Service Checklist - Zoeller 600 Series Owner's Manual

ELECTRICAL PRECAUTIONS Before servicing a pump, always shut off the main power breaker to the panel and then disconnect the pump - making
sure you are wearing insulated protective sole shoes and are not standing in water. Under fl ooded conditions, contact your local electric company or a qualifi ed licensed
electrician for disconnecting electrical service prior to pump removal.
Submersible pumps contain oils which become pressurized and hot under operating conditions - allow 2½ hours after disconnecting before attempting service.
CONDITION
A. Pump will not start or run.
Steps Check Voltage At
No. 1 Line terminals in pump's
control panel
L
No. 2 Pump motor terminals in
pump's control panel
T
B. Motor overheats and trips overload or blows fuse.
C. Pumps starts and stops too often.
D. Pump will not shut off.
E. Pump operates but delivers little or no water.
F. Drop in head and/or capacity after a period or use.
If the above check list does not uncover the problem, consult the factory - Do not attempt to service or otherwise disassemble pump.
Service Checklist & Trouble Shooting
- L - L (3 Phase)
1 2 3
- T - T
1 2 3
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If No Voltage
Check Disconnect switch, line
fuse, and/or circuit breakers
in power supply circuit.
Check for control circuit
voltage. Check out magnetic
starter contacts, thermal
overloads, and fl oat switches
- Incorrect Voltage
- Unbalanced power source
- Incorrect motor rotation
- Negative or low head
- Excessive water temperature
- Impeller or seal mechanically bound
- Defective capacitor or relay
- Motor shorted
- Lost one line in a Three Phase unit
- Check valve stuck open
- Level controls out of adjustment
- Thermal overload switch out of
adjustment or defective
- Pit too small
- Debris under fl oat switch
- Float travel obstructed
- Defective or damaged fl oat switch
- Magnetic starter contacts shorted
- Air lock - check vent hole
- Check for plugged Pump housing, discharge
- Vent hole clogged or not drilled
- Discharge head exceeds pumps capacity
- Low or incorrect voltage
- Incorrect motor rotation
- Defective capacitor
- Increase Pipe Friction
- Clogged line or check valve
- Abrasive material & chemical,
If Voltage
Proceed to No. 2
Check starting relay
and capacitor (1
phase units). Check
pump for ground,
and binding impeller
COMMON CAUSES
pipe or sticking check valve
deteriorated impeller and pump housing