F
IRE
F
LEX
®
N
2
B
LAST
®
Integrated Fire Protection System
O
WNER
'
S
O
PERATION
&
M
AINTENANCE
M
ANUAL
FM-076B-0-6A
Page 15 of 25
4.10 OPTIONAL SHUT-OFF VALVE AND SIGHT GLASS
The shut-off valve & sight glass option is intended to be
used for applications where testing of the system operation
without filling the sprinkler piping network is desirable and
where it is critical that all functions of the preaction system
be tested under actual discharge conditions.
Operation of the shut-off valve
Inspection of the system can be implemented without filling
the sprinkler piping system with water.
1. CLOSE the shut-off valve
(D4)
.
2. OPEN the main drain valve
(D3)
.
3. Simulate
the
operation
of the system to open the
deluge valve
(A1)
(refer to chapter
4.8.6 ANNUAL
INSPECTION). Verify that water flows through the
sight glass assembly
(D5)
.
4. Once tests are completed, make sure the main drain
valve
(D3)
is completely CLOSED. Reset the system
(refer to chapter 4.6 PLACING THE SYSTEM BACK IN
SERVICE AFTER OPERATION).
5. FULLY OPEN the system shut-off valve
(D4)
. Reset
the remote releasing control panel.
Figure 4.7 - Shut-off valve option
Main Drain
Valve (D3)
Deluge (A1) or
Flow Control (A2)
Valve
Supervised
Shut-off Valve (D4)
Sight Glass
Assembly (D5)
Riser Check
Valve (D2)
Point flash light here
Supervised
Water Supply
Control Valve (D1)
FM-061H-0-75B
4.11 OPTIONAL SEMI-FLANGED INLET/OUTLET
When required by the user,
F
IRE
F
LEX
®
N
2
Blast
®
unit
can be provided in a semi-flanged configuration.
The semi flanged option provides flanged fittings only
on the water inlet pipe (left side) and on the system
riser outlet. The drain manifold is provided with a
threaded connection (left side). The rest of the fittings
are the same as usual with the main components being
provided in the standard flanged / grooved
configuration.
Figure 4.8 - Semi-flange option
Flanged fitting outside cabinet
(when provided)
Field connection
to Water Supply
(specify side)
Threaded end
Field Connection
to Open Drain
(specify side)
Flanged fitting outside cabinet
(when provided)
FM-061H-0-77B
