TFP1316
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 Inverted Flare 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.
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).
Dry Pilot Actuation
Operation Test Procedure
Proper operation of the DV-5
a
Valve,
such as opening of the DV-5
a
Valve as
during a fire condition, must be verified
as follows:
Step 1.
If water must be prevented
from flowing beyond the riser, perform
the following steps:
• Close System Main Control Valve (B).
Open Main Drain Valve (D).
• Open System Main Control Valve (B)
one turn beyond position at which
water just begins to flow from Main
Drain Valve (D).
• Slowly close the Main Drain Valve (D).
Step 2.
Open the Inspector’s Test
Connection.
Note:
Be prepared to quickly perform
Steps 3, 4, and 5 if water must be pre-
vented from flowing beyond the riser.
Step 3.
Verify that the DV-5
a
Valve has
tripped, as indicated by the flow of
water into the system.
Step 4.
Close the System Main Control
Valve (B).
Step 5.
Close the Diaphragm Supply
Valve (P).
Step 6.
Reset the DV-5
a
Valve in accor-
dance with the Valve Setting Procedure.
Low Pressure Alarm and
Condensate Drain for Dry Pilot
Actuation Test Procedures
For Dry Pilot Actuation, testing of the
Dry Pilot Low Pressure Switch (T) and
drainage of the pilot line condensate
must be performed as follows:
Step 1.
Close the System Main Control
Valve (B).
Step 2.
Close the Diaphragm Supply
Valve (P).
Step 3.
Open the Main Drain Valve (D).
Step 4.
Open the Inspector’s Test Con-
nection, and slowly relieve pneumatic
pressure. Verify that the Dry Pilot Low
Pressure Switch (T) is operational and
that the low pressure set points are as
follows:
• Low pressure alarm setting at
approximately 6 psi (0,4 bar) below
the minimum pilot line service pres-
sure requirement shown in Graph B
• Fire alarm setting at approximately
14.5 psi (1,0 bar) below the minimum
pilot line service pressure require-
ment shown in Graph B.
