Maintenance
April 2020 6-6 06-237619-001
6-6 SEMI-ANNUAL INSPECTION PROCEDURE
In addition to performing the monthly inspection, perform the following procedures semi-
annually:
6-6.1 System Lockout Valve (if Fitted)
The ball valve should be manually operated and the operation of the micro-switch (if fitted)
observed.
1. Signal to be initiated on control panel.
2. Replace the micro-switch if found to be defective.
6-6.2 Actuator on Selector Valve
1. Operate the valve manually by the use of the emergency handle. The handle should move
freely when opening and closing the valve.
2. Close the selector valve and store the emergency handle in a convenient place
Should for any reason the unit fail to operate as intended or should there be any doubt about
the opening/closing of the valve, contact Kidde Products Ltd or authorized representative.
Never attempt to modify the actuator assembly (i.e. never open the actuator).
6-6.3 Distribution Pipe Work and Nozzles
All pipe work and nozzles should be visually inspected for any signs of damage, deterioration
or obstruction. Nozzles should be checked for any signs of blockage and cleaned out if
appropriate. Any paint or lacquer shall be removed.
6-6.4 Protected Room
Inspect the protected room thoroughly to determine if any changes to the volume, new
penetrations, leakage rate etc. have occurred which could adversely affect extinguishing
performance of the system and/or require additional pressure relief openings to be installed.
Operation of pressure relief opening devices together with unobstructed flow to free air shall
be verified.
Where the integrity inspection reveals changes to the enclosure for which the system originally
was designed that could result in failure to maintain the extinguishing concentration, they shall
be corrected or the system redesigned to provide the original degree of protection.
Should additional equipment have been introduced resulting in a higher required
concentration, pressure relief openings may have to be increased.
6-6.5 Test Discharge Pressure Switches
Discharge pressure switches must be tested semi-annually for proper operation.
1. Contact the appropriate personnel and obtain authorization for a shutdown.
2. Ensure that the hazard area operations controlled by the pressure switch are operative.
3. Manually operate the switch by pulling up on the plunger and verify that the hazard area
operations controlled by the pressure switch shut down.
4. Return the pressure switch to the SET position.
5. Reactivate all systems that were shut down by the pressure switch (such as power, venti-
lation systems and compressors).
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