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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 6 System Inspection and Maintenance
• Check to be certain the cylinder is securely installed in the bracket with the appropriate fasteners and
that the bracket is at the correct height
• Check all nozzles to make certain they are securely installed on the pipe, aimed properly, not corroded,
not plugged, correct orifice size, correct style, and the discharge pattern is not obstructed.
• Check the condition of the piping to make certain it is properly secured in the hangers and all fittings
are tight.
• Visually inspect the pilot actuation hose for signs of damage, corrosion, abrasions, weather checking, or
aging. If any deficiency is identified the hose shall be replaced or hydrostatically tested.
• Check all warning signs to make certain they are in place, mounted securely, readable, not damaged, and
not obstructed.
• Perform a full functional test of the detection, control, and release system to be certain the sequence of
operation is correct, all detectors function as intended, electric manual release stations operate, abort
switches operate, all electric valve actuators function properly, all alarm devices operate, all doors and
dampers close, HVAC shuts down, and power shuts off to the hazard area. For detailed instructions
follow procedures in the appropriate control system technical manual and consult NFPA 72.
• Reset all electric manual release stations, abort switches, the control panel, and all actuators. After the
control panel has returned to normal with no trouble signals, no supervisory signals, and no alarm signals
and all valve actuators have been reset, reconnect the discharge pipe/hose and reinstall all pneumatic,
electric, and manual valve actuators following the procedures outlined in sections 5.3 through 5.5.
6.2.3 Five Year Maintenance
In addition to the monthly inspection, semiannual maintenance, and annual maintenance, the agent
cylinders shall be thoroughly examined and the system actuation hoses shall be hydrostatically tested every
five years.
All cylinders shall be visually examined in accordance with NFPA 17 and the Compressed Gas Association
Pamphlet C-6. Section 3; except that the cylinders need not be emptied or stamped while under pressure.
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