Question about A.O. Smith SQ1102 Pool Pump Motor
The motor is direct coupled to a model HMSF-1FL STA-RITE jet pump (120 ft deep well) for my sprinkler system , Motor is 1 1/2 hp 3450 rpm 230 VAC single phase, capacitor start Nameplate reads "thermally protected 3R147ABO" (might be 3RT47ABO).. I have the STA-RITE manual but it only details installation of piping and hookup to electrical supply. The motor quit operating two days ago.
I replaced the capacitor, motor still does not start.
There is no resistance reading across the two leads from the pressure switch to the motor, indicating an open circuit
is the thermal protector a one shot fuse or resettable device? If the latter, automatic or manual reset?
There are two bare copper strips in the rear which appear to be some sort of thermal device, there is a contact between them which is closed.Also some spring loaded parts below, I have no idea what their purpose is.
Would appreciate any diagram, information, also where to obtain replacement part, if necessary
Thanks in advance
The two copper strips in the back are the 'start winding contacts'. They must be closed when the motor is not running. As the motor starts, there is a centrifugal operated collar that will move forward toward the start winding contact and open the start winding in the motor (within 1-2 seconds). Make sure they are closed and 'zero ohms' resistance through them. The second part of the question about the thermal protection circuit: The thermal switch is 'automatic reset' and will re-close after opening from an over temperature in motor winding. If you read no resistance through wires going into motor, the thermal overload is probably failed open. Even if the start winding contact is open, you would still have a circuit through the 'run winding'. Check the connection on the thermal switch, (it's a round black plastic module with solder connections to wires coming out). Give it a good tap with a screwdriver, it may close for you, other wise it can be replaced (motor repair shop)
Posted on Sep 29, 2009
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Posted on Jan 02, 2017
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