Differential Chamber of the Accelera-
tor is equal to that in the system, then
the Accelerator is set and ready for
service.
Step 13. Close the Accelerator Con-
trol Valve and then slowly open the dry
pipe valve’s low body drain valve, to
bleed off any excess water above the
priming level. Reclose the low body
drain valve, return system pressure to
its normal value, and then completely
open the Accelerator Control Valve.
Step 14. Partially open the main con-
trol valve. Close the main drain valve
as soon as water discharges from the
drain connection, and then completely
open the main control valve. The fire
protection system is now ready for
service.
NOTE
After placing a fire protection system
in service, notify the proper authorities
and advise those responsible for
monitoring proprietary and/or central
station alarms.
Care and
Maintenance
The following procedures and inspec-
tions should be performed as indi-
cated, in addition to any specific re-
quirements of the NFPA, and any
impairment must be immediately cor-
rected.
The owner is responsible for the in-
spection, testing, and maintenance of
their fire protection system and de-
vices in compliance with this docu-
ment, as well as with the applicable
standards of the National Fire Protec-
tion Association (e.g., NFPA 25), in
addition to the standards of any
authority having jurisdiction. The in-
stalling contractor or product manu-
facturer should be contacted relative
to any questions.
It is recommended that automatic
sprinkler systems be inspected,
tested, and maintained by a qualified
Inspection Service.
The Model ACC-1 Accelerator must be
maintained and serviced in accord-
ance with the following instructions:
NOTE
If an Accelerator is to be temporarily
taken out of service, then the proper
authorities and all personnel who may
be affected must be notified.
Before performing an alarm test, notify
the proper authorities and all person-
nel who may be affected.
Before closing a fire protection system
main control valve for inspection or
maintenance work on the fire protec-
tion system that it controls, permission
to shut down the affected fire protec-
tion system must be obtained from the
proper authorities and all personnel
who may be affected by this action
must be notified.
Accelerator Inspection Procedure
It is recommended that the following
Accelerator inspection procedure be
performed at quarterly.
Step 1. Verify that the Reset Knob is
screwed in.
Step 2. Close the system’s main con-
trol valve and open the main drain
valve to relieve the supply pressure to
the dry pipe valve.
Step 3. Verify that the Accelerator
Control Valve is open.
Step 4. Open the Inspector’s Test
Connection. Verify that the time to Ac-
celerator trip is essentially the same
as in previous tests. A momentary
burst of air from the Automatic Drain
Valve indicates that the Accelerator
has tripped.
NOTE
As the system pressure is decreasing,
check for any sign of water being dis-
charged from the Accelerator Relief
Port.
Step 5. Depress the plunger of the
Automatic Drain Valve. A steady
stream of exhausting air indicates that
the Accelerator has properly latched in
the Tripped position.
Step 6. Close the Accelerator Control
Valve and the Inspector’s Test Con-
nection.
Step 7. Clean out the Strainer at the
Accelerator inlet.
NOTE
A clogged strainer can prevent the Ac-
celerator from properly tripping the dry
pipe valve.
Step 8. Reset the Accelerator in ac-
cordance with Steps 7 through 14 of
the Setting Procedure Section.
System Inspection Procedure
It is recommended that the following
Accelerator and dry pipe valve inspec-
tion procedure be performed at least
annually, preferably in the spring or
summer of the year. This procedure
can only be used whenever there is no
danger that flooding the system will
expose the water to freezing condi-
tions.
Step 1. Verify that the Reset Knob is
screwed in.
Step 2. Open the Inspector’s Test
Connection. Verify that tripping of the
Accelerator operates the dry pipe
valve and that water is delivered out of
the Inspector’s Test connection within
theelapsedtimerequiredbythe
authority having jurisdiction.
NOTE
As the system pressure is decreasing,
check for any sign of water being dis-
charged from the Accelerator Relief
Port.
Step 3. Reset the accelerator and dry
pipe valve in accordance with the Set-
ting Procedure Section.
Trouble
Shooting
Refer to the following subsections, as
applicable. If the designated instruc-
tions do not remedy the particular
problem, refer to the Accelerator Dis-
assembly and Reassembly subsec-
tion.
Water Discharge From Accelera-
torReliefPort
Use the following instructions if water
is discharged from the Accelerator Re-
lief Port during a trip.
Step 1. Verify that the connection from
the Accelerator to the system piping is
installed in accordance with Step 4 of
the Installation Section. Correct if nec-
essary.
Step 2. Investigate for and correct any
condition which could result in an ex-
cessive build-up of drain back and/or
condensate water.
Step 3. Review procedures which
were used to set the Accelerator. Fail-
ure to perform Step 5 of the Setting
Procedure can permit a small amount
of water to enter the Pilot Chamber of
the Accelerator.
Slow Fill of Differential Chamber
Use the following instructions if the
time to fill the Differential Chamber is
longer than the maximum value indi-
cated in Step 11 of the Setting Proce-
dure Section.
Step 1. Check to see that the Accel-
erator was reset per Step 8 of the
Setting Procedure Section.
Step 2. Close the system’s main con-
trol valve and open the main drain
valve.
Page 7 of 10
TFP1112
To Next Page
Loading...
Need help?
General
