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6.3.8 bur – Burner input
This feature is not visible if the Purge is set to zero (i.e. sensor in boiler).
The interval time between purges is fixed to ½ hour. This can be set to be independent of
burner firing (off), or dependant on cumulative boiler firing time (on).
Press the
button to select On for dependant. Press the
button to select OFF, for
independent.
Press the
button to confirm your selection and move to the next menu option.
6.3.9 FLt – FiLTer
This feature is only shown if no purge time is selected, i.e. probe in boiler. Increases the damping
effect on the probe output. If the probe is installed directly in the boiler, select ON. Filter ON
- 64 seconds (default) or OFF, which gives an 8 second delay.
6.3.10 CAL – Calibration
The boiler must be at working temperature when calibrating a system. This is particularly
important if a temperature sensor is not fitted.
To ensure accuracy, the figures entered for both Set Point and Calibration must be greater
than 10% of the chosen range. For the best accuracy, calibrate the controller with the TDS as
close as possible to the Set Point. In some cases the boiler may need to be run for a period
of time to allow the TDS to build up before calibration. Recalibrate the boiler at the Set Point
once the boiler has settled down (after a few days in most cases). Check the calibration (as
close to the Set Point as is practical) weekly to ensure optimum performance.
Allow the previous reading to stabilise before recalibrating the controller.
To calibrate the product:
Press the
button to show the last calibration, then press the
button to increase each digit.
Press the
button to confirm your selection and move to the next menu option.
Note: The unit will take approximately 60 seconds to calibrate, during which time the full
stops between the 'CAL' message will flash.
Calibration - Probe in blowdown line
The correct purge time needs to be selected first to ensure the sensor measures conductivity
at boiler temperature. Once the water conductivity / TDS has been entered, the controller
will open the valve and record the conductivity of the boiler water at the end of the selected
purge time.
Calibration - Probe in a CCD system
We recommend that a competent water treatment company be consulted to establish the
most suitable conductivity level for individual plant. Conditions vary widely, as do the chemical
properties and conductivity of contaminants.
In many cases, the normal measured value of 'clean' condensate will be very low, perhaps
only 1 or 2 µS/cm in some cases, whereas the set point may be much higher, perhaps
30 or 40 µS/cm.
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