SYR Drufi+ max DFR, Instructions For Use Manual

Page: 6 / 16

6
For backwashing, proceed as follows:
Turn the backwash knob clockwise by 90° in
order to backwash the filter (fig. 2).
When the backwash operation is completed,
turn the backwash knob anticlockwise by 90°
back into the initial position.
Repeat this process, if required.
After backwashing, set the maintenance in-
dicator by means of the slide (fig. 3-1) to the
month of the next backwash operation.
This setting can be read in the inspection
window (fig. 3-2).
How to service the
pressure reducing valve
Verify the set outlet pressure of the Drufi+
max DFR pressure reducer cartridge (DIN
EN 806, part 5) once per year and clean or
replace the cartridge if required.
Close the installation‘s shut-off valve
upstream of the filter (also close the
downstream stop valve if available).
Turn the backwash knob clockwise by 90°
for pressure relief (see section Backwashing)
and put it back into the initial position.
Unscrew the filter cap by means of the filter
cap wrench (order number: 2315.01.927)
(fig. 4).
Remove the pressure reducer cartridge
together with the suction casing and the
suction pot by pulling out upwards (fig. 5).
The spring remains in the filter cap.
First remove the cover and then take the
pressure reducer cartridge out of the sleeve
(fig. 6).
Clean the cartridge‘s diaphragm with cold
and clear water.
Fit the pressure reducer cartridge back into the
sleeve and the cover onto the sleeve (fig. 7).
Make sure that the spring is in correct position
and re-mount the filter cap (fig. 8).
Ensure that the O-ring is in correct
position (has to lie loosely on the upper
convolution - do not slip it over the
thread)!
What to do when the outlet pressure rises?
The pressure increase is probably due to an
unvented water heater located downstream
and has not been hold off by the check valve
upstream of the water heater.
With the water heating system being
disconnected, this problem should not occur
anymore once hot water has been drawn off.
If this effect does not occur again, the check
valve in the water heater‘s safety group has
to be serviced or replaced.
Should this effect still occur with the water
heating system being disconnected, the
problem is due to wear of the pressure
reducer cartridge.
In this case, replace the cartridge as
described in the section “How to service the
pressure reducing valve” on page 3.
Troubleshooting
Only qualified installers are
authorised to install and service the
device. Observe the maintenance
instructions! Do not clean synthetic
parts with solvent-based detergents.
Do not install filters in areas, which
are exposed to UV-radiation (sunlight)
or solvent vapours. Protect the filter
against frost. When submitted to hard
shocks, the synthetic part concerned
shall be exchanged (even when no
damage is visible). Avoid strong water
hammers, caused for instance by
downstream solenoid valves (danger
of burst).
The packaging serves as protection
during transport. Should it be severely
damaged, do not install the device!