Care And Maintenance - Tyco DV-5A Manual

TFP1421
Page 14 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 valve and trim and cannot
a
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
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
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).
Supervisory Low Pressure Alarm
Test Procedure
Proper operation of the Supervisory
Low Pressure Switch (U) must be per-
formed as follows:
Step 1. Open the System Drain Valve
(E) just enough to slowly relieve super-
visory air pressure from the system.
Verify that the Supervisory Low Pres-
sure Switch (U) is operational and that
the low pressure set point is approxi-
mately 5 psi (0,34 bar).
Step 2. Close the System Drain Valve
(E) and allow the system supervisory
pressure of 10 ± 2 psi (0,69 ± 0,14 bar)
to be automatically re-established. The
could
a
Supervisory Low Pressure Switch (U)
should return to its normal condition.
Pressure Relief Valve Maintenance
Over pressurization of the system
piping with air will result in the opening
of the Supervisory Air Pressure Relief
Valve (T). If the Supervisory Air Pres-
sure Relief Valve (T) continues to bleed
air after the system pressure has been
reduced to its normal supervisory pres-
sure range of 10 ± 2 psi (0,69 ± 0,14 bar),
most likely debris became lodged in the
seating area. To help clean the seating
area, slowly pull up on the ring at the
top of the Supervisory Air Pressure
Relief Valve (T) to allow a full flow of air
through the Supervisory Air Pressure
Relief Valve (T), and then release the
ring to allow the Supervisory Air Pres-
sure Relief Valve (T) to snap closed.
Repeat the cleaning procedure as
necessary.
Electric Actuation Solenoid Valve
Test Procedure
Proper operation of the Solenoid Valve
(V) for electric actuation must be veri-
fied at as follows:
Valve
a
Step 1. Close the System Main Control
Valve (B).
Step 2. Open the Main Drain Valve (D).
Step 3. Test the deluge releasing panel
in accordance with the manufacturer's
instructions to energize the solenoid
valve.
Step 4. Verify that there is a flow of
water from the Solenoid Valve drain
connection.
Step 5. Verify that the Diaphragm
Chamber pressure has decreased
to below 25% of the water supply
pressure.