Troubleshooting; Pressure Transducer Troubleshooting; Repairs And Replacement - Penn P66AAB-1 Installation Instructions Manual

Troubleshooting

Refer to the Operation section for proper operation.
Table 2: Troubleshooting Chart
Problem
No Fan Operation
Fan stops when pressure reaches
the high end of the operating range.
No Fan Modulation (On-Off
Operation)
Fan Starts at Full Speed.
Erratic Fan Operation
Fan motor is cycling thermal
overload.

Pressure Transducer Troubleshooting

1. Disconnect 6-pin connector from right side of
control.
2. Place a jumper wire between third pin from the
top and the bottom pin on the control, not the
cable.
a. If fan goes to full speed, check for input
pressure.
b. If there is adequate pressure, the transducer
is bad and the control must be replaced.
Possible Cause
Input pressure is below operating
range.
No 24 volt control voltage
No input pressure to control
Bad fan motor
Pressure transducer problem
Control is not wired correctly.
Control is not wired correctly.
Pressure transducer problem
Control is not wired correctly.
Pressure transducer problem
Control is not wired correctly.
Dirty or blocked condenser coil
Pressure transducer problem
Dirty or blocked condenser coil
Wrong motor for fan speed control
application

Repairs and Replacement

Field repairs must not be made. For a replacement
control, contact the Original Equipment Manufacturer
or your local Johnson Controls/PENN distributor.
P66 Series Electronic Fan Speed Controls Installation Instructions
Possible Solution
No problem, normal operation.
Check for 24 VAC at control.
Alignment. Schrader valve depressor
must depress Schrader valve enough to
allow pressure into capillary.
Disconnect power. Place a jumper from L
to M and connect power. If fan does not
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start, motor is bad and should be
replaced.
See Pressure Transducer
Troubleshooting section.
See wiring diagrams. Ensure that the
24 VAC power supply is connected
in-phase with the motor power supply.
See wiring diagrams. Ensure that the
24 VAC power supply is connected
in-phase with the motor power supply.
See Pressure Transducer
Troubleshooting.
See wiring diagrams. Ensure that the
24 VAC power supply is connected
in-phase with the motor power supply.
See Pressure Transducer
Troubleshooting.
Check to see if control voltage (24 VAC) is
on same phase as motor.
Clean condenser coil.
See Pressure Transducer
Troubleshooting.
Clean condenser coil.
Replace with motor approved for fan
speed control application.
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