05/02/2021 Rev.1
11
Valves cleaning HC899
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. 13-14-15-16
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.
4.5 Commonly reported problems
THE PUMP DOES NOT FUNCTION AND THE GREEN LED IS NOT LIT.
Solutions
1. Check that the electrical connection is correctly made.
2. Check that the fuse has not blown
3. Replace the electronic circuit with a new one.
THE PUMP FUNCTION CORRECTLY BUT NO LIQUID IS INJECTED IN THE PLANT
Solutions
1. Check the product level in the tank.
2. Check the foot filter which could be closed.
3. Check the injection valve is not closed.
4. Effectuate a maintenance of the suction and delivery valves. Parts showing any chemical attack,
should be replaced, with alternative materials if necessary.
CHEMICAL LEAKS FROM THE DOSING HEAD.
Solutions
1. Check that the hose clamps are correctly fitted and tightened. Caution do not overtighten these
components as they can easily be broken or threads stripped.
2. Check that the head bolts are tight and that the O-
ring is in it’s correct position. Replace any
damaged or worn parts as necessary.
3. Parts showing any chemical attack, should be replaced, with alternative materials if necessary.
ENGLISH
ENGLISH
