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Revision n° 2
User manual DEMI-One
Editing: 03/2009
INSTRUMENTS
MAINTENANCE ISTRUCTIONS FOR THE SAFETY VALVE
(WATER BLOCK®)
WATER BLOCK (WB) SAFETY VALVE
Indispensable device for washing machines, dishwashers and demineralizers as, under the conditions defined in the technical features
herewith described, it prevents a flow of water greater than the one for which it has been set by the adjustment pointer. This avoids
continuous leaking. The Water Block also has a particular non-return valve (antipollution). The device should be installed vertically (see
fig. 2) and following the instructions carefully.
TECHNICAL FEATURES
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Burst pressure: 500 N/cm²
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Max. static pressure: 100 N/cm²
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Max. controllable volume: about 50 lt.
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Min. operating capacity: 2 lt/min.
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Max. operating capacity: 30 lt/min
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Max. water temperature: 70° C
USER INSTRUCTIONS
WATER BLOCK should be installed between the tap and the supply hose of the demineralizer (fig. 2). Using the enclosed plastic key,
turn pointer ‘P’ (fig. 1) anticlockwise to the required setting (example, position 1,5).
CAUTION:
For use on other fixtures, set the pointer to a position suitable for that particular application, considering that each number on the scale
corresponds to a controlled volume of approx. 4-6 litres. In case of installation on fixtures which foresee dispensing of drinking water
for alimentary use it is advisable to let flow at least 10 litres of water inside the device before the connection, so as remove eventual
impurities banked during the storage.
INSTALLATION
1.
Manually screw the WB to the tap having suitable thread (3/4” gas), inserting the filter
‘E’ with its convex side facing upwards (fig. 2). The WB will not operate properly if the
filter is not installed correctly. If the WB is tightened or loosened with the aid of a
wrench, the same must be applied to the appropriately octagonally shaped part of the
housing ‘A’.
2.
Screw the supply hose ‘C’ to the lower end of the WB. If the supply hose is equipped
with a filter, the latter must be substituted by a flat rubber washer ‘F’. If the said hose
has to be tightened or loosened with the aid of a wrench, the same must be applied to
the appropriately octagonally shaped part of the WB housing ‘B’ so as to hold it firmly
while performing this operation. If a failure occurs causing a continuous water leak,
the WB will shut off when the volume of water flowing through equals the amount to
which it was previously set with the pointer ‘P’. To reset the Water Block again after
it has shut off, turn the tap off and carry out the necessary repair work. Remove the
supply hose ‘C’ from the Water Block and press the coloured plunger ‘H’ which is
located inside the lower housing of the device itself (fig. 1). It may be difficult to press
this plunger if there is high pressure at the inlet side of the WB. In this case, slacken the
device from the tap: the plunger ‘H’ can then be pressed with ease. Repeat the
operation as described in the section headed ‘Installation’.
CAUTION:
To avoid any possible damage that may be caused by water freezing inside the WB after its
installation, the ambient temperature should never be below 2° C. We decline all responsibility
deriving from the incorrect use of the WB or from its use for applications and/or solutions not
expressly foreseen by the above instructions.
MAINTENANCE:
Depending on the conditions and frequency of usage of the water block, it is recommended to clean out the inlet filter ‘E’
periodically and to replace the seal ‘F’.We reserve the right to modify any features without prior notice.
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