Cause Of Malfunction And Remedy; Hygiene Concept - BWT D1 Instrucciones De Instalación Y De Servicio

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3. Turn the adjustment knob anticlockwise until the spring is completely relieved.
Failure to observe this instruction can cause injury!
4. Loosen the hood using a spanner and remove the assembly (Fig. b).
5. Remove the spring set, slip ring, valve insert.
6. If necessary, clean/replace valve insert & groove ring. Regrease the groove ring!
7. For assembly, proceed in the reverse sequence.
8. Set the desired setpoint as described in Chapter 4.
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 anticlockwise,
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 contaminated
or damaged
Remedy: Clean or replace the valve insert.
On water heating systems in accordance with DIN 1988 and DIN 4753, the non-re-
turn 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 boi-
ler heats up its expansion water, despite the pressure reducer working correctly.
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Remedy: Replace the non-return valve.
▪ The pressure on the adjusting scale and pressure gauge do not match
If the scale ring is dismounted from the adjustment knob, the exact positioning of
both parts is released.
Remedy: To reassemble, equalise the scale ring to the current pressure, position
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 regularly
reminded to clean/change 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 upstream pressure side at the latest every 5 years. An
annual exchange is recommended for reasons of hygiene.
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