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Zi/c SstMcs. ANc. 6. 7. 8. 9. 10. 11. 12. 13. A delay of 10 to 15 seconds is allowed for this pressure bleeding to occur. Energize the normally closed solenoid valve SV9 which allows the process water to flow into the water tank. When the water tank becomes full, a large change in pressure as measured by pressure transducer DP3 will occur. When this signal is received, solenoid valve SV9 is de-energized which stops the process water flow. De-energize solenoid valve SV7 which allows the 02 side of the water tank to be slowly repressurized through the restrictor in parallel with the check valve. A delay of 10 to 15 seconds is allowed for this repressurization to occur. De-energize solenoid valve SV8 which allows water to again flow to the module water feed cavity. Return the module current to the original value as set by the front panel control. Two minutes later remove the automatic reset on all monitor PC cards. The six-hour timer is reset and a new time period started. 14. Shutdown Sequence 1. Either operating the manual SHUTDOWN pushbutton or receiving a mal- function signal from the monitor circuits will initiate a shutdown sequence. 2. If a fill cycle is in progress, the cycle will be allowed to be com- pleted as described above, except Steps 12, 13, and 14 will not be executed. If it was not in a fill cycle, the current is turned off and the fill cycle timer is disabled. 3. The coolant pump is turned off. 4. Solenoid valve SV4 is opened. This allows the water (system) pressure to drop slowly to atmospheric through a check valve. 5. When the water pressure reaches about 1 psi above atmospheric, solenoid valves SV3, SV5, and SV6 are opened. This initiates a N2 purge of the 02 and H2 cavities in the module. Al-2PDF Image | WATER ELECTROLYSIS MODULE
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