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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 4 System Installation
4.1.6 Installing Pilot Actuation Line
On a multiple cylinder system, a remote nitrogen actuation cylinder is connected to each cylinder with the
pilot actuation line. Flex hose and fittings necessary to assemble the pilot actuation line can be ordered from
Janus Fire Systems, but the pilot actuation line may also be assembled using copper tubing or schedule 40
pipe provided by the installer. Refer to Sections 4.1.6.1 through 4.1.6.3 for requirements to each specific
type of pilot actuation line arrangement.
Up to 16 cylinders can be actuated simultaneously on a single system using a single remote nitrogen actuation
cylinder and following the limitations of actuation line length found in Sections 4.1.6.1 through 4.1.6.3.
e pilot actuation line connects to each cylinder at a 1/4 in (8 mm) female NPT inlet port in the pneumatic
valve actuator. One pneumatic valve actuator is required for each cylinder.
A vent check must be installed in the pilot actuation line downstream of the remote nitrogen actuation
cylinder, typically at the last cylinder. It is used to bleed off pressure that may accumulate in the pilot
actuation line, reducing the chance of inadvertent operation of the pneumatic valve actuators. e vent
check contains a ball seat that seals the vent check during the rapid pressure accumulation of an actual
discharge.
Before assembling the pilot actuation line, all hose, tubing, pipe and/or fittings should be carefully cleaned
internally to remove all oil, dirt, or foreign material.
Teflon tape or joint compound must be used on all threaded connections in the pilot actuation line. Use care
when applying pipe tape or joint compound so they don’t enter the pipe. Do not use pipe tape or compound
on flared fittings.
4.1.6.1 Installation Using Flex Hose
Janus Fire Systems flex hose assemblies may be used to assemble the pilot actuation line as shown in Figures
4.1.6.1a, 4.1.6.1b, and 4.1.6.1c. e appropriate length of flex hose for each cylinder assembly size is shown
in Table 2.3.9. All fittings necessary to complete the pilot actuation line are available from Janus Fire
Systems and are describe in Section 2 of this manual. Any other fittings utilized must be appropriate 1/4"
brass 37° JIC fittings with a minimum pressure rating of 1200 psig (82.7 bar).
When utilizing flex hose, 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.
4.1.6.2 Installation Using Copper Tubing
Copper tubing and appropriate fittings provided by the installer may be used to assemble the pilot actuation
line as shown in Figures 4.1.6.2. Copper tubing must be 1/4" O.D. with a 0.030" wall thickness (meeting
ASTM B280). All fittings utilized must be appropriate brass or steel compression style fittings (with brass
or steel sleeves or ferrules) or SAE 45° flared tube fittings with a minimum pressure rating of 1200 psig
(82.7 bar).
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