CyberOne EC CW IOM Manual
16
4.2.7
Condensate Pump
The condensate pump should be inspected semi-annually and cleaned. Ensure that the float works freely. Wipe
the float with a wet cloth and detergent to remove dirt. Clean the tank bottom. Check that the discharge line is
open and water can pass through it freely.
4.3
Troubleshooting
Turn off all power to the unit before conducting any troubleshooting procedures, unless the procedure
specifically requires the system to operate. For troubleshooting purposes the system may be operated with the
doors open by using a pair of channel lock pliers to turn the shaft of the main power disconnect switch to the “On”
position. When the switch is turned on, high voltage will be present inside the cabinet. Exercise caution to prevent
injury. Keep hands, clothing and tools clear of the electrical terminals and rotating components. Ensure that your
footing is stable at all times.
Troubleshooting
Symptom
Probable Cause
Recommendation
Chilled
Water Valve
Fails to Open
or Close
Temperature setpoint too
high or low
Adjust to correct temperature setting.
No control power to the
chilled water valve
Valve actuator is wired incorrectly. Check wiring
schematic and rewire if required.
Actuator failed
Replace actuator.
EC Fan(s)
Fail to Start
Power failure.
Check main power source voltage.
Check power Input cable.
Motor starter protector
(MSP) tripped.
Reset motor starter protector and check
amperage of motor. Compare to setting on the
motor starter protector and adjust the MSP to the
correct FLA if necessary.
Control transformer circuit
breaker tripped.
Check for short circuit or ground fault. If none,
reset circuit breaker.
No Modbus control signal to
fan(s).
Check for a Modbus control signal at each fan.
Refer to the electric drawing to determine the
correct terminals to check.
EC fan’s internal overheat
protection interrupted fan
motor operation.
Determine the cause of the interruption and
correct. Possible causes are:
1.
Blocked rotor.
2.
Low supply voltage > 5 seconds.
3.
Loss of phase > 5 seconds.
After causes 1, 2, and 3 are corrected, the motor
