6
4. INSTALLATION
4.1 Choosing a site
Choose a clean and dry site with a firm base as close to the water source as possible with correct power
supply. Make sure your pump is always connected to an adequate, reliable source of clean water. To protect
your pump from the weather, make sure the pump house is both waterproof, frost free and has adequate
ventilation. The pump should be mounted on a firm base allowing for drainage, to avoid damage to flooring etc.,
that over time may occur from leaking pipe joints or pump seals. Do not mount the pump vertically. Never place
flammable materials on, or near your pump.
The pressure that DynaDrive comes pre-set to is as follows:
* DD15-35NPT 414kPa (60psi);
* DD60-10NPT 414kPa (60psi);
* DD90-11NPT 414kPa (60psi).
However, it is possible to adjust the pressure set point. Some plumbing authorities impose a pressure limitation
on the pressure of water into a dwelling. Consideration of operating pressures should also be given to
appliances within the dwelling. If unsure, check with local authorities, or a licenced contractor.
4.2 Pipe connections
IMPORTANT: Suction leaks are the largest cause of poor pump performance and are
difficult to detect. Ensure all connections are completely sealed using thread tape only.
DO NOT USE SEALING COMPOUNDS, HEMP, OR PIPE DOPE.
For best performance use P.V.C, or polythene pipe with a diameter at least the same as the pump’s inlet. Larger
diameter pipe may be used to minimise resistance to flow when pumping for distances longer than 5m (16’). Use
unions at pipe connections to enable easy removal and servicing.
Use enough “plumbers’ tape” to ensure airtight seal and
hand tighten only, do not screw connections all the way
into suction port, see figure 4.1. To prevent strain on pump
thread always support heavy inlet and outlet pipes.
Lay suction pipe at a constant gradient to avoid air pockets
which may reduce pump efficiency, see figure 4.2.
Avoid installing 90° elbows before the suction inlet of the
pump, within a distance equivalent to 5 x pipe diameter.
For example: using 40mm (1½”) suction pipe, avoid
installing a 90° elbow within 200mm (7¾”) of the pump
inlet. This will assist laminar flow.
4.3 Air Handling
While Davey must stress the overall requirement for all suction lines to be
airtight, we also are aware that sometimes removing air from suction lines or
stopping minor leaks can be difficult.
To help you get the most from this new capability please read this addendum
in conjunction with the full Installation and Operating Manual included with
your pump.
Plumbing: Pay special attention to ensuring the suction pipe and associated
fittings are airtight. The absence of a water leak on the suction line may not
confirm that the pipe or fittings are airtight.
Should the suction line contain air pockets it can aid the priming process greatly if you can temporarily isolate
the discharge line from the pump and instead use an adjacent tap to allow the pump to discharge water until full
prime is established. Such a facility is also useful for future servicing and troubleshooting should it be required.
Figure 4.2
Figure 4.1
Summary of Contents for DynaDrive DD15-35NPT
Page 31: ...31...
