Walchem - EcoWater CHC Series Service And Troubleshooting Manual

5.6.4 Walchem-

Most of the Walchems used are the WCT300 and WCT400 series controllers. Please refer to
the attached service manual for information regarding the screen layout and specifics about the
controller. Some of the sites may utilize a WebMaster controller. Please refer to the attached
service manual for information regarding the screen layout and specifics about the controller.
Here is some basic information about the controller that will aid in troubleshooting.
 The blow down valve is connected to the bleed function of the controller. Each
controller allows you to manually initiate the valve, refer to manual.
 A LOW ALARM indicates that the current conductivity is too far away from the bleed
set point. If this alarm occurs, verify that the conductivity probe is calibrated, the bleed
set point is within its specifications and that the alarm set point is reasonable. Normally
the alarm set point should be at 30-40% for appropriate indication.
 The blow down valve will only open if the current conductivity exceeds the bleed set
point.
 All conductivity probes except for the toroidal must be verified once a week for
accuracy.
 All models utilize a 5A, 240 Volt fuse on F2 that controls the power to the Bleed Relay.
 The Webmaster unit requires programming via a USB cable to set the configuration of
the Bleed Relay.
 Most Walchem units are wired directly into the 120V relay found in the motor controller
that will remove the control of the blow down actuator away from the Timer. The 120
Volt signal from the NO Bleed relay in the controller passes directly to the coil on the
relay found in the motor controller.
 If the controller is wired directly into the Actuated valve, then the NO signal passes to
the OPEN pin on the actuator and the NC signal passes to the CLOSE pin on the
actuator.
 All Walchem units have a test feature built in to test the meter as well as the probe, refer
to attached manual.
 If the conductivity meter reads "BLEED" even if the current conductivity is blow the set
point and dead bands, then someone may have adjusted the control direction of the bleed
function. Go into the Bleed screens and look under Control Direction it should be set to
HI.
 If someone has placed a password into the controller and the password is not "5850" or
one that the customer has added, you can reset the password on each Walchem product.
Please refer to the operation manual for the controller. The WCT series requires the unit
to turned OFF and then press and hold the UP and DOWN keys while turning it on. The
password will be modified back to "1995" as shown on the screen during the keys being
held in.
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