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Page 8 of 10
small hole through the top of the en-
closing box
Step 19. Inspect the drain connections
from the Dry Pilot Actuator, Manual
Control Station, and Pressure Oper-
ated Relief Valve for leaks. Leaks, if
any, must be corrected before the sys-
tem is restored to service.
Step 20. Slowly open the Main Control
Valve (Fig. 1). Close the Main Drain
Valve adjacent to the DV-3 Deluge
Valve as soon as water discharges
from the drain connection. Observe the
Automatic Drain Valve for leaks. If
there are leaks, either the Center Valve
is not properly seated and the Double
Interlock Preaction System must be
reset, or there is internal leakage past
the Center Valve Facing or Diaphragm.
Determine/correct the cause of the
leakage problem. If there are no leaks,
fully open the Main Control Valve (Fig.
1).
Step 21. Verify that the deluge valve
releasing panel is returned to a normal
standby condition.
Step 22. 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 supervisory switches.
NOTE
After placing a fire protection system
in service, notify the proper authorities
and advise those responsible .for
monitoring proprietary and/or central
station alarms.
The Double Interlock Preaction Sys-
tem is now set for service.
Care and
Maintenance
The following inspection must be per-
formed as indicated, in addition to any
specific requirements of the NFPA,
and any impairment must be immedi-
ately corrected. It is recommended
that the System Inspection Procedure
be performed at least semi-annually.
The owner is responsible for the in-
spection, testing, and maintenance of
their fire protection system and de-
vices in compliance with this docu-
ment, as well as with the applicable
standards of the National Fire Protec-
tion Association (e.g., NFPA 25), in
addition to the standards of any
authority having jurisdiction. The in-
stalling contractor or product manufac-
turer should be contacted relative to
any questions.
It is recommended that automatic
sprinkler systems be inspected,
tested, and maintained by a qualified
Inspection Service in accordance with
local requirements and/or national
codes.
NOTES
It is recommended that the individuals
responsible for the care and mainte-
nance of the Double Interlock Preac-
tion System develop a working under-
standing of the system, in general,
prior to performing inspection and/or
maintenance procedures. These in-
structions, as well as individual in-
structions for the deluge valve, swing
check valve, dry pilot actuator , sole-
noid valve, manual control station,
switches, and pressure maintenance
device should be reviewed.
The following procedures pertain to
the automatic control valve portion of
the Double Interlock Preaction Sys-
tem. Refer to the manufacturer's in-
structions and NFPA 25 for care and
maintenance procedures for all other
devices (e.g., electric detection, main
control and system shut-off valves, su-
pervisory devices, sprinklers, etc.).
Before performing the System Inspec-
tion Procedure, which will result in op-
eration of alarms, notify the proper
authorities and all personnel who may
be affected.
Before closing a fire protection system
main control valve for maintenance
work on the fire protection system
which it controls, permission to shut
down the affected fire protection sys-
tem must be obtained from the proper
authorities and all personnel who may
be affected by this action must be no-
tified.
System Inspection Procedure
Step 1. Close the Main Control Valve
(Fig. 1) and then open the Main Drain
Valve adjacent to the DV-3 Deluge
valve (Fig. 3).
Step 2. Open (energize) the Solenoid
Valve by manually operating the auto-
matic control unit. Verify that there is
no leakage out the Dry Pilot Actuator
drain. Also, verify full operation of the
deluge valve releasing panel and its
associated alarms.
NOTES
During this procedure, the Solenoid
Valve is opened; however, the Dry Pi-
lot Actuator should remain closed and
the DV-3 Deluge Valve Diaphragm
Chamber should remain pressurized.
This procedure is used to verify that
the DV-3 Deluge Valve will remain set
if the electric detection system oper-
ates but the sprinkler system remains
in its normally pressurized condition.
Step 3. Open the Inspector's Test Con-
nection but be prepared to close it im-
mediately after verifying that the Low
Pressure Alarm Switch (Fig. 3) and its
associated alarms operate properly.
The Low Pressure Alarm Switch
should operate at the previously estab-
lished pressure (refer to Installation
section, Step 7).
Close the Inspector's Test Connection.
Step 4. Close the Diaphragm Cham-
ber Supply Control Valve (Fig. 3).
Step 5. Close the System Shut-off
Valve (Fig. 1) after the system air pres-
sure has been restored to normal.
Step 6. Manually restore the electric
fire detection system to a normal con-
dition in accordance with the manufac-
turer's instructions. The Solenoid Valve
will then be de-energized and returned
to its normally closed position.
Step 7. Open the Diaphragm Chamber
Supply Control Valve.
Step 8. Open the Main Control Valve
(Fig. 1) one turn beyond the position at
which water just begins to flow from
the Main Drain Valve adjacent to the
DV-3 Deluge Valve.
Step 9. Close the Main Drain Valve
adjacent to the DV-3 Deluge valve (Fig.
3).
Step 10. Close the Air Supply Control
Valve (Fig. 3).
Step 11. Open the Dry Pilot Actuator
by partially opening the System Main
Drain Valve (Fig. 3) to relieve air pres-
sure at the inlet to the Actuator. Verify
that there is no leakage out the Dry
Pilot Actuator.
TFP1462
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