FITTING CHEMIGEM BELOW POOL WATER SURFACE LEVEL
The following instructions assume the installer has some knowledge of the operation
of the pool and the parts described. If the installer is not experienced in pool operation
and maintenance, contact the supplier of the Chemigem or a qualified pool maintenance
technician with any questions before attempting to carry out the steps described in this
section.
The Chemigem must be installed within 3 metres of the tapping band and in an upright
position and attached to a solid vertical surface, preferably at eye level. If it is impractical
to install the unit at eye level because of site restrictions, install it at any height above the
solenoid valves that provides ease of access and operation. The solenoid valves need to be
above the height of the chemical drums.
When the pool pump and filter are fitted below the pool water surface level, the suction line
may be under positive pressure even with the pump running. In this case an isolating valve
must be fitted to enable the pump and filter to be serviced.
Fit the tapping band between the isolating valve and the pool pump and close the isolating
valve sufficiently to obtain the required suction so as to allow the unit to operate effectively.
The required suction range is negative 20kPa to negative 70 kPa when the pool pump is
running and the filter is clean.
Methods to obtain improved suction involve using venturi devices or orifice plates. Contact the
supplier of the Chemigem or a qualified pool maintenance technician for information on these.
If the pool pump is more than one metre below the pool water surface it is essential
to fit Non Return Valves into the chemical supply tubing to prevent back-flow into the
chemical drums.
Failure to prevent the back-flow into the chemical drums would cause spillage from the drums,
which in turn may result in the two concentrated chemicals mixing together out of the pool
water and producing poisonous chlorine gas.
In addition, there is the serious possibility of
personal injury from contact with the chemicals and breathing the fumes.
VENTURI SYSTEM
A venturi system is required for:
Special needs, such as fitting a Chemigem below the pool water surface level.
•
Pools that are heated.
•
Pool Controls provides information on the installation procedure for a venturi system.
Pool Controls provides the venturi system at an additional cost.
NEATENING UP
Finish the installation by taping all loose wires and tubing together and place off the ground to
prevent damage and possible electrical shorting.
RAINBOW
POOL
PRODUCTS
PTY
LTD
