Valve Plunger Assembly shown in Figure 2, move freely
to the left.
NOTE
When removing the Handhole Cover, first loosen all of the
Cover Bolts, and then remove all but two of the Cover Bolts.
Remove the last two Cover Bolts while securely holding the
Handhole Cover, so as to prevent dropping the Handhole
Cover which could result in personal injury.
8. With your left hand holding the Clapper Assembly and
your right hand pushing the Latch Pawl (Fig. 3), unlatch
the Clapper Assembly and carefully lower the Clapper
Assembly into the set position with the Clapper Arm (7 -
Fig. 2) under the Retaining Lever (21 - Fig. 2).
NOTE
Use care when lowering the Clapper Assembly to avoid
pinching your fingers, and make certain that the Clapper
Assembly is fully seated (i.e., not latched in either the first or
second positions shown in Figure 3).
9. Reach into the handhole opening and while holding onto
the Differential Valve Plunger (31 - Fig. 2), rotate the Dif-
ferential Valve Plunger and pull it towards the Retaining
Lever. As the Differential Valve Disc (36 - Fig. 2) seats
against the Differential Valve Seat (30 - Fig. 2) within the
Differential Valve Housing, some resistance to rotation
should be felt to indicate adequate seating.
10. Inspect the Handhole Cover Gasket for breaks and re-
place the Handhole Cover and Handhole Cover Gasket.
Tighten the Handhole Cover Bolts with a cross-draw se-
quence.
11. Replace all damaged or operated sprinklers. Replace-
ment sprinklers must be of the same type and tempera-
ture rating as those which operated.
NOTE
In order to prevent the possibility of a subsequent operation,
any solder type sprinklers which were possibly exposed to a
temperature greater than their maximum rated ambient must
also be replaced.
12. Service the air dryer, if applicable, in accordance with
the manufacturer’s instructions.
13. Open (energize) the Solenoid Valve (Fig. 7) by manually
operating the releasing panel.
14. Open the Differential Chamber Supply Control Valve
(Fig. 7) and allow water to discharge from the Dry Pilot
Actuator.
15. Close the operating lever of the Manual Control Station
(Fig. 7). Close the hinged cover and insert a new break
rod (#922891008) in the small hole through the top of
the enclosing box.
16. Return the Solenoid Valve to its normally closed position
by resetting the releasing panel, and allow time for full
pressure to build up in the Differential Chamber.
Observe the Vent Fitting (23 - Fig. 6) connected to the
Neutral Chamber for leaks. If there are leaks, the Differ-
ential Valve Assembly may not be properly seated and
the Differential Valve Assembly must be inspected. De-
termine/correct the cause of the leakage problem by re-
ferring to the Maintenance and Service section.
17. If resetting after a test, fully open the System Shut-Off
Valve (Fig. 1).
18. Open the Air Supply Control Valve and pressurize the
sprinkler system in accordance with Figure 5.
19. Inspect the drain connections from the Dry Pilot Actua-
tor and Manual Control Station for leaks. Leaks, if any,
must be corrected before the system is restored to serv-
ice.
20. Reset the S430 Accelerator (Fig. 8) using the following
Steps a through l, if the system is so equipped; other-
wise, proceed to Step 21.
a. Close the Accelerator Control Valve.
STAR SPRINKLER INC.
2-4.1.10
Page 9
FIGURE 10
3 INCH (DN80) MODEL A PREACTION VALVE AND TRIM INSTALLATION DIMENSIONS
ELECTRIC/PNEUMATIC DOUBLE INTERLOCK PREACTION SYSTEM
10-1/4"
(260.4 mm)
6-1/8"
(155.6 mm)
17-7/8"
(454.0 mm)
16-3/4"
(425.5 mm)
26-3/8"
(669.9 mm)
12-1/8"
(308.0 mm)
MAIN
CONTROL
VALVE
DIFFERENTIAL
CHAMBER SUPPLY
(FIELD FABRICATED)
14-3/4" (374.7 mm)
WHEN MODEL S430
ACCELERATOR
IS USED
ADD
OBSOLETE
