Instruction manual

109
Control direction is set incorrectly. The normal control direction for an open
recirculation loop cooling tower is “Force
Lower”. Go to the Bleed Output Page and
check the setting for the control direction.
Faulty bleed solenoid. Repair or replace the bleed solenoid.
Fuse blown. Replace fuse (F3).
Faulty bleed solenoid wiring. Correct wiring.
Faulty bleed relay. Replace the relay interface board.
Cycles Low Alarm
This error message occurs if you are bleeding based on cycles of concentration and the ratio of
system conductivity to makeup conductivity is below the user-programmed minimum allowable
value.
Possible Causes Corrective Actions
Dirty conductivity electrode. Clean and calibrate the conductivity sensors as
described in Section 7.2 above. If calibration
fails, see troubleshooting for Conductivity
Calibration Failure above.
Faulty conductivity electrode wiring. Correct wiring.
Faulty conductivity electrode. Replace sensor.
Prebleed time set too high, prebleed If the low alarm happens after a biocide
conductivity set too low. addition, go to that Biocide Output Page, and
reduce the prebleed time, or increase the
prebleed conductivity.
Submersion system conductivity Adjust sensor location below the minimum
electrode is dry. water level.
No sample flow, and faulty flow switch. Clean flow switch as described in Section 7.1
above. Verify that the float travels up and
down with the presence and absence of flow.
Solenoid valve stuck open. Repair or replace bleed solenoid valve.