Davey 4 Submersible Borehole Pumps SERIES J User Manual

Submersible

Borehole Pump

100mm (4”)

SERIES J

INSTALLATION AND

OPERATING INSTRUCTIONS

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.

Please pass these instructions on to the operator of this equipment.

Installation & Operating Instructions

It is important that all submersible borehole pumps be installed by experienced persons and that all electrical connections
comply with the relevant electrical supply authority requirements.

The electrical connections and checks must be made by a qualied electrician and comply with appli­cable local standards.

These instructions are provided for guidance only, and assume a familiarity with submersible pump installation and
commissioning procedures.

Should additional information or clarication of certain points be required in Australia, contact our Customer Service
Centre on 1300 2 DAVEY (1300 232 839). For New Zealand contact the Davey Products Pty Ltd ofce on [phone].

Bore Conditions

1. To guard against installing a pump in aggressive or abrasive water, it is suggested that an analysis of the bore
water be submitted to an authorised testing authority prior to installation of the pump. Damage to the pump or

motor caused by abrasive or aggressive water is not covered by the guarantee. The water analysis parameters
listed below are intended as a guide only as various combinations of the below items and others may act as a

corrosive uid: PH - 6 to 8

Total dissolved solids (PPM) - 1,000 maximum
Chlorides (PPM) - 500 maximum
Fe (PPM) - 2 maximum
C0

O

Sand content - 25 gr/m

2

(PPM) - 50 maximum

2

(PPM) - 2 minimum

3

maximum

WATER QUALITY: The above guide is NOT an indication of safe drinking water. A water analysis for
this purpose should be undertaken.

2. Know the approximate replenishment rate of the bore before selecting a pump. Select a pump with a maximum of
10% less discharge than the replenishment rate of the bore.

3. Where bores are sunk into aquifers comprising of sand or ne gravel, it is important that they be adequately

screened to prevent the ingress of these materials into the water being pumped. It is also important that the bore
be cleaned prior to the installation of the pump, and that the pumps must not be used for “bailing” or developing the
bore.

4. In the event that the water is entering the bore from a level above the pump (“a cascading bore”), or where the

pump is installed in a large diameter bore, or in a river or other open water sources, a shroud may be required

over the pump to ensure that all water being pumped is drawn over the full length of the motor’s surface. Minimum
water velocity past a motor for adequate cooling should be 0.08m/sec @ 20oC water temperature.

5. To assist in protecting the integrity and quality of your bore water supply we suggest a bore cap be tted to the top

of your bore casing at all times. This may also assist pump installation.

Coupling the pump with the motor

NOTE: Before coupling pump to motor ensure pump and motor models are as specied.

For ease of transportation and to minimise potential transport damage, Davey 4” submersible borehole pumps are
supplied in component form, ie. motor and liquid end boxed seperately. For correct coupling, proceed as follows:

- Remove cable guard after removing the lock screws.

- Remove the check valve or unscrew the poppet retainer and remove the check valve poppet dependant upon

model and insert a screwdriver into the shaft end to ensure the pump is free to rotate. Some small resistance is
normal.

- Position the pump and motor so that they are aligned along the same axis.

- Insert the motor shaft into the pump coupling, using the screwdriver to rotate the shaft to align the coupling to the

motor shaft.

- On each motor stud t the four nuts which secure the pump to the motor, tightening them a little at a time in a
diagonal sequence. Where the nut is to have the stainless strainer tted, ensure that these nuts and the motor jam
nut have the ats aligned parallel to the motor adaptor circumference.

- Align the motor cable along the pump, then secure the cable guard with the setscrews into the side of the pump.

2

- Where supplied, t the stainless steel suction strainer.

- Replace the check valve or check valve poppet and retainer.

CAUTION: BE SURE THE MOTOR KW SIZE IS EQUAL TO (OR EXCEEDS) THE MOTOR KW REQUIRED FOR
THE PUMP.

Ensure the motor voltage & phase matches the supply voltages & phase.

Installation

NOTE: FOR SEALING OF PIPE THREADS ONTO YOUR DAVEY SUBMERSIBLE BOREHOLE PUMP USE
THREAD TAPE ONLY. DO NOT USE PIPE SEALING COMPOUND AT ALL.

1. Drop Pipe

Polythene drop pipe may be used, providing the pressures and do not result in operating pressure which exceed

the pipe rating.

All pipe and ttings must be suited to the maximum pressures available from the pump.

The starting torque of the pump motor tends to give a twist which could cause the pump shell to rub against the inside walls

of the bore casing - especially if rigid PVC or polythene pipe is used. Torque stops may be installed to dampen this twisting.

2. Safety Cable

As a precautionary measure, a safety line should be connected to all pumps regardless of the type of drop pipe

used. This line should be fastened to the pump and at the top of the bore casing.

3. Depth of Installation

For the maximum allowable submergence consult the motor specications from the motor supplier. Ensure that the

pump is installed at least one (1) metre, preferably 3 metres above the bottom of the bore, and one (1) metre below
the maximum draw down level.

WARNING: If during the initial operation the pump lowers the bore water level down to below the suction inlet it will

be necessary to lower the pump, where feasible or install a level probe protection device to prevent the pump from
running under aerated water conditions.

NOTE: OVER PUMPING OF THE BORE (AERATED WATER) WILL CAUSE DAMAGE TO PUMP AND OR
MOTOR NOT COVERED BY GUARANTEE

Before lowering the pump unit, smooth out any rough spots or sharp edges on the top lip of the bore
casing to prevent damage to the pump or power cables when lowering the unit into the bore.

4. Check Valve

All Davey submersible borehole pumps are supplied with a check valve, and no additional check valves are

required for open discharge conditions up to a maximum of 80 metres head. For installations greater than 80
metres head, or when used as a pressure system, it is recommended that an additional check valve be tted
approximately no more than 60 metres vertically above the pump and every 60 metres vertically thereafter. The
tting of this check valve will limit potential water hammer and consequent pump damage.

3

5. Pressure System Installation and Pump Controls

Davey submersible borehole pumps may be used as a pressure system in conjunction with pressure tanks

providing a suitable draw off capacity. When selecting a pressure tank, make sure that the rated tank pressure is at
least 10% greater than the pump pressure at the bore head. Also make sure that the tank draw off capacity is large

enough to limit the pump’s starts to an absolute maximum of those relevant to the motor used.

While small capacity tanks may be used, extreme care must be taken to ensure the pump unit does not ‘cycle’. It may

be necessary to t more than one pressure tank to provide the required draw off or to help prevent pump cycling.

The installation of a ‘drilled check valve’ to the pressure tank may assist in the prevention of pump ‘cycling’

problems. For further information on these contact your Davey Dealer.

NOTE: Any automatic switching of the pump giving excessive starts per hour will shorten the life of the pump
and damage caused may effect warranty cover.

PRESSURE SWITCH WIRING: Starting current (inrush current) from large motors may damage pressure
switch. Pressure switches installed with motors of 1-1/2hp (1.1kW) or larger should be wired through a
magnetic contactor to aviod burning out pressure switch. Consult your Davey Dealer for further information.

Typical Submersible Installation

A. PUMP CONNECTED FOR MANUAL OPERATION.
B. PUMP INSTALLED AS AN AUTOMATIC PRESSURE SYSTEM INCORPORATING PRESSURE TANK AND
PRESSURE SWITCH.

WARNING: Failure to use correct starting equipment and overloads may damage your submersible mo­tor. This damage may not be covered by warranty.

4