SETTING PROCEDURE
The Model A Preaction Valve will not automatically reset
after an operation. It must be manually reset and it should
be restored to service as soon as possible. Any impair-
ment to the system must be promptly corrected in order
to maintain the integrity of the system.
NOTES
It is recommended that the individual responsible for plac-
ing the Model A Preaction Valve in service develop an
overall understanding of the system, prior to placing it in
operation. These instructions, as well as individual in-
structions for the dry pilot actuator, solenoid valve, man-
ual control station, switches, accelerator (if applicable),
and pressure maintenance device should be reviewed.
After placing a fire protection system in service, notify the
proper authorities and advise those responsible for moni-
toring proprietary and/or central station alarms.
The setting procedure is as follows:
1. Close the System Main Control Valve (Fig. 1), Differen-
tial Chamber Supply Control Valve (Fig. 7), Air Supply
Control Valve (Fig. 7), and, if applicable, the Accelerator
Control Valve (Fig. 8).
2. Operate (open) the Manual Control Station (Fig. 7) to as-
sure that the Model A Preaction Valve Differential Cham-
ber is vented.
3. Open the Main Drain Valve (Fig. 7), Low Body Drain
Valve (Fig. 7), end-of-line Inspector’s Test Connection,
and all auxiliary drains in the system piping. Check to
see that the drainage water will not cause damage or re-
sult in dangerous conditions.
NOTE
Do not open the Inspector’s Test Connection and auxiliary
drains if resetting after a system test; otherwise, system air
pressure will be relieved unnecessarily.
4. Inspect for and clear all ice plugs, where system piping
has been exposed to freezing conditions and when
there has been a flow of water into the system.
5. After water ceases to drain, close the Inspector’s Test
Connection, all auxiliary drains in the system piping, and
the Low Body Drain Valve. Leave the Main Drain Valve
open.
6. Clean out the Strainer (16 - Fig. 6) in the connection to
the Model A Preaction Differential Chamber. Reassem-
ble the Strainer after cleaning.
7. Remove the Handhole Cover (4 - Fig. 2) and then care-
fully clean the Water Seat Disc, Air Seat Disc, Seat
Ring, and Clapper (22, 24, 3, 9 - Fig. 2). Verify that the
Retaining Lever (21 - Fig. 2), as well as the Differential
STAR SPRINKLER INC.
Page 8
2-4.1.10
FIGURE 8
OPTIONAL DOUBLE INTERLOCK
ACCELERATOR TRIM (#3644)
—MINIMUM 35 PSI WATER SUPPLY REQUIRED—
FIGURE 9
OPTIONAL PRIMING AND PRIMING TEST TRIM (#3022)
A14
ACCELERATOR
BLEED-OFF VALVE
(NORMALLY
CLOSED)
ACCELERATOR
CONTROL VALVE
(NORMALLY
ACCELERATOR
PRESSURE
GAUGE
1/2 INCH NPT
ACCELERATOR
CONNECTION
TO SYSTEM,
& INSTALL 1/2 INCH NPT
PLUGS IN ELBOWS
TO DRIP
FUNNEL
DISCARD THIS NIPPLE
TO DRIP
FUNNEL
A6
A14
A12
A4
A8
A13
A9
A11
A8
A9
A10
A3
A1
A13
A14
A7
A14
OPEN)
REFER TO
INSTALLATION
STEP 6
A2
A5
A15
PRIMING
VALVE
(NORMALLY
CLOSED)
TO DRIP
FUNNEL
PRIMING
CUP
PLUGS
DISCARD
TEST
VALVE
(NORMALLY
CLOSED)
PRIMING
P1
P8
P3
P9
P2
P4
P5
P8
P6
P7
NO. DESCRIPTION . . . QTY.
PART
A1
Accelerator,
Model S430 . . . . . .
1
#1306
A2
250 lb. Air Pressure
Gauge . . . . . . . . .
1
#923431012
A3
1/4" Gauge Test Valve
1
#460051002
A4
1/4" Globe Valve
. . .
1
#460471002
A5
1/2" Angle Valve
. . .
1
#460481004
A6
1/2" Swing Check Valve
with 3/32" Orifice . . .
1
#524031004
A7
1/2" Y-Strainer . . . . .
1
#523531005
A8
1/4" Tube Connector .
2
CH
A9
1/4" Tube, 36" Long . .
2
CH
A10 1/4" Plug . . . . . . . .
1
CH
A11 1/2" x 1/4" Bushing . .
1
CH
A12 1/2" x 1/4" x 1/2" Tee .
1
CH
A13 1/4" x 1-1/2" Nipple . .
2
CH
A14 1/2" x 1-1/2" Nipple . .
4
CH
A15 1/2" x 3" Nipple . . . .
1
CH
CH: Common Hardware
NO. DESCRIPTION . . . QTY.
PART
P1
Priming Cup . . . . . .
1
#923461004
P2
1/4" Globe Valve
. . .
1
#460471002
P3
1/2" Globe Valve
. . .
1
#460471004
P4
1/4" Tube Connector .
1
CH
P5
1/4" Tube, 36" Long . .
1
CH
P6
1/2" x 1/4" Reducing
Elbow
. . . . . . . . .
1
CH
P7
1/4" x 1-1/2" Nipple . .
1
CH
P8
1/2" x 1-1/2" Nipple . .
2
CH
P9
1/2" x 6" Nipple . . . .
1
CH
CH: Common Hardware
OBSOLETE
