5
3.5 Installs with a mains pressure hot water system
ATTENTION: Always ensure hot water systems are installed in compliance with
manufacturers recommendations and in accordance with all local regulations.
To protect your system from damage caused by back pressure from hot
water systems, see figure 3.5. You should always have installed on the hot
water inlet an approved non-return valve.
Davey Water Products Pty Ltd cannot accept responsibility for loss or
damage resulting from incorrect, or unauthorised installations.
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:
* DD60-10(CE) 400kPa (58psi);
* DD90-11(CE) 400kPa (58psi);
* DD60-10NPT 414kPa (60psi); or
* 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
difcult 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.
Figure 3.5
Figure 4.1
Figure 4.2
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