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TFP1462
After verifying the desired pressure
setting, tighten the jam nut.
Step 9. Suitable provision must be
made for disposal of drain water.
Drainage water must be directed such
that it will not cause damage or result
in dangerous conditions.
Step 10. All conduit and electrical con-
nections are to be made in accordance
with the requirements of the Authority
Having Jurisdiction and/or the National
Electrical Code.
In Case Of
Alarm
If a fire condition exist: Notify the
local fire service and follow the plan
prescribed by the Authority Having Ju-
risdiction.
If a fire condition does not exist:
Step 1. Close the Diaphragm Cham-
ber Supply Control Valve (Fig. 3) lo-
cated in the Diaphragm Chamber Sup-
ply Connections.
Step 2. Close the system's Main Con-
trol Valve (Fig. 1).
Step 3. Open the DV-3 Main Drain
Valve (Fig. 3).
Step 4. If the system has been
flooded, open the CV-2 System Main
Drain Valve (Fig. 3), Inspector's Test
Connection, and all auxiliary drains in
the system piping. Check to see that
the drainage water will not cause dam-
age or result in dangerous conditions.
Step 5. Notify the alarm monitoring
stations (if applicable) as well as the
Authority Having Jurisdiction that there
is an impairment to the fire protection
system.
Step 6. Determine if the false alarm
was caused by the electric fire detec-
tion system or a low air pressure con-
dition and then promptly correct the
impairment and return the fire protec-
tion system to service, as soon as pos-
sible.
System
Setting
Procedure
The Double Interlock Preaction Sys-
tem must be manually reset, and it
should be restored to service as soon
as possible; however, as the system is
being reset, the DV-3 Deluge Valve
and pressure Operated Relief Valve
will automatically reset.
NOTES
It is recommended that the individual
responsible for placing the Double In-
terlock Preaction System in service
develop a working understanding of
the system in general, prior to placing
it in operation. These instructions, as
well as individual instructions for the
deluge valve, swing check valve, dry
pilot actuator, solenoid valve, manual
control station, switches, and pressure
maintenance device should be re-
viewed.
After placing a fire protection system
in service, notify the proper authorities
and advise those responsible for moni-
toring proprietary and/or central sta-
tion alarms.
The procedure is as follows:
Step 1. Close the Diaphragm Cham-
ber Supply Control Valve (Fig. 3).
Step 2. Close the Double Interlock
System Main Control Valve (Fig. 1) and
the Air Supply Control Valve (Fig. 3).
Step 3. Open the System Main Drain
Valve at the side of the CV-2 Check
Valve (Fig. 3), Main Drain Valve adja-
cent to the DV-3 Deluge Valve (Fig. 3),
Inspector's Test Connection, and all
auxiliary drains in the system piping.
Check to see that the drainage water
will not cause damage or result in dan-
gerous conditions.
NOTE
Do not open the Inspector's Test Con-
nection and auxiliary drains if resetting
after a system test; otherwise, system
air pressure will be relieved unneces-
sarily.
Step 4. Operate (open) the Manual
Control Station (Fig. 3) to assure that
the DV-3 Valve Diaphragm Chamber is
vented.
Step 5. 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.
Step 6. Close the System Main Drain
Valve at the side of the CV-2 Check
Valve, Inspector's Test Connection,
Page 7 of 10
and all auxiliary drains in the system
piping. Leave the Main Drain Valve ad-
jacent to the DV-3 Deluge Valve open.
Step 7. Depress the plunger of the
Automatic Drain Valve (Fig. 3), to verify
that it is open and that the DV-3 Valve
has been completely drained.
Step 8. Clean out the Strainer (Fig. 3)
in the connection to the DV-3 Valve
Diaphragm Chamber.
Step 9. Close the Manual Control Sta-
tion (Fig. 3) by pushing the operating
lever up. Do not close the hinged cover
at this time.
Step 10. Replace all damaged or op-
erated sprinklers. Replacement sprin-
klers must be of the same type and
temperature rating as those which op-
erated.
NOTE
In order to prevent the possibility of a
subsequent operation of an over-
heated solder type sprinkler, any sol-
der type sprinklers which were possi-
bly exposed to a temperature greater
than their maximum rated ambient
must also be replaced.
Step 11. Service the air dryer, if appli-
cable, in accordance with the manu-
facturer's instructions.
Step 12. Open (energize) the Solenoid
Valve by manually operating the del-
uge valve releasing panel.
Step 13. Open the Diaphragm Cham-
ber Supply Control Valve (Fig. 3) and
allow water to discharge from the Dry
Pilot Actuator. Close the Diaphragm
Chamber Supply Control Valve when
air is no longer present in the dis-
charge from the Dry Pilot Actuator.
Step 14. If resetting after a test, fully
open the System Shut-Off Valve (Fig.
1), if applicable.
Step 15. Open the Air Supply Control
Valve (Fig. 3) and pressurize the sprin-
kler system in accordance with Graph
B.
Step 16. Return the Solenoid Valve to
its normally closed position by reset-
ting the deluge valve releasing panel.
Step 17. Fully open the Diaphragm
Chamber Supply Valve (Fig. 3) and
allow time for full pressure to build up
in the Diaphragm Chamber of the DV-3
Valve
Step 18. Operate (open) the Manual
Control Station (Fig. 3). SLOWLY close
the operating lever, by pushing it up,
after air is no longer present in the
discharge from the drain tubing. Close
the hinged cover and insert a new
break rod (PSN 92-289-1-008) in the
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