Symptom Possible Cause Check Or Remedy
Excessive leakage around the
pump shaft while operating
Worn seal or packing Replace seal or packing.
Pump performance poor
Worn impeller or seal Replace with new impeller or seal.
Suction lift too high Relocate pump closer to supply.
Motor not up to
speed; low voltage
Larger lead wires may be required. Check for proper line
voltage,±10%.
Worn bearings Replace pump.
Pump has noisy operation
Worn motor bearings Replace pump.
Low discharge head Throttle discharge -- improve conditions
Debris lodged in
impeller
Remove cover and clean out.
Cavitating pumps Adjust system pressures.
Pump discharge pressure too
high
Throttling valve
improperly set
Reset valve to proper differential pressure.
Valve closed in circuit Open all valves downstream of unit.
Strainer clogged or
dirty
Remove strainer plug and clean.
Pump will not operate or no
coolant flow
No power to pump
motor
See Unit will not operate on the previous page in this table.
Low coolant level Check coolant level.
Tubes plugged in
cooling coil
Flush coil with reputable cleaner.
Valve closed
downstream of
cooling unit
Open all valves.
Strainer clogged or
dirty
Remove strainer plug and clean.
Pump cavitating
(erratic gauge
operation)
Possibility of air in lines. Bleed all components. Check surge
tank to pump inlet connection. Check for piping restrictions.
Table 8.1 Troubleshooting Symptoms and Checks (continued)
Vertiv | Liebert® Drycooler Installer/User Guide
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