TFP910
Page 5 of 20
to the Seat Ring. If the volume of the
air pockets is excessive, flow into the
system can be momentarily reduced
to nearly zero (once the air pockets
are compressed) and the Waterway
Clapper may close, causing flow to the
alarms to be shutoff.
After the Waterway Clapper has
closed, sufficient water must flow out
of the system before the Waterway
Clapper will again open. A repetition
of the above described condition is
termed an intermittent alarm.
Using a vent (which can also serve
as an end-of-line Inspector’s Test
Connection) piped from the top of a
cross main or end of a branch line at
the point most remote from the alarm
valve, and filling the system slowly in
accordance with the steps described in
the Setting Procedure section, can pre-
vent an excessive amount of air from
being trapped.
Installation
NOTICE
Proper operation of the TYCO Model
AV-1-300 Alarm Check Valves depends
upon the trim described in this data
sheet installed in accordance with the
following instructions. Failure to fol-
low the appropriate trim installation
instructions may prevent the device
from functioning properly as well as
void listings/approvals and the manu-
facturer’s warranties.
The Alarm Check Valves must be
installed in readily visible and acces-
sible locations.
It is recommended that provision be
made for viewing the alarm line drain
water by locating the main drain outlet
in a readily visible area.
Wet pipe fire protection systems must
be maintained at a minimum tempera-
ture of 40°F (4°C).
Step 1.
Trim the Alarm Check Valve in
accordance with Figure 4, 5, or 6, as
applicable. Apply pipe-thread sealant
sparingly to male threads only.
Step 2.
The Alarm Vent Trim illustrated
in Figure 8 must be installed if a water
motor alarm is not to be used.
Step 3.
Plug unused alarm
connections.
Step 4.
Suitable provision must be
made for disposal of alarm line and
system drainage water. Drainage
water must be directed so that it will
not cause damage or result in danger-
ous conditions.
Step 5.
The alarm line drain must be
arranged so that there will be no dan-
ger of freezing.
Step 6.
The check valve in the exter-
nally mounted bypass around the
Waterway Clapper must be installed
with its arrow pointed up, and the drain
check valve must be installed with its
arrow pointing towards the drain.
Step 7.
It is recommended that a vent
connection (which may also be used
as an end-of-line Inspector’s Test
Connection), be piped from a cross
main or branch line at the point most
remote from the alarm valve. The vent
line should be connected to the top of
a cross main or to the end of a branch
line and be located at the highest level
of a multi-level installation.
The vent connection can be used to
bleed-off excessive air from the sys-
tem, and therefore, minimize the
possibility of a false alarm due to a
transient surge in supply pressure. The
contraction/expansion associated with
an excessive amount of trapped air
could also cause the Waterway Clap-
per to cycle open and shut during an
inspector’s test or during a discharge
by a single sprinkler.
Setting
Procedure
Steps 1 through 11 are to be performed
when initially setting the Model AV-1-
300 Alarm Check Valve or after system
operation due to a fire.
NOTICE
Filling the system with water will result
in operation of the associated alarms.
Consequently, notification must first be
given to the owner and fire department,
central station, or other signal station to
which the alarms are connected.
Notify the proper authorities and all
personnel who may be affected that
an alarm test is to be performed.
After placing a fire protection system
in service, notify the proper authorities
and advise those responsible for moni-
toring proprietary and/or central station
alarms.
Step 1.
Open the 1/4 inch Gauge Test
Valves for the Supply and System Pres-
sure Gauges.
Step 2.
Check to see that the Hand-
hole Cover bolts are tight. If not,
cross-tighten them.
Step 3.
Close the Alarm Test Valve.
Step 4.
Open the remote cross main or
branch line vent connection. (Refer to
Step 7 in the Installation section.)
Step 5.
Slowly open the main control
valve until the sound of flowing water
just begins and then open the valve
one more turn.
Step 6.
Close the remote branchline
vent connection after the discharge of
aerated water ceases, and the outlet
has flowed full for at least 15 seconds.
Step 7.
Fully open the main control
valve.
Step 8.
Open the end-of-line Inspec-
tor’s Test Connection (or Alarm Test
Valve, if acceptable to the authority
having jurisdiction) and verify that the
system alarms operate.
Step 9.
Close the end-of-line Inspec-
tor’s Test Connection (or Alarm Test
Valve).
Step 10.
Verify that water ceases to
flow from the alarm line drain. If water
continues to flow, follow the corrective
procedure described in the Care and
Maintenance section.
The Restriction Assembly has a 1/8
inch (3,2 mm) diameter drain orifice.
Sufficient time must be allowed for
drainage of the Retard Chamber and
the piping to the water motor alarm.
Step 11.
After verification that the flow
of water out of the alarm line drain has
stopped, the alarm valve is set and is
ready for service.
