ADDITIONAL OPERATIONAL NOTES:
To successfully execute the PRIME PUMP function, the following conditions must be
met:
1. The minimum difference between vacuum measurements made when the pump
is stopped and the pump is running must be greater than 0.5” Hg.
2. The measured running vacuum must be less than 20” Hg
To achieve a successful pump start-up during normal operation, the following condi-
tions must be met:
1. The minimum difference between vacuum measurements made when the pump
is stopped and the pump is running must be greater than 0.5” Hg
2. Current measured running vacuum must be within +/- 3” Hg of reference vacu-
um recorded during the PRIME PUMP function.
3. The running vacuum must be less than 20” Hg
The pump will shut off and the alarm will sound if any of the following conditions
are detected:
1. If the current running vacuum measurement falls 3”Hg below the reference vac-
uum measured during the PRIME PUMP function.
2. If the current vacuum measurement rises 3” Hg above the reference running
vacuum measured during the PRIME PUMP function.
3. If the current vacuum measurement exceeds 20” Hg.
NOTE: The 3” Hg under-suction cutoff may not function in systems where the
pump has a flooded suction (below grade). Example: If normal
running vacuum is less than or equal to 3” Hg.
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