motors on Heating, Ventilating, Air Conditioning, and Refrigeration (HVAC/R) applications (Figure 1). These controls vary the supply voltage to the fan motor in response to the sensed refrigerant pressure, providing direct response to changes in condenser pressure, regardless of the variations in air delivery curves.
P66 controls are available with one or two pressure sensor inputs. In dual sensor models, the control selects the input with the greatest demand.
P66 control models are also available with NEMA 3R (Rainproof) enclosures for outdoor applications (Figure 1). These models come with a plastic enclosure, appropriate gaskets, and low voltage wire leads for 24 VAC power. In addition, the critical high voltage components are encapsulated in a potting compound.
NEMA 1 models cannot be retrofitted in the field to obtain the NEMA 3R (Rainproof) rating.
A P66 and speed controlled motor can replace On/Off fan cycling controls, multiple speed motors, condenser flood-back systems, temperature fan-speed controls, and modulating louver systems.
1. • computer room air conditioning
2. • commercial air conditioning
3. • commercial refrigeration
The P66 Series controls must be applied only to single-phase motors intended for use with a solid-state motor speed control. An applicable motor must be a single-phase, permanent split-capacitor motor and must be:
1. • ball-bearing construction only (Sleeve-bearing motors are not acceptable for use with P66 controls.)
2. • designed to handle non-sinusoidal waveforms generated by solid-state motor speed controls
3. • designed to dissipate the motor heat generated at reduced speed operation
CAUTION: Risk of Property Damage Use only single-phase Permanent Split-Capacitor (PSC) motors approved by the manufacturer for speed control applications with the P66 control. Failure to use a single-phase PSC motor may damage the motor and other property.
WARNING: Risk of Personal Injury Do not install the P66 fan speed control in any application using corrosive or flammable refrigerants. The P66 control is not designed or intended for use with those refrigerants. Use of the P66 control with corrosive or flammable refrigerants may lead to release of refrigerant, which could cause property damage, fire, severe personal injury or death.
