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8 INSTALLATION IN DRILLED WELL CASINGS
INSIDE A 6 INCH WELL CASING, SPECIAL ELBOWS
ADAPTERS are required. The elbows fit 1/2"
polyethylene (black flex) pipe. MEASURE CAREFULLY
to determine the length of pipe you need. SUBTRACT
1.5% TO ALLOW FOR PIPE AND ROPE STRETCH.
Assemble according to diagram. A priming plug is not
needed. Before lowering the pump, place the intake
into a bucket of clean water and run the pump until
water exits. Now it is primed. A "pitless adapter" may be
optimum for freeze protection. Check with your local
well supplier for details.
9 ELECTRICAL WIRING
9.1 General
WIRE SIZING: DON'T CHEAT YOURSELF with under-
sized wire! Splice it to a larger size of wire if your wire
run is longer than 2 m / 7 ft. A wire sizing table for the
motor cable is shown on page 10 of this manual.
Consult a low voltage wire size chart to size the cable
size from tha array to the controller or call your dealer or
the factory for recommendations. Excessive voltage
drop will slow the pump down, but if it is unavoidable,
don't worry. It will NOT cause any harm to the motor.
The cable ends are labelled 1, 2, 3. Connect them in
this sequence with the pump controller to have the
correct direction of turning (clockwise). Check from the
fan of the motor. Looking on the fan of the motor the
direction is counter clock wise see also the arrow.
Changing the polarity of the DC ( plus & minus) input of
the controller will not change the direction of turning!
Only changing two of the three motor phases will do.
In case the motor turns in the wrong direction exchange
any of the three motor cables. Turning in the wrong
direction will not damage the pump if done for a short
time. Reverse the wires if necessary so that pump
turns CLOCKWISE looking from purtip end.
9.2 Grounding and Lightning Protection
A long wire run may act like an antenna, receiving
induced surges of high voltage when lightning is
present. Proper grounding will greatly reduce risk of
lightning damage to your power system.
A proper ground system consists of a minimum of one
2.5 m / 8 ft copper plated ground rod driven into the
ground, preferably in a moist spot close to the PV array.
Or, if you have a steel well casing, drill and tap a bolt
hold to make good contact to it.
In a dry, lightning prone location, use more than one
ground rod at least 3m / 10 ft. apart. Bury bare copper
wire between them. Use min, 4mm
(larger for distances exceeding 20 ft.). In a rocky
POLYETHYLENE PIPE comes in rolls, and is inexpen-
sive and quite freeze tolerant. Use with plastic adapters
and secure with ALL STAINLESS hose clamps (obtain
such clamps from a pipe supplier rather than automo-
tive supplier). lf pipe does not stretch tightly over fittings,
warm it with a torch or hot water then tighten clamps
firmly with a wrench. Keep extra clamps handy in case
you strip one.
If water flow becomes blocked, or if the pump jams or
freezes and cannot turn freely, the motor will draw
excessive current. A fuse or circuit breaker will then
break the circuit. The controller has an overload
protection but in case of a short circuit you will protect
the batteries.
Install a 20 Amp fuse or breaker. Install the fuse
between the battery and the pump controller.
FUSES: Use a "time delay" type installed into a rain
tight disconnect switch available at any electric sup-
plier. An automotive in-line fuse holder is fine for 12 or
24 V systems. Automotive blade fuses (type ATC) are
preferred over glass fuses. They have sufficient time
delay. (Time delay glass fuses are available from
ELECTRONIC suppliers only, not automotive.) Use
good quality fuse holders, protected from weather.
Keep spare fuses handy.
CIRCUIT BREAKERS: Most AC breakers cannot be
used for low voltage DC circuits. It may be ordered from
your PV dealer or from an electric supplier.
location, where ground rods can't be driven, bury (as
much as feasible) 45m / 150 feet (total) of bare copper
wire, radiating out in two or more directions from the PV
array. Try to contact moist earth as much as possible.
Use only the copper or bronze electrical connectors
designed for grounding application, and BE SURE ALL
CONNECTIONS ARE TIGHT.
Connect your ground system to the METALLIC FRAME
of your PV array via min. 4mm
ground metallic support structures and electrical
enclosures.
2
/ #8 ground wire
2
/ #8 copper wire. Also
9
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