4
5
GB
GB
5. Safety Guidelines
1. Use the appliance
●
In good condition
●
According to regulations
●
With due regard to safety
2. Follow installation instructions
3. Immediately rectify any malfunctions
which may influence safety.
4. F 76 S-F water supply filters are
exclusively for use for applications
detailed in these installation instructions.
Any variation from this or other use will
not comply with requirements.
2.3 Differential pressure controlled reverse
rinsing with the DDS 76 and Z 11 AS
Also available as an accessory is the DDS
76 differential pressure switch.
It provides fully automatic operation of the
reverse rinsing which is controlled by the
differential pressure across the filter. It
actuates a reverse rinsing cycle when the
pressure differential between the inlet and
outlet of the filter reaches a predetermined
value. If the pressure difference exceeds
the preset value, then the Z 11 AS reverse
rinsing actuator is operated via its volt-free
input.
3. Maintenance
Planned maintenance is recommended
and DIN 1988, Part 8 specifies the
following operations:
●
The filter must be cleaned regularly by
reverse rinsing and at intervals of no
longer than two months.
- This operation can be carried out by
the user.
●
Filter can become blocked if this is not
done, resulting in pressure drop and
falling flow rate
●
The filter sieves are stainless steel.
Red rust deposits from the pipework
have no effect on function and filter
operation.
4. Scope of Application
Connection sizes
DN 65 - 100
Medium
Water up to max. 70 °C
Operating
pressure
max 16.0 bar
2. Reverse Rinsing
An inlet pressure of at least 1.5 bar is required
for reverse rinsing. The reverse rinsing
interval is dependent on the degree of
contamination of the water. DIN 1988, Part 8
requires that the reverse rinsing interval shall
be no longer than every two months.
To ensure that convenient and regular
reverse rinsing takes place, it is
recommended that a Z 11 AS automatic
reverse rinsing actuator be fitted.
☞
Water can still be drawn during the
reverse rinsing cycle
2.1 Manual Reverse Rinsing
Reverse rinsing is semi automatic if the ball
valve 1 is opened. Opening and closing of
the valve should be gradual and not sudden.
If reverse rinsing is carried out at the
recommended intervals, then a rinsing
duration of between 10 and 20 seconds will
be sufficient. If the filter is particularly dirty,
then a longer reverse rinsing period may be
necessary.
2.2 Automatic Reverse Rinsing with
the Z 11 AS
The Z 11 AS automatic reverse rinsing
actuator is available as an accessory. It
automatically and reliably actuates reverse
rinsing cycles at any preset interval between
four minutes and three months.
1. Installation
It is necessary during installation to
observe codes of good practice, to comply
with local requirements and to follow the
installation instructions. The installation
location should be protected against frost
and be easily accessible. Isolating valves
should be fitted on both sides of the filter.
1.1 Assembly
1. Flush pipework thoroughly.
2. Install filter:
●
With correct flow direction as
indicated by arrow
●
In horizontal pipework with filter bowl
downwards
●
Free of bending or twisting stress
3. Seal in pressure gauge connection
4. The filter is now ready for use.
1.2 Reverse Rinsing Water Drainage
The reverse rinsing water must be piped to
the drain in such a way that no back
pressure can occur.
To ensure this, there are two possibilities:
1. Direct connection to drainage pipework
A DN 40/100 reducing connector and
required DN 100 tundish and pipe
(maximum three 90° bends).
2. Free discharge into existing floor drain.
Filter size
Reverse rinsing quantity*
DN 65 - 100
150 litres
* at 4.0 bar inlet pressure and a rinse duration of
25 seconds
