Page 2 of 12 FIRECYCLE®III
Integrated Fire Protection System
Mechanical Section - Double Interlock Preaction System - FIRECYCLE®III Release
FM-076E-0-37A
1.3 Placing the system in service
1. Verify that the main water supply valve (D1) is CLOSED.
Verify that the system has been properly drained.
2. Verify that all automatic sprinklers are set and that
inspector's test valves and/or piping auxiliary drain
valves are CLOSED.
3. CLOSE main drain valve (D3). Verify that the manual
emergency release valve (B10) is CLOSED.
4. Air supply must be OPEN (see section DAIR SUPPLY).
5. Establish recommended supervisory pressure to the
system piping network (see paragraph 2.1 NORMAL
CONDITION of the current section and section DAIR
SUPPLY).
6. Maintain air supply (see section DAIR SUPPLY).
Nitrogen generator will come on for nitrogen generation.
7. OPEN priming valve (B1). Verify that the pressure
indicated at the priming pressure gauge (B11) is equal
to, or greater than the pressure indicated at the water
supply pressure gauge (B12).
8. If applicable, reset the release control panel (see
section ECONTROLS). Solenoid valve (F1) should
CLOSE.
9. OPEN flow test valve (B6).PARTIALLY OPEN main water
supply valve (D1).
10. When full flow develops from the flow test valve (B6),
CLOSE the flow test valve. Verify there is no flow from
drip check valve (B7) when the plunger is pushed.
11. FULLY OPEN the main water supply valve (D1).
12. Verify that the alarm test valve (B5) is CLOSED and that
all other valves are in their "normal" operating position
(see paragraph 2.1 NORMAL CONDITION of the current
section).
13. If applicable, reset the release control panel (see
section ECONTROLS).
14. Check and repair all leaks.
15. On new installation, system that has been placed out of
service, or where new equipment has been installed,
trip test the system to verify that all equipment functions
properly (see paragraph 1.7.2 FULL FLOW TRIP TEST of
the current section).
16. Notify the AUTHORITY HAVING JURISDICTION, remote
station alarm monitors, and those in the affected area
that the system is in service.
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.
1.4 System Operation
System water supply pressure enters the priming chamber
of the flow control valve (A1) through the priming line which
includes a normally open priming valve (B1), strainer (B2),
restricted orifice (B3) and spring loaded check valve (B4).
Water pressure is trapped in the priming chamber of the
flow control valve (A1) by a spring loaded check
valve (B4), normally closed solenoid valve (F1), normally
open solenoid valve (F2), pneumatic actuator (F3) and
manual emergency release valve (B10). The pressure in
the priming chamber holds the flow control valve clapper
closed, keeping the outlet chamber and system piping dry.
Air pressure from the system piping network is maintained
through the PORV (B9) (pressure operated relief valve).
1.4.2 In a fire condition
When a FIRECYCLE®detector is activated, the release
control panel activates an alarm through a first initiating
circuit. When an automatic sprinkler fuses, a second
initiating circuit is activated through the low air pressure
switch (E4). When both initiating circuits are activated, it
energizes the normally closed solenoid valve (F1) and
normally open solenoid valve (F2).
Pressure from the priming chamber of the flow control
valve (A1) is released to the open drain manifold faster
than it is supplied through the restricted orifice (B3). The
flow control valve clapper opens to allow water to flow into
the piping network and alarm devices, causing water flow
alarms connected to the alarm pressure switch (C1) and
the optional water motor alarm (C2) to activate. The
PORV (B9) is pressurized, purging the air pressure. When
an automatic sprinkler fuses, water will flow from the
system piping network.
Note: If the FIRECYCLE®detection system operates due to
mechanical damage or malfunction, the flow control
valve (A1) will stay closed.
1.4.3 Cycling discharge stop
Water discharges until all FIRECYCLE®detectors have reset
(cooled below their set point). The release control panel
then activates a soak timer, allowing the system to flow
water for a preset period of time (soak timer).
When the soak timer has elapsed, the release control
panel de-energizes the normally closed solenoid
valve (F1), allowing it to close. The normally open
solenoid (F2) remains energized closed. It rebuilds
pressure in the priming chamber of the flow control
valve (A1), allowing it to close and stop discharge.
Should a FIRECYCLE®detector go into alarm, the release
control panel energizes once again the normally closed
solenoid valve (F1), and the entire discharge cycle repeats.
