Goetze 481 Manual Del Usuario página 11

6. Remove spring seat
7. Loosen membranes on the outer diameter along entire length with a screwdriver
and unscrew (Fig. 4)
8. Loosen and unscrew low-pressure adapter with hook spanner (optional accessory)
(Fig. 5)
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. 6)
11. To assemble, repeat the sequence in reverse order (see Fig. 7).
Fig. 3
6
Release lock nut on adjusting spindle. Relieve spring of pressure by turning the spindle
in counter-clockwise direction. After unscrewing the upper part and removing the
spring, pull control unit out of the housing (refer to point 5, Fig. 1 and Fig. 2):
in fig. 681:
The strainer can be pulled off in downward direction and cleaned. Slide the cleaned
strainer over the valve insert and reassemble complete insert.
in fig. 682/482/481/HP/LP:
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
a) 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.
Fig. 4
Cleaning the Dirt Trap
Cause of Faults, Remedial Action
Fig. 5
Fig. 6
Fig. 7