RainWater Mains Backup in a Box User manual

© 2011 Rainwater Harvesting Ltd - All rights reserved. Carat with Optimax and Rain Director or Mains Backup RWH 042
Rain Director®and Mains Backup in a Box®are registered Trade Marks and may not be used without permission. Page 1
Optional Mains
Water Backup
Optional Rain Director
Management System
Installation guide
Graf Carat rainwater harvesting system
with internal filter and
Rain Director®or
Mains Backup in a Box®
carat_tank_instructions_optimax_mains_backup.doc V12 210812 MB

Rainwaterharvestingsysteminstallation;outdoors
QUICKSTART
Systemswithleaffilterintheturretoftheundergroundtankandsubmersiblepressure‐sensitivepump,productIDnumbersendingGUK1,DUK2,DUK3,DUK4orDUK5
1.Readinadvanceandfollowtheinstallationinstructionsprovidedwiththe
system:yourguaranteeisaffectedifyoudonotinstallcorrectly.
2.Tank:ifthewatertableiswithinametreofthesurfaceofthegroundyoushouldnotinstall
thisstyleoftankbutlooktousingashallowdigtankorinextremecaseswherethewatertable
isveryhighaRondustankwouldbemostsuitable.Otherwisebackfillthetanktotheshoulder
withpeashingle(topsoilroundtheturret),makingsurethatthemanufacturersguidelinesare
followed.
3.Dirtintank:Donotinstallorstartthepumpbeforeallgrit(buildingrubble)andplasticswarf
areremovedfromthebottomofthetankwithaseparatedirtywaterpump
4.Pumpinput:Thepumpissuppliedwithacartridgefilterand1inchstrainerpre‐fittedontothe
inputofthispump.Donotremovetheseasthiscouldinvalidateyourwarranty.
5.Pumppriming:itisessentialthatthepumpisprimedbyremovingthehalfinchblackcapand
pouringapproximately5litresofwaterintothepumpthroughafunnel;failingtodothiswill
causethepumptoburnitselfoutevenifsubmergedandinvalidateyourwarranty.
6.Pumpconnections:outputpipe(usuallysuppliedand25mmHDPE)runsoutofthetopofthe
pumpandiscuttolengthtorun
straightupwardstoaright
angleconnector(Supplied)
fromwhichthepiperunsintothe
housethroughthe4inchservice
pipe.Thisrightangleconnector
mustbewithin30cmsofthe
surfaceoftheground(evenif
extensionsleevesarefitted)sothat
itcanbeundoneinthefuturefor
removalofthepump.
Service
p
i
p
e
Cordfrom
p
um
p
90°Connector
Connectorout
7.Thepumpmustsitsecurelyonthe
floorofthetankinanupright
position,withitsnyloncord
attachedtothewalloftheturret.
Outletpipemustbetightened
securely.
Pum
p
in
p
ut
Cartrid
g
efilter
Primin
g
ca
p
PTO
© 2011 Rainwater Harvesting Ltd - All rights reserved. Carat with Optimax and Rain Director or Mains Backup RWH 042
Rain Director®and Mains Backup in a Box®are registered Trade Marks and may not be used without permission. Page 2

Rainwaterharvestingsysteminstallation;outdoors
  QUICKSTART
8.Pumpfloatswitch:ifthepumpisfittedwithafloatswitch,connectthecablewithanylontie
wraptothepumpoutputpipesuchthatthefloatisfreetofalltojustabovethefloorofthe
tankwhenrainwaterrunsout.Ifyoursystemhasasecondfloatswitchforthemainsbackup,
itsfloatswitchmustbeadjustedsothatitishigherthanthepump’sfloatswitch(bothindown
(empty)position).
9.Piping:Mostwatercompanynowrequirerainwaterpipetobeblackwithgreenstripesto
denotenon‐potablewater.Ensureallpipesexposedtothecoldarefrostprotected.
10.Filter:Ensure4inchdownpipeiscorrectlengthtobringleaffiltertocorrectlevelfortheinput
andoutput4inchpipes.Fitcalmedinlettobaseofdownpipe.Ensure4inchinputandoutput
supportingtheleaffilterintheturretofthetankarefarenoughaparttopermitremovalofthe
filterformaintenance(andtopermitremovalofthepump).
11.Electrical:Connectcable
fromwallsocketin
buildingtoanIP66rated
junctionbox(orsimilar
waterproofbox)fittedtothe
walloftheturretofthe
undergroundtank,thencon‐
nectthecableofthepump
tothejunctionbox.
Junctionbox
Fromroofs
Lea
f
filter

Todrain
Black&greenpipe

PressuresensitiveHydroForcepump
withrundryprotection
© 2011 Rainwater Harvesting Ltd - All rights reserved. Carat with Optimax and Rain Director or Mains Backup RWH 042
Rain Director®and Mains Backup in a Box®are registered Trade Marks and may not be used without permission. Page 3

Installation instructions
These instructions aid assembly of the Graf Carat water tanks, associated plumbing and
mains backup (if fitted), for supplying a domestic or garden water system. Read these and
the manufacturer’s installation instructions (below) thoroughly before starting assembly.
Your guarantee is affected if you do not install correctly
You should also have the instructions for your mains backup option (Rain Director®or
Mains Backup in a Box®) prior to commencing. Each is delivered with the product but you
can get a download at any time at
www.rainwaterharvesting.co.uk/downloads/raindirector_manual.pdf
and
www.rainwaterharvesting.co.uk/downloads/rain_backup_in_a_box.pdf
a) Tank assembly
The GRAF Carat tank comes in two half shells, the upper of which has the aperture for the
tank dome. We supply GRAF Maxi tank domes.
Place the locating pins in the holes round the rim of the lower half, clean off every trace of
grit and dirt from the joint surfaces, lubricate then fit the rubber profile seal in the groove
round the perimeter. Turn the upper half to its correct orientation (two people needed,
and maybe four with the 6500 litre size) and lower it onto the locating pins, making sure
the seal mates with the upper and lower halves.
• The Graf-patented quick connectors (wedges) secure the two halves together (and can
be disassembled if you choose). For the best results, work diagonally, in attaching the
connectors, i.e. after the first, say, at 12 o’clock, secure
a connector on the opposite side of the tank, at 6
o’clock. Then secure connectors at 3 o’clock and 9
o’clock etc. This ensures that the seal is compressed
uniformly. Knock them each tight with a rubber
hammer.
Triple fins of the dome
seal face inwards
• The tank dome seal sometimes needs to be rotated 90
degrees before it is apparent which way it goes. The
single fin goes into the grove in the top of the tank. The
triple fins point towards the centre of the rim and hold
the dome (turret) when inserted. Mount the dome but
leave the man-hole cover off for the time being.
• In the case of the extension sleeve (optional) the rubber seal should be fitted inside
the extension before the green lid is offered up.
• The Graf Carat tank is supplied with the Graf Optimax Filter. The filter is a self-cleaning
mesh filters. The holes in the turret of the tank are positioned to enable plug-and-play
fitting of the filter without the need for any drilling
© 2011 Rainwater Harvesting Ltd - All rights reserved. Carat with Optimax and Rain Director or Mains Backup RWH 042
Rain Director®and Mains Backup in a Box®are registered Trade Marks and may not be used without permission. Page 4

© 2011 Rainwater Harvesting Ltd - All rights reserved. Carat with Optimax and Rain Director or Mains Backup RWH 042
Rain Director®and Mains Backup in a Box®are registered Trade Marks and may not be used without permission. Page 5
b) Installing the tank
Proximity to buildings. The tank must
not be so close to any building that it
compromises the structural integrity of the
foundations. To assess this distance, draw
a line on the side elevation plan from the
base of the foundation at an angle of 45
degrees downwards and away from the
building. No part of the tank should be
within this line.
Slope. On a sloping site the ideal position
for the tank is on a low part of the land.
Rainwater flows readily from all the gutters
to the tank and the submersible pump can
easily pump it back up round the building.
Depth. The maximum depth the tank can
be installed is 1200 mm from Ground to
top of tank excluding dome (turret). We do not support installations deeper than this
because of the difficulty and danger involved in accessing such deep equipment. More
than one Graf extension sleeve or a self made concrete inspection bay using concrete will
invalidate warranty in terms of our technicians retrieving damaged or faulty parts. Ensure
the hole is dug to a depth which permits the tank dome cover to be at the required level
(usually ground level) even though the turret has a lot of leeway for final adjustment.
Complete the mounting of the tank in its final position, leaving the surround of the tank
dome free for piping.
Note: Do not back fill around the tank dome until the collection and soakaway plumbing
has been installed.
Back-filling. Read the manufacturers’ installation instructions (below) thoroughly; the
size of the hole and the procedure for filling with water when backfilling the outside of the
tank are given there. The Carat tanks are strong enough that they do not need concreting
in. Backfill to the shoulder of the tank with pea shingle and round the turret with spoil or
top soil (installation under garden, Graf image page 7) or pea shingle all the way up
(installation under concrete or driveway, Graf image page 5).
x
Surface Water. We advise against letting surface water run
into the tank. Any spill or mess on the ground could get into the
tank. Furthermore, grit and other debris can be destructive to
the pump. Do not run the roof downpipes to the tank through a
ground gutter i.e. only sealed gulleys should be used.
c) Soakaway

It is vital for the self-cleaning function of the Optimax filter that water flows into the turret
and out at a firm flow rate. If there is no main drain on site then ensure that the
soakaway conforms to the following, as shown in the picture below:
(6) To drain or
soakaway
(3) From roof
downpipe
(4) Debris “out” also acts as
overflow if Optimax used
(9) Calmed inlet (not shown)
(2) Underground
storage tank
(7) Filter (Optimax shown here)
(1) Siphon attached to
filter outlet
(8) Filtered
water out
1. The last metre of 110mm (4 inch) drainpipe arriving at the filter should have a drop
of 20 to 50 millimetres (2-5%) to accelerate water flow, i.e. twice the gradient
shown in the manufacturer’s instructions .
2. The first metre of drainpipe after the filter should also have a drop of 20 or 50
millimetres to encourage flow away from the filter, whether or not the U-tube siphon
(as a rodent and odour guard) is fitted.
3. If this overflow/debris outlet does not go to main drain the soakaway must be
constructed to high standard and high volume.
4. The soakaway should be of a volume sufficient to ensure that water does
not back up to the filter.
5. Where appropriate, the overflow/debris outlet pipe should be fitted with an anti-
surcharge or anti-backflow device (BS 8515:2009, ¶ 4.9)
6. The soakaway should be at least two metres away from the tank (do not consider that
back fill round the tank could be used as the soakaway).
© 2011 Rainwater Harvesting Ltd - All rights reserved. Carat with Optimax and Rain Director or Mains Backup RWH 042
Rain Director®and Mains Backup in a Box®are registered Trade Marks and may not be used without permission. Page 6

7. We also recommend building a one metre cubed leaf collection chamber with
manhole between the tank and the soakaway. If the inlet and outlet are close to the
top of this collection chamber then bulky leaves will drop into the chamber and can be
cleaned out of the chamber through the manhole every autumn. The soakaway then
does not clog up with leaves.
Soakaway options
1) Lastmetreof pipe into the tank and firstmetreafter the tankshould have 2-5% drop toensure flow over the filter.
2) If the propertyis surrounded by trees, fit adebris and leaf collector (breeze blocks or brick, say1 metre cubed,with
manhole)before the soakaway.
3) If the ra inwat er storag et ank does not run out to a main drain, the soak aw ay must have c apac ity to ens ure water does n ot
back up to the leaffilteri n thetop ofthe storage tank, otherwise debris will flow into the stored rai nwater. Soakaway can be
cylindricalconcrete piping 80 or 100 cms diameter, bore hole or any format but should be1 to 2 times the volumeof the
rainwater storage tank
2) Debris and leaf collector
if propertysurrounded by
trees.Empty manually if
required
3) Soakawayinany format
should be big enough to
prevent stormwater
backingupto the
rainwaterstorage tank
1) Last metre of pipe into the
tank andfirst metre afterthe
tank should have 2-5% drop to
ens u re f low ov er th e f ilt er
© 2011 Rainwater Harvesting Ltd - All rights reserved. Carat with Optimax and Rain Director or Mains Backup RWH 042
Rain Director®and Mains Backup in a Box®are registered Trade Marks and may not be used without permission. Page 7

d) Fitting the submersible pump
1) The routing connections and inclines are shown in the
manufacturers’ instructions (below).
2) Clean out from the bottom of the tank any grit or debris
which might have fallen there. Use a separate dirty water
pump.
3) Ensure the pump cartridge filter (if supplied) is attached
to the inlet of the pump (usually entering the cylindrical pump housing from the narrow
end) with its arrow pointing towards the pump. And that the 1 inch strainer is attached
onto the input of this filter. The floating intake (which might appear in out-of-date print
material) has been discontinued because in some circumstances it permitted air to be
sucked into the pump.
4) The pump has a 25mm (1 inch) BSP fitting at its outlet, which point upwards. Use the
pipe connector provided with the kit. Fit piping with rainwater markings of 25mm
diameter (1 inch) from the outlet port of the pump. 32mm pipe is acceptable and
better when you are pumping larger distances. It is strongly recommended that you
only use the high density polyethylene (HDPE) pipe supplied between the pump outlet
and the building supply connection.
Fill the pump with
clean water (needs
about 5 litres) and
replace the cap
5) Priming. Before lowering the pump into the tank, prime it by
removing the black screw cap, inserting a funnel and filling it
(about 5 litres of water required). Failing to prime in this way will
burn out the pump and invalidate the guarantee.
6) Pump connections: output pipe (usually supplied and 25mm
HDPE) runs out of the top of the pump (HydroForce or Series 3
type) and is cut to length to run straight upwards to a right angle
connector (Supplied) from which the pipe runs in to the house
through the 4 inch service pipe. This right angle connector must
be within 30cms of the surface of the ground (even if extension
sleeves are fitted) so that it can be undone in the future for
removal of the pump. Note that it is not permitted under the
Water Regulations to feed both mains and rainwater to the
washing machine selectable by a two position cock (risk of
backflow). To provide choice of water source at the washing
machine, fit both the mains and rainwater pipes with the correct
thread to permit the flexible pipe from the washing machine to be
connected to either, manually.
¾ inch: 19 mm
1 inch: 25 mm
1¼ inches: 32 mm
Get the right fit fo
r
pipes and connectors
with the following
conversions:
½ inch: 13 mm
7) Pump float switch: if the pump is fitted with a float switch, connect the cable with a
nylon tie wrap to the pump output pipe such that the float is free to fall to just above
the floor of the tank when rainwater runs out. If your system has a second float switch
for the mains backup, its float switch must be adjusted so that it is higher than the
pump’s float switch (both in down (empty) position).
8) Lower the submersible pump (with supply pipe and electric cable fitted), into the
bottom of the tank, using a cord permanently connected to the pump. The pump must
sit securely on the floor of the tank in an upright position. Secure the cord to the inside
of the tank dome so that you can pull the pump out for maintenance.
© 2011 Rainwater Harvesting Ltd - All rights reserved. Carat with Optimax and Rain Director or Mains Backup RWH 042
Rain Director®and Mains Backup in a Box®are registered Trade Marks and may not be used without permission. Page 8

Route the pump output pipe and electric cable back to the house through the 4inch
service pipe for which there is a third hole in the dome. Block the unused holes with the
black plastic blanks provided. Ensure any pipes exposed to the cold are frost protected. on
arrival at building. Once the installation is completed turn on the pump to pressurise the
system and check all connections for leaks (do this before back filling any buried pipes).
9) Electrical: Connect cable from wall socket in building to an IP66 rated junction box
(or similar waterproof box) fitted to the wall of the turret of the underground tank,
then connect the cable of the pump to the junction box. It is recommended that the
connecting cables are installed by a qualified electrician and any outside connections
complying to IP66 ingress rating. For safety reasons these instructions must be
carefully followed.
e) Fitting filter, siphon, calmed inlet
Follow the manufacturer’s instructions (below) for fitting the Optimax Pro internal filter.
Where some filters require a separate siphon, the overflow siphon here is incorporated in
the Optimax overflow outlet U-tube.
The U-tube siphon outlet from the tank has two functions, 1) the leaf and debris outlet
from the filter and 2) the overflow when the rainwater storage
tank is full. Note that the third 110 mm (4 inch) hole in the
turret is for the service pipe of this size back to the house in
which the feed pipe from the pump and electric cable(s) can
be channelled. It is the installer’s responsibility to ensure that
a) services to the house are secure and protected and b)
connections in the turret permit the later removal of the filter,
pump and other equipment for inspection, maintenance or
replacement.
DEBRIS
OUT
IN FROM
GUTTERS
STORED
RAIN
WATER
Ensure that the three 4 inch pipes arriving at the turret are fitted
with the rubber seals provided with the kit.
Prior to fitting in the tank, connect the 4 inch (100 mm)
downpipe to the filter and the calmed inlet (which prevents
filtered rainwater from disturbing any sediment on the bottom of
the tank) to the bottom of this pipe. Although the friction fit top
and bottom is almost adequate we recommend adding a pair of
self-tapping screws to keep the pipe in the filter and the calmed
inlet on the pipe; this avoids losing one or more elements when
it comes to pulling the filter assembly out of the tank for
maintenance purposes.
Ensure 4inch downpipe (Supplied) is correct length to bring leaf
filter to correct level for the input and output 4inch pipes. Ensure
4inch input and output supporting the leaf filter in the turret of
the tank are far enough apart to permit removal of the filter for maintenance (and to
permit removal of the pump).
© 2011 Rainwater Harvesting Ltd - All rights reserved. Carat with Optimax and Rain Director or Mains Backup RWH 042
Rain Director®and Mains Backup in a Box®are registered Trade Marks and may not be used without permission. Page 9

Place the filter assembly with U-tube in the centre of the tank with the calmed inlet on the
bottom. Attach the filter input to the 4 inch rainwater pipe from the roof with the slip
collar provided and slide the U-tube outlet through the tank (from inside to out) then
connect to the 4 inch pipe to drain or soakaway, similarly.
Did you prime the pump? If not, take it out and do it now. See page 8.
f) Connecting the mains back-up
© 2011 Rainwater Harvesting Ltd - All rights reserved. Carat with Optimax and Rain Director or Mains Backup RWH 042
Rain Director®and Mains Backup in a Box®are registered Trade Marks and may not be used without permission. Page 10
You should read the instructions for your mains backup option (or prior to commencing. Individual
instructions are delivered with the product but you can get a download at any time:
Rain Director®www.rainwaterharvesting.co.uk/downloads/raindirector_manual.pdf
Mains Backup in a Box®www.rainwaterharvesting.co.uk/downloads/rain_backup_in_a_box.pdf
Note: if you are fitting a rain manager with integral pump, fitted inside the
building, then there is no pump submerged in the tank.
Aquaprof rain manager www.rainwaterharvesting.co.uk/downloads/aquaprof.pdf

[e-mail]
www.graf-online.de
Page 1 of 9
Table of contents:
1. General notes Page 2
1.1 Safety
1.2 Identification obligation
2. Installation conditions Page 3
3. Technical data Page 4
4. Tank structure Page 5
5. Installation and assembly Page 5
5.1 Construction site
5.2 Trench
5.2.1 Installation on a slope
5.2.2 Installation in the case of groundwater
5.2.3 Installation adjacent to surfaces
used by vehicles
5.2.4 Connection of several tanks
5.3 Insertion and filling
5.4 Routing connections
6. Assembling the tank dome and
telescope Page 8
7. Inspection and servicing Page 9
The points described in these
instructions must be
observed under all
circumstances. All warranty
rights are invalidated in the
event of non-
observance.
Separate installation
instructions are enclosed in
the transportation packaging
for a
ll additional articles
purchased from GRAF.
Missing instructions must be
requested from us
immediately.
The tank must be checked for
any damage prior to insertion
into the trench under all
circumstances.
Installation must be carried
out by a specialist company.
2700 L Order No. 370001
3750 L Order No. 370002
4800 L Order No. 370003
6500 L Order No. 370004
7500 L Order No. 370007
9600 L Order No. 370008
13000 L Order No. 370009
Installation and maintenance instructions for GRAF
rainwater storage tank, Carat series

[e-mail]
www.graf-online.de
Page 2 of 9
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 instructions.
The system or individual parts of the system must be installed by
qualified specialists.
During all work on the system or parts of the system, the entire system
must always be rendered inoperable and secured to prevent
unauthorised reactivation.
Except in the event of work carried out in the tank, the cover of the tank
must always be kept sealed, as this otherwise constitutes a maximum
risk of accident. The rain protection installed on delivery is merely
transportation packaging. It cannot be walked on and is not child-
proof; it must be replaced with a suitable cover immediately
following delivery (telescopic dome shaft with corresponding cover)!
Only original GRAF covers or covers approved in writing by GRAF must
be used.
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.) in order to avoid inadvertent connection 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 with child-proof locks.
1. General notes

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2. Installation conditions
Coverage heights with telescopic dome shaft in
green areas.
Maximum coverage heights with intermediate
section and telescopic dome shaft (in green
areas only, without groundwater and stratum
water).
Coverage heights with cast
telescopic dome shaft
(class B) in areas used by passenger cars
(without groundwater and stratum water).
Coverage heights with Be
gu telescopic dome
shaft (with cover class D –
to be provided at
construction site) in areas used by trucks with a
max. weigh
t of 12 t (without groundwater and
stratum water).
Coverage heights on installation in groundwater
–
the hatched areas specify the permissible
immersion depth for the adjacent tank size
(not under areas used by passenger cars or
trucks).
Mini telescopic dome shaft Maxi telescopic dome shaft +
cast telescopic dome shaft

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*Set consisting of two Carat underground tanks
**Htot = total height
Tank 2700 litres
3750 litres 4800 litres 6500 litres 7500 litres* 9600 litres* 13,000 litres*
Art. No. 370001 370002 370003 370004 370007 370008 370009
Weight 120 kg 150 kg 185 kg 220 kg 300 kg 370 kg 440 kg
L 2080 mm 2280 mm 2280 mm 2390 mm 2280 mm 2280 mm 2390 mm
W 1565 mm 1755 mm 1985 mm 2190 mm 4110 mm 4570 mm 4980 mm
H 1400 mm 1590 mm 1820 mm 2100 mm 1590 mm 1820 mm 2100 mm
Htot 2010 mm 2200 mm 2430 mm 2710 mm 2200 mm 2430 mm 2710 mm
3. Technical data
Htot
Htot

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4. Tank structure
Cover
Telescopic dome shaft (can be inclined by 5°)
Profile seal
Tank dome (can be rotated by 360°)
Tank - tank dome seal
Carat underground tank
Subsoil Covering layer
Telescopic dome shaft Carat underground tank
Compacted foundation Concrete layer for surfaces
Surrounding (round-grained gravel, max. used by passenger cars
grain size 8/16)
5. Installation and assembly
ß according to DIN 4124
5
2
3
6
4
1

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5. Installation and assembly
5.1 Construction site
Under all circumstances, the following points must be clarified prior to installation:
- The structural suitability of the ground according to DIN 18196
- Maximum groundwater levels which occur and drainage capability of the subsoil
- Types of load which occur, e.g. traffic loads
An expert ground report should be requested from the local planning authority to determine the
physical characteristics of the subsoil.
5.2 Trench
To ensure that sufficient space is available for working, the base area of the trench must exceed the
dimensions of the tank by 500 mm on each side; the distance from solid constructions must be at least
1000 mm.
The embankment must be designed according to DIN 4124. The construction site must be horizontal
and plane and must guarantee sufficient load-bearing capacity.
The depth of the trench must be dimensioned so that the max. earth coverage (see point 2 –
installation conditions) above the tank is not exceeded. To use the system throughout the entire year,
it is necessary to install the tank and those parts of the system which conduct water in the frost-free
area. The frost-free depth is usually approx. 600 mm – 800 mm; precise information in this regard can
be obtained from the responsible authority.
A layer of compacted, round-grain gravel (grain size
8/16, thickness approx. 150 - 200 mm) is applied as the
foundation.
5.2.1 Slope, embankment, etc.
On installation of the tank in the immediate vicinity (< 5
m) of a slope, earthen mound or slope, a statically
calculated supporting wall must be erected to absorb
the soil pressure. The wall must exceed the dimensions
of the tank by at least 500 mm in all directions, and
must be located at least 1000 mm away from the tank.
5.2.2 Groundwater and cohesive (water-
impermeable) soils (e.g. clay soil)
If it is anticipated that the tanks will be immersed
deeper into the groundwater than is shown in the
adjacent figure, sufficient dissipation must be ensured.
(See table for max. immersion depth).
Dissipation of the drainage water (e.g. via an annular
drainage system) is recommended in the case of
cohesive, water-impermeable soils.
5.2.3 Installation adjacent to surfaces used by
vehicles
If the underground tanks are installed adjacent to
surfaces which are used by heavy vehicles weighing
over 12 t, the minimum distance away from these
surfaces is at least the depth of the trench.
Tank size 2700 L 3750 L 4800 L 6500 L 7500 L 9600 L 13,000 L
Immersion
depth 1400 mm 1590 mm 910 mm 1050 mm 1590 mm 910 mm 1050 mm

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5. Installation and assembly
5.2.4 Connection of several tanks
Two or more tanks are connected via the
assembly surfaces by means of GRAF
special seals and basic drainage pipes
(to be provided at construction site). The
apertures must be drilled to the
corresponding size using only the GRAF
special crown bit. It must be ensured that
the distance between the tanks is at least
600 mm. The pipes must project at least
200 mm into the tanks.
5.3 Insertion and filling
The tanks must be inserted, impact-free,
into the prepared trench using suitable
equipment. To avoid deformities, the tank
is filled 1/3 with water before filling in the
tank surrounding.
Afterwards the surrounding (roundgrain
gravel, max. grain size 8/16) is then filled
in layers of max. 30 cm steps and is
compacted.
The individual layers must be well-
compacted (manuel tamper). Damage to
the tank must be avoided during
compaction. Mechanical compaction
machines must not be used under any
circumstances. The surrounding must be
at least 500 mm wide.
5.4 Routing connections
All feed and overflow pipes must be routed
with a decline of at least 1% in the
direction of flow (possible, subsequent
settling must be taken into consideration in
this case). If the tank overflow is
connected to a public sewer, this must be
protected against reflux by means of a
lifting station (mixed sewer) or reflux seal
(pure rainwater sewer) according to DIN
1986.
–All suction, pressure and control lines
must be routed in an empty pipe, which
must be routed as straight as possible,
without bending, to the tank with a decline.
Necessary bends must be formed using
30°moulded sections.
Important: The empty pipe must be
connected to an aperture above the max.
water level.
S
e
wer

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6. Assembling the tank dome and telescopic dome shaft
6.1 Assembling the tank dome
Prior to actual assembly, the enclosed seal is inserted into the tank domes’s realing groove (A), the
tank dome is then aligned with the pipes and is locked to
the tank. Once engaged, it can no longer be rotated.It
must be absolutely paid attention to the seat of the upper
seal.
6.2 Assembling the telescopic dome shaft
The telescopic dome shaft enables infinite adaptation of the
tank to given site surfaces with earth coverage of between 750
mm and 950 mm (Mini telescopic dome shaft) or 750 mm and
1050 mm (Maxi telescopic dome shaft).
For assembly purposes, the enclosed profile seal (material
EPDM) is inserted into the tank dome's sealing groove and is
coated generously with soft soap (do not use mineral oil-based
lubricants, as these attack the seal). The telescope is then
greased, inserted and aligned with the surface of the site.
6.3 Telescopic dome shaft on which persons
may walk
Important: To prevent loads from being transferred onto the
tank, round-grain gravel (max. grain size 8/16) is filled in in
layers around the telescope and is evenly compacted.
Damage to the tank dome and telescope must be avoided
during this step. The cover is then positioned and is sealed to
prevent entry by children. Tighten the threaded connection
on the cover so tightly that it cannot be opened by a child!
6.4 Telescopic dome shaft over which passenger cars
may drive
If the tank is installed under areas used by passenger cars, the
collar area of the telescope (colour anthracite) must be
supported with concrete (load class B25 = 250 kg/m²). The
layer of concrete to be installed must be at least 300 mm wide
and approx. 200 mm high all around. The minimum coverage
above the shoulder of the tank is at least 800 mm (max. 1050
mm with telescope, coverage up to max. 1200 mm possible
with intermediate section).
Attention: Use the cast cover under all circumstances.
A

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7. Inspection and servicing
6.5 BEGU telescopic dome shaft
On installation under areas used by trucks with a
maximum weight of 12 t, the telescope is supported as
described in point 6.2. The concrete rings (Ø 600 mm)
and a cast frame with star-shaped load distribution for
mounting the cast cover are then installed (observe earth
coverage of at least 800 mm, max. 1200 mm). The cast
frame must have a supporting area of approx. 1 m².
6.6 Assembling the adapter
For lager coverage heights a adapter is needed. To insert
the adapter into the tank dome, soft soap is needed. Into
the highest groove of the adapter the profile seal is
inserted an greased generously. Afterwards push the
telescopic dome shaft into the adapter and adapt it to the
planned area surface.
1 Adapter = max. earth-cover 1.350 mm
2 Adapter = max. earth-cover 1.500 mm
(in each case in connection with the Maxi telescopic
dome shaft)
The entire system must be checked for leaks, cleanliness and stability at least every three months.
The entire system should be serviced at intervals of approx. 5 years. In this case, all parts of the
system must be cleaned and their function checked. Servicing should be carried out as follows:
- Drain the tank completely
- Clean surfaces and internal parts with water
- Remove all dirt from the tank
- Check that all internal parts are firmly seated.
6. Assembling the tank dome and telescopic dome shaft
Otto Graf GmbH – Carl-Zeiss-Str. 2-6 – D-79331 Teningen – Tel.: [phone] – Fax: [phone]
Graf SAS – 45, Route d´Ernolsheim – F-67120 Dachstein Gare – Tel.: [phone] – Fax: [phone]
Graf Iberica – Sant Miguel 37 – ES-17003 Girona – Tel.: [phone] – Fax: [phone]
Telescopic dome shaft (can be inclined by 5°)
Adapter
Tank dome (can be rotated by 360°)

Seite 1 von 8
Optimax-Pro Filter Intern
Art.-Nr.: 340037
Filtre Optimax-Pro interne
Réf.: 340037
Optimax-Pro Filter internal
Item No.: 340037
Ausbaupaket 3
Art.-Nr. 342005
Pack accessoires n°3
Réf.: 342005
Filter package 3
Item No.: 342005
Anleitung für Einbau und Wartung Optimax-Pro Filter Intern
Notice de montage et d’utilisation du filtre Optimax-Pro interne
Instruction for installation and maintenance Optimax-Pro Filter internal
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Sommaire:
1. Généralités Page 2
2. Conditions d’installation Page 4
3. Spécifications techniques Page 5
4. Assemblage Page 6
5. Montage Page 6
6. Accessoire Page 8
7. Maintenance Page 8
Outline:
1. General advices Page 2
2. Installation conditions Page 4
3. Technical specifications Page 5
4. Assembly Page 6
5. Installation Page 6
6. Accessory Page 8
7. Maintenance Page 8
Inhaltsübersicht:
1. Allgemeine Hinweise Seite 2
2. Einbaubedingungen Seite 4
3. Technische Daten Seite 5
4. Aufbau Seite 6
5. Einbau Seite 6
6. Zubehör Seite 8
7. Wartung Seite 8
Otto GRAF GMBH, Carl-Zeiss-Straße 2-6, 79331 Teningen – Tel.: [phone], Fax: [phone] – www.graf-online.de, [email protected]
GRAF SA - 45, route d'Ernolsheim, F- 67120 Dachstein-Gare – Tel.: [phone], Fax: [phone] – www.graf.fr, [email protected]