17
Reset the ISM using the RESET> ENTER push-buttons to initialize the repressure cycle. The pump will
start running. Immediately return to the dispenser.
On the right-hand pressure gauge of the LDT-890, verify that normal operating pressure has been achieved.
If the
REPRESS RETRIES
has been set to 2 or more cycles, the system may cycle 2 or more times to
reach the normal operating pressure (full pump pressure).
15.
At the end of the pump REPRESS cycle, the ISM will automatically turn off the pump.
IMMEDIATELY AFTER THE PUMP SHUTS OFF, set the selector on the LDT-890 to the GPH TEST
position. This will introduce a 3 GPH leak to the system. This leak may be introduced with the pump
running during the REPRESS CYCLE AS LONG AS THE LEAK DETETOR HAS STEPPED
THROUGH TO FULL FLOW.
On the right-hand pressure gauge of the LDT-890, verify that the pressure falls due to the 3 GPH leak. If
the proper delay has been entered, the pressure should fall to zero before the next Repressurization Cycle
is started.
16.
At the end of the delay timing cycle, the ISM will automatically turn on the pump. Pressure will begin
to build but will stop at the value observed in Step 10 indicating that the leak detector has found the 3
GPH leak. If the
3GPH RETRIES
is set to two or more cycles, the ISM Controller may retest 2 or more
times. The ISM-4080 controller should recognize the line leak after the cycles are completed, shutdown
the STP, and Alarm. This successfully completes the ISM test.
17. Disconnect LDT-890 Test Unit
Turn off the pump’s power breaker. Reprogram the repressurization disable time or turn off power to the
ISM to disable the repressure cycle.
18.
With the large beaker under the LDT-890 discharge port, set the selector to the DISPENSER NOZZLE
position and bleed off fuel until the reading on the right-hand pressure gauge is zero.
19.
Remove the LDT-890. Before re-energizing pump, ensure system is returned to tight status.
20. Full System Operation
Turn on the power breaker. If required, restore power to the ISM. Press the RESET > ENTER push-
buttons to reset all channels. This completes the test procedure. The system including the ISM-4080
Integrated Shutdown Module is now fully functional.
Summary of Contents for ISM-4080
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