Maintenance
U-Tube
The U-tube must be as supplied and remain free of obstructions or
‘kinking’ that might inhibit waste flow out of the Mixing Chamber. For
the start sequence to ignite the flame, the U-tube must be filled to
overflowing with water.
NOTE: To clean, use a detergent solution (Decon50™) with
subsequent thorough rinsing with tap water. Do not use organic
solvents or alcohol based cleaners. They may cause the tubing
material to expand and lead to permanent damage.
Drain Cup Cleaning
The Drain Cup has a float sensor that the firmware monitors during
the Start Up cycle to ensure that the U-tube is filled with water. For
the sensor to operate, be sure that the inner tube is filled to
overflowing. The only maintenance needed is occasional cleaning.
Level Sensor – used to
ensure there is adequate
fluid in the U-tube.
Thumbscrew
Drain Cup
U-Tube
1. Unplug the mains power cord.
2. Remove the U-tube and waste tube, taking care not to spill
water.
3. Undo the thumbscrew and carefully drop the drain cup from the
bracket and away from the level sensor.
4. To remove the Level Sensor from the bracket; hold the body of
the sensor and unscrew the dome nut using a 10mm AF side
spanner. Carefully slide the dome nut up the cable. Drop the
sensor down and pass the cable through the slot in the rear of
the mounting bracket. Unplug the level sensor connector from
the instrument and then carefully remove the sensor.
5. Clean with a detergent solution, mild acid, or Decon 90® (2-5%
mix with deionised water). Rinse thoroughly with water. Avoid
any solution contact on the lead, connector or down the top of
the sensor. If this occurs, allow all parts to completely dry before
refitting.
6. Check the level sensor float moves up and down freely without
sticking. If necessary flush with deionised water to remove any
salt deposits and recheck.
7. Move the drain cup back into position and secure with the
thumbscrew.
8. Reattach the U-tube and waste tube.
9. When refitting the sensor to the bracket, note that the hole in
the bracket is a larger diameter than the sensor thread. This
enables the sensor to be centralised within the drain cup.
Dome Nut
Level Sensor Body
Slot in Mounting Bracket
(below nut)
42
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