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Installation instructions & user manual
9120-34373 v4.00 Nov 2018 - ZIP DBX DEX
Technical support
Tel: 0345 6 005 005 email: [email protected] www.zipwater.co.uk
MAINTENANCE & CLEANING
General cleaning
Purging after maintenance work
This instantaneous water heater features an automatic air bubble protection system to prevent it from
inadvertently running dry. Nevertheless, the appliance must be purged of air before using it for the first time.
Each time the appliance is emptied (e.g. after work on the plumbing system, if there is a risk of frost or following
repair work), the appliance must be re-purged before it is used again.
• Disconnect the instantaneous water heater from the mains power supply.
• Unscrew the jet regulator on the outlet fitting and open the cold water tap valve to flush out the water pipe
and avoid contaminating the appliance or the jet regulator.
• Open and close the hot water tap until no more air emerges from the pipe and all air has been eliminated
from the water heater.
• Only then should you re-connect the power supply again to the instantaneous water heater and screw the jet
regulator back in.
• The appliance activates the heater after approx. 10 seconds of continuous water flow.
• Plastic surfaces and fittings should only be wiped with a damp cloth. Do not use abrasive or chlorine-based
cleaning agents or solvents.
• For a good water supply, the outlet fittings (special tap aerators and shower heads) should be unscrewed
and cleaned at regular intervals. Periodically, the electrical and plumbing components should be inspected
by an authorised professional in order to ensure proper functioning and operational safety at all times.
Note: Maintenance work must only be carried out by a competent person familiar with instantaneous
water heaters.
Cleaning and replacing the filter strainer
The cold water connection of this instantaneous water heater is
equipped with an integrated shut-off valve and a strainer. Soiling of
the strainer may reduce the warm water output. Clean or replace the
strainer as follows:
• Disconnect the instantaneous water heater from the mains power
supply and take steps to prevents its inadvertent re-connection.
• To open the cover, take off the small fascia plate, loosen the screw
behind this fascia plate to remove the cover.
• Close the shut-off valve (a) in the cold water connection piece
(position “closed“).
• Unscrew the screw plug (b) from the cold water connection piece
and take out the strainer (c).
• The strainer can now be cleaned or re placed.
• After fitting of the clean strainer tighten the screw plug.
• Slowly reopen the shut-off valve in the cold water connection piece
(position “open“).
• Vent the appliance by carefully opening and closing the warm water
tap several times until air no longer emerges from the pipe.
• Re-fit the front cover. Then switch on the power supply.
(a)
closed
open
(c)
(b)
Strainer
Fig. 16
Fig. 15
