Tyco STAR Model A Manual Download Page 10

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b. Slowly remove the plug from the Strainer at the Ac-

celerator inlet to relieve any inlet pressure. This pro-
cedure will trip the Accelerator if it is not already
tripped.

c. Clean out the Strainer at the Accelerator inlet.

NOTE

A clogged strainer can prevent the Accelerator from
properly tripping the system.

d. Open the Accelerator Bleed-off Valve and blow any

residual water in the connection to the system pip-
ing out through the tube to the Drip Funnel. Close
the Bleed-off Valve after water ceases to drain.

e. Open the Accelerator Control Valve one-quarter

turn and blow any residual water in the connection
to the system piping out through the Strainer.

f. Close the Accelerator Control Valve and replace

the Strainer Plug.

g. Slowly remove the Vent Plug located in the front of

the Accelerator Cover and bleed off any residual
pressure in the Accelerator Differential Chamber.

h. Unscrew (counter-clockwise rotation) the knurled

Reset Knob at the front of the Accelerator until it re-
sists further turning. A click, which is the sound of
the Lever snapping back into the set position,
should be heard. Screw the Reset Knob back in un-
til it is finger tight.

i. Replace the Vent Plug.
j. Verify that the system pressure has returned to nor-

mal.

k. Using a watch, note the time for the pressure in the

Differential Chamber of the Accelerator to increase
to 10 psi, after the Accelerator Control Valve is
opened. The time should be within the range of val-
ues indicated in Table A.

NOTE

If the time to pressurize the Differential Chamber of
the S430 Accelerator is not within the range of val-
ues given in Table A or any other resetting problem
is encountered, the Accelerator Control Valve
should be closed and corrective action taken (refer
to 2-5.4.10).

l. When the air pressure in the Differential Chamber

of the Accelerator is equal to that in the system, the
Accelerator is set and ready for service.

21. Slowly open the Main Control Valve (Fig. 1). Close the

Main Drain Valve (Fig. 7) as soon as water discharges
from the drain connection.
Observe the Automatic Drain Valve (Fig. 7) for leaks.
If there are leaks, the Clapper Assembly is not properly
seated and the Model A Preaction Valve must be reset.
Determine/correct the cause of the leakage problem.
If there are no leaks, fully open the Main Control Valve
(Fig. 1).

22. Verify that the releasing panel is returned to a normal

standby condition.

23. It is recommended that the Main Control Valve and the

System Shut-Off Valve (if applicable) be locked in the
full open position if they are not monitored by supervi-
sory switches.

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.

The Model A Preaction Valve is now set for service.

MAINTENANCE AND SERVICE

The Model A Preaction Valve requires regularly sched-
uled maintenance and service. In addition, it is recom-
mended that the proper operation of the system and con-
dition of the system, in which it is utilized, be periodically
verified in accordance with the following described inspec-
tion procedure.
Any impairment to the system must be promptly cor-
rected in order to maintain the integrity of the system.
It is recommended that the System Inspection Procedure
be performed at least semi-annually by a qualified Inspec-
tion Service.

NOTES

1. It is recommended that individuals responsible for care

and maintenance of the Model A Preaction Valve de-
velop an overall understanding of the system, prior to
performing inspection and/or maintenance procedures.
These instructions, as well as individual instructions for
the dry pilot actuator, solenoid valve, manual control sta-
tion, switches, accelerator (if applicable), and pressure
maintenance device should be reviewed.

2. The following procedures pertain to the Model A Preac-

tion Valve portion of the Double Interlock Preaction Sys-
tem. Refer to the manufacturer’s instructions and NFPA
25 for care and maintenance procedures for all other de-
vices (e.g., electric detection, main control and system
shut-off valves, supervisory devices, sprinklers, etc.).

3. Before performing the System Inspection Procedure,

which will result in operation of alarms, notify the proper
authorities and all personnel who may be affected.

4. Before closing a fire protection system main control

valve for maintenance work on the fire protection sys-
tem which it controls, permission to shut down the af-
fected fire protection system must be obtained from the
proper authorities and all personnel who may be af-
fected by this action must be notified.

5. Should the water supply pressure drop below its normal

range (as in the case of an interrupted water supply con-
dition), immediately close the main control valve and fol-
low the procedures given under the heading “Drop In
Water Supply Below Normal Range”, in the following
section on Service Recommendations.

SYSTEM INSPECTION PROCEDURE

1. Close the Main Control Valve (Fig. 1) and then open the

Main Drain Valve (Fig. 7).

2. Open (energize) the Solenoid Valve by manually operat-

ing the releasing panel. Verify that there is no leakage
out the Dry Pilot Actuator drain. Also, verify full opera-
tion of the releasing panel and its associated alarms.

NOTES

During this procedure, the Solenoid Valve is opened;however,
the Dry Pilot Actuator should remain closed and the Model A
Preaction Valve Differential Chamber should remain pressur-
ized.

STAR SPRINKLER INC.

Page 10

2-4.1.10

System Air

Time to 10 psi, sec.

Pressure, psi

Minimum

Maximum

160

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