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WARNING : The pump and associated
pipework operate under pressure.
Under no circumstances should the
pump or associated pipework be
disassembled unless the internal
pressure of the unit has been relieved.
Failure to observe this warning will
expose persons to the possibility of
personal injury and may also result
in damage to the pump, pipework or
other property.
WARNING: Failure to follow these
instructions and comply with all
applicable codes may cause serious
bodily injury and/or property damage.
READ ALL INSTRUCTIONS BEFORE
INSTALLING YOUR NEW DAVEY PUMP
1. Introduction
These instructions have been prepared to
acquaint you with the correct method of installing
and operating your Davey pump. We urge you
to study this publication carefully and follow its
recommendations. In the event of installation
difficulties or the need for further advice you
should contact the Davey Dealer from whom you
purchased the unit.
2. Housing Your Davey Pump
As the pump is an electrical apparatus it must
be protected from the weather, at the same time
adequate ventilation must be provided for the motor.
Do not enclose the pump in such a manner that a
“hotbox” condition is created. Ventilation should be
provided near the top of any enclosure to prevent a
“buildup” of condensation. The maximum ambient
air temperature must not exceed 40oC.
Your pump should be mounted on a firm base
enough to prevent any surface water from flooding
the unit. Positioning of the unit should allow the
nameplate to be easily read and provide adequate
access for service purpose.
Failure to adequately house your pump, as outlined
above, will render your guarantee void.
3. Suction Lift
For best performance and easiest priming, site the
pump as close to the water source as possible.
Optimum performance will be achieved on suction
heads (including friction) up to 4.5m (15 feet). The
maximum practical suction head (including friction)
for this type of pump is 7.5m (25 feet).
4. Delivery Head
Care should be taken to ensure that the combined
suction and delivery head (including pipe friction) of
the installed pump does not exceed the total head
shown in the pump performance tables against the
required capacity.
Never run this pump without
discharge flow for more than a few
minutes, as the water will heat and
cause damage to the pump or pipe
lines not covered by guarantee.
5. Foot Valve – Check Valve
All installations involving a suction lift should have a
good quality foot valve at the end of the suction pipe
to retain water in the suction pipe and pump body.
Installations having a positive suction pressure
(flooded suction) require a gate valve to be installed
in the suction piping. This is to allow for future
servicing needs.
IMPORTANT: For installations which
may allow water to run back through
the pump after switching off (e.g.
overhead tank filling), a check valve
(non-return valve) must be installed
at the pump outlet to prevent water
cascading back though pump.
6. Suction Piping
Suction lift is made up of the actual vertical height
from the water level below the pump to the pump inlet
port, plus the friction in the suction piping and fittings.
For best performance easiest priming, situate the
pump as close to the water source as possible.
Suction piping should be laid so there is a constant
rise from the water source to the pump. Any high
spots will cause air pockets to form and reduce the
efficiency of the system.
Do not allow the suction pipe to
lay in exposed sunlight if possible
as the water inside will heat up
during periods when the pump is
not operating. This will reduce the
suction capacity of the pump during
initial starting.
To reduce pipe friction and maximize flow we
recommend the use of pipe with equal or larger
diameter than the inlet on your pump. For detailed
recommendations regarding long suctions, please
contact your Davey Dealer.
NOTE: Suction leaks are THE
biggest cause of operating
difficulties and are hard to detect
because the problem is air leaking
INTO the pipe and there may be
no external sign of the leak. It is
essential that all suction connections
are completely sealed, using thread
sealing tape.
Do NOT screw connections too far into the pump’s
suction and delivery companion flanges. Do not
exceed tightening force of 60ft lb (8.2kgm). i.e. 60lb
force at the end of 1 foot wrench (25Kg at 30 cm).
