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1.2. Alarms and Switches Testing
Alarms and switches should be tested at least once a year. Before proceeding to perform any testing or
maintenance ensure that all chlorine has been completely purged from the system and that the chlorine
container valves and inlet manifold piping valves are closed. Please refer to Section III.4.2 for long
term system shut down before performing any of the below procedures. After performing any of these
procedures, then refer to Sections III.1 and III.2 for leak testing and initial start up to resume chemical
feed.
Pressure Switch Testing for Relief Valve Assemblies and Expansion Chamber Assemblies
a. Remove the pressure switches from the pressure relief and expansion chamber assemblies.
b. Apply air pressure at approximately 50 – 100 psi (3 – 7 bar) to each pressure switch to verify
operation.
c. Replace any pressure switches that fail this testing.
d. Install tested pressure switches back into each assembly using an appropriate thread sealant.
Chlorine Gas High Pressure Alarm Testing
a. Remove the pressure transmitter assembly with diaphragm protector from the inner chlorine
chamber top flange.
b. Carefully apply nitrogen pressure, slowly increasing to about 300 psi (21 bar), to verify that the
high chlorine gas pressure alarm will activate at 250 psi (17 bar) on the vaporizer controller.
c. Replace the pressure transmitter assembly if it fails this testing (if the corresponding relay on the
controller fails then take corrective action).
d. Install tested pressure transmitter assembly with diaphragm protector back onto the top flange of
the inner chlorine chamber assembly using an appropriate thread sealant.
Pressure Relief Valve
a. Remove the Pressure Relief Valve.
b. Carefully apply nitrogen pressure, slowly increasing to about 600 psi (41 bar), to verify that the
Pressure Relief Valve will open at 560 psi (39 bar).
c. Replace the Pressure Relief Valve if it fails this testing.
d. Install tested Pressure Relief Valve back onto the assembly.
Water Level Alarm Testing
a. Turn on the vaporizer unit and allow the water to automatically fill the tank.
b. The low water level alarm should be on until the water in the sight glass reaches the low water
alarm level marking.
c. The solenoid should remain open until the water level in the sight glass reaches the high water fill
level marking. Then the solenoid should automatically close.
d. If desired, open the drain valve to bring the water level down to the low fill level to verify that the
solenoid will then automatically open to start refilling water into the tank.
e. If desired, test the water level overfill alarm by manually opening the solenoid valve until the water
level in the sight glass reaches the overfill level. At this level, the overfill alarm should activate.
