16. If resetting after a test, fully open
the System Shut-Off Valve (Fig. A),
if applicable.
17. Open the Air Supply Control Valve
(Fig. C) and pressurize the sprink-
ler system in accordance with
Graph B.
18. Return the Solenoid Valve to its
normally closed position by reset-
ting the automatic control unit.
19. Fully open the Diaphragm Cham-
ber Supply Valve (Fig. D) and allow
time for full pressure to build up in
the Diaphragm Chamber of the
Multimatic Valve.
20. Operate (open) the Manual Control
Station (Fig. D). SLOWLY close
the operating lever, by pushing it
up, after air is no longer present in
the discharge from the drain tub-
ing. Close the hinged cover and
insert a new break rod (PSN 92-
289-1-008) in the small hole
through the top of the enclosing
box.
21. Inspect the drain connections from
the Dry Pilot Actuator and Manual
Control Station for leaks. Leaks, if
any, must be corrected before the
system is restored to service.
22. Reset the F311 Accelerator (Fig.
C) as follows, if the system is so
equipped; otherwise, proceed to
Step 23.
a. Close the Accelerator Control
Valve.
b. Slowly remove the plug from the
Strainer at the Accelerator inlet to
relieve any inlet pressure. This
procedure will trip the Accelerator
if it is not already tripped.
c. Clean out the Strainer at the Ac-
celerator inlet.
NOTE
A clogged strainer can prevent
the Accelerator from properly
tripping the system.
d. Open the Accelerator Bleed-off
Valve (Fig. C) and blow any resid-
ual water in the connection to the
system piping out through the
tube to the Drip Funnel. Close the
Bleed-off Valve after water
ceases to drain.
e. Open the Accelerator Control
Valve one-quarter turn and blow
any residual water in the connec-
tion to the system piping out
through the Strainer.
f. Close the Accelerator Control
Valve and replace the Strainer
Plug.
g. Slowly remove the Vent Plug lo-
cated in the front of the Accelera-
tor Cover and bleed off any resid-
ual pressure in the Accelerator
Differential Chamber.
h. Unscrew (counter-clockwise rota-
tion) the knurled Reset Knob at
the front of the Accelerator until it
resists further turning. A click,
which is the sound of the Lever
snapping back into the set posi-
tion, should be heard. Screw the
Reset Knob back in until it is finger
tight.
i.
i.
Replace the Vent Plug.
Verify that the system pressure
has returned to normal.
k. Using a watch, note the time for
the pressure in the Differential
Chamber of the Accelerator to in-
crease to 10 psi, after the Accel-
erator Control Valve is opened.
The time should be within the
range of values indicated below,
for optimum performance of the
Accelerator.
System Air
Pressure,
PSI
20
25
30
40
50
60
Time to 10 psi, sec.
Min. Max.
40 160
29 116
23 92
15 60
12 48
9 36
NOTE
Zf the time to pressurize the Dif-
ferential Chamber of the F311
Accelerator is not within the
range of values given in the
above table or any other resetting
problem is encountered, the Ac-
celerator Control Valve should
be closed and corrective action
taken (refer to TD109).
I. When the air pressure in the Dif-
ferential Chamber of the Acceler-
ator is equal to that in the system,
the Accelerator is set and ready
for service.
23. Slowly open the Main Control
Valve (Fig. A). Close the Main
Drain Valve at the rear of the F470
as soon as water discharges from
the drain connection. Observe the
Automatic Drain Valve for leaks. If
there are leaks, either the Clapper
is not properly seated and the Dou-
ble Interlock Preaction System
must be reset, or there is internal
leakage past the Clapper Facing or
Diaphragm. Determine/correct the
cause of the leakage problem. If
there are no leaks, fully open the
Main Control Valve (Fig. A).
24. Verify that the deluge valve releas-
-9-
ing panel is returned to a normal
standby condition.
25. It is recommended that the Main
Control Valve and the System
Shut-Off Valve (if applicable) be
locked in the full open position if
they are not monitored by supervi-
sory switches.
NOTE
After placing a fire protection sys-
tem in service, notify the proper
authorities and advise those re-
sponsible for monitoring propri-
etary and/or central station
alarms.
The Double Interlock Preaction Sys-
tem is now set for service.
The Double Interlock Preaction Sys-
tem requires regularly scheduled care
and maintenance of its principle com-
ponents, as described in their individ-
ual technical data sheets. In addition,
it is recommended that the proper op-
eration and condition of the system be
periodically verified in accordance with
the following described inspection pro-
cedure.
Any impairment to the system must be
promptly corrected in order to maintain
the integrity of the system.
It is recommended that the System
Inspection Procedure be performed at
least semi-annually by a qualified In-
spection Service. The Double Interlock
Preaction System Inspection Proce-
dure may be followed in lieu of per-
forming any of the operational tests
recommended in the Technical Data
Sheets for the Model F470 Deluge
Valve, Model F52OIF5201 Swing
Check Valve, Model B-1 Dry Pilot Ac-
tuator, 24 VDC Solenoid Valve, Mod-
els PSlO-2A and PS40-1A Pressure
Switches, and Model F180 Manual
Control Station.
NOTES
1. It is recommended that individu-
als responsible for care and main-
tenance of the Double Interlock
Preaction System develop a work-
ing understanding of the system,
in general, prior to performing in-
spection andlor maintenance
procedures. These instructions,
as well as individual instructions
for the deluge valve, swing check
valve, dry pilot actuator, solenoid
valve, manual control station,
switches, accelerator (if applica-
ble), and pressure maintenance
device should be reviewed.
2. The following procedures pertain
to the automatic control valve
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