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4 SYSTEM INSTALLATION – (PLUMBING & ELECTRICAL)
4.1 GRAVITY (HEADER TANK) SYSTEM INSTALLATION.
4.1.1 Please refer to the GRAVITY SYSTEM Guide Sheet (at the end of this section) throughout these instructions.
As you are installing a GRAVITY system it is assumed that you have MAINS WATER SUPPLY available and
you wish to use MAINS water in this scheme by the installation of a header tank. In all cases, this equipment
should be installed by competent, qualified personnel and should comply fully with all the relevant regulations,
particularly the current Water Regulations and the current edition of the IEE regulations concerning the safe
installation of such equipment. Be safe.
4.1.2 It is assumed that you have read and understood the Tank Installation Instructions, the Tank is IN SITU but not
backfilled, and you must now consider the installation of the pipe work and cable runs.
4.1.3 Please be aware that there are connections to the pump and depth sensor, located in the tank, which must
exit via the turret. If you intend using extension rings on the tank turret please bear this in mind. If there is any
doubt regarding the ability to carry out these connections due to such extensions, you may need to consider
an access chamber. Consult with a qualified civil engineer in this circumstance, particularly regarding the
surface loading.
4.1.4 Study the GRAVITY Guide Sheet and decide on the following:
1) The route by which you will take the surface drain pipes back to the tank from the gullies and whether
you are fitting a Rain Water Filter or not.
2) The route of your Tank Overflow Pipe. Note.
3) The route and inverts for pipe work from any manifold chamber collection points or Rainwater Filter.
4) The location of the Control Panel. Note that this unit should be mounted under cover, protected from frost,
and be located at a convenient height of between 1.5 meters and 2.4 meters above ground level. If you
wish to mount the unit in any other location please contact ENVIREAU for further advice.
The following instructions, up to and including Item (9) involve essentially Civil and Plumbing
work. The Electrical Installation begins at Item (10).
Once you are confident in your choice of locations you should begin by laying in the pipe work and
electrical ducts as shown on the Guide Sheet. The collection pipes should be 110mm and should be
connected to the roof drainpipes via sealed gullies, which prevent the ingress of surface water.
WARNING. Surface water can contain many contaminants and the system will not function
correctly with contaminated water. Keep your installation clean, particularly the tank, to avoid
blocked filters and valves etc.
You may be forced by site conditions to install pipe work in a different order to that suggested below,
but for the sake of clarity the instructions follow the Guide Sheet sequence. The first stage is to install the
pump plumbing pipe work.
NOTE. You are strongly advised to leave the installation of the pump itself until you are ready
to electrically connect it in to the Control Panel. See step (13) following.
5) Refer to the Guide Sheet DIAGRAM A. The pump outlet source is the tank connector supplied with
the tank. Make certain that it is securely tightened in to the tank turret. Cut the MDPE 25mm (black)
pipe squarely and clean off rough edges. Use an insert in the end of the pipe if recommended by the
supplier. Make sure that the pipe and tank connector are clean and free from grit and soil etc. Do not insert
the pipe if the portion to be inserted is badly scratched or striated. With the collet loose on the tank
connector, insert the pipe fully home then tighten the collet. Once tightened, check the fitting nut, tank side,
for tightness. (Do not over tighten.)
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