22
7.0 TROUBLESHOOTING
Troubleshooting and repair of a malfunctioning controller should only be attempted by qualified
personnel using caution to ensure safety and limit unnecessary further damage. Contact the factory.
7.1
Alarm Messages
HIGH or HIGH-HIGH ALARM
Occurs if the sensor reading rises above the high alarm set points. If the unit is programmed for an alarm relay output, the alarm relay will activate.
The controller will continue to check the sensor reading and any outputs using the sensor will remain active.
Possible Cause
Correction Action
Dirty probe
Clean probe (see Sect. 6.1)
Faulty bleed valve
Repair or replace bleed valve.
Faulty sensor
Replace sensor.
Improper wiring of valve or controller
Correct wiring. See Section 3.4.
Conductivity rose over alarm limit while Timer lockout occurred.
Allow normal bleed to occur.
Faulty bleed relay
Replace relay. (Consult factory.)
Control output has been left in “Hand” mode
Switch back to “Auto”
Bleed relay has been left in “Off” mode.
Switch back to “Auto”
LOW or LOW-LOW ALARM
Occurs if the sensor reading drops below the low alarm set points. If the unit is programmed for an alarm relay output, the alarm relay will activate.
The controller will continue to check the sensor reading and any outputs using the sensor will remain active.
Possible Cause
Corrective Action
Sensor disconnected
Check connections, reconnect as needed.
Sensor dry
Check tee for obstruction. Verify flow. Change location of sensor tee.
Pre-bleed set too low
Check pre-bleed setting compared to % low.
Bleed valve stuck open
Repair or replace Bleed valve. (Consult your Evapco Rep).
Faulty sensor
Replace sensor.
Improper wiring of probe
Correct wiring. See Section 3.4.
Bleed relay has been left in “Hand” mode
Switch back to “Auto”
NO FLOW
Occurs if the flow switch is opened. A message will be displayed. If the unit is programmed for an alarm relay output, the alarm relay will activate.
The conductivity is updated but all interlocked outputs are deactivated.
Possible Cause
Corrective action
No Flow - Normal condition if condenser pumps not operating
Check controller when pumps are operating
Faulty flow switch/cable (if using flow switch)
Check for open circuit. Disconnect flow switch and short the input with
piece of wire.
Insufficient pressure drop through sample stream (if using flow switch)
Check piping. Check for clog in sample line.
Faulty contact on condenser pump starter (if using a secondary contact on
condenser pump to monitor flow).
Disconnect flow switch and short the input with a piece of wire. If “no
flow” message disappears, then contact or cable may be faulty.
Pulse~Pure X1 control contact not closed or RS-485 comm. problem
problem
Consult Pulse~Pure IOM Troubleshooting section
CAUTION: Disconnect power to the controller before opening front panel!
