Page: 56
FM-200® OPERATION, DESIGN, & SERVICE MANUAL
Revision F
Document # DOC102
Issued: February 1, 2009
Revised: 11-Nov-2011
40YE
Section 4 System Installation
4.1.3 Installing Nozzles
Nozzle type, style, and orice diameter are determined based upon ow calculations made by the Janus Design
Suite® software during the system design. Discharge nozzles are female NPT thread and must be installed as
designed according to the guidelines covered under section 3.5.
Due to the thrust generated from a 90° corner or 180° sidewall nozzle, a rigid hanger or support must be located
within 12 in (305 mm) of the nozzle to prevent pipe movement and/or nozzle rotation during discharge.
Dirt traps and blow-outs are not required per NFPA 2001. If installed, Janus Fire Systems recommends they
consist of a tee with a capped nipple 2 to 6 inches (51 to 152 mm) long, installed at the end of each pipe run.
4.1.4 Installing Cylinder Assembly
Position the cylinder assembly against the back channel so that the pressure gauge faces out.
Secure the mounting strap into the back channel with the bracket held horizontally. Fasten the strap with the
supplied 3/8"-16 1-1/4" cap screw and 3/8" twirl nut.
4.1.4.1 Installing Pressure Gauge Assembly (Mv and Lv Series only)
Prior to installing the pressure gauge assembly, both the o-ring on the assembly connection and the inside
of the pressure gauge connection on the cylinder valve must be lightly lubricated with Molykote 55 by Dow
Corning (P/N 19056) or equivalent.
Install the pressure gauge assembly into the pressure gauge connection and tighten the swivel nut to 10 lb*ft.
When the swivel nut is almost tight, the pressure gauge assembly will upset the Schrader valve. e O-ring on
the pressure gauge assembly immediately seals to prevent loss of FM-200®.
Once the pressure gauge assembly is connected, it should be used to check the pressure inside the cylinder.
A pressure drop of more than 10% indicates the cylinder assembly must be recharged or replaced. Pressure
should be 360 psig (24.8 bar) at 70°F (21°C). Refer to Table 6.2.1.1 in Appendix B for normal pressures at
other temperatures.
Every time the pressure gauge assembly is removed from the cylinder valve, the assembly o-ring must be
replaced with a new o-ring (P/N 98791 - Pack of 25). Prior to re-installing the pressure gauge assembly, both
the new o-ring and the inside of the pressure gauge connection on the cylinder valve must be lightly lubricated
with Molykote 55 by Dow Corning (P/N 19056) or equivalent.
4.1.4.2 Installing Low-Pressure Supervisory Switch Assembly (Mv and Lv Series only)
Prior to installing the low-pressure supervisory switch assembly, both the o-ring on the assembly connection
and the inside of the pressure gauge connection on the cylinder valve must be lightly lubricated with
Molykote 55 by Dow Corning (P/N 19056) or equivalent.
Install the low-pressure supervisory switch assembly into the low-pressure supervisory connection and
tighten the swivel nut to 10 lb*ft. When the swivel nut is almost tight, the low-pressure supervisory switch
assembly will upset the Schrader valve. e O-ring on the low-pressure supervisory switch assembly
immediately seals to prevent loss of FM-200®.
Every time the low-pressure supervisory switch assembly is removed from the cylinder valve, the assembly
o-ring must be replaced with a new o-ring (P/N 98791 - Pack of 25). Prior to re-installing the slow-pressure
supervisory witch assembly, both the new o-ring and the inside of the pressure gauge connection on the
cylinder valve must be lightly lubricated with Molykote 55 by Dow Corning (P/N 19056) or equivalent.
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