Janus Mv Series User Manual

Page: 23
MV & LV SERIES ENGINEERED DRY CHEMICAL FIRE EXTINGUISHING SYSTEM
OPERATION, DESIGN, & SERVICE MANUAL
REV C
Document # DOC324
Issued: April 26, 2018
Revised: March 22, 2022
UL FILE # EX27541
2.4.4 Pilot Actuation Check Valve
P/N 10262 (See Figure 2.4.4)
An optional pilot actuation check valve is installed into
the remote pilot actuation tee in order to isolate each
remote pilot cylinder. It is a 1/4 in (8 mm) FNPT by
MNPT check valve, with flow of direction OUT of the
MNPT connection.
The cylinder assemblies shall not be transported with the low-pressure supervisory switch assembly installed.
Remove the low-pressure supervisory switch assembly from the cylinder valve before transporting the cylinder
assembly even if the contents are still under pressure. Refer to Section 4.1.4.2 regarding installation and removal
of the pressure switch assembly.
2.50 in
63.5 mm
Figure 2.4.4 NPT Style Pilot Actuation Check Valve
2.4.5 Explosion-Proof Low-Pressure Supervisory Switch Assembly
P/N 98302 (See Figure 2.4.5)
An optional explosion-proof
low-pressure supervisory switch
is also available. e switch has
an enclosure rating of NEMA
4x, 7, 9 and IP67 and explosion-
proof classifications Class I, Div
I, Group A,B,C,D, Class II,
Div I, Group E,F,G, and Class
III. e contact configuration is
single pole, single throw (SPST) with contacts rated 1.5 Amps at 24 VDC. Should the cylinder pressure drop to
approximately 440 psi (30.3 bar), the switch contacts will close transmitting an abnormal signal to the system control
panel. e low-pressure supervisory switch has 72 inch (1829 mm) leads.
1.25 in
32 mm
6.52 in
166 mm
72 in lead
1829 mm
Figure 2.4.5 XP Low-Pressure Supervisory Switch Assembly
O-Ring
1
(P/N 18582)
1. O-Rings must be ordered in packs of 25 as P/N 98791
Section 2 System Components and Description

Janus Mv Series Specifications

General

Brand	Janus
Model	Mv Series
Category	Fire Extinguisher
Language	English