aqua HC797 Manuel page 17

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3.4 Replacing worn parts
Fuse replacement.
Proceed as follows:
1. Put at minimum the knob of the piston regulation of the run (in the pump where it is present)
2. Unscrew the fixing screws of the box
3. Open the front and the back part of the box minding the spring of the knob where it is present.
4. Replace the fuse that is well visible.
5. Assemble all the parts paying attention that the piston regulation knob (where it is present) is at
the minimum position and that the spring is in .
Valves cleaning HC797- HC897-HC997
Proceed as follow:
1 With a little tool extract the valve cartridges from their seats
2 Pay attention not to loose the oring at the bottom of the cartridge
3 Clean the valve cartridge with clear water
4 For a complete cleaning it is possible to open the valve cartridge, be carefull with all the internal
parts
5 Assemble again the valve cartridge following drawing fig. 11
6 Insert again the valves cartridges in their seats
Diaphragm and O-rings replacement
Proceed as follows:
1. Undo the 4 bolts with an hexagonal key.
2. Remove the pump head.
3. Remove the old O-ring from the head carefully using a small screw driver.
4. By hand, or with pliers if necessary unscrew the diaphragm, and replace with the new one. Hand
tight only. Before screwing the diaphragm into place, add a small quantity of Loctite® 222 onto the
thread.
5. Refit the dosing head, tightening the head bolts sequentially and carefully to ensure an even
airtight seal. Caution do not over tighten. We also recommend adding a few drops of Loctite® 222
on to the thread of the screws that hold the head.
28/05/13 Rev.2.6 17