PN 05605
04/2020
TROUBLESHOOTING GUIDE
WARNING: BEFORE ATTEMPTING TO CORRECT ANY LEAKAGE PROBLEM, BE SURE THAT THE
AGENT CYLINDER IS COMPLETELY DEPRESSURIZED. Always use caution when opening
the shutoff nozzle or any other connection as a leaking nitrogen cylinder valve seat may
have pressurized the agent cylinder. Refer to the recharge procedure for proper method
of depressurization.
PROBLEM
CORRECTIVE ACTION
1.
Nitrogen
cylinder
gauge
reads low or high
Temperature may have affected the pressure reading
Temperature (F)
35º
70º
120º
Temperature (C)
2º
21º
49º
Recommended Pressure
psi
1880
2015
2200
MPa
13.0
13.9
15.2
Minimum Pressure
psi
1590
1700
1900
MPa
11.0
11.7
13.1
NO CORRECTIVE ACTION IS REQUIRED IF THE PRESSURE
IS WITHIN PARAMETERS STATED ABOVE.
2.
Nitrogen pressure is too low.
Valve is closed. Tamper seal
is intact. There is pressure in
the agent and nitrogen
cylinders.
Valve seat has leaked and has pressurized the agent cylinder.
Follow Recharge Procedure for restoring the extinguisher to
service.
3.
Nitrogen pressure is too low.
Valve is closed. Tamper seal
is
intact.
No
pressure
observed
in
the
agent
cylinder.
Leakage in the nitrogen valve at other than the valve seal.
Replace with a properly charged nitrogen cylinder.
4.
Shutoff nozzle does not move
freely.
Disassemble, clean, and lubricate.
5.
Unable to remove the agent
cylinder cap.
Agent cylinder may be pressurized. Make no further attempt to
remove the cap until this is checked. See the Recharge
Procedure for proper depressurization method.
6.
Nitrogen hose cut, cracked or
abraded.
Replace hose assembly.
7.
Chemical agent and pressure
leaking from the safety disc
assembly. (Models 450, 451,
452)
Inspect safety outlet for tightness or damage. Tighten if
necessary. NOTE: Only tighten the large hex nut of the
assembly. The small round nut containing the holes is factory set
to a specific torque value. Do not attempt to adjust. If damaged
or ruptured, replace complete Amerex Safety Disc Assembly.
