Tyco Star Hydrus S30 User manual

Hydrus™ Alarm Check Valves,
S30(GroovexGroove)
S3001(FlangexGroove)
GENERAL DESCRIPTION
The Star Hydrus S30/S3001 Alarm Check Valves are di-
vided seat ring, rubber faced clapper, waterflow alarm
check valves which are intended for use in wet pipe (auto-
matic sprinkler) fire protection systems. They are de-
signed to automatically actuate electric and/or hydraulic
alarms when there is a steady flow of water into the sys-
tem which is equivalent to the discharge rate of one or
more sprinklers.
The Star Hydrus Alarm Check Valves are designed for
vertical installations.Flanged connections are per ANSI
Standard B16.1.Grooved connections are suitable for
use with grooved end couplings that are listed or ap-
proved for fire protection service.
A separately ordered, Star Model S310 Retard Chamber
is required for installations subject to variable pressures.
It is used to help prevent false alarms associated with
variable pressure public water supplies.
The Star Alarm Check Valve Trim includes pressure
gauges to monitor system pressure conditions, a by-pass
check valve, a main drain valve, an alarm control valve,
and an alarm test valve. The bypass check valve serves
to reduce the possibility of false alarms by permitting
slow as well as small transient increases in water supply
pressure to be passed through to the system without
opening of the waterway clapper.
WARNING
The Hydrus S30/S3001 Alarm Check Valves described
herein must be installed and maintained in compliance
with this document, as well as with the applicable stand-
ards of any authorities having jurisdiction. Failure to do
so may impair the integrity of these devices.
The owner is responsible for maintaining his fire protec-
tion system and devices in proper operating condition.
The installing contractor or sprinkler manufacturer should
be contacted relative to any questions.
TECHNICAL DATA
Approvals
UL and ULC Listed.FM Approved.
Working Water Pressure Range
20 to 175 psi (1.4 to 12.1 bar).
Friction Loss
RefertoFigure2.
Physical Characteristics
The body and handhole cover are cast iron, the seat ring
is bronze, and the clapper is stainless steel with an
EPDM clapper facing.
OPERATION
When the fire protection system is initially being pressur-
ized, water will flow into the system until the water supply
and system pressure become equalized and the torsion
Spring closes the Clapper.Once the pressures have stabi-
lized, the Alarm Check Valve is ready to be placed in serv-
ice and the Alarm Control Valve must be opened.
In the case of variable pressure systems, slow as well as
small transient increases in water supply pressure may
continue to be built up in the system (via the bypass
check valve) without opening the Clapper. A transient
surge in supply pressure which is sufficient to only mo-
mentarily open the Clapper will not cause a false alarm,
and a portion of the increase in pressure will be trapped
within the system, thus reducing the possibility of another
opening. Any water in the alarm line is automatically
drained, which helps to further reduce the possibility of a
false alarm due to a successive transient surge in supply
pressure.
When there is a steady flow of water into the sprinkler
system due to an alarm test, a sprinkler operation, or a
sustained surge in supply pressure which is sufficient to
maintain the Clapper open, the water motor alarm and/or
the pressure alarm switch will be actuated.The alarms
will continue to be actuated as long as the Clapper re-
mains opened.They may be silenced by closing the
Alarm Control Valve.Water in the alarm lines will automat-
ically drain out through the 1/8" (3.2 mm) drain orifice in
the Restriction Assembly (Figure 4) once the Alarm Con-
trol Valve is shut or the waterway Clapper closes (due to
414-570-5000 • 800-558-5236 • FAX [phone]
2-1.1.30
STAR SPRINKLER INC.
E-mail [e-mail]
S30
2-1/2 Inch: #4915
S3001
2-1/2 Inch: #4910
OBSOLETE

a discontinuation in the flow of water into the sprinkler
system).
NOTE
The Alarm Check Valve does not have to be re-set after
an operation. However, if the alarms were silenced dur-
ing operation, the Alarm Control Valve must be re-
opened after the fire protection system is restored to serv-
ice.
DESIGN CRITERIA
In planning the installation, consideration must be given
to the disposal of the large quantities of water which may
be associated with the draining the system or performing
a flow test.
The sprinkler system designer must be aware that the
configuration of the piping network and its tendency to
trap pockets of air (such as in the case of a peaked-roof
gridded system) can affect the performance of the alarm
system. Although a slight amount of trapped air is desir-
able to prevent significant pressure increases due to ther-
mally induced expansion of the water, a large quantity of
trapped air in a system may result in the possibility of an
intermittent alarm.
The possibility of an intermittent alarm condition is a con-
sequence of the fact that the flow out of the system
through the test valve or a single sprinkler is very small
relative to the flow which can be passed through the
valve. This difference increases with valve size.If there
was no trapped air within the system, flow in would equal
flow out and the waterway Clapper would always stabilize
at some open position (as needed to accommodate the
required flow).With trapped air in the system, however,
the waterway Clapper first opens wider since the system
initially demands greater flow until the air pockets are
compressed (back to nearly the supply pressure) and
then it will tend to return closer to the Seat Ring. If the vol-
ume of the air pockets are 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.
Once the Clapper has closed, sufficient water must flow
out of the system before the 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 In-
spector’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 ac-
cordance with the steps described in the Setting Proce-
dure section, can prevent an excessive amount of air
from being trapped.
STAR SPRINKLER INC.
Page 2 2-1.1.30
FIGURE 1
HYDRUS S30/S3001
ALARM CHECK VALVES
(S3001 Flange x Groove Shown)
NO. DESCRIPTION .... QTY.PART
1 ValveBody....... 1 NR
2 Handhole Cover . . . 1 923001212
3 Handhole Cover Gasket 1 922001213
4 SeatRing ....... 1 NR
5 Clapper ........ 1 922001223
6 Clapper Facing .... 1 922001203
7 Clapper Washer .... 1 922001205
8 LockNut........ 1 925141420
9 HingePin ....... 1 922001214
10 Bushing ........ 2 NR
11 Spring ......... 1 922001215
12 CapScrew....... 4 626341108
NR: Not Replaceable
OBSOLETE

INSTALLATION
The Hydrus S30/S3001 Alarm Check Valves must be in-
stalled in accordance with the following instructions:
NOTES
Proper operation of the Alarm Check Valves depends
upon the trim described in this data sheet being installed
in accordance with the following instructions. Failure to fol-
low the appropriate trim installation instructions may pre-
vent the device from functioning properly as well as void
Listings/Approvals, and the manufacturer’s warranties.
The Alarm Check Valves must be installed in readily vis-
ible and accessible locations.
It is recommended that provision be made for viewing of
the alarm line drain water by locating the main drain out-
let in a readily visible area.
Wet pipe fire protection systems must be maintained at a
minimum temperature of 40°F/4°C.
1. Tighten all flange mounting fasteners uniformly, using a
cross-draw sequence. The required torque for 2-1/2 inch
flange fasteners is 40 to 50 ft.lbs. (54 to 68 Nm).
2. Trim the Alarm Check Valve in accordance with Figure 5
or 6, as applicable. Apply pipe thread sealant sparingly
to male threads only.
3. The Alarm Vent Trim illustrated in Figure 7 must be in-
stalled if a water motor alarm is not to be used.
4. Plug unused alarm connections.
5. Suitable provision must be made for disposal of alarm
line and system drainage water. Drainage water must
be directed such that it will not cause damage or result
in dangerous conditions.
6. The alarm line drain must be arranged so that there will
be no danger of freezing.
7. The check valve in the externally mounted bypass
around the waterway Clapper must be installed with its
arrow pointed up and the drain check valve must be in-
stalled with its arrow pointing towards the drain.
8. It is recommended that a vent connection (which may
also be used as an end-of-line Inspector’s Test Connec-
tion), 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 excessive air
from the system and, therefore, minimize the possibility
of a false alarm due to a transient surge in supply pres-
sure. The contraction/expansion associated with an ex-
cessive amount of trapped air could also cause the wa-
terway Clapper to cycle open and shut during an
inspector’s test or during a discharge by a single sprin-
kler.
STAR SPRINKLER INC.
2-1.1.30 Page 3
FIGURE 3
PRESSURE AT THE
WATER MOTOR ALARM CONNECTION
FIGURE 4
RESTRICTION ASSEMBLY
NOMINAL PRESSURE DROP IN POUNDS PER SQUARE INCH (PSI)
FLOW RATE IN U.S. GALLONS PER MINUTE (GPM)
4
1100
2
3
200 300
9
6
5
8
7
10
400 500
2-1/2" VALVES
INLET RESTRTICTION
WITH 0.219" (5.6 mm)
DRAIN RESTRTICTION
WITH 0.125" (3.2 mm)
O
RIFI
C
E
ORIFICE
SC
REEN
FIGURE 2
NOMINAL PRESSURE LOSS VERSUS FLOW
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STAR SPRINKLER INC.
Page 4 2-1.1.30
FIGURE 5
VERTICAL CLOSED DRAIN TRIM FOR 2-1/2 INCH ALARM CHECK VALVES
NO. DESCRIPTION . . . QTY. PART NO.
1 300 psi/ 2000 kPa
Water Pressure
Gauge ......... 2 923001003
2 1/4" Gauge Test
Valve.......... 2 460051002
3 1/2" Swing Check
Valve.......... 2 460491004
4 1/2"GlobeValve.... 1 460471004
5 1/2"BallValve..... 1 923001002
6 1/2"Y-Strainer..... 1 523531005
7 Restriction Assembly . 1 922101005
8 1-1/4" Angle Valve . . . 1 460481007
9 1/2" NPT x 1/2"
Tube Connector .... 2 CH
10 1/2" NPT x 5/8"
Tube Connector .... 2 CH
11 External By Pass Tube 1 923041017
12 AlarmTestTube.... 1 923041047
13 1/4"Plug........ 2 CH
14 1/4"90°Elbow..... 1 CH
15 1/2"Tee ........ 2 CH
16 1/2" x 1/4" x 1/2" Tee . 2 CH
17 1/2" x 1/2" x 3/4" Tee . 1 CH
18 1/2" 90° Union Elbow . 1 CH
19 1-1/4" x 1-1/4 x 1/2"
Tee........... 1 CH
20 1/4"x1"Nipple .... 2 CH
21 1/4" x 2-1/2" Nipple . . 1 CH
22 1/2" x 1-1/2" Nipple . . 6 CH
23 1/2"x2"Nipple .... 3 CH
24 1/2" x 2-1/2" Nipple . . 2 CH
25 1/2"x3"Nipple .... 1 CH
26 1/2"x4"Nipple .... 1 CH
27 1-1/4" x 2-1/2" Nipple . 1 CH
28 1-1/4" x 4-1/2" Nipple . 1 CH
NOTES
CH: Common Hardware
The nipples are Schedule 40 steel per ASTM A53
or A135. The fittings are either malleable iron
per ANSI B16.3 or cast iron per ANSI B16.4.
All threaded connections are NPT per ANSI
B1.20.1.
DIMENSIONS IN INCHES AND (mm)
W/ S310 W/O S310
A14-3/4 (375) 12 (305)
B10-1/2 (267) 10-1/2 (267)
C10-1/2 (267) 10 (254)
D* 8-7/8 (225) 8-7/8 (225)
E12-1/4 (311) 12-1/4 (311)
F16-1/2 (419) N/A
G4 (102) 4 (102)
* S20 & S3001
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STAR SPRINKLER INC.
2-1.1.30 Page 5
FIGURE 6
VERTICAL OPEN DRAIN TRIM FOR 2-1/2 INCH ALARM CHECK VALVES
NO. DESCRIPTION . . . QTY. PART NO.
1 300 psi/ 2000 kPa
Water Pressure
Gauge ..........2 923001003
2 1/4" Gauge Test
Valve...........2 460051002
3 1/2" Swing Check
Valve...........1 460491004
4 1/2"GlobeValve ....1 460471004
5 1/2"BallValve......1 923001002
6 1/2"Y-Strainer .....1 523531005
7 Restriction Assembly . . 1 922101005
8 1-1/4" Angle Valve . . . 1 460481007
9 1/2" NPT x 1/2"
Tube Connector .....2 CH
10 1/2" NPT x 5/8"
Tube Connector .....2 CH
11 External By Pass Tube . 1 923041017
12 AlarmTestTube ....1 923041047
13 Support Bar .......1 923431014
14 JamNut.........1 926401037
15 PVCNipple .......1 926401009
16 Support Bracket .....1 923431006
17 Drip Funnel .......1 923431007
18 1/4"Plug.........2 CH
19 1/4"90°Elbow .....1 CH
20 1/2"Tee.........2 CH
21 1/2" x 1/4" x 1/2" Tee . . 2 CH
22 1/2" x 1/2" x 3/4" Tee . . 1 CH
23 1-1/4" x 1-1/4 x 1/2"
Tee ...........2 CH
24 1/4"x1"Nipple .....2 CH
25 1/4" x 2-1/2" Nipple . . . 1 CH
26 1/2" x 1-1/2" Nipple . . . 5 CH
27 1/2"x2"Nipple .....2 CH
28 1/2" x 2-1/2" Nipple . . . 1 CH
29 1/2"x3"Nipple .....1 CH
30 1/2"x4"Nipple .....1 CH
31 1-1/4" x 2-1/2" Nipple . . 2 CH
32 1-1/4" x 8-1/2" Nipple . . 1 CH
NOTES
CH: Common Hardware
The nipples are Schedule 40 steel per ASTM A53
or A135. The fittings are either malleable iron
per ANSI B16.3 or cast iron per ANSI B16.4.
All threaded connections are NPT per ANSI
B1.20.1.
DIMENSIONS IN INCHES AND (mm)
W/ S310 W/O S310
A14-3/4 (375) 12 (305)
B10-1/2 (267) 10-1/2 (267)
C10-1/2 (267) 10 (254)
D* 8-7/8 (225) 8-7/8 (225)
E12-1/4 (311) 12-1/4 (311)
F16-1/2 (419) N/A
G8 (203) 8 (203)
* S20 & S3001
OBSOLETE

SETTING PROCEDURE
Steps 1 through 12 are to be performed when initially set-
ting the Hydrus S30/S3001 Alarm Check Valves or after
system operation due to a fire.
1. Open the 1/4 inch Gauge Test Valves for the Supply
and System Pressure Gauges.
2. Check to see that the Handhole Cover bolts are tight. If
not, cross-tighten them.
3. Close the Alarm Control Valve and the Alarm Test Valve.
4. Open the remote cross main or branch line vent connec-
tion (Ref. Step 8 in the Installation section).
5. Slowly open the main control valve until the sound of
flowing water just begins and then open the valve one
more turn.
6. Close the remote branch line vent connection after the
discharge of aerated water ceases and the outlet has
flowed full for at least 15 seconds.
7. Fully open the main control valve.
8. After the Supply and System Pressure Gauge readings
have stabilized (i.e., the waterway Clapper has closed),
open the Alarm Control Valve.
9. Open the end-of-line Inspector’s Test Connection (or
Alarm Test Valve, if acceptable to the authority having
jurisdiction) and verify that the system alarms operate in
accordance with the requirements of the authority hav-
ing jurisdiction.
NOTE
Notify the proper authorities and all personnel who may be
affected that an alarm test is to be performed.
10. Close the the end-of-line Inspector’s Test Connection
(or Alarm Test Valve).
11. Verify that water ceases to flow from the alarm line
drain. If water continues to flow, follow the corrective pro-
cedure described in the Maintenance and Service sec-
tion.
NOTE
TheRestrictionAssemblyhasa1/8"(3.2mm)diameterdrain
orifice. Sufficient time must be allowed for drainage of the
Retard Chamber and the piping to the water motor alarm.
12. Once it has been verified that the flow of water out of the
alarm line drain has stopped, the alarm valve is set and
is ready for service.
It is recommended that the Alarm Control Valve be wire
sealed in the open position with a No. 16 twisted wire,
the ends of which are secured by a lead seal. The wire
seal should be looped through the large hole in the han-
dle and be tightly twisted around the pipe nipple at the
outlet of the Alarm Control Valve.
NOTE
After placing a fire protection system in service, notify the
proper authorities and advise those responsible for monitor-
ing proprietary and/or central station alarms.
MAINTENANCE AND SERVICE
The Hydrus S30/S3001 Alarm Check Valves do not re-
quire any regularly scheduled maintenance. It is recom-
mended, however, that proper operation of the alarms be
periodically verified in accordance with a procedure
which is acceptable to the Authority Having Jurisdiction
(AHJ). Any impairment must be immediately corrected.
NOTES
Before closing a fire protection system main control valve
for maintenance work on the fire protection systems
which 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 decision must be notified.
If the alarms are silenced during operation, the Alarm
Control Valve must be re-opened immediately after the
fire protection system is restored to service. It is recom-
mended that the Alarm Control Valve be wire sealed in
the open position as described in Step 12 of the Setting
Procedure section.
Inspection Procedure
It is recommended that the following inspection proce-
dure be performed at least quarterly by a qualified Inspec-
tion Service:
1. Notify the proper authorities and all personnel who may
be affected that an alarm test is to be performed.
2. Open the end-of-line Inspector’s Test Connection (or
Alarm Test Valve, if acceptable to the authority having
jurisdiction) and verify that the system alarms operate in
accordance with the requirements of the authority hav-
ing jurisdiction. Verify that the water motor alarm and/or
the pressure alarm switch properly actuate and within
the elapsed time required by the authority having juris-
diction.
3. Verify that water is flowing from out of the alarm line
drain at a rate consistent with the 1/8" (3.2 mm) diame-
ter drain orifice in the Restriction Assembly.
4. Close the end-of-line Inspector’s Test Connection (or
Alarm Test Valve).
5. Verify that water ceases to flow from the alarm line drain.
6. Clean the 1/2 inch Strainer (located at the outlet of the
Alarm Control Valve) as well as the 3/4 inch Strainer (lo-
cated at the connection to the water motor alarm, as ap-
plicable). Be sure to replace the strainer baskets and
tighten the caps securely.
NOTE
Cleaning of the Strainers after each operation of the alarms
is especially important in the case of water supplies (such as
lakesandrivers)havingalargequantityofsuspendedmatter.
A clogged alarm line can prevent operation of the alarms.
7. Notify all authorities responsible for monitoring the instal-
lation that the fire protection system has been returned
to service.
Sprinkler System Drain-Down
Draining down of the sprinkler system must be done in ac-
cordance with the following procedure:
1. Close the main control valve, if this has not already
been done.
2. Open the remote cross main or branch line vent connec-
tion (Ref. Step 8 in the Installation section).
STAR SPRINKLER INC.
Page 6 2-1.1.30
OBSOLETE

3. Open the Main Drain Valve. Check to see that the drain-
age water will not cause damage or result in dangerous
conditions.
4. Wait until the Supply Pressure Gauge reads zero pres-
sure and the sound of draining water has stopped be-
fore performing any maintenance work on the fire protec-
tion system.
Leakage from Alarm Line Drain
Follow the steps indicated below until water ceases to
flow from the alarm line drain. Check for the discontinu-
ation of the leakage after each step is complete.
1. Close the Alarm Control Valve and then open the Main
Drain Valve. Let the water flow for about 5 seconds and
then close the Main Drain Valve. This should flush any
loose debris that may have become trapped between
the Clapper Facing and the Seat Ring or in the seating
area of the Main Drain Valve. Re-open the Alarm Con-
trol Valve.
2. Repeat Step No. 1 if the rate of continued flow out of the
drain was noticeably reduced.
3. Open the Alarm Test Valve and allow water to flow for
about 5 seconds before re-closing the valve. This
should flush any loose debris that may have become
trapped in the seating area of the Alarm Test Valve.
4. Repeat Step No. 3 if the rate of continued flow out of the
drain was noticeably reduced.
5. Close the main control valve and open the Alarm Test
Valve to relieve the supply pressure. Temporarily re-
move the Alarm Test Tube and tube fittings, and replace
with two 1/2 inch NPT plugs. Open the main control
valve two full turns.
If the alarm line leakage is no longer present, the Alarm
Test Valve must be replaced or repaired before reinstall-
ing the Alarm Test Tube. If the alarm line leakage is still
present, then the water is likely leaking from the “Alarm
Connection”, refer to Step No. 6.
6. If it appears that the leakage noted in Step No. 5 is from
the Alarm Connection, drain the system in accordance
with the prescribed procedure. After the system has
been drained, remove the Handhole Cover.
While holding the Spring down by the coils, remove the
Hinge Pin. Remove the Spring and Clapper Assembly
(Items 5, 6, 7, and 8 in Figure 1).
7. Using a light, check for and remove any debris that may
have become lodged within the Seat Ring groove. In-
spect the Seat Ring seat for any damage. If the Seat
Ring has become dented across the seat then the Alarm
Check Valve will have to be replaced. It is impractical to
re-face a Seat Ring in the field.
8. Check for and remove any debris which may have be-
come lodged in the Clapper Facing. If a minor imperfec-
tion remains in the Clapper Facing, then turn it over after
thoroughly cleaning both surfaces with a clean cloth. Re-
place the Clapper Facing if necessary. Be sure to se-
curely re-tighten the retaining screw for the Clapper
Washer.
9. Replace the Spring and Clapper Assembly as shown in
Figure 1. Then while holding the coils of the Spring
down, re-insert the Hinge Pin. Be sure that the Hinge
Pin is pushed all the way to the rear of the valve.
10. Replace the Handhole Cover and Alarm Test Tube. Re-
turn the Alarm Valve to operation in accordance with the
steps described in the Setting Procedure section.
Clogged Alarm Line Drain
If water either does not flow or only dribbles out of the
alarm line drain during an alarm test, then it is likely that
the screen protecting the Restriction Assembly drain ori-
fice (Ref. Figure 4) has become clogged.
NOTE
A clogged alarm line drain will increase the likelihood of a
false alarm in a variable pressure system.
If the installation has a closed alarm line drain, first open
the union below the Drain Restriction and then remove
the Drain Restriction for cleaning by back-flushing the
screen. Re-install the Drain Restriction and re-assemble
the drain line.
If the installation has an open alarm line drain unscrew
the Drain Restriction from the Restriction Assembly and
clean the screen by back-flushing.
Loss of Excess System Pressure
In a variable pressure system, the System Pressure
Gauge should normally indicate a pressure greater than
that shown by the Supply Pressure Gauge. Also, the
value should be close to that of the peak supply pressure
which has occurred after the system was placed in serv-
ice.
NOTE
Loss of excess system pressure will increase the likeli-
hood of a false alarm in the case of a variable pressure
system.
Follow the procedure indicated below to correct a loss of
excess system pressure condition.
1. Check for signs of continued leakage from the alarm line
drain. If rust stains and/or water deposits indicate that
continued leakage has been taking place, take correc-
tive action according to the procedure described in the
sub-section entitled “Leakage From Alarm Line Drain”.
2. If there are no signs of continued leakage from the
alarm line drain, close the main control valve, open the
STAR SPRINKLER INC.
2-1.1.30 Page 7
FIGURE 7
ALARM VENT TRIM
(Ordered separately for use when a
Water Motor Alarm is not installed)
NO. DESCRIPTION . . . QTY. PART NO.
1 3/4" x 1/4" Bushing . . . 1 CH
2 3/32" (2.4 mm)
VentFitting.......1 920321002
3 1/4" Tube, 5 ft. long . . 1 CH
CH: Common Hardware
OBSOLETE

Alarm Test Valve to relieve supply pressure, and then
slowly loosen the External By Pass Tube from the By-
pass Check Valve.
Remove the External By Pass Tube and check for leak-
age past the By Pass Check Valve. If there is leakage,
debris may have become lodged between its clapper
and seat. Drain the system in accordance with the pre-
scribed procedure and then check or replace the By-
pass Check Valve as required.
Reassemble the External By Pass Tube and return the
Alarm Valve to operation in accordance with the steps
described in the Operating Procedure section.
3. If there are no signs of leakage past either the Alarm
Check Valve Clapper per Step 1 or the Bypass Check
Valve per Step 2, inspect the sprinkler system for leak-
age.
System Pressure More Than 175 psi (12.1 Bar)
The maximum rated service pressure of the Alarm Check
Valves is 175 psi (12.1 bar). Wet pipe sprinkler systems
subject to ambient temperatures in excess of 100°F/38°C
can experience significant increases in system pressure
due to the thermal expansion of the water. In particular, a
gridded wet-pipe system with a relatively small air pocket
and no relief valve can be subjected to an increase of
more than 100 psi (6.9 bar), due to an increase in ambi-
ent temperature of approximately 50°F/28°C.
As necessary, install a pressure relief valve in accord-
ance with the requirements of the authority having juris-
diction, to automatically relieve the over pressure which
could otherwise be created in wet-pipe systems which
are exposed to significant increases in ambient tempera-
ture.
False Alarms
If repeated false alarms occur in a variable pressure sys-
tem:
1. Check for and correct the cause of continued leakage
out the alarm line drain.
2. Check for and clean a clogged alarm line drain.
3. Check for and correct the cause of a loss in excess sys-
tem pressure.
4. Drain the sprinkler system and re-fill it in accordance
with the steps described in the Setting Procedure sec-
tion.
Intermittent Alarms
If the pressure alarm switch gives a steady signal but the
water motor generates an intermittent alarm, check for
binding in the water motor alarm drive shaft.
If the water motor alarm and/or the pressure alarm switch
provide an intermittent alarm, it is likely the consequence
of an excessive amount of air being trapped within the
sprinkler system. Drain the sprinkler system and re-fill it
in accordance with the steps described in the Setting Pro-
cedure section.
A discontinuance of an alarm may also be caused by the
Clapper closing due to a sudden drop in supply pressure
or the shut-off of a pump in the supply line. These types
of problems can only be corrected by maintaining a
steady supply pressure.
ORDERING PROCEDURE
Please Specify:
1 Hydrus S30 (Groove x Groove) Alarm Check Valve,
2-1/2 Inch (DN65): #4915
Hydrus S3001 (Flange x Groove) Alarm Check Valve,
2-1/2 Inch (DN65): #4910
2. Model S310 Retard Chamber, #6420
3. Alarm Check Valve Trim for 2-1/2 Inch Valves,
Vertical Closed Drain (Ref. Fig. 5), #4961
Vertical Open Drain (Ref. Fig. 6), #4966
4. Alarm Vent Trim (Ref.Fig.7), #4962-02
Refer to Price List for for complete listing of Part
Numbers with respect to sizes, replacement parts, etc.
AVAILABILITY AND SERVICE
Star Sprinkler Inc. products and devices are available
worldwide through a network of independent distributors.
Please contact Star Sprinkler Inc. for information and the
name and address of the Star distributor in your area.
LIMITED WARRANTY
Seller warrants for a period of one year from date of ship-
ment (warranty period) that the products furnished here-
under will be free of defects in material and workmanship.
For further details on Warranty, contact Star Sprinkler Inc.
STAR SPRINKLER INC.
Page 8 2-1.1.30
7071 S. 13th Street • Suite 103
Oak Creek, WI 53154
414-570-5000 • 800-558-5236 PRINTEDINU.S.A.6-99
OBSOLETE