Maintenance
06-236115-001 5-5 October 2014
5-4.3.2 Electric Control Head Test
Electric control heads must be tested semiannually for proper operation. This test can be
performed without discharging the HFC-227ea cylinders. Test one hazard area at a time before
proceeding to the next, as follows:
1. Remove all electric control heads from all HFC-227ea cylinders and nitrogen pilot cylinders
serving the hazard area being tested. Let the electric control heads hang freely from the
flexible electric conduit connections. Leave all pressure operated control heads and pilot ac-
tuation hoses attached to the cylinders.
2. Operate HFC-227ea system electrically. This can be accomplished by actuation of the HFC-
227ea system at the system control panel or by manual operation of an electric pull station.
3. Ensure all electric control heads have operated, that is, the indicator on the electric control
head has moved to the RELEASED position, or in the case of a control head (P/N 82-
486500-010) observe that the actuating pin has moved to the fully actuated position. If
any control heads have not operated, check the circuit for electric continuity to these par-
ticular heads and repeat the test. Replace all damaged heads. Repeat the test if any control
heads have been replaced.
4. Observe the instructions on the caution label attached to each electric control head (P/N
82-486500-010). Replace any damaged heads which fail to reset properly before recon-
necting to cylinders. Reattach all electric control heads to the threaded port on the cylinder
valve or pressure operated control head. Tighten the swivel nut securely. Make certain each
electric control head is in SET position before reconnecting to cylinders. Failure to follow
this procedure will result in accidental HFC-227ea discharge.
CAUTION
All control heads must be removed from HFC-227ea cylinders 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.
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