Question about Smith A. O. Single Speed J-Frame Threaded Shaft Full-Rated Motors for Hayward Northstar Pumps - 1 HP

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Waterl pump protect circuit

My idea is to design circuit to automatic shut down pump when pump loses vacuum.. So far I have contactor either with 24 coil or 110v coil in series with vacuum switch.My problem is circuit will not close upon time clock starting pump because vacuum switch has no vacuum.If I could temporary short vacuum switch with time delay it would than be able to shut pump down if it lost vacuum for some reason. Any ideas

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A momentary contact switch can be used to bypass the vacuum switch until operating pressures and vacuums are reached. It is called a start switch.

Posted on May 04, 2009

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You need to install a time delay relay.

Posted on Nov 08, 2008

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1 Answer

Reset the contactor relay


the contactor does not have a reset button 24 volts will energize a magnet and pull the contactor in you can also manually push in the contactor for testing purposes the airhandler has the transformer which produces 24 volts this power then goes to the tstat then you select a mode which then goes to the contactor you most likely have a blown fuse on the circuit board or simular problem the contactor could have shorted causing this

Jun 27, 2012 | Goodman Heating & Cooling

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How it works: Central AC Contactor


Magnetic relays commonly known as definite purpose contactors are used in a variety of different applications throughout the HVAC and Appliance world. They can have anywhere from 1 pole or up to 4 poles or more. The coils on them can be 24 volt 120 volt 240 volt or even 440volt and better.02c6373.jpg Their main job is to power compressors and fan motors on various equipment. On a home unit the contactor is almost always a 24 volt, 2 pole, 30 amp one. Some smaller units have what is known as a pole and a half. or 1.5 poles. The coil pulls down only one side of the contactor, while the common leg has a straight bar across it. On home units smaller thermostat wires connect to the 24 volt coil powered by a transformer.When the temp rises the thermostat calls for the contactor to yank down and power up the compressor and fan outside. If those small wires are chewed up by an animal or a weed eater then power to the coil cannot do its job. Very often the 24 volt coil on the base of the contactor just dies. A couple videos I found on line will give an idea of various types used in home units. A guy had a unit which would not shut down because of fried welded together contacts. He did an autopsy of the old part. I thought it was cool.

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on Aug 21, 2010 | Heating & Cooling

1 Answer

Heat pump wont start


When you are testing the contactor on a coil, you should remove the tstat wires then hook up your voltage meter to the wires then turn on your tstat check the meter to be sure u are getting 24 volts.

If you are getting 24 volts, put wires back in place on contactor then measure voltage across the contactor to see if you are getting 24 volts. If there isnt 24 volts then the contactor coil is bad and needs to be replaced.

Mar 26, 2012 | Heating & Cooling

1 Answer

I have a Fredrich 8000btu wall unit model number CPO8F10 and the compressor will not shut off, even when the unit is turned off the compressor keeps running. the only way to shut it off is to unplug...


If your air conditioner or heat pump compressor won't shut off unless you pull the fuses or turn off the circuit breaker. You probably have a stuck contactor. The contactor is the name we give to the big relay that controls your air conditioner, heat pump or other large electrical device. If the indoor blower fan will not shut off either then the problem is NOT the contactor in the outdoor unit but a problem with the thermostat or the wiring to it either at the subbase or the furnace. Before replacing your thermostat you should isolate the cause of the problem or it will persist and drive you nuts. Look for wires touching or cut too long. A contactor or relay is an electrical device that takes a control signal usually 12 volts DC, 24, 120, 208-230 volts ac and creates a magnetic field to pull in a set of contacts that controls another device that may or may not get its electrical power from the same circuit. Note: 99% of most control circuits are 24 volts AC. The contactor has steel contacts that are plated with silver. When the silver wears away you have just plain steel and the steel will weld itself together. Sometimes if you whack the contactor with a screw driver you may free it for a while but the problem will re occur. This problem is especially a problem when a piece of equipment has not been run for a period of time. It is normal for the contactor to wear out over time like brake pads on a car. If the contactor shows any signs of wear it should be replaced as a preventative measure or as part of maintenance. If you suspect a stuck contactor a 100% accurate test is to turn off the power to the indoor section which removes control voltage to the outdoor section and it (outdoor section) keeps running. Do not keep messing with it, your contactor it is bad and you will destroy your compressor if you let it run!!! You can also have problems with spiders building nests in the contactor; the silk is an insulator and will prevent electricity from flowing. Replacing a contactor is a simple matter and they are readily available. Costs vary from about $40 installed to several hundred dollars depending on the size and current carrying capacity. If your compressor does not shut off when it needs to and the indoor fan does you will destroy your compressor. The high and low pressure cut-outs won't work either.

Aug 20, 2011 | Friedrich Heating & Cooling

1 Answer

On my goodman ssz160481ab heat pump. When going into either heat or cool mode the contactor won't hold. its as if the coil voltage is going on and of very fast causing the contacts to burn out. I replaced...


Disconnect the yellow Y1 wire from the thermostat to the control board in the air handling unit and read the voltage from C - common to the yellow wire. It should be 24 VAC, 0 VDC. If it is, cconnect the wire back to the control board. Now, disconnect the yellow Y1 wire at the outdoor condenser. You should have 24 VAC, 0 VDC. If you have the lower ac voltage and the dc voltage, you may need to replace the control board. Please shut down power before removing or connecting wires and remember to wait for the 3 minute delay before checking the voltage

Dec 12, 2010 | Heating & Cooling

1 Answer

My cooling and heat pump quit working and the fan outside does not come on. If you push in the contactor in the fan comes on and sounds like the compasator does to.


Check the voltage at the contactor where the 24 vac connects to the coil for the contactor so you can see if it is making it that far. It will be 2 smaller wires that are not connected to the 240 vac. Let me know if you have 24 vac there. The thermostat will have to be calling for air for the 24 vac to be present. let me know what you find.

May 05, 2010 | Intertherm P3RA-060K Air Conditioner

1 Answer

Ebara dominator 1hp automatic pump 110v blows circuit


Try to relocate the position of the pump where it would be protected from water splashes. The pump motor casing might not be designed for outdoor use or not desirable for water splashes. You may also replace your pump with units designed for this purpose (pump with motor casing rating of IP 65 or IP 55).

Jun 06, 2009 | Plumbing

2 Answers

I need assistance with swapping out a contactor.


I don’t believe changing the contactor to a double pole contactor will solve this problem. It appears by your description that bugs are being attracted to the contact points on the contactor. Changing to a double pole contactor will not eliminate that problem but only provide another contact point for the bugs to be attracted to. The most effective solution would be to replace the current contactor with a sealed design where the contact points are totally enclosed. Enclosed contactors are completely enclosed protecting it from bugs and dirt. These type of contactors are available in the single pole design so no further wiring modifications are needed. You can consult a professional A/C service company like mine for more information and assistance.

Hope this helps. Let me know if there's anything I can do for you!

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Apr 30, 2009 | Ruud Central System Air Conditioner

1 Answer

A/C unit air handler comes on inside but outside compressor does not come on. The contacts are not working. If I hold down the contacts the compressor comes on and unit works.


Check and find out if you have 24 volts across the terminals for the coil of the contactor. If you have 24 volts across the terminals and the contactor does not pull in change the contactor with one of the same ratting. If you do not have 24 volts across the terminals for the contactor coil your problem in in the 24 volt circuit. Possible that the thermostat is not sending power to the contactor through the "Y" terminal.

Jul 20, 2008 | Ruud Heating & Cooling

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