7
Draining the DuroJet Convertible Deep Well Jet Pumps
Drain openings are provided on all models. To drain the pump:
1. Remove the drain fitting and the prime plug to vent the system.
2. Drain all piping to a point below the freeze line.
Draining the Tank
Conventional tanks can be drained by opening an outlet at the lowest point in the system. Remove a plug or the air volume
control to vent the tank.
Precharged tanks force virtually all the water from the tank when the system pressure is released. No draining is necessary.
Restarting Pump
If the pump has been serviced, drained, or has not been used for some time, be sure there is water in the pump housing
(volute) and the piping to the well. There must be water in the pump housing (volute) at all times when the pump is running to
avoid internal damage of seal members (see page seven for priming information).
Precharged Tank
Some air is lost through the bladder in any tank. To prevent tank failure, check the tank precharge on a yearly basis.
1. Open a faucet nearest the tank and allow all water to drain from the tank.
2. Measure the tank precharge at the valve stem using a tire gauge.
3. If necessary, adjust the precharge with an air pump to 2 PSI below the cut-in pressure of the pump.
Lubrication
The bearings used in the pumps are lifetime lubricated at the factory and require no additional lubrication.
Diagnosing Waterlogged Tanks – Conventional
When a tank system has an inadequate ratio of air and water, the pump will start and stop often and erratically.
1. Disconnect the power to the pump.
2. Open the lowest faucet in the system to release all pressurized water in the system.
3. Prime the pump.
4. Reconnect the power to the pump.
NoTe:
As the pump refills the tank with water, the air volume control supplies the tank with the correct air to water ratio
for the system to operate. If the air volume control is good, the pump will shut off at the desired cut-off and will be
adjusted correctly.
Diagnosing Waterlogged Tanks – Precharged
If a precharged tank becomes waterlogged, the bladder is normally leaking or broken.
1. Test the tank by depressing the air valve. The air valve will expel water if the bladder is broken.
2. Replace the tank.
