AIR-COOLED FLUID COOLER
33 • Air-Cooled Condenser Manual
• If the motor does not operate there probably is a defect internal to the motor (the
module needs to be replaced).
• If the unit operates normally in these tests, then the likely cause for the motor not
operating is in the control scheme and should be further investigated.
7.6.8 General Note on Control Wiring
• Confirm that the insulation or any crimped tips are not preventing electrical contact
to the motor.
• Confirm that the control wiring is wired properly according to the condenser’s wiring
diagram.
• Confirm the control signal is present at the motor. Measure the signal at the motor
pin or by applying the signal to a motor that is known to operate correctly. If an
analog signal is being sent to the motor, using a multimeter, confirm the proper
voltage is present at the input of the motor by measuring at the spring contact on
the motor at the terminal block.
• Confirm that the PWM or 4-20mA signal is correct using the appropriate measuring
instrument. If the motor still does not operate, remove and replaced.
Typically, problems can be found and corrected by following the listed guidelines. If the
module will still not operate, it should be replaced.
7.7 Preventive Maintenance
The operating life of the fluid cooler can be extended by following a simple preventive
maintenance schedule. This schedule will reduce the possibility of failure of components and
unnecessary malfunction of the system. Although the service technicians must be thoroughly
familiar with the special design features of this equipment before attempting any service or
repair, an experienced technician can perform certain simple maintenance functions to ensure
normal, trouble-free operation.
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