Tyco ACC-1 Operation Manual

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Model ACC-1 Dry Pipe Valve Accelerator
External Resetting Quick Opening Device
For Dry Pipe Valves
General
Description
The Model ACC-1 Accelerator is a
quick opening device intended for at-
tachment to the Tyco Fire & Building
Products, 2-1/2, 3, 4 or 6 inch Model
DPV-1 Dry Pipe Valve. The Model
ACC-1 Accelerator reduces the time
for valve operation following the op-
eration of one or more automatic sprin-
klers.
The Model ACC-1 Accelerator auto-
matically adjusts to both small and
slow changes in system pressure, but
trips when there is a rapid and steady
drop in pressure (as in the case of a
sprinkler operation). Upon tripping, the
Accelerator transmits system air pres-
sure to the intermediate chamber of
the Model DPV-1 Dry Pipe Valve. This
neutralizes the differential pressure
holding the Model DPV-1 Dry Pipe
Valve closed and permits it to open.
The Model ACC-1 Accelerator has a
unique, positive action, internal anti-
flood device and a ball float which
combine to prevent water and water
borne debris from entering the more
sensitive operating areas of the accel-
erator. The anti-flood device seals and
latches immediately upon operation of
the Model ACC-1 Accelerator without
waiting for a pressure build-up in the
intermediate chamber of the dry pipe
valve. The latching feature keeps the
anti-flood device sealed, even while
the system is being drained. The ball
float seals the pilot chamber inlet port
if there is an inadvertent trip of the dry
pipe valve, due for example, to an air
compressor failure combined with a
slow loss in system air pressure due to
a leak.
The Model ACC-1 Dry Pipe Valve Ac-
celerator is a direct replacement for
the Central Model B, Gem Model
F311, and Star Model S430. Contact
the Technical Services Department for
information concerning the use of the
Page 1 of 10
ACC-1 for use with dry pipe valves
other than the Model DPV-1.
WARNING
The Model ACC-1 Dry Pipe Valve Ac-
celerator described herein must be in-
stalled and maintained in compliance
with this document, as well as with the
applicable standards of the National
Fire Protection Association, in addition
to the standards of any other authori-
ties having jurisdiction. Failure to do
so may impair the performance of
this device.
The owner is responsible for maintain-
ing their fire protection system and de-
vices in proper operating condition.
The installing contractor or sprinkler
manufacturer should be contacted
with any questions.
Technical
Data
Approvals
UL and ULC Listed. FM and LPCB
Approved.
Maximum Working Water Pressure
250 psi (17,2 bar)
Maximum Working Air Pressure
70 psi (4,8 bar)
Pressure Decay For Trip
1 psi/min (0,07 bar/min)
Physical Characteristics
Body components constructed of
alodine coated aluminum alloy with
austenitic series stainless steel inter-
nal components. Seals are EPDM and
silicone.
MARCH 2011
Design
Data
The connection to the system piping,
Figure 4, must be located so that drain
back water will not flow into the Accel-
erator piping and it must be located at
a point above the maximum expected
level of the drain back/condensate
water.
If the connection is made to the riser,
it must be located at least two feet
above the level of the dry pipe valve.
Connections to a feed or cross main
must be made either to the side or top
of the main.
NOTES
Failure to follow the above instructions
can result in accidental tripping due to
closure of the ball float.
Quick operation of the Accelerator
does not ensure that the fire protection
system will meet the water delivery
time requirement of the authority hav-
ing jurisdiction (following opening of
the Inspector's Test Connection). The
sprinkler system designer needs to be
aware that water delivery time is pri-
marily determined by the configuration
and volume of the piping network, sys-
tem air pressure at time of Accelerator
trip, and water supply characteristics.
TFP1112