Davey OZOMATIC OZONE GENERATORS - Manual (Page 9)

9
OZOMATIC
®
INSTALLATION FOR SPAS AND POOLS
WITH HIGH BACK-PRESSURE
For in-ground spas where installation of a mini-footwell Injector is not possible, or where back-pressure
is high it is possible to install a High Efficiency Injector in a by-pass around the sand filter. This type of
installation uses the pressure developed across the filter to help drive the injector.
A 3-way valve is plumbed between the pump and filter. Reducing bushed/barbed connectors are fitted to
the valve port that will feed the High Efficiency Injector, 20mm (3/4”) flexible tubing can be used to
connect into the High Efficiency Injector inlet. A Tee - piece is plumbed after the filter with one of its
ports reduced/barbed to allow fitting of the 20mm (3/4”) flexible tubing from the High Efficiency Injector
outlet. Ensure that water flow is in the direction of the arrow on the High Efficiency Injector.
The clear ozone hose should be connected to the injector as shown in the diagram. Ensure that the non-
return valve is fitted in the right direction.
Before starting the pump, close the 3-way valve port to the injector. This means that the port to the filter
will be open.
Start the pump and begin to open the valve port to the injector. Keep opening valve until suction is
achieved. Using the optional gas flow meter, adjust the suction until the correct flow is achieved (8-10 for
MOG 20 and MOG 60, 16-20 for MOG 120).
IMPORTANT - The clear hose comes complete with a non-return valve. Make sure that this valve
is around the right way so that air can be drawn through the ozone unit. If the Ozomatic is to be
installed below water level then the clear hose must be looped above the highest possible point;
otherwise the water could drain out of the spa through the ozone unit causing damage. Warranty is
void if water damage is apparent. Refer to warranty card for detailed conditions.
AN EXAMPLE OF THIS SITUATION IS RETRO-FITTING OF IN-GROUND SPAS AND POOLS WITH FOUNTAINS
OR WATERFALLS
BY-PASS INJECTION FOR SYSTEM WITH BACK-PRESSURE IN RETURN LINES