Davey UV70 Steriflo UV, Ultra Violet Water Treatment Systems - Manual (Page 9)

9
Maintenance continued...
Reverse procedure when replacing sleeve.
When replacing the quartz sleeve after cleaning the sleeve end should protrude
around 4 to 5 mm evenly above the threaded nipple before replacing the o-ring.
More or less than this indicates the sleeve may not be properly located and serious
damage could result when the end-cap is fitted and/or the system is re-
pressurised.
Place o-ring over sleeve and fit end cap with white pressure ring inside it, fastening
it hand tight only.
A tiny amount of silicon spray or CRC in the end of aluminium endcap threads will
aid easy tightening. Do not use excessive force when tightening nuts. Do not re-
use quartz sleeve or o-ring if damaged.
Water Quality
Where the water being pumped contains unusually high levels of dissolved solids
particularly hard water, iron, manganese or biological organisms, a deposit build up
on the quartz sleeve may occur over time. Maximum recommended parameters
are as follows:
Iron:
<0.3 mg/l Hardness: <120 mg/l Turbidity: < 1 NTU
Manganese: < 0.05mg/l Tannins: < 0.1 mg/l UVT: > 75% at 20 o C
Note: If stated parameters are exceeded pre-filtration is required as water of this
quality can compromise the effectiveness of the UV system. The filters and the
sleeve should be cleaned or replaced as required to maintain them in good
condition. UV transmissibility (UVT) of the water can be tested by your local dealer
or by undertaking an appropriate water test.
Lamp Alarm System
If the UV lamp is out due to a failure or bad connection the alarm buzzer will sound
and the flashing red LED will light continuously. The alarm will disconnect power to
the pump lead preventing untreated water from being delivered. Pressing the
recessed ‘reset’ button once briefly will silence the alarm for 24 hours at a time to
allow checking the connection or lamp replacement and will also reconnect power
to the pump.
The alarm function or lamp can be checked as follows:
1. Switch off mains power to the lamp power supply and remove plug from outlet.
2. Disconnect the lamp.
3. Allow one minute delay to reset the lamp ballast.
4. Reconnect the existing or replacement lamp.
5. Reconnect the power.
The lamp should be replaced after a year’s running time. The alarm will start to
beep intermittently after the internal clock has measured this time as a reminder to
replace the lamp. Pressing the recessed ‘reset’ button briefly with a ballpoint pen
will silence it for 24 hours at a time to allow for a new lamp to be obtained.
Once the new lamp is installed press the ‘reset’ button until the alarm beeps to
start another year’s timing. Do this whenever a new lamp is installed. The red
alarm LED flashes slowly during normal operation to show the timer circuit is
running.