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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
When utilizing copper tubing, the total length of the pilot actuation line (including any rises or drops) cannot
be greater than 160 ft (48.76 m). When the optional discharge pressure switch is installed into the alternate
outlet port of the remote pneumatic actuation/rack kit or anywhere else along the pilot actuation line, the
distance to its actuation port must be included in the calculation of the total length of the pilot actuation line.
4.1.6.3 Installation Using Schedule 40 Pipe
Schedule 40 pipe provided by the installer may be used to assemble the pilot actuation line as shown in
Figures 4.1.6.3. e Schedule 40 pipe must be 1/4" (8 mm) and comply with the guidelines set forth in
NFPA 17 and Sections 4.1.2 through 4.1.2.5 of this manual.
Janus Fire Systems flex hose assemblies may be used to facilitate connection of the Schedule 40 actuation
piping to the pneumatic actuators, utilizing appropriate 1/4" brass 37° JIC or 45° SAE flare fittings with a
minimum pressure rating of 1200 psig (82.7 bar).
When utilizing Schedule 40 pipe, the total length of the pilot actuation line (including any rises or drops
and including any flex hose assemblies) cannot exceed 25 ft (7.62 m) in length. When the optional discharge
pressure switch is installed into the alternate outlet port of the remote pneumatic actuation/rack kit or anywhere
else along the pilot actuation line, the distance to its actuation port must be included in the calculation of the
total length of the pilot actuation line.
4.1.6.4 Installing Remote Nitrogen Actuation Cylinder
Refer to Figure 4.1.6.4a for cylinder mounting dimensions.
A remote nitrogen actuation cylinder with an electric valve actuator shall not be mounted inside of any
hazardous area. If manual actuation is required inside a hazardous area, a remote nitrogen actuation cylinder
with an electric and manual valve actuator shall be installed outside of the hazardous area and at least one
additional remote nitrogen actuation cylinder fitted only with manual actuation shall be mounted within
the hazardous area.
Tees and/or check valves shall be installed as indicated in Figure 4.1.6.4b when utilizing multiple remote
nitrogen actuation cylinders. ere is no limit to the number of remote nitrogen actuation cylinders that
may be installed as long as:
Each cylinder is isolated via check valves to ensure that each remote nitrogen cylinder is isolated from
one another through the use of check valves so that the flow of actuation pressure from a single nitrogen
cylinder never branches into more than one direction on its path to the agent cylinders AND no
individual run of the remote nitrogen cylinder to the agent cylinders (including any rises or drops and
any runs to a discharge pressure switch) do not exceed the length limitations listed in sections 4.1.6.1,
4.1.6.2, and 4.1.6.3
or
Check valves are not used but the TOTAL length of pipe or hose (including any rises or drops and
any runs to a discharge pressure switch) do not exceed the length limitations listed in sections 4.1.6.1,
4.1.6.2, and 4.1.6.3
Section 4 System Installation
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