www.graf.info
9 / 22
1. General
information
1.1 Safety
The relevant accident prevention regulations according to BGV C22 must be observed during all work.
Particularly when walking on the tanks, a 2nd person is required to secure the tank.
The relevant regulations and standards must additionally be taken into consideration during installation,
assembly, servicing, repair, etc. Relevant notes can be found in the corresponding sections of these in-
structions.
During all work on the system or parts of the system, the entire system must always be rendered inopera-
ble and secured to prevent unauthorised reactivation.
GRAF offers an extensive range of accessories, all of which are designed to match each other and which
can be extended to form complete systems. The use of other accessories may lead to impediments to the
system's functional capability, therefore invalidating liability for resulting damage.
1.2 Identification
obligation
All service water pipes and outlets must be identified in writing with the words "
Not drinking water
" or in
the form of images (DIN 1988 Part 2, Para. 3.3.2.), this is to avoid inadvertent connection to or with the
drinking water mains even after a number of years. Mix-ups, e.g. by children, may still occur even in the
case of correct identification. All service water extraction points must therefore be installed with valves
that have
child-proof locks
.
2. Installation
conditions
2.1
Optimax XXL Filter external
The GRAF Optimax XXL Filter external is designed for filtering rainwater within rainwater harvesting sys-
tems. The low-maintenance, self-cleaning filter technology is patented and has a water yield of over 95%.
Contaminants are automatically routed to the sewer via the sieve surface. The filter fabric can be cleaned
using the filter cleaning unit incorporate within the product, without the need to disassemble the Optimax
XXL Filter.
The Optimax XXL Filter external is designed for installation in a pilot shaft or a cistern
Direct installation in the ground without protection is not permitted
Ensure that the inflow pipe is long enough to slow down the inflowing water.
The roof area for connection to DN 300 (12”) = 3.000 m² (32.300 ft2), DN 400 (16”) = 6.000 m² (65.000 ft2)
The height difference between inlet and outlet is 45 mm (1,7”)
The mesh width of the stainless steel sieve insert is 0.35 mm (0,01”)
Larger filter designs are available upon request.
