Question about AO Smith 1 1/2 HP 115/230V 56C Replacement Motor

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I have a 1hp 115/230 phase 1 sprinkler pump what size pressure switch do i need 20/40 or30/50 ?

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The pressure switch needs to be sized for the pressure and the motor current. The pressure would depend on your piping system, and hao many sprinklers you have on a section. You can buy a pressure switch that is adjustable, and you can set the pressure you need. You also must be sure the current rating (amps) of the pressure switch can handle the motor current (amps) there are is a wide range of switches available. You can't go wrong with a square d though. Available Home Depot, graingers, electrical supply etc.

Posted on Jul 04, 2010

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1 Answer

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1 Answer

I have 1 and 1/2 horsepower sprinkler pump that wont prime. As soon as the end piece fills, it will empty if I open the end to the sprinkler.


I don't know what is your system set up. However, the system set up should be the following;
1. Your 1-1/2HP sprinkler pump must be installed at
a fix location nearest the water source. (Complete
with power and plumbing lines.)
2. At the end of the suction line is a vertical check
valve with strainer.
3. The suction pipeline must be connected to the
suction port of the pump.
4. At the discharge port, a flow control valve tee must
be installed. The flow control valve tee top is
covered with a plug, which serves as the priming
port when opened.
5. After the flow control valve, connect a short nipple
so that you can put a gate valve to stop the water
flow or allow the water to flow. You may connect
a pressure tank at this point or you may connect
the pressure hose going to the sprinkler.
6. To prime the pump, open the plug at the flow
control top. Fill it full with water, replace the
priming port plug.
7. Turn the flow control valve to full closed position.
8. From full close position, switch the power on.
9. The pump now run on and off due the pressure
switch setting. Slowly open the flow control valve
such that the water pressure remains steady.
10. Take note of the pressure.
11. Shut the power off, and connect the sprinkler
pump hose.
12. Put the power back on, and allow the pump to
run with the sprinkler.

Under this set up, you can run the sprinklers when your pump is running. Hope this will solve problem.

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2 Answers

2009-10-05 I have a motor in my garage that serves my water softener, sprinkle system, and outdoor faucets in conjunction with a well pump. I live in Virgina Beach, VA. The motor is an A.O. Smith machine...


sounds like just pressurizing ur holding tank pumps come on and off depending on how sensitive ur pressure control is normal operation of unit

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