Davey Sump Pump DT37KZN, DT55KZN, DT75KZN, DT110KZN, DT150KZN, DT220KZN - Manual (Page 4)

If the pump is operating in the reverse, the power connections must be changed by an electrician.
Once correctly connected and installed with water in the pit etc, the electrician should also check for correct power usage,
phase balance and general electrical integrity of the installation.
Fault checks
(a) Pump will not start:
(1) Manual type
• Check to ensure power is available and the outlet is switched ON.
• Blown fuse or tripped circuit breaker (replace/reset or call an electrician).
• If an extension lead is fitted, check connection.
• Impeller jammed - disconnect from power supply, and ensure impeller is free to rotate.
• Thermal cut-out switch has not reset (wait until reset or reset overload for 3 Ø).
• If pump does not start from new then the seal has possibly stuck due to the length of time it has been
standing since it was manufactured. In this case, disconnect from power supply, remove bottom strainer
and turn the impeller nut clockwise, this will release the initial friction on the seal and once the power is
connected will allow the pump to work.
(2) Auto Type (with float switch)
• Check all in (1) above.
• Float switch jammed against sump side wall.
• Insufficient liquid to place the float switch in the ON position, i.e. higher than the horizontal.
(B) Pump runs, but does not pump water or pumps insufficient water:
• Check for correct direction of rotation (3 Ø only).
• Insufficient liquid in sump.
• Strainer, impeller and/or discharge pipework blocked.
• Impeller damaged.
• Air lock in discharge pipework. Ensure pump is filled with water.
• Excessive back pressure or lift.
(c) Pump will not stop:
(1) Manual type
• Must be switched off at the power supply.
(2) Auto Type (with float switch)
• Float switch is prevented from moving to the fully down position.
• Float switch may be faulty.
4 5
(d) Pump runs for short periods only (the overload protection has tripped):
• Some foreign body is clogging the impeller.
• The liquid temperature is too high.
• Electrical fault.
Do not run the pump dry as this will damage the seal and reduce the life of the pump.
Where hair, lint or other string-like material may be in the water, the pump should be regularly checked. It might become
necessary sometimes to clean the suction strainer, impeller and/or discharge pipework.
With simple cleaning and regular examination this pump should give reliable service.
Maintenance
The oil in the seal chamber should be periodically checked and replaced. This work should be done by a suitably
qualified Davey Service Dealer every 2,000hrs of operation or every 12 months, whichever occurs first.
GRINDER MODEL comes with in-built seal cavity sensors fitted. These sensors may be connected to a sensor
relay to provide motor protection in the event of seal failure. If you do not require the seal sensor function,
simply fix and isolate the sensor lead in a weatherproof enclosure.
note:
1. Long extension leads should be avoided as they often have insufficient current carrying capacity to run
electric motors, hence they can cause substantial voltage drop and operating problems.
2. Minimum voltage at the electric motor must not fall below 216 Volts for single phase, otherwise motor dam-
age may result which is not claimable under guarantee.
3. If the electrical fittings in your country make it necessary to remove the plug (where fitted) from the lead
fitted to the motor, care should be taken to ensure that the earth conductor green/yellow in the lead is
properly connected to a good earth. This work should be undertaken by a suitably qualified person.
4. expansion and contraction inside the motor due to heating and cooling is vented via the lead. the lead end
must never be sealed off, but must always be open to the atmosphere.
5. three phase installations MuSt always be phase balanced to within 5% variation.
6. ensure all three phase models rotate anti-clockwise when viewed from the bottom or pump end.
note:
If fitting an extension lead a QUALIFIED ELECTRICIAN should be consulted to ensure correct rating is
provided. extension leads are not allowed for permanent installations.
When using a phase indicator, please consult the manual of the unit before usage.
WarnIng: When servicing or attending pump, always ensure power is switched off and lead unplugged.
Electrical connections should be serviced only by qualified persons. If the electrical supply lead of this pressure
system is damaged, it must only be replaced by authorised davey service personnel as special tools are required.