August / 2014
Page 13
DEX & DBX Installation, Maintenance and User Instructions V1.05
A
B
Maintenance and cleaning.
N.B. Maintenance work must only be carried out by a competent person
familiar with instantaneous water heaters.
General cleaning
Do not use strong, corrosive spray or abrasive cleaners / chemicals.
Clean the casing, tap ware, external filter, piping and all other fittings with a
soft cloth and mild soap and water.
Do not spray water over the tap as it may damage the low-voltage electronics.
Caution: Should any of the plastic fittings accidentally come into contact with
cleaners with a PH level less than 4, hypochlorite, hydrogen peroxide or any other
aggressive chemical the affected component must be replaced immediately.
Undersink units must never be located near, or cleaned with water jets. Avoid
using airborne pesticides near the undersink unit.
The electrical and plumbing components should be inspected regularly by a
competent person to ensure proper functioning and operational safety. Water
quality should be considered when determining the frequency of inspection.
Cleaning and replacing the filter strainer
The cold water connection of the appliance is fitted with an integral shut-off
valve and filter strainer. Soiling of the strainer may reduce hot water output
from the unit.
The strainer should be cleaned or replaced as follows:
1. Isolate the electrical supply to the unit.
2. Remove the appliance cover and close the
shut-off valve (see Fig 12) in the cold water
connection piece to position II.
3. Unscrew the plug (A) from the cold water
connection piece and take out the strainer (B)
(see Fig 13).
4. The strainer can now be cleaned or replaced.
5. After re-fitting the strainer re-tighten the plug.
6. Slowly open the shut-off valve in the cold water
connection piece to position I.
7. Vent the unit by opening and closing the hot
water tap several times until all air has been
eliminated from the water heater and no more air
emerges.
8. Re-fit the appliance cover and restore power to
the unit.
Fig 12
Fig 13
II
I
