Vaporless ISM-4080, Руководство по установке и эксплуатации

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8. Read Operating Pressure
Authorize the dispenser. The pump will start running. Watch for the pump to achieve operating pressure
as seen on the right-hand pressure gauge. Note this pressure reading on the LDT-890 Test form and then
remove the authorization from the dispenser.
9. Reduce Line Pressure to Zero
With the large beaker under the discharge port, set the test unit’s selector to the DISPENSER NOZZLE
position. Fuel will begin to flow into the beaker. After the reading on the right-hand pressure gauge falls
to zero, set the test unit’s selector to the GPH TEST position and authorize the dispenser.
10. 3 GPH Leak Detector Test
With the dispenser authorized, the pump will start running. With the selector in the GPH TEST position a
3 GPH leak has been introduced to the system. On the right-hand pressure gauge watch for the pump to
build pressure. If the mechanical leak detector is properly calibrated this pressure should not reach the
normal operating pressure previously observed. Note this lower pressure value here. Remove the
authorization from the dispenser.
11. Reduce Line Pressure to Zero
Set the test unit’s selector to the DISPENSER NOZZLE position. Fuel will continue to flow into the
beaker. After the reading on the right-hand pressure gauge falls to zero, set the selector to the GPH TEST
position and again authorize the dispenser.
12. Leak Test Confirmation
With the dispenser authorized, the pump will start running. Again, note that with the selector in the GPH
TEST position a 3 gph leak has been introduced to the system. Watch the right-hand pressure gauge as the
pump builds pressure. The pressure should build to the value noted in Step 10.
TECHNICAL NOTE — If on either test, the pressure indicated on the right-hand pressure gauge does
not stabilize at the lower pressure, but rather steps through to the higher normal operating value, the leak
detector has failed the leak test. Adjust the LD-2000 or LD-3000 to detect a leak consistently. The VMI
Piston Switch will have to be removed to complete this adjustment. Contact VMI for LD-2000 or LD-
3000 adjustment instructions if needed.
After the LD-2000 or LD-3000 has been properly adjusted to detect the leak, and the Piston Switch has
been reinstalled, turn the selector to the PRESSURE STEP TEST position. Reauthorize the pump.
Following a short delay, the pressure should step up to the value noted in Step 8. This is the indication that
the mechanical leak detector has properly transferred from its leak test position to its full flow position.
13. Auto-Repressure Test
Remove the dispenser authorization. With the large beaker under the discharge port, set the selector to the
DISPENSER NOZZLE position. Fuel will flow into the beaker. After the reading on the right-hand
pressure gauge falls to zero, set the selector to the PRESSURE STEP TEST position.
14.
Re-Enable Repressurization Feature by adjusting REPRESSURE DISABLE END TIME from 23 to
00, the original time setting (reference page 10 above).