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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
Section 2 System Components and Description
2.3 Multi-Cylinder Arrangement Components
e following components complete the set up of multiple cylinder arrangements.
2.3.1 Remote Nitrogen Actuation Cylinder
P/N 26311 (See Figure 2.3.1)
In multiple cylinder systems, a remote nitrogen actuation cylinder (RNAC) is
installed and connected to the pilot actuation line. e pilot actuation line then
supplies nitrogen from the RNAC to each dry chemical cylinder. e electric and
manual valve actuators are attached to the remote nitrogen actuation cylinder
via the remote pneumatic actuation/bracket kit so that, upon actuation of the
manual or electric valve actuator, nitrogen pilot pressure is sent from the remote
nitrogen cylinder to the pneumatic actuator installed on each agent cylinder.
e remote nitrogen actuation cylinder is pressurized with nitrogen to 500 psi
(34.48 bar). A pressure gauge is permanently affixed to the base of the cylinder.
e actuation port of the cylinder is fitted with an internal Schrader valve that
is upset when the remote pneumatic actuation/bracket kit is actuated, causing
the cylinder to open. An optional version (P/N 26310) is available with an
additional port below the discharge outlet to allow installation of a low-pressure
supervisory switch (P/N 22946 or 98302)
2.3.2 Remote Pneumatic Actuation/Bracket Kit
P/N 97643 (See Figure 2.3.2)
A remote pneumatic actuation/bracket kit is installed with the
remote nitrogen actuation cylinder to both support the cylinder
and to allow the actuation of the cylinder through the electric or
manual pneumatic actuators. A pressure inlet port at the base of the
remote pneumatic/actuation bracket kit fits onto the actuation port
of the remote nitrogen cylinder, while the electric valve actuator is
installed onto the actuation port on the top of the remote pneumatic
actuation/bracket kit. Upon actuation of the electric valve actuator via
the control panel or manual valve actuator, the pin inside the electric
valve actuator causes the actuation pin of the remote pneumatic
actuation/bracket kit to actuate, upsetting the Schrader valve inside
the actuation port of the remote nitrogen actuation cylinder. e
actuation pin must be manually reset by pushing the pin up until it snaps
into the “up” position.
Attaching the remote pneumatic actuation/bracket kit to the remote nitrogen actuation cylinder when the actuation
pin is not fully locked into the “up” position may cause the cylinder to actuate, resulting in potential injury and/or
property damage.
e remote pneumatic actuation/bracket kit has two 1/4 in (8 mm) FNPT pressure outlet ports on either
side of its body. One is used to connect to agent cylinders via the pilot actuation line, while the other is used
to install the optional discharge pressure switch. e kit comes with one male NPT x JIC adapter fitting to
facilitate the attachment of flex hose and a plug in the optional discharge pressure switch connection port.
Figure 2.3.1 Remote Nitrogen
Actuation Cylinder
Figure 2.3.2 Remote Pneumatic
Actuation/Bracket Kit
Actuation
Connection Port
Shipped with
Cap
Outlet Port
(for Optional
Discharge
Pressure Switch
Connection)
Shipped with Plug
Actuation
Connection
Port
Cylinder
Strap
Actuation
Connection Port /
Discharge Outlet
Pressure
Gauge
Outlet Port
Shipped with
Male NPT x JIC
Adapter
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