Tyco ACC-1 User manual

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
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.
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.
Model ACC-1 Dry Pipe Valve Accelerator
External Resetting Quick Opening Device
For Dry Pipe Valves
Page 1 of 10 TFP1112
MARCH 2011
Technical Services: Tel: [phone] / Fax: [phone]

Operation
The Inlet Chamber of the Accelerator,
Figure 1, is pressurized via its connec-
tion to the system (at a point above the
maximum expected level of drain back
water). The Pilot Chamber is, in turn,
pressurized through its inlet port which
is formed by the annular opening
around the lower tip of the Anti-Flood
Valve. As the Pilot Chamber in-
creases in pressure, the Differential
Chamber is pressurized through the
Restriction.
The Accelerator is in its set position
while it is being pressurized as well as
after the Inlet, Pilot Chamber and Dif-
ferential Chamber pressures have
equalized. When in the Set position,
the Outlet Chamber is sealed off by the
Exhaust Valve which is held against its
seat by a combination of the Spring
pushing up against the Lever and the
net downward force exerted by the
pressure in the Pilot Chamber.
Both small and slow changes in sys-
tem pressure are accommodated by
flow through the Restriction. When,
however, there is a rapid and steady
drop in system (i.e., Inlet and Pilot
Chamber) pressure, the pressure in
the Differential Chamber reduces at a
substantially lower rate. This condition
creates a net downward force on the
Plunger which rotates the Lever. As
the Lever is rotated, Figure 2, the Re-
lief Valve is raised out of the Relief Port
and the Anti-Flood Valve is depressed
downward into the Pilot Chamber Inlet
Port, venting the Pilot Chamber.
The system pressure in the Inlet
Chamber then forces (raises) the Ex-
haust Valve off its seat. This continues
the rotation of the Lever into the
tripped (latched) position, Figure 2. As
the Exhaust Valve is raised off its seat,
system pressure is transmitted to the
intermediate chamber of the dry pipe
valve which neutralizes the differential
pressure holding the valve closed.
Following the dry pipe valve trip, major
water borne debris is prevented from
entering the Accelerator (via the con-
nection to the system piping) by the
Strainer located at its Inlet. Water and
any fine water borne debris such as silt
is prevented from entering the Pilot
Chamber by virtue of the Anti-Flood
Valve having sealed off its inlet port.
The Check Valve located downstream
of the Accelerator Outlet prevents any
water borne debris from entering the
Accelerator via the connection to the
intermediate chamber of the dry pipe
valve.
After the accelerator/dry pipe valve
has tripped and the sprinkler system
FIGURE 1
MODEL ACC-1 ACCELERATOR IN SET POSITION
FIGURE 2
MODEL ACC-1 ACCELERATOR IN TRIPPED POSITION
Page2of10 TFP1112

FIGURE 3
MODEL ACC-1 ACCELERATOR ASSEMBLY
NO. DESCRIPTION QTY. P/N
1Base 1 NR
2 Cover 1 NR
3 Upper Diaphragm
Plate 1 See (c)
4 Pivot Plate
Assembly 1 See (b)
aSpirolPin 1
b Pivot Plate 1
5 Plunger 1 See (a)
a Pan Hd. Machine
Screw 1
b Upper Diaphragm
Retaining Ring 2
c Upper Diaphragm 1
dJamNut 1
6 Exhaust Valve 1 See (a)
a Upper Plug 1
b Washer 1
c Lower Diaphragm 1
d Lower Plug 1
e O-Ring* 1
f O-Ring Retainer 1
g Exhaust Valve Screw 1
7 Rd. Head Machine
Screw,
1/4"-20 UNC x 5/8" 6 See (c)
8 Cover Gasket 1 See (a)
9 Vent Plug 1 See (c)
10 O-Ring* 1 See (a)
11 Restriction 1 See (a)
12 Restriction Access
Plug 1 See (c)
13 Pan Hd. Machine
Screw,
No. 10-32 UNF x 5/8" 4 See (b)
14 Cotter Pin 1 See (b)
15 Lever 1 See (b)
16 Retaining Ring 1 See (b)
17 Anti-Flood Valve 1 See (b)
18 Relief Valve 1 See (b)
19 Spring 1 See (b)
20 Relief Valve Seat 1 See (b)
21 O-Ring* 1 See (b)
22 Seal Washer 1 See (b)
23 Latch 1 See (a)
24 Fillerster Hd.
Machine Screw,
1/4"-20 UNC x 1-1/2" 8 See (c)
25 Plug Seat 1 See (c)
26 O-Ring* 1 See (c)
27 O-Ring* 1 See (a)
28 Reset Knob 1 See (c)
29 Anti-Flood Seat
Assembly
w/Ball Float 1 See (b)
a Insert 1
b Seal 1
c Guide 1
dBall 1
eClip 1
f O-Ring* 1
* Requires thin film of
FS3452 Fluorosilicone Grease
(a) Repair Parts Kit (a)
Includes Items 5, 6, 8,
10, 11, 23, 27 &
1.5 grams of FS3452 92-311-1-116
(b) Replacement Parts
Kit (b) Includes Items
4, 13-22, 29 &
1.5 grams of FS3452 92-311-1-117
(c) Replacement Parts
Kit (c) Includes Items
3, 7, 9, 12, 24-26, 28,
& 1.5 grams of FS3452 92-311-1-118
NR: Not Replaceable
Page 3 of 10
TFP1112

FIGURE 4
MODEL ACC-1 DRY PIPE VALVE ACCELERATOR TRIM
FOR 2-1/2, 3, 4, AND 6 INCH MODEL DPV-1 DRY PIPE VALVES
PRESSURE
ACCELERATOR
GAUGE
ACCELERATOR
CONTROL VALVE
(NORMALLY OPEN)
827
1
7
5
10 476
6
7
5
9
7
6
7
RESET
KNOB
PLUG
VENT
ACCESS PLUG
RESTRICTION
PRESSURE
ACCELERATOR
GAUGE
ACCELERATOR
TRIM CONNECTION
TO INTERMEDIATE
CHAMBER
1/2" NPT
2-1/2 or 3 INCH (DN65 or DN80)
6 INCH (DN150)4 INCH (DN100)
PRESSURE
ACCELERATOR
GAUGE
8
7
7
5
7
5
7
9
7
6
4
7
10 6
6
2
1
ACCELERATOR
CONTROL VALVE
(NORMALLY OPEN)
827
1
7
5
10 476
6
7
5
9
7
6
7
CONNECTION TO
SYSTEM PIPING
1/2" NPT
PIPE VALVE
DRY
ACCELERATOR
PRESSURE
ACCELERATOR
GAUGE
PIPE VALVE
DRY
ACCELERATOR
PIPE VALVE
DRY
ACCELERATOR
ACCELERATOR
ACCELERATOR
TRIM CONNECTION
TO INTERMEDIATE
CHAMBER
1/2" NPT
ACCELERATOR
TRIM CONNECTION
TO INTERMEDIATE
CHAMBER
1/2" NPT
NOMENCLATURE
NO QTYDESCRIPTION P/N
6 1/2" 90° Elbow 3 CH....
8
9
1/2" x 1-1/2"
1/2" x 3" Nipple
1/2" x 3-1/2"
6
1
1
CH
CH
CH
7
Nipple
Nipple
....
...........
...........
Nipple
10 1/2" x 5-1/2"
1CH...........
CH: Common Hardware
NO QTYDESCRIPTION P/N
5 1/2" Union 2 CH........
46-050-1-0043 1/2" Ball Valve 1....
46-049-1-004
41/2"Swing
1CheckValve ......
NO
1 250 psi/ 1750 kPa
1
QTY
92-343-1-012
DESCRIPTION P/N
52-353-1-0052 1/2" Y-Strainer 1
Air Pressure
Gauge...........
....
PIPE VALVE
DRY
ACCELERATOR
3*
ACCELERATOR
CONTROL VALVE
(NORMALLY OPEN)
CONNECTION TO
SYSTEM PIPING
1/2" NPT
3*
3*
CONNECTION TO
SYSTEM PIPING
1/2" NPT
In accordance with the 2007 edition of NFPA 13, 7.2.4.4, the Accelerator Control Valve
*shall be supervised. Where a signaling service is to utilized, replace the Ball Valve with
a BVS-1/2" electrically supervised control valve.
*
*
*
Page4of10 TFP1112

Page 5 of 10
TFP1112
FIGURE 5
MODEL ACC-1 DRY PIPE VALVE ACCELERATOR TRIM
— INSTALLATION DIMENSIONS —
8"
(200 mm) 2-1/2 & 3 INCH
(DN65 & DN80)
VALVE
12"
(300 mm)
15"
(380 mm)
4 INCH
(DN100)
VALVE
11-1/2"
(290 mm)
6 INCH
(DN150)
VALVE
23-3/4"
(600 mm)
11-1/8"
(283 mm)
24-1/2"
(625 mm)
21-1/8"
(540 mm)
15"
(380 mm)

has been drained, the piping from the
system to the Accelerator must also be
drained and the Accelerator reset/in-
spected according to the instructions
given in the Setting Procedure Sec-
tion.
The rate-of-flow through the Restric-
tion has been set such that the Model
ACC-1 Accelerator provides the maxi-
mum practical sensitivity to a loss in
system pressure due to a sprinkler
operation while still being capable of
automatically compensating for nor-
mal variations in system pressure
such as are caused by environmental
temperature changes. A test for verify-
ing that the rate-of-flow through the
Restriction is within the range for opti-
mum Accelerator performance is
given in the Setting Procedure Sec-
tion.
Installation
The Model ACC-1 Accelerator must be
installed in accordance with the follow-
ing instructions:
NOTE
Failure to follow these instructions can
result in flooding of the Accelerator
and accidental tripping due to closure
of the ball float.
Step 1. The Accelerator must be posi-
tioned vertically and trimmed per the
arrangement shown in Figure 4. Apply
pipe thread sealant sparingly to male
threads only.
Step 2. The Strainer located at the
Accelerator Inlet must be installed with
its arrow pointed towards the Accel-
erator.
Step 3. The Check Valve located in
the line between the Accelerator Out-
let and the intermediate chamber of
the dry pipe valve must be installed
horizontally with its arrow pointed in
the direction of flow to the intermediate
chamber.
Step 4. The connection to the system
piping 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
priming water. Connections to a feed
or cross main must be made either to
thesideortopofthemain.
Step 5. The accelerator/dry pipe valve
combination must be installed in a
heated enclosure which is maintained
at a minimum temperature of
40°F/4°C. Heat tracing is not permit-
ted.
Step 6. Close the Accelerator Control
Valve until the Model ACC-1 Accelera-
tor is ready to be placed in service.
The Accelerator Control Valve must
be closed during hydrostatic testing of
the system in order to prevent damage
to the Ball Float. After the system is
hydrostatically tested and drained, the
Accelerator connection to the system
must be independently drained
through the Strainer clean-out plug by
first removing the Strainer clean-out
plug and then opening the Accelerator
Control Valve to vent the line.
Setting
Procedure
The Model ACC-1 Accelerator and Dry
Pipe Valve must be reset and restored
to service as soon as possible after an
operation. Follow the procedure indi-
cated below.
Step 1. Close the system main control
valve, the air supply control valve (to
the system) and the Accelerator Con-
trol Valve.
Step 2. Open the Inspector’s Test
Connection and then open the main
drain valve as well as all auxiliary (low
point) drains.
Step 3. After the system has been
drained, close the Inspector’s Test
Connection and all auxiliary drain
valves. Leave the main drain valve
open.
Step 4. Set the dry pipe valve in ac-
cordance with the instructions given in
the appropriate technical data sheet.
Restore normal system air pressure.
Leave the main control valve closed
and the main drain valve open.
Step 5. While holding the plunger of
the dry pipe valve’s automatic drain
valve depressed, partially open the
Accelerator Control Valve, and allow
the water in the Accelerator piping to
blow out. After water spray stops dis-
charging, close the Accelerator Con-
trol Valve and then release the
plunger. (
This instruction does not ap-
ply when the Model ACC-1 Accelera-
tor is being set for the first time, since
the Accelerator is shipped in the set
position. Proceed to Step 6.
)
Step 6. 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 7. Slowly remove the Vent Plug
located in the front of the Accelerator
Cover and bleed off any residual air
pressure in the Differential Chamber.
Step 8. Unscrew (counter-clockwise
rotation) the knurled Reset Knob at the
front of the Accelerator until it resists
further turning. A click, which is the
sound of the Lever snapping back into
the Set Position, may be heard. Screw
theResetKnobbackinuntilitisfinger
tight.
NOTE
Do not wrench on the reset Knob,
since damage may result. The Reset
Knob will turn with finger torque only.
Step 9. Replace the Vent Plug.
Step 10. Verify that the system air
pressure has returned to normal.
Step 11. Partially open the Accelera-
tor Control Valve just enough to allow
air to slowly pass through the Accel-
erator Control Valve.
Using a watch, note the time for the
pressure in the Differential Chamber
of the Accelerator to increase to 10
psi. The time should be within the
range of values indicated in Table A
for optimum performance of the Accel-
erator.
NOTE
If the time to pressurize the Differential
Chamber to 10 psi is not within the
range of values given in the Table A,
then the Accelerator control Valve
should be closed and the corrective
procedure described in the Care and
Maintenance Section followed.
Step 12. When the air pressure in the
Page6of10 TFP1112
Pressure, psi Minimum, sec. Maximum, sec.
20 24 160
25 18 116
30 15 92
40 10 60
50 8 48
60 6 36
TABLE A
DIFFERENTIAL CHAMBER FILL TIMES TO 10 PSI

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

Step 3. Check for any sign of external
leakage past the Accelerator Pressure
Gauge, Vent, and Restriction Access
Plug connections.
Step 4. Check for any sign of external
leakage past the Reset Knob and
Cover Gasket.
Step 5. Close the Accelerator Control
Valve.
Step 6. Gently insert a 3/32 inch or
smaller diameter probe into the Relief
Port. If the probe can be inserted more
than 1/4 inch then the Lever has not
reset and the Accelerator must be dis-
assembled for internal inspection. See
the instructions for Accelerator Disas-
sembly and Reassembly.
Step 7. Slowly remove the Accelerator
Vent Plug to bleed all pressure from
the Differential Chamber and then
slowly remove the Restriction Access
Plug to bleed all pressure from the
Pilot Chamber.
Step 8. Replace the Restriction and
then the Restriction Access Plug.
Step 9. Place the fire protection sys-
tem back in service in accordance with
Steps 9 through 14 of the Setting Pro-
cedure Section.
Unexplained Accelerator Trip
Use the following instructions if there
is an unexplained accidental trip of the
Accelerator.
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. Verify the time to fill the Differ-
ential Chamber as described in Step
11 of the Setting Procedure Section. If
the time to fill the Differential Chamber
to 10 psi is longer than the maximum
indicated value, then follow the in-
structions given under “Slow Fill of Dif-
ferential Chamber”.
Step 3. If the time to fill the Differential
Chamber is within the indicated range
of values, then investigate for and cor-
rect any condition which could result in
excessive leakage of system air pres-
sure.
Fast Fill of Differential Chamber
or Long Time to Accelerator Trip
Use the following instructions if the
time to fill the Differential Chamber is
shorter than the minimum value indi-
cated in Step 11 of the Setting Proce-
dure Section. This procedure should
also be followed if the time to Accel-
erator trip (following opening of the
Inspector’s Test Connection) is signifi-
cantly longer than expected.
Step 1. Close the system’s main con-
trol valve and open the main drain
valve.
Step 2. Close the Accelerator Control
Valve.
Step 3. Slowly remove the Accelerator
Vent Plug to bleed all pressure from
the Differential Chamber and then
slowly remove the Restriction Access
Plug to bleed all pressure from the
Pilot Chamber.
Step 4. Using a slotted screw driver,
check the tightness of the Restriction.
Step 5. Inspect the Restriction’s O-
ring seal. The O-ring must be replaced
if there are any signs of nicks, cuts, or
deterioration due to age. Replace the
Restriction after cleaning and lubricat-
ing its O-ring with a non-petroleum
based grease (such as Dow Corning
FS3452). Replace the Vent Plug and
Restriction Access Plug.
Step 6. If the Restriction and its O-ring
are found to be in good condition, then
it is likely that there is leakage past the
Plunger. Remove the Cover from the
Base. Check that the six screws secur-
ing the Upper Diaphragm Plate to the
Cover are tight.
Inspect the Upper Diaphragm for any
sign of cracks, pin holes or deteriora-
tion due to age. Replace the Plunger if
there is any possibility of leakage past
the Upper Diaphragm.
Step 7. Reassemble the Accelerator
and place the fire protection system
back in service in accordance with
Steps 10 through 14 of the Setting
Procedure Section.
Air Leakage Out Automatic Drain
If there is leakage of air out the Auto-
matic Drain of the dry pipe valve, after
the Accelerator and dry pipe valve
have been placed in service, then it
will be necessary to first determine
whether the leakage is past the Accel-
erator or the dry pipe valve.
Close the Accelerator Control Valve.
Slowly remove the Accelerator Vent
Plug to bleed all pressure from the
Differential Chamber and then slowly
remove the Restriction Access Plug to
bleed all pressure from the Pilot
Chamber.
If leakage out the Automatic Drain per-
sists then refer to the dry pipe valve
Technical Data Sheet for maintenance
instructions. If leakage out of the Auto-
matic Drain stops, then the Accelera-
tor will have to be taken out of service
and the Accelerator Plug Seat re-
moved for cleaning of the seat and the
lower O-ring area on the Exhaust
Valve.
Accelerator Disassembly and Re-
assembly (For Internal Inspection
As Necessary)
Step 1. Close the system’s main con-
trol valve and open the main drain
valve.
Step 2. Close the Accelerator Control
Valve.
Step 3. Slowly remove the Accelerator
Vent Plug to bleed all pressure from
the Differential Chamber and then
slowly remove the Restriction Access
Plug to bleed all pressure from the
Pilot Chamber.
Step 4. Break the union connections
at the Inlet and Outlet of the Accelera-
tor and remove it from the line. Plug
the connection to the intermediate
chamber of the dry pipe valve and
place the fire protection system in
service while the Accelerator is out for
maintenance.
Step 5.Remove the eight screws hold-
ing the Cover to the Base and remove
the Cover.
Step 6. Remove the six screws hold-
ing the Upper Diaphragm Plate to the
Cover. Remove the Plunger and in-
spect the Upper Diaphragm to be sure
that it is flexible and free from physical
damage or deterioration due to age.
Check the Jam Nut to assure that it is
assembled tightly to its Screw. Re-
mount the Plunger and Upper Dia-
phragm Plate taking care to cross-
tighten the screws uniformly.
Step 7. Replace the Restriction if it
has been wetted. Clean and lubricate
the Restriction O-ring seal with a non-
petroleum based grease (such as Dow
Corning FS3452).
Replace the Vent Plug and Restriction
Access Plug.
Step 8. Remove the Retaining Ring
from the Upper Plug portion of the
Exhaust Valve. Remove the four
screws holding the Pivot Plate. Re-
move the sub-assembly of the Lever
and Pivot Plate, the Exhaust Valve,
the Anti-Flood Valve and the Relief
Valve.
Step 9. Inspect the Lower Diaphragm
to be sure that it is flexible and free
from physical damage or deterioration
duetoage.
Step 10. Check to see that the Ex-
haust Valve components are securely
assembled together. Only tighten by
gripping the flats using an open end
type wrench.
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Step 11. Inspect the O-ring on the
Lower Plug. It must be replaced if
there are any signs of nicks, cuts or
deterioration.
Step 12. Inspect the Relief and Anti-
Flood Valves. If either is bent or nicked
it must be replaced.
Step 13. Remove and inspect the
Latch. The catch leaf should extend
5/16 to 3/8 inches in the free state.
Step 14. Remove the Relief Valve
Seat. Remove the O-ring and Seal
Washer. Carefully clean the O-ring
and Seal Washer seating surfaces in
the valve seat and Accelerator Base.
If the O-ring or Seal Washer is nicked,
cut, or shows signs of deterioration, it
must be replaced.
Step 15. Replace the Seal Washer in
the Accelerator Base. Apply a thin film
of Dow Corning FS3452 Fluorosili-
cone Grease to the valve seat. Place
the O-ring in its seat (the lubricant will
hold it in place) and then thread the
Relief Valve Seat into the Body with 10
to 15 ft.lbs. of torque.
Step 16. Remove the Anti-Flood Seat
Assembly w/Ball Float. Check for dam-
aged parts and for freedom of Ball
movement. If parts are damaged or
inoperative, the Assembly must be re-
placed.
Step 17. After checking the Anti-Flood
Seat Assembly w/Ball Float, lubricate
theO-ringwithathinfilmofDowCorn-
ing FS3452 Fluorosilicone Grease,
and thread the Assembly into the Body
with 10 to 15 ft.lbs. of torque.
Step 18. Remove the Reset Knob.
Carefully clean the O-ring and its seat-
ing surface. If the O-ring is cut, nicked,
or shows signs of deterioration it must
be replaced. Lubricate the O-ring with
a thin film of Dow Corning FS3452
Fluorosilicone Grease.
Step 19. Reassemble the Accelerator
in the following order.
a. Thread the Reset Knob into the
Base finger tight.
b. Set the Anti-Flood Valve (with
Retaining Ring in place) and the
Compression Spring into their
seat.
c. Set the Exhaust Valve in place.
d. Slide the Relief Valve into the
slot at the end of the Lever and
then remount the sub-assembly
of the Lever and Pivot Plate in
the Base, taking care to cross-
tighten the screws uniformly.
e. Replace the Retaining Ring on
the Upper Plug.
f. Push the Anti-Flood Valve end
of the Lever down and release it
twice to assure that there is no
binding.
g. Replace the Latch making sure
that the notch in the bottom
straddles the Reset Knob and
that the tabs at the top are
seated in the Base. Place the
Lever in the Tripped (latched)
position.
h. Place the Cover upside down.
Set the Cover Gasket in place
and then push all eight screws
through the Gasket to assist in
assembling the Cover to the
Base.
i. Align the Cover with the Base
and tighten all of the screws uni-
formly.
j. Replace the Vent Plug and the
Restriction Access Plug.
k. Reinstall the Accelerator and re-
turn the system to service in ac-
cordance with the Setting Pro-
cedure Section.
Limited
Warranty
Products manufactured by Tyco Fire &
Building Products (TFBP) are war-
ranted solely to the original Buyer for
ten (10) years against defects in ma-
terial and workmanship when paid for
and properly installed and maintained
under normal use and service. This
warranty will expire ten (10) years
from date of shipment by TFBP. No
warranty is given for products or com-
ponents manufactured by companies
not affiliated by ownership with TFBP
or for products and components which
have been subject to misuse, im-
proper installation,corrosion, or which
have not been installed, maintained,
modified or repaired in accordance
with applicable Standards of the Na-
tional Fire Protection Association,
and/or the standards of any other
Authorities Having Jurisdiction. Mate-
rials found by TFBP to be defective
shall be either repaired or replaced, at
TFBP’s sole option. TFBP neither as-
sumes, nor authorizes any person to
assume for it, any other obligation in
connection with the sale of products or
parts of products. TFBP shall not be
responsible for sprinkler system de-
sign errors or inaccurate or incomplete
information supplied by Buyer or
Buyer’s representatives.
In no event shall TFBP be liable, in
contract, tort, strict liability or under
any other legal theory, for incidental,
indirect, special or consequential
damages, including but not limited to
labor charges, regardless of whether
TFBP was informed about the possibil-
ity of such damages, and in no event
shall TFBP’s liability exceed an
amount equal to the sales price.
The foregoing warranty is made in lieu
of any and all other warranties, ex-
press or implied, including warranties
of merchantability and fitness for a
particular purpose.
This limited warranty sets forth the ex-
clusive remedy for claims based on
failure of or defect in products, materi-
als or components, whether the claim
is made in contract, tort, strict liability
or any other legal theory.
This warranty will apply to the full ex-
tent permitted by law. The invalidity, in
whole or part, of any portion of this
warranty will not affect the remainder.
Ordering
Information
Orders for the ACC-1 Accelerator, trim
and replacement parts must include
the description and Part Number
(P/N). The Complete Model ACC-1
Accelerator Package includes the Ac-
celerator and Basic Galvanized Trim.
Complete Package:
Specify: Complete Model ACC-1 Ac-
celerator Package, P/N 52-311-2-002.
Accelerator Only:
Specify: Model ACC-1 Accelerator,
P/N 52-311-1-001.
Basic Galvanized Trim Only:
Specify: Model ACC-1 Accelerator,
Basic Galvanized Trim for 2-1/2 thru 6
inch Model DPV-1 Dry Pipe Valves,
P/N 52-311-2-010.
Replacement Parts for
Accelerator:
(Specify description) for use with
Model ACC-1 Accelerator,
P/N (see Figure 3).
Replacement Trim Parts:
Specify: (specify description),
P/N (see Figure 4).
Page 9 of 10
TFP1112

Page 10 of 10 TFP1112
TYCO FIRE & BUILDING PRODUCTS, 451 North Cannon Avenue, Lansdale, Pennsylvania 19446