Hydrotech UVSS Series Ultraviolet Water Purification System User Manual

Page 9

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1. UV Intensity (%) - UVSS-M Models Only:

The UVSS-M models incorporate a UV sensor which detects the discrete 254 nm wavelengths of the UV lamp. This
information is relayed to the controller and is the default display shown in “% UV output”. The system will display the UV
output between 50 to 99 percent. When the system drops below 50%, a low UV warning is displayed as [ A2 ] and alter-
nately flashes (at 2 second intervals) back to the actual UV level.
Example: [ 49 ] Additionally, the system will supply an intermittent audible tone (2 seconds on, 2 seconds off), during low
UV conditions.

NOTE: UV levels of:

[ 65 ] to [ 99 ] Indicates the system is functioning within a normal operating range.

[ 56 ] to [ 64 ] Indicates the UV level is still within a safe level, however cleaning or lamp replacement may soon

be required.

[ 50 ] to [ 55 ] Indicated the UV level is nearing the point of unsafe UV intensity, UV system should be immediate-

ly serviced.

< [ 49 ] Indicates the UV level has now reached a level that is unsafe. At this level the water should not be

consumed. The system/water supply should be examined to determine the reason for the low UV
level of the UV intensity. At this level, the solenoid output has been activated and if a solenoid is
installed, water will cease to flow.

DEFERRAL - To temporarily defer the audible alarm during a low UV alarm, press the push-button “RESET” switch and
hold for five seconds. This will mute the audible alarm condition for 12 hours.


This advanced warning system has been installed to provide you with the optimum protection against microbiological
contamination of you water.
The best way to ensure optimum UV performance is to have the water microbiologically tested by a recognized testing
agency on a regular basis.

Possible causes for low UV alarm conditions:

a) The UV lamp has perhaps reached a level whereby it can no longer adequately provide a sufficient level of disinfec-

tion due to age (> 9000 hours). The lamp should be replaced with a new lamp from the manufacturer of the same size
and type.

b) The quartz sleeve and/or the sensor window have become stained or dirty. Mineral deposits or sediment in the water

that was not detected during the original water analysis may be the cause for this (refer to page 5-6 for cleaning

c) Intermittent voltage drop in the household power supply reducing the lamp output. The lamp will return to normal when

the power is restored to full voltage.

Note: the monitoring system will not operate during power failures.

d) The quality of the influent water has changed and is no longer within the acceptable operational range of the UV sys-

tem. Perform a water analysis to determine the exact constituents and concentration levels.

e) The UV sensor is not installed correctly (see page 6).


Electronic Control Box Operation – UVSS-M Models