Hydrotech DLR-4M_7M Ultraviolet Water Disinfection Unit - Manual (Page 15)

O & M Manual DLR-M, 4-7
08/05 – Rev. 6 15
Maintenance,
Continued
Replacing the
O-Ring General maintenance for the O-Ring requires that you replace it every 365 days. If,
however, during routine cleaning of the quartz sleeve, you find the O-Ring cut,
damaged, or extremely dirty, then it should be replaced at this time. To replace the
O-Ring, follow the directions for cleaning.
Cleaning the
sensor quartz Clean the sensor quartz during routine cleaning of quartz sleeve and at least every
365 days.
Step Action
1 Fill a bucket or other receptacle with warm, soapy water.
2 Turn off the water supply to the disinfection unit.
3 Disconnect all power to the disinfection unit.
4 Drain the system: Have a bucket large enough to hold the water in the chamber,
close both shutoff valves, and open the drain to draw off the water.
5 By hand, carefully turn the sensor assembly counter-clockwise to remove it from
the sensor port on the disinfection chamber. Do not disassemble the sensor unit.
6 Clean the sensor quartz (quartz window) and O-Ring with warm soapy water.
Mild acid (such as citric acid or Lime-Away) may be used on the sensor quartz, if
needed. Rinse well.
7 Make sure that all surfaces of the sensor quartz are clean to ensure a good seal and
replace the sensor assembly on the sensor port, turning clockwise on the threaded
nipple. Hand-tighten only.
8 Restart your disinfection unit according to the start-up sequence for your model
specifications.
9 Record the date in the maintenance log.
10 Sanitize your water system (see directions in this section).
Sanitizing the
system Before initial use of your UV unit and after routine maintenance procedures, you
should sanitize your water system to ensure that no organisms are present.
Step Action
1 Pour household bleach into your water system. If you have a filter container, fill it
with bleach. If you have no filter then introduce chlorine directly into your well.
The amount of chlorine depends upon the diameter and depth of your well.
(Generally, use ½ gallon to treat an 8” diameter/80’ deep well and one gallon for
anything larger.) You may contact your State Extension Service or a water
treatment specialist for additional information.
2 Open hot and cold water taps throughout the house and let the water run until you
detect a chlorine odor. To ensure that the hot water heater is also purged, allow
the hot water to run until the water becomes cold.
IMPORTANT! Yo u may get a low UV alarm buzzer after introducing chlorine into
your water system. Press the RESET button until the buzzer stops. This will
disable the buzzer for 5 days. The UV system will reset automatically once all
chlorine has been flushed through the UV vessel with fresh water.
3 Turn off the taps and allow the water to stay in the pipeline for about six hours or
overnight but not more than 36 hours to avoid corrosion.
4 Open hot and cold water taps throughout the house and let the water run until the
chlorine odor disappears.