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1.0 INTRODUCTION
The Walchem WCT/WBL100 Series controllers offer a high level of flexibility in controlling cooling tower and boiler
water treatment applications.
One sensor input is available that are compatible with a variety of sensors:
Cooling tower, boiler, and low cell constant condensate contacting conductivity
Electrodeless conductivity
Two digital inputs may be used for a variety of purposes:
State type: Flow switch or other Interlock to stop control, or drum level switch
Water meter contactor: To control a relay to feed a chemical based on flow total
Paddlewheel flowmeter: To control based on flow total or flow rate
Three relay outputs may be set to a variety of control modes:
On/Off set point control
Bleed or Feed based on a Water Contactor or Paddlewheel flow meter input
Feed and Bleed
Feed and Bleed with Lockout
Feed as a percent of Bleed
Feed as a percentage of elapsed time
Daily, Weekly, 2-week or 4-week Biocide timers with pre-bleed and post-add lockout of bleed
Intermittent sampling for boilers with proportional blowdown, controlling on a trapped sample
Time Proportional control
Always on unless interlocked
Dual set point
Probe Wash timer
Diagnostic Alarm triggered by:
High or Low sensor reading
No Flow
Relay output timeout
Sensor error
An optional isolated analog output may be included to retransmit sensor input signals to a chart recorder, data logger,
PLC or other device.
Our unique USB features provide the ability to upgrade the software in the controller to the latest version.
5.3.16 Analog Output, Proportional Control Mode .......................................................................... 42
5.4 Settings Menu .............................................................................................................................. 43
5.4.1 Global Settings ..................................................................................................................... 43
5.4.2 Security Settings .................................................................................................................. 44
5.4.3 Display Settings ................................................................................................................... 44
5.4.4 File Utilities ........................................................................................................................... 44
5.4.5 Controller Details .................................................................................................................. 44
6.0 MAINTENANCE ............................................................................................................................. 46
6.1 Conductivity Sensor Cleaning ........................................................................................................ 46
7.0 TROUBLESHOOTING ................................................................................................................... 47
7.1 Calibration Failure .......................................................................................................................... 47
7.1.1 Contacting Conductivity Sensors ........................................................................................... 47
7.1.2 Electrodeless Conductivity Sensors ...................................................................................... 47
7.2 Alarm Messages ............................................................................................................................. 48
8.0 SERVICE POLICY ......................................................................................................................... 51
9.0 SPARE PARTS IDENTIFICATION ................................................................................................. 52