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Appendix G of TFP1090 (07/2020)
Summary Instructions (if problems occur, consult full document)
DN65 and DN80, Model DPV-1 Dry Pipe Valve with Three-Way Alarm Test Valve,
with Model ACC-1 Accelerator
R
Q
S
J
K
M
E
L
A
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 Three-Way Alarm Control Valve
(E) is in the open 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.
G
C
422 mm
367 mm
III. Removing System From Service
Step 1. Close the Main Control Valve
(A), close the Air Supply Control Valve
(K), close the Accelerator Control Valve
(R), and place the Three-Way Alarm
Control Valve (E) in the closed position.
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. Place the Three-Way Alarm
Control Valve (E) in the open position.
Step 3. Replace the sprinklers that
have operated and the sprinklers close
to the fire.
Step 4. Push down on the reset knob
(P) to allow the Dry Pipe Valve (D) to
re-seat.
Step 5. 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 6. Open the Air Supply Control
Valve (K) to restore the system to the
normal system air pressure.
D
P
H
B
F
N
776 mm
185 mm
Step 7. Reset accelerator (Q) using the
instruction on its resetting label.
Step 8. Partially open the Main Control
Valve (A), and then slowly close the
Main Drain Valve (F).
Step 9. Fully open the Main Control
Valve (A) and lock it open.
Step 10. 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. Place the Three-Way Alarm
Control Valve (E) in the test position,
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. Place the Three-Way Alarm
Control Valve (E) in the open position
and verify that the normal supply and
system pressures are restored. If the
supply pressure is below the normal,
use the instructions from the water sup-
ply 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.
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