BW SOLAR Waterboy, Руководство по установке

Страница: 5 / 27

5
Dam
– when installing in a dam the pump is placed into or beneath a flotation device to suspend it
in clear water. The pump is then tied to the opposite bank with a tie off rope to stop it floating
about.
Ensure the pump is tied off when in the deepest part of the dam so that it remains floating
throughout the seasonal fluctuations.
Probe: Secure the low water probe to a post (or star picket) in a vertical position, with the cable out
the top. Position the post in the dam before the determined low water mark where the pump needs
to stop pumping before entering mud and silt. Ensure the probe becomes dry before the pump.
Dam Kit – the Waterboy Dam Kit (when supplied) comes with a sturdy pump float assembly and 2
extra floats for keeping the cables and piping out of the mud and rocks at the bottom of the dam
Other
- This refers to a soak, lake, river or tank. We recommend to float the pump under a pontoon
or similar, but if this is not an option you should position the pump in an inclined position with a
minimum angle of 30°. To reduce the intake of sediment, do not place the intake of the pump very
close to the bottom of the river. Secure the pump in some slotted bore casing using stainless steel
wire rope.
For All applications it is recommended that a low water probe be used to avoid running the pump
dry. (p.4)
Installing the Pump under a Windmill or Hand Pump Cylinder
WATERBOY pumps can be combined with a classic water-pumping windmill or hand pump, to utilize
both energy sources automatically. The following system is often used with a conventional AC pump,
so a generator can be used for backup. The AC pump is placed immediately below the cylinder, and
connected to the cylinder’s threaded intake. When power is applied to the AC pump, it pushes water
up through the cylinder, pushing its valves open. When the windmill draws water, it sucks it up through
the AC pump with little resistance. (The centrifugal pump end of the standard AC pump allows water
to flow through it when it is stopped.) When both pumps operate, each one is relieved of its load,
more or less.
This system can be employed with WATERBOY pumps. A centrifugal model will allow water to flow
freely through it and does NOT require any special precautions. For helical rotor models, the following
warning applies.
To use a helical rotor pump under a cylinder, you must build a bypass assembly with a T fitting and a
foot valve (a check valve with intake screen). When the cylinder’s flow exceeds that of the solar
pump, water is sucked in through the foot valve. When the solar pump’s flow exceeds that of the
cylinder, the foot valve closes and allows the solar pump to work normally and push up through the
cylinder. To make this system for a casing 6 in (150 mm) or smaller, an offset using 45° elbows must
be carefully constructed.
Warning for Siphon Applications
If a pump system has a vertical lift of less than 10m up from the surface of the water source, and then
the water flows downhill to a lower point, a siphon effect may cause suction at the pump outlet. This
will cause an upward thrust on the motor shaft, resulting in damage to the motor. To prevent this,
install an air vent or a vacuum breaker at the highest point in the delivery pipeline.