portion of the Double Interlock
Preaction System. Refer to the
manufacturer’s instructions and
NFPA 25 for care and mainte-
nance procedures for all other de-
vices (e.g., electric detection, main
control and system shut-off
valves, supervisory devices,
sprinklers, etc.).
3. Before performing the System Zn-
spection Procedure, which will re-
sult in operation of alarms, notify
theproperauthorities and allper-
sonnel who may be affected.
4. Before closing a fire protection
system main control valve for
maintenance work on the firepro-
tection system which it controls,
permission to shut down the af-
fected fire protection system must
be obtained from the proper au-
thorities and all personnel who
may be affected by this action
must be notified.
System inspection Procedure
1. Close the Main Control Valve (Fig.
A) and then open the Main Drain
Valve at the rear of the F470 (Fig.
W
2. Open (energize) the Solenoid
Valve by manually operating the
automatic control unit. Verify that
there is no leakage out the Dry
Pilot Actuator drain. Also, verify full
operation of the deluge valve re-
leasing panel and its associated
alarms.
NOTES
During this procedure, the Sole-
noid Valve is opened; however, the
Dry Pilot Actuator should remain
closed and the F470 Deluge Valve
Diaphragm Chamber should re-
main pressurized.
This procedure is used to verify
that the F470 Deluge Valve will
remain set if the ele:tric detection
system operates but the sprinkler
system remains in its normally
pressurized condition.
3. Open the Inspector’s Test Connec-
tion but be prepared to close it, as
well as the Accelerator Control
Valve (Fig. C), if applicable, im-
mediately after verifying the follow-
ing:
a. If the system is equipped with an
Accelerator, verify that the time to
Accelerator trip is essentially the
same as in previous tests, and
verify that the Diaphragm Cham-
ber Pressure Gauge (Fig. D) de-
creases to a pressure below 25%
of the water supply pressure.
b. Verify that the Low Pressure
Alarm Switch (Fig. C) and its as-
sociated alarms operate properly.
The Low Pressure Alarm Switch
should operate at the previously
established pressure (refer to In-
stallation section, Step 10).
Close the Inspector’s Test Con-
nection, and, if applicable, close
the Accelerator Control Valve.
4. Close the Diaphragm Chamber
Supply Control Valve (Fig. D).
5. Close the System Shut-off Valve
(Fig. A) after the system air pres-
sure has been restored to normal.
6. Manually restore the electric fire
detection system to a normal con-
dition in accordance with the
manufacturer’s instructions. The
Solenoid Valve will then be de-en-
ergized and returned to its nor-
mally closed position.
7. Open the Diaphragm Chamber
Supply Control Valve.
8. Open the Main Control Valve (Fig.
A) one turn beyond the position at
which water just begins to flow
from the Main Drain Valve at the
rear of the F470.
9. Close the Main Drain Valve at the
rear of the F470 (Fig. D).
10. Close the Air Supply Control Valve
(Fig. C).
11. Open the Dry Pilot Actuator by par-
tially opening the System Main
Drain Valve (Fig. C) to relieve air
pressure at the inlet to the Actua-
tor. Verify that there is no leakage
out the Dry Pilot Actuator.
NOTES
During this procedure, the Dry
Pilot Actuator is opened; however,
the Solenoid Valve should remain
closed and the F470 Deluge Valve
Diaphragm Chamber should re-
main pressurized.
This procedure is used to verify
that the F470 Deluge Valve will
remain set if the Dry Pilot Actua-
tor operates due to loss of system
air pressure and the electric detec-
tion system remains in a normal
condition.
12. Open (energize) the Solenoid
Valve by operating the deluge
valve releasing panel, and verify
the following:
a. Verify that the F470 Deluge Valve
operates, as is indicated by a dis-
charge of water from the System
Main Drain Valve and the Auto-
matic Drain Valve. The Automatic
Drain Valve may or may not close
depending on the amount of flow
past the partially open Main Con-
trol Valve.
b. Verify that the Water-flow Pres-
sure Alarm Switch (Fig. C) and its
associated alarms properly oper-
ate.
c. Verify that the Water Motor Alarm,
if applicable, properly operates.
NOTE
This procedure simulates opening
of both the Dry Pilot Actuator (loss
of system air pressure) and Sole-
noid Valve (operation of the auto-
matic control unit) to verify auto-
matic system operation.
13. Reset the Double Interlock Dry
System in accordance with the Re-
setting Procedure section.
Seller warrants for a period of one year
from the date of shipment (warranty
period) that the products furnished
hereunder will be free from defects in
material and workmanship.
For further details on Warranty, see
Price List.
All orders must include the description
and Product Symbol Number (PSN).
NOTES
Heat detection equipment and signal-
ling devices must be separately or-
dered.
To attach the lower flange of the F520
or F5201 Check Valve to the upper
flange of the F470 Deluge Valve, as
shown in Figure B, at least four out of
the eight required flange fasteners
must be stud bolts and nuts. The stud
bolts, which are to be separately or-
dered, must be 5/8”-1lUNC x 3-l/4”
long for 4 inch (100 mm) valves and
3/4”-IOUNC x 3-314” long for 6 inch
(150 mm) valves.
Use of an automatic pressure mainte-
nance device is recommended. Refer
to Table A.
When ordering the 4 or 6 inch (100 or
150 mm) Double Interlock Preaction
System, ‘the following items selected
-lO-
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