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T
OTAL
P
AC
2 Integrated Fire Protection System
Cycling Wet Pipe Systems
FM-072G-0-143 E
valve). Consider installation of auxiliary vents to facilitate
venting.
Placing the system in service
(Refer to mechanical trim description and TRIM
SCHEMATIC)
All initiating devices (detectors), indicating appliances and
releasing devices must be compatible and approved for use
with the Firecycle
III System. Refer to CONTROLS
SECTION for the list of compatible devices.
1. Verify that the system has been properly tested.
Emergency Release Valve
(B10)
should be OPEN.
2. SLOWLY OPEN and secure the system Main Water
Supply Control Valve
(D1)
. Consider venting any
trapped air in the system.
3. CLOSE the Emergency Release Valve
(B10)
.
4. Verify that the Alarm Test Valve
(B5)
is CLOSED and
that all other valves are in their "normal" operating
position (Refer to TRIM SCHEMATIC for details).
5. Open
Firecycle
III control Panel and press "RESET".
Release solenoid valve
(F1)
should open.
6. On new installations, systems that have been placed
out of service, or where new equipment has been
installed, trip test system to verify that all equipment
functions properly. Refer to MAINTENANCE –
ANNUALLY for instructions.
7. After completing the trip test, perform MAINTENANCE
– SEMI-ANNUALLY.
Note:
When a valve has been removed from service and is
subject to freezing or will be out of service for an extended
period of time, all water must be removed from the priming
chamber, trim piping, water supply piping and any other
trapped areas.
Mechanical Trim Section
1. System Operation
In the SET condition:
System water supply pressure enters the priming chamber
of the Flow Control Valve
(A2)
through the ¼" (8mm)
priming line which includes a strainer
(B2)
, a restricted
orifice
(B3)
and a spring check valve
(B4)
. Normally open
solenoid valve
(F1)
allows priming water to escape so that
the Flow Control Valve
(A2)
will not set, but remain open,
filling the system with water.
In a fire condition:
In a fire condition, when the detection system operates,
system Control Panel activates an alarm and energizes
normally closed Solenoid valve
(F2)
open and normally
open Solenoid valve
(F1)
closed.
Pressure is released from the priming chamber to open
drain manifold faster than it is supplied through the
restricted orifice
(B3)
. The Flow Control Valve
(A2)
clapper
remains fully open to allow water to flow into the system
piping and activate alarm devices, including a water flow
Alarm Pressure Switch
(C1)
.
Water will immediately flow from any sprinklers which may
have operated. Water Flow Alarm Switch
(C1)
activates,
latching normally open solenoid valve
(F1)
closed. Water
discharges until all Firecycle Detectors have reset (cooled
below their set point). After all detectors have reset, the
control panel activates the "Soak Timer" allowing the
system to continue discharging water for a preset time
period.
When the Soaking Timer has expired, the control panel de-
energizes normally closed Release Solenoid Valve
(F2)
,
allowing it to close. (The normally open Release Solenoid
Valve
(F1)
remains energized closed until the control panel
is manually reset, or both the AC power and battery
backup have failed).
The Flow Control Valve
(A2)
re-primes and closes,
stopping the flow of water through the system piping.
Should a Firecycle
detector go into alarm at this time, the
control panel re-energizes normally closed release
Solenoid valve
(F2)
open, and the entire cycle repeats.
Trouble conditions:
- False alarms – If water pressure surges produce false
alarms check if air is trapped in the sprinkler piping.
Trapped air can cause false alarms, the alarms to cycle on
and off during testing and other nuisance problems. To
correct bleed as much air as possible from the trapped
high points of system piping. This condition can be
minimized by opening the remote inspectors test valve and
slowly filling the system with water when placing the
system in service.
If the detection system is damaged or malfunctions, the
Firecycle
III Control panel will go into alarm and the flow
control valve will open. Water will not flow from any
sprinklers until a sprinkler has operated, as in a fire. The
cycling function of the Firecycle III
®
will not operate in this
condition and the system must be manually shutoff. All
alarms will operate normally.
If the piping system is damaged sufficiently to activate the
Water Flow Alarm Switch
(C1)
, the control Panel will
energize normally open Release Solenoid Valve
(F1)
closed. Because a detector has not gone into alarm mode,
release Solenoid Valve
(F2)
will remain non-energized
closed. The Flow Control valve
(A2)
will re-prime and
close after a short delay. This feature ensures that should
a sprinkler or the system piping become damaged, the
amount of water which will discharge is limited by the
system pressure and the location of the system damage.
Should a Firecycle
detector detect a fire during this
condition, normally closed Release Solenoid valve
(F2)
will
be energized open, allowing the Flow Control valve
(A2)
to
open, and water will be discharged from any sprinklers
which may have operated as a result of the fire, as well as
from the damaged portion of the system and all alarms will
operate normally in this condition.
If the AC power fails, the Firecycle
III System continues
to operate on the standby batteries. Should both AC and