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2.4 Manual test buttons (in priority order)
Note: When these buttons are released, the product will return to 'PV' or 'end' depending if
pressed in run or commissioning mode.
AL
Alarm button
This button can be used to test the alarm relay and the external circuits. The product will display,
'AL' + 'tSt' (meaning test) + 'PV' (TDS of conductivity) Note: The Alarm only occurs whilst the
key is pressed.
Valve button
This button can open the valve. If a purge time is set, the valve will remain open for the preset
purge time and will update the TDS reading. The product will display 'PV' + 'Pur' (meaning
purge) + 'bLd' (meaning blowdown). The purge interval will be reset. If continuous mode is
selected (purge time = 0) the valve will open for a minute. The product will display 'PV' + 'bld'.
Note: In commission mode, the valve only opens whilst the key is pressed.
Manual clean button
This button can electrically clean the probe for 20 seconds. The product will display PV + CLn
(meaning clean). On completion of the cleaning time, the controller will revert to normal control
after another 20 seconds. This is to allow any bubbles to disperse. Note: In commission mode,
the cleaning only occurs whilst the key is pressed.
Additional information on probe cleaning
If it is found that the calibration has drifted to more than twice its original setting, then the probe
may need cleaning.
15 minutes after the probe has been cleaned, it should then be possible to recalibrate the
controller near to its original level. If not, the probe may not be sufficiently clean, so repeat
the cleaning procedure. In most cases the controller can then be recalibrated. In exceptional
circumstances, where abnormal scaling has been allowed to occur in the boiler, it may still not
be possible to recalibrate the controller. In this case, it is permissible to repeat the cleaning
period in 5-minute steps up to a maximum of 30 minutes, checking the calibration after each
step. Wait for 15 minutes after each cycle to allow the system to stabilize.
Important note: The use of the probe cleaning function must not be regarded as a substitute
for adequate water treatment. If scale is forming on the probe tip it is a certain warning that
scale will also be forming on the boiler tubes. Boiler water treatment must be investigated.
Over-use of the probe cleaning function may shorten the life of the probe.
2.5 View parameter mode
Press the
button in run mode to view and step through the parameters selected. Each
parameter will remain on view for a further 2 minutes unless the button is pressed again.
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