Amerex 05605 - Manual (Page 7)

6
MAINTENANCE OF REGULATED WHEELED EXTINGUISHERS
NOTE: Steps R-a thru R-d apply to models with a Regulator. These procedures should be performed only by
professionally trained and qualified service personnel thoroughly familiar with industry service procedures
and safety precautions. All extinguisher and service equipment components, fittings and adapters must
be in good condition and properly connected.
R-a.
Disconnect the regulator from the agent cylinder. Visually examine the regulator and high pressure hose
for signs of damage, corrosion or deterioration. To perform the regulator static pressure, dead set and
minimum pressure flow rate checks. Connect the proper hose service kit Adapter (P/N 01740) to the low
pressure outlet port of the regulator. Connect the service kit Hose Assembly (P/N 01410) and Flow
Chamber (P/N 01250) to the regulator low pressure port adapter.
R-b.
Make sure all service kit connections are secure and that the kit flow chamber valve is closed. Check
nitrogen cylinder pressure to ensure that it is within the acceptable operating pressure range. Hold the kit
flow chamber in one hand and slowly open the nitrogen cylinder (with either the “T” handle operating lever
or by turning the handwheel if so equipped). Observe flow chamber pressure reading to see if it is within
the specified static dead set pressure parameters noted below. The only type regulators used on Amerex
dry chemical regulated wheeled extinguishers were Victor and MECO. Also see Amerex Tech Tip for
Class D Dry Powder Wheeled Extinguisher Pressures.
Regulator Type Model No. Static Dead Set Pressure Minimum Flow Pressure
Victor SR-450L 225 – 245 psi 140 psi
MECO P-600 235 – 255 psi 140 psi
Victor SR-450E 225 – 245 psi 140 psi
WARNING: IF THE PRESSURE READING EXCEEDS THE GIVEN PARAMETERS, QUICKLY
CLOSE THE NITROGEN CYLINDER “T” HANDLE OR HANDWHEEL VALVE AND VENT THE
PRESSURE BY OPENING THE FLOW CHAMBER BALL VALVE. REGULATORS CANNOT
BE FIELD ADJUSTED – THEY MUST BE REPLACED IF FOUND TO BE OUT OF
TOLERANCE.
R-c. Observe the proper regulator static dead set pressure for a minimum of one minute – then fully open the
flow chamber valve for 1-2 seconds and observe the pressure reading to ensure that the flow pressure
does not drop below the minimum specified. Close the nitrogen cylinder valve after the test and vent the
flow chamber pressure by opening the flow chamber valve.
NOTE: Prior to performing minimum flow check, make sure that the nitrogen cylinder valve (“T” handle or
handwheel) is FULLY OPEN so that it does not restrict or alter the flow readings.
R-d
Disconnect the service kit quick connect adapter from the low pressure regulator and reinstall the
regulator securely to the agent cylinder. (THIS STEP IS FOR REGULATED EXTINGUISHERS ONLY)
7. Disconnect the discharge hose from the agent cylinder. Check the couplings, hose and hose
gaskets for damage or deterioration – replace as necessary.
8. To perform an operational integrity check on the discharge hose and nozzle combination:
a. Connect the test kit hose adapter to the female end of the discharge hose.
b. Connect the discharge nozzle shut-off lever and properly secure it.
c. Connect a properly regulated and verified nitrogen pressure source (set to the
extinguisher operating pressure (235-245 psi) to the test kit hose adapter.
d. Slowly pressurize the discharge hose/nozzle assembly to the extinguisher operating
pressure and check for leaks or distortion.