TFP1466
Page 13 of 18
Care and
Maintenance
The following procedures and inspec-
tions must be performed as indicated,
in addition to any specific require-
ments of the NFPA and any applicable
standards recognized by the Approval
agency. Any impairment must be imme-
diately corrected. See Figure 8.
NOTICE
If the water supply needs to be shut off
to the DV-5
a
valve and trim and cannot
be shut off upstream of the system,
close the System Main Control Valve
(B), the Diaphragm Supply Valve (P),
and the Water Supply Shut-Off Valve
(R). This will allow any trim above the
System Main Control Valve (B) to be
taken apart for service if necessary.
The frequency at which the following
procedures and inspections are to be
performed are to be in accordance with
the NFPA and any applicable specific
requirements of the standards recog-
nized by the Approval agency.
Before closing a fire protection system
main control valve for maintenance
work on the fire protection system that
it controls, permission to shut down
the affected fire protection systems
must first be obtained from the proper
authorities and all personnel who may
be affected by this action must be
notified.
The owner is responsible for the
inspection, testing, and maintenance
of their fire protection system and
devices in compliance with this docu-
ment, as well as with the NFPA and any
applicable standards recognized by the
Approval agency. Contact the install-
ing contractor or product manufacturer
with any questions.
Some procedures in this section result
in the operation of the associated
alarms. Notify the owner and the fire
department, central station, or other
signal station to which the alarms are
connected before performing the tests.
It is recommended that automatic
sprinkler systems be inspected, tested,
and maintained by a qualified Inspec-
tion Service in accordance with the
NFPA and any applicable standards
recognized by the Approval agency.
It is recommended that the System
Inspection Procedure be performed
at least semi-annually by a quali-
fied Inspection Service. The Double
Interlock Preaction System Inspec-
tion Procedure may be followed in lieu
of performing any of the operational
tests recommended in the Technical
Data Sheets for the 24 VDC Solenoid
Valve and Model MC-1 Manual Control
Station.
It is recommended that the individuals
responsible for the care and mainte-
nance of the Double Interlock Preaction
System develop a working understand-
ing of the system, in general, prior to
performing inspection and/or mainte-
nance procedures. These instructions,
as well as individual instructions for
the solenoid valve, dry pilot actuator,
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 System.
Refer to the manufacturer’s instructions
and NFPA 25 for care and maintenance
procedures for all other devices (e.g.,
electric detection, main control and
system shut-off valves, supervisory
devices, sprinklers, etc.).
Before performing the System Inspec-
tion Procedure or Waterflow Alarm
Test Procedure, which will result in
operation of alarms, notify the proper
authorities and all personnel who may
be affected.
Drop in Water Supply Pressure
Below Normal Range
NOTICE
If the water supply pressure is signif-
icantly reduced below the normally
expected static pressure range (as
could occur in the case of a water main
break or repair), and there is a subse-
quent drop in the diaphragm chamber
water pressure below its normal range
(for example, due to a leak in a piping
connection to or from the diaphragm
chamber or, a leak in the diaphragm
chamber check valve caused by dirt or
debris in the check valve seal area), a
deluge valve such as the DV-5
a
could
inadvertently trip, if its water supply
pressure is quickly restored.
A drop in the water supply pressure
to below its normal range (as in the
case of an interrupted water supply
condition) constitutes an emergency
impairment.
Should this condition occur, immedi-
ately close the System Main Control
Valve (B) and use the following proce-
dure to reset the system:
Step 1.
Prior to the water supply pres-
sure being restored to the closed
System Main Control Valve (B), note the
pressure indicated by the Diaphragm
Gauge (K) and determine if the pres-
sure is within the normally expected
range.
Step 2.
If the diaphragm chamber pres-
sure is below the normal range, check
for and correct any source of leakage
from the diaphragm chamber prior to
resetting the system.
Step 3.
After the water supply pres-
sure is restored to the System Main
Control Valve (B), reset the DV-5
a
Valve
in accordance with the Valve Setting
Procedure section.
NOTICE
For fire protection systems subject to
an emergency impairment caused by
an interrupted water supply condition,
it is recommended that consideration
be given to installing a low water supply
pressure switch with the appropriate
alarm/indications to monitor the water
supply pressure.
Waterflow Alarm Test Procedure
To test the waterflow alarm, open the
Alarm Test Valve (G), which will allow a
flow of water to the Waterflow Pressure
Switch (C) and/or Water Motor Alarm.
Upon satisfactory completion of the
test, close the Alarm Test Valve (G).
To ensure drainage of the alarm line,
depress the plunger on the Automatic
Drain Valve (F).
