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REPLACING THE EXTERNAL INJECTION SEALS
WARNING: Before performing any work on the DOSATRON, you must
read to the Precautions section, page 17.
NOTA: Before dismantling, and to avoid any contact with the injected
additives, turn on the DOSATRON and allow it to draw in clear water in order
to rinse the injection assembly.
If used in hard water, we recommend descaling the external injection
assembly, at intervals to be confirmed on site.
Disconnect the nuts shown in the diagram.
Replace the O-rings, duckbill valve, diaphragm and silicone umbrella valves +
valve seat (not the just the umbrella valve)
Reassemble all components in the reverse order, ensuring that the diaphragm
and valve seat are installed in the correct position (see diagram below).
fig 48
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