Appendix A Of Tfp1486 (08/2018) Summary Instructions (If Problems Occur, Consult Full Document) Dn100, Model Dpv-1 Preaction Type B Valve; Operation - Tyco DPV-1 Manual

Appendix A of TFP1486 (08/2018)
Summary Instructions (if problems occur, consult full document)
DN100, Model DPV-1 Preaction Type B Valve
R
Q
S
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 Alarm Test Valve (E) is in the
closed position.
• The Pressure Gauge Valves (B) and
(C) are open.
• The Solenoid Valve (J) is closed.
• 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
Upon automatic fire detection, the
Solenoid Valve (J) will open which re-
sults in opening of the Dry Pipe Valve
(D) to permit the system to be filled with
water. Subsequently, upon sprinkler op-
eration, water is discharged from any
open sprinkler. Also, with the Dry Pipe
Valve open, water flows to actuate the
Waterflow Pressure Switch (M) and, as
applicable, the Water Motor Alarm.
-or-
When one or more sprinklers are acti-
vated, the Accelerator (Q) operates to
permit 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
G C
507 mm 376 mm
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 (S).
Step 2. Drain the system with the Main
Drain Valve (F) and by opening all aux-
iliary drain valves in the system to make
sure that cross-mains and branch lines
are drained.
IV. Returning System to 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. Reset the automatic fire detec-
tion system, which in turn will de-en-
ergize the Solenoid Valve (J) to reset
the Solenoid Valve to a normally closed
position.
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 system
D P
H
B
F
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.
Step 7. Reset accelerator (Q) using
the instruction on its resetting label.
Step 8. Partially
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.
XI. Weekly Test
Note: Prior to closing any valves or ac-
tivating any alarms, notify local security
guards and the central alarm station 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.
839 mm
J
193 mm
open the Main