Tyco ACC-1 User 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 attachment

Tyco Fire & Building Products, 2‑1/2,

to the
3, 4 or 6” Model DPV‑1 Dry Pipe Valve. The
Model ACC‑1 Accelerator reduces the time
for valve operation following the operation
of one or more automatic sprinklers.

The Model ACC‑1 Accelerator automatical‑
ly 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 pressure to the intermediate chamber of
the Model DPV‑1 Dry Pipe Valve. This neu‑
tralizes the dierential pressure holding the
Model DPV‑1 Dry Pipe Valve closed and per‑
mits it to open.

The Model ACC‑1 Accelerator has a unique,

e ac

positiv
and a ball oat which combine to prevent
water and water borne debris from entering
the more sensitive operating areas of the
acceler
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
featur
even while the system is being drained. The
ball oat 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 Accelerator
is a direct replacement for the Central Mod‑
el 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.

tion, internal anti‑ood device

ator. The anti‑ood device seals and

e keeps the anti‑ood device sealed,

WARNING

The Model ACC‑1 Dry Pipe Valve Accelerator
described herein must be installed and main‑
tained in compliance with this document, as
well as with the applicable standards of the
National Fire Protection Association, in addi‑

to

the standards of any other authori‑ties

tion
having jurisdiction. Failure to do so may im‑
pair the integrity of this device.

The owner is responsible for maintaining their
re protection system and devices in proper
operating condition. The installing contrac‑
tor or sprinkler manufacturer should be con‑
tacted relative to any questions.

Technical Data

Approvals

UL and ULC Listed. FM and LPCB Approved.

Maximum Working Water Pressure

17,2 bar (250

Maximum Working Air Pressure

4,8 bar (70

Pressure Decay For Trip

0,07 bar/min (1

Physical Characteristics

Body components constructed of alodine
coated aluminum alloy with austenitic se‑
ries stainless steel internal components.
Seals are EPDM and silicone.

psi)

psi)

psi/min)

Design Data

The connection to the system piping,
Figure 4, must be located so that drain
back water will not ow 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. Connec‑
tions 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 oat.

Quick operation of the Accelerator does not
ensure that the re protection system will
meet the water delivery time requirement of
the authority having jurisdiction (following
opening of the Inspector’s Test Connection).
The sprinkler system designer needs to be
aware that water delivery time is primarily
determined by the conguration and volume
of the piping network, system air pressure
at time of Accelerator trip, and water supply
characteristics.

Page 1 of 10 TFP1112_EN

Page 2 of 10 TFP1112_EN

FIGURE 1

MODEL ACC-1 ACCELERATOR IN SET POSITION

FIGURE 2

MODEL ACC-1 ACCELERATOR IN TRIPPED POSITION

TFP1112

Operation

The Inlet Chamber of the Accelerator, Fig‑
ure 1, is pressurized via its connection to
the system (at a point above the maximum
expected level of drain back water). The Pi‑
lot 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 increases
in pressure, the Dierential Chamber is
pressurized through the Restriction.

The Accelerator is in its set position while it
is being pressurized as well as after the In‑
let, Pilot Chamber and Dierential Chamber
pressures have equalized. When in the Set
position, the Outlet Chamber is sealed o
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 system pres‑
sure are accommodated by ow 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 Dierential Chamber reduces at a
substantially lower rate. This condition cre‑
ates a net downward force on the Plunger
which rotates the Lever. As the Lever is ro‑
tated, Figure 2, the Relief Valve is raised out
of the Relief Port and the Anti‑Flood Valve is
depressed downward into the Pilot Cham‑
ber Inlet Port, venting the Pilot Chamber.

The system pressure in the Inlet Chamber
then forces (raises) the Exhaust Valve o its
seat. This continues the rotation of the Le‑
ver into the tripped (latched) position, Fig‑
ure 2. As the Exhaust Valve is raised o its
seat, system pressure is transmitted to the
intermediate chamber of the dry pipe valve
which neutralizes the dierential pressure
holding the valve closed.

Following the dry pipe valve trip, major wa‑
ter borne debris is prevented from entering
the Accelerator (via the connection to the
system piping) by the Strainer located at its
Inlet. Water and any ne water borne debris
such as silt is prevented from entering the
Pilot Chamber by virtue of the Anti‑Flood
Valve having sealed o its inlet port. The
Check Valve located downstream of the Ac‑
celerator 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 has been
drained, the piping from the system to the
Accelerator must also be drained and the

SPRING

ANTI‑FLOOD VALVE

BALL FLOAT

1/2” NPT INLET

PLUNGER

FROM SYSTEM

PIPING

PILOT CHAMBER

INLET PORT

INLET CHAMBER

1/4” NPT GAUGE

CONNECTION

RESTRICTION

1/2” NPT OUTLET

RELIEF VALVE

EXHAUST VALVE

OUTLET CHAMBER

FIGURE 1

MODEL ACC‑1 ACCELERATOR IN SET POSITION

LEVER

RELIEF PORT

TO DRY PIPE VALVE

INTERMEDIATE

CHAMBER

FIGURE 2

MODEL ACC‑1 ACCELERATOR IN TRIPPED POSITION

DIFFERENTIAL
CHAMBER

PILOT CHAMBER

LATCH

RESET KNOB

TFP1112_EN Page 3 of 10

FIGURE 3

MODEL ACC-1 ACCELERATOR ASSEMBLY

NO. DESCRIPTION QTY. P/N

1 Base 1 NR
2 Cover 1 NR
3 Upper Diaphragm

Plate 1 See (c)

4 Pivot Plate

Assembly 1 See (b)
a Spirol Pin 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
d Jam Nut 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 Plu g 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
d Ball 1
e Clip 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) Includ es Items

4, 13-22, 29 &

1.5 grams of FS3452 92-311-1-117

(c) Replacement Parts

Kit (c) Includes Item s

3, 7, 9, 12, 24-26, 28,

& 1.5 grams of FS3452 92-311-1-118

NR: Not Replaceable

Page 3 of 8

TFP1112

NO. DESCRIPTION QTY P/N

1 Base 1 NR
2 Cover 1 NR
3 Upper Diaphragm Plate 1 See (c)
4 Pivot Plate Assembly 1 See (b)

a Spirol Pin 1
b Pivot Plate 1

5 Plunger 1 See (a)

a Pan Hd. Machine Screw 1

Upper Diaphragm Retaining

b

Ring

2

c Upper Diaphragm 1
d Jam Nut 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
d Ball 1
e Clip 1
f O‑Ring* 1

* Requires thin lm of FS3452 Fluorosilicone
Grease

(a) Repair Parts Kit (a) Includes

Items 5, 6, 8, 10, 11, 23, 27 &
1,5 g of FS3452 92‑311‑1‑116

(b) Replacement Parts Kit (b)

Includes Items 4, 13‑22, 29 &
1,5 g of FS3452 92‑311‑1‑117

(c) Replacement Parts Kit (c)

Includes Items 3, 7, 9, 12, 24‑
26, 28 & 1,5 g of FS3452 92‑311‑1‑118

NR: Not Replaceable

FIGURE 3

MODEL ACC‑1 ACCELERATOR ASSEMBLY

(VENT PLUG)

(RESTRICTION

ACCESS PLUG)

(RESET KNOB)