User's Manual

Maintenance
September 2013 6-6 P/N 81-CO2MAN-001
4. After all cylinders have been weighed, or recharged as may be required, reinstall into the
system following procedures detailed in Paragraph 6-9.
6-4.3 Electric Control Head Test
The electric control head must be tested semi-annually for proper operation. This test can be
performed without discharging the carbon dioxide cylinders. Test one hazard area at a time
before proceeding to the next hazard area as follows:
1. Remove electric control heads from all master carbon dioxide cylinders and nitrogen pilot
cylinders within the hazard area being tested. Let the electric control head(s) hang freely
from the flexible electric conduit connections. Leave all pressure operated control heads,
discharge heads and actuation hoses attached to the cylinders.
2. Operate carbon dioxide system electrically. This can be accomplished by actuation at the
system control panel or by manual operation of an electric pull station.
3. Ensure that each electric control head has operated. Observe that the actuating pin has
moved to its fully “released” position. If any control heads have not operated, check circuit
for electric continuity to these particular heads and repeat test. Replace all damaged
heads. Repeat test if any control heads have been replaced.
4. Replace any damaged head which fails to reset properly. Make certain electric control
heads are in the SET position before reconnecting to the system cylinders. Reattach all
electric control heads to threaded port on cylinder valves. Tighten swivel nuts securely.
Failure to follow this procedure will result in an accidental carbon dioxide discharge.
6-4.4 Pressure Switch Test
Perform pressure switch test as follows:
1. Contact appropriate personnel and obtain authorization for shutdown.
2. Check that hazard area operations controlled by pressure switch are operative.
3. Manually operate switch by pulling up on plunger.
4. Verify that hazard area operations, controlled by the pressure switch, shut down.
5. Return pressure switch to SET position.
6. Reactivate all systems shut down by pressure switch; this includes power and ventilation
systems, compressors, etc.
7. Re-connect any circuits that were disconnected.
CAUTION
All electric control heads must be removed from carbon dioxide and nitrogen
pilot cylinders prior to testing to prevent accidental cylinder discharge.
CAUTION
Electric control heads must be reset manually before reconnecting to the
cylinder valves, to prevent accidental carbon dioxide discharge.
WARNING
If the pressure switch is connected to an electrical release, disconnect the
circuit prior to performing the test.