Davey 165S SHALLOW WELL PRESSURE PUMPS & SYSTEMS - Manual (Page 4)

Three phase 165S Pressure Pump models have been designed to allow for
connection either side of the Capacitor Cover (marked “A” in figure one) on the
motor. (NOTE: Three phase motors do not have capacitors fitted in the Capacitor
Cover).
This is achieved by way of either of the two 19mm access holes (marked “B” in figure
one). The access holes are designed to accept most standard cable grommets. The
unused hole can be sealed by inserting the plug enclosed with the pump. To connect
a three phase Pressure Pump start by removing the Terminal Cover (“C”).
A short four core flex (“D”) is fitted from the
motor terminals (“E”). This lead is inserted through the blanking grommet (“F”).
Pressure switch or other control leads (“G”) can be fitted as well. Incoming power
(“H”) can be fitted through the preferred access hole, and terminated as shown in
Figure Three. A termination kit is available if required.
Insert the blanking grommet (“F”) into the capacitor cover (“A”). Fix the short lead (“D”)
into the path provided in the non-drive endshield and replace the terminal cover (“C”).
IMportant note: tHree pHase Models onlY
When the unit is connected and operating the phase balance should be checked. This should be within 5% variation. “Rolling”
the leads may help to improve a small unbalance, but major phase unbalance will usually be attributed to an input power
unbalance. This must be addressed before the pump is used.
InstallatIon
Allow possible removal of the pump at some future date when attaching piping. (e.g. flexible hose and clips, pipe
union etc.).
the use of thread seal tape on all pump connections is recommended as some sealing compounds may affect plastic.
suction connections
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, as well as creating priming difficulties.
For installations which involve unavoidable high spots in the suction pipe, a “riser” for priming may overcome the problem.
(A) Installations to Water Sources Below Pump
A foot valve must be used on the end of the suction pipe for all below ground installations. For optimum pump operation and
priming, ensure that the suction pipe is level, or rises evenly from the water source to the pump.
(B) Installations to Water Sources Above Pump (e.g. Water Supply Tank)
To allow sediment to settle and not enter the pipe to the pump, the outlet from the supply tank should be 50mm (2”) above the
bottom. The outlet from the supply tank should be at least 38mm (1 1 /
2
”) diameter, and fitted with a gate valve.
For Pressure System Installations, a check valve must be fitted to the supply tank outlet, alternatively, this check valve may be
installed at the pump rather than at the tank outlet.
Note: Air leaks in suction piping are THE BIGGEST cause of operating difficulties, and are hard to detect
because the problem is air leaking INTO the pipe. There may be no external sign of the leak.
Note: Minimum three phase voltage supply at the motor must not fall below 374 volts, otherwise motor
damage may result which is not claimable under guarantee.
power connections and wiring must be carried out by an authorised electrician.
Before finalising wiring connections, check that motor rotates in direction of arrow (clockwise when shaft is
viewed from wiring connection end). To alter rotation, change any two power leads at motor terminals.
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