Davey 165D DEEP WELL PRESSURE PUMPS & SYSTEMS - Manual (Page 5)

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Having established the length of the piping required for attachment to the injector,
connect the injector assembly making sure that the larger pipe is fitted to the long
venturi tube of the injector.
Use 2 hose clips on each pipe connection with worm drives facing but on opposite
sides of pipe, and tighten securely. It may be necessary to heat the polythene
piping slightly before pushing it on to the hose tails. At the other end of the suction
pipes (top of bore end), remove the suction cover from the pump and fit it to the
piping using the elbow connectors provided with the injector housing kit.
Lower injector assembly into bore hole and attach suction cover to pump with
rubber gasket in place. Tighten the nuts sufficiently to prevent air leaks around the
gasket, but do not overtighten. Attach Deep Well Injector model label (supplied
with injector kit) to pump suction cover adjacent to inlet thread.
Delivery Piping
Polythene piping, imperial or metric, is recommended. Select the grade of pipe
which has a pressure rating suitable for your application. Galvanised or PVC
piping may also be used, provided the pressure rating is adequate.
For more detailed advice and information regarding pipe sizes for longer suction
situations or greater suction lifts, please contact your Davey Dealer or the Davey
Customer Service Centre.
Outlet Plumbing Connections
Pumps to be Operated as Automatic Pressure Systems
BASE MOUNTED TANKS USED.
1. Remove cap from ADR regulator valve and connect hose from it to Davey
Supercell Pressure Tank. If using Davey Tank Hose firm hand tight should be
sufficient. Ensure tank connection hose is not kinked.
2. Fit gate valve on the 11¦4” outlet connection of the pressure regulating valve
using thread seal tape.
3. Connect delivery piping at gate valve.
4. Fit pressure gauge/priming plug on top of Pump.
Ensure joints are air tight, thread seal tape or pipe joining compound is essential.
Securely tighten 2 hose clips on each connector. It is essential that there be no air
leaks at this connection, particularly because air leaks are the biggest cause of suction
priming difficulties. Air being sucked in is almost impossible to detect. Ensure that
both pipes are an even length, and will lie straight side by side before installing in the
bore hole.
A gate valve must be fitted to the 1 1 / 4 ” pump outlet at the pressure regulating
valve before the connection of outlet piping.
Power connections and wiring must be carried out by an Authorised Electrician.
Pressure Switch Setting
All Deep Well Models have a factory-set pressure switch cut-in of 210 kPa, and
350 kPa, cut-out. The switch settings may require adjustment to provide the best
constant performance, reducing pump cycling to a minimum. This work may
require the assistance of an experienced pump installer.
Pressure Tank Pre-Charge
The Davey Supercell Pressure Tank requires the correct pre-charge of air for
satisfactory operation. This pre-charge of air is determined by the cut-in pressure
switch setting required for the particular system purchased. This pressure must
be adjusted prior to operation of the system to 195kPa (28 psi) which is the correct
pre-charge for Deep Well pressure switch setting of 210 — 350 kPa. If higher
operating pressures are required, the tank pressure must be set to 15kPa (2psi)
below the cut-in switch. Adjust this pre-charge before operating the pressure
system. This pre-charge pressure may be checked using a standard automotive
type tyre pressure gauge.
Operating the Pump
1. Close gate valve (in outlet piping).
2. Remove priming plug and fill pump body and suction pipes with water by
pouring water into the priming port on top of the pump until suction pipes
and pump are completely full. Allow air bubbles to come to top of casing.
Continue topping-up as air bubbles come out. For long ‘offset’ installations, it
is recommended that an engine powered pump be used to fill suction pipes.
Riser pipes installed at high points in both suction pipes may be necessary to
‘bleed’ out air fully. Ensure all fitting and caps are air tight.
3. Replace priming plug and switch on pump.
4. Crack gate valve at pump outlet to expel trapped air. When pump primes,
pressure gauge reading will climb to over 350kPa. It may be necessary to
switch off and top up pump and pipes with water several times to expel all air in
the system and gain prime.
5. Once prime is established, open gate valve slowly. A strong flow of water
should be evident at an outlet tap indicating pump is functioning.
Automatic Demand Response
(ADR) - setting up instructions
Deep Well Installations require a certain
minimum pump pressure to operate
satisfactorily (See Table).