Davey 165S SHALLOW WELL PRESSURE PUMPS & SYSTEMS - Manual (Page 7)

Maintenance
applicable for Models operated as pressure systems only
The only regular maintenance necessary is to check the air charge in the pressure tank. It is recommended that this be carried
out every 4 - 6 months as follows:
1. To check air charge pressure, switch off the electric power to the pump. If the water level in your supply reservoir is
higher than the pump, also close the gate valve to prevent water entering the pump.
2. Drain water from the pump by opening a convenient tap.
3. When all the water (and hence pressure) has been released from the pump, pressure tank and piping, check air charge
pressure at air valve on top of tank using a tyre gauge. The pressure should be 15kPa (2 psi) below cut-in pressure
switch setting.
4. Replenish air if necessary, and replace air valve cap securely.
trouble shooting
1. Pump Not Delivering Water or Not Building Up Pressure:
May be caused by one or more of the following:–
(a) Pump not properly primed;
(b) Footvalve or checkvalve not installed or leaking;
(c) Footvalve not installed below water level;
(d) Suction lift too high;
(e) Suction piping not correctly sealed or holed allowing air to enter pump suction:
(f) Checkvalve installed in wrong direction;
(9) Blocked jet or venturi in pump;
(h) Insufficient water supply source.
2. pump not starting:
May be caused by one or more of the following:–
(a) Power failure;
(b) Blown power fuse;
(c) Motor overload tripped;
(d) Motor windings faulty;
(e) Pressure system not switching ON due to static delivery head causing higher pressure on the pump than the pressure
switch cut-in setting;
(f) Low voltage power supply causing overload to operate;
(9) Motor or pump seized.
3. Pump (When Installed as Automatic Pressure System) Switching On and Off Frequently Or When No Taps
turned on:
May be caused by one or more of the following:–
(a) Footvalve or checkvalve not retaining pressure or water;
(b) Water leaking from suction or delivery piping;
(c) Leaking ball valve in toilet cistern, hot water system or stock troughs;
(d) Pressure tank not retaining air pressure or air charge too high;
(e) Motor thermal overload tripping.
4. Pump (When installed as Automatic Pressure System) Not Switching Off Or Taking too Long to Switch Off:
May be caused by one or more of the following:–
(a) Voltage supply too low;
(b) Blocked jet or venturi in pump;
(c) Leak in discharge pipe or fittings, taps etc.;
(d) Worn or blocked pump components - impeller, pump body etc.;
(e) Drop in water supply level.
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