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Assembly and maintenance instructions - 481/681, 482/682
Release lock nut on adjusting spindle. Relieve spring of pressure by turning the
spindle in counter-clockwise direction. After unscrewing the upper part and remo-
ving the spring, pull control unit out of the housing (refer to point 5, Fig. a up to fig.
g): The strainer can be pulled off and cleaned after removing the bottom O-ring from
the valve insert. After cleaning, slide strainer over the valve insert and insert O-ring
back in the provided groove. Assemble complete valve insert.
7
Cause of Faults, Remedial Action
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Pressure gauge indicates pressure increase
In water heating systems in compliance with DIN 1988 and DIN 4753 the non-return
valve installed between pressure reducer and water heater may be leaking, which,
during the heating process of the boiler, leads to the expanding water of the boiler
causing a rise in secondary pressure at the pressure gauge although the pressure
reducer is operating correctly.
Remedial action:
Replace non-return valve.
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Damage to the seat gasket or membranes
If the back pressure of the pressure reducer increases or if water escapes at the top
of the valve, this may be caused by damage to the seat gasket and/or membranes.
Remedial action:
Restore correct operation of the valve by replacing the valve insert. If water dischar-
ges at the spring bonnet, this may also simply be due to it not being screwed tight.
►
Scale (furring)
Pressure reducers are always to be installed in the cold water supply of the system.
The distance to the non-return valve must be such that no hot water can be applied
to the pressure reducer, even in the event of the fitting leaking. If you do not obser-
ve this rule during the installation there is a risk of the pressure reducer liming up.
Remedial action:
Correct the installation arrangement.
If this is not possible you must replace the complete valve insert from time to time.
6
Cleaning the Dirt Trap
8. Loosen and unscrew low-pressure adapter with hook spanner (optional acces-
sory) (fig. e)
9. Remove O-ring seal
10. Screw the hexagon nuts back onto the threaded bolts. Position two screwdrivers
(used as lever) on the housing and in the groove of the hexagon nut, and pull out
the valve insert (Fig. f)
11. To assemble, repeat the sequence in reverse order (see Fig. g).
