Appendix J of TFP1090 (07/2020)
Summary Instructions (If problems occur, consult full document)
DN65 and DN80, Model DPV-1 Dry Pipe Valve with Standard Alarm Test Valve,
with Model ACC-1 Accelerator
DN80 = 396 mm
193 mm
776 mm
367 mm
DN65 = 416 mm
H
F
B
G
C
D
P
N
A
M
L
E
K
J
S
Q
R
I. Normal Conditions
• The Main Control Valve (A) is opened
and locked, and the Accelerator
Control Valve (S) and Air Supply
Control Valve (K) are open.
• The sprinkler system is filled with air
and is pressurized.
• The Main Drain Valve (F), and Low
Body Drain Valve (L) are closed.
• The Alarm Test Valve (E) is in the
closed position.
• The Pressure Gauge Valves (B) and
(C) are open.
• The Pressure Switch Valve (J) is
open.
• System Air Pressure Gauge (G)
reads downstream air pressure,
Water Supply Pressure Gauge (H)
reads the upstream water pressure,
and Accelerator Air Pressure Gauge
(R) reads the accelerator pressure.
II. Operation
When one or more sprinklers are acti-
vated, the accelerator operates to per-
mit system air pressure into the Dry
Pipe Valve intermediate chamber. Doing
so will immediately overcome the ability
of the system air pressure to hold the
Dry Pipe Valve closed without having
to wait for system air pressure to de-
cay to approximately 20% of the water
supply. The Dry Pipe Valve immediately
opens to permit water flow into the sys-
tem piping and to be discharged from
any open sprinklers. Also, with the Dry
Pipe Valve open, water flows to actuate
the Waterflow Pressure Alarm Switch
(M) and, as applicable, the Water Motor
Alarm.
III. Removing System From Service
Step 1.
Close the Main Control Valve
(A), close the Air Supply Control Valve
(K), and close the Accelerator Control
Valve (R).
Step 2.
Drain the system with the Main
Drain Valve (F) and by opening all auxil-
iary drain valves in the system to make
sure that cross-mains and branch lines
are drained.
IV. Placing the System Back in
Service
Step 1.
Close the auxiliary drain valves
after water ceases to discharge, and
leave the Main Drain Valve (F) open.
Step 2.
Replace the sprinklers that
have operated and the sprinklers close
to the fire.
Step 3.
Push down on the reset knob
(P) to allow the Dry Pipe Valve (D) to
re-seat.
Step 4.
Via the Air Supply Control
Valve (K), pressurize the system with
air to 0,7 bar, and then open and close
each auxiliary drain valves in the sys-
tem piping to drain any remaining water
in trapped sections. Also, partially open
the Low Body Drain Valve (L) to assure
that the riser is completely drained.
Close the Low Body Drain Valve (L) as
soon as water ceases to discharge.
Step 5.
Open the Air Supply Control
Valve (K) to restore the system to the
normal system air pressure.
Step 6.
Reset accelerator (Q) using the
instruction on its resetting label.
Step 7.
Partially open the Main Control
Valve (A), and then slowly close the
Main Drain Valve (F).
Step 8.
Fully open the Main Control
Valve (A) and lock it open.
Step 9.
Reset the fire alarm panel and
notify the central alarm station.
V. Weekly Test
Important:
Prior to closing any valves
or activating any alarms, notify local se-
curity guards and the central alarm sta-
tion if applicable.
Step 1.
Open the Alarm Test Valve (E),
verify that the alarm signal created by
the Waterflow Pressure Alarm Switch
(M) is visible at the fire panel. If appli-
cable, check the sound of the Water
Motor Alarm — it must be clear and
steady.
Step 2.
Close the Alarm Test Valve (E),
verify that the normal supply and sys-
tem pressures are restored. If the sup-
ply pressure is below the normal, use
the instructions from the water supply
to obtain the usual pressure.
Step 3.
Close the Pressure Switch
Valve (J) and verify operation of the low
air pressure Alarm Switch (N).
Step 4.
Return the Pressure Switch
Valve (J) to the normally open position
after verifying that the alarm signal is
visible at the fire panel.
