Cause Of Malfunction And Remedy; Hygiene Concept - BWT D1 Einbau- Und Bedienungsanleitung

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Remove the filter screen
1. Shut off the water supply and relieve the valve of pressure.
2. Loosen the filter screen cup by hand/with a spanner by turning anticlock-
wise, and remove (Fig. c). Make sure that the filter screen cup is not
damaged. If it is damaged, be sure to replace it with a new part.
3. Remove the screen.
4. Clean/replace the screen and grooved ring as required.
5. Assemble in the reverse sequence.
6. Make sure that the grooved ring and and the O-ring are in the correct
position.
7. Tighten the filter screen cup flush by hand (max. 5 Nm).

7. Cause of malfunction and remedy

▪ Back pressure increases above the setpoint - valve insert is contami-
nated or damaged
Remedy: Clean or replace the valve insert.
On water heating systems in accordance with DIN 1988 and DIN 4753, the
non-return
valve installed between the pressure reducer and water heater can leak. If
this oc-curs, the pressure gauge can indicate a rising back pressure when
the boiler heats up its expansion water, despite the pressure reducer working
correctly.
Remedy: Replace the non-return valve.
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▪ The pressure on the adjusting scale and pressure gauge do not match
If the scale ring is dismounted from the adjustment knob, the exact positio-
ning of both parts is released.
Remedy: To reassemble, equalise the scale ring to the current pressure, posi-
tion and mount. (Fig. d)
▪ Water escapes from the spring hood
If water escapes from the spring hood, either the spring hood is not correctly
mounted or the diaphragm is damaged.
Remedy: Tighten the spring hood or replace the valve insert.
▪ Low water pressure
If the installation is correct but a low water pressure prevails on the outlet
side, a clogged screen could be the cause.
Remedy: Clean or replace the screen.

8. Hygiene concept

With the reminder service in the BWT Best Water Home App, you are regular-
ly reminded to clean the filter sieve in the pressure reducer. The self-control of
the pollution is easy to carry out using the transparent cup. If it is necessary,
the large stainless steel sieve is easy to replace.
Without a filter installed on the upstream pressure side, the filter screen
should be replaced at least every 2 years, with a filter installed on the upstre-
am pressure side at the latest every 5 years. An annual exchange is recom-
mended for reasons of hygiene.
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