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Why they used one pole shunt contactor in ac condending unit?
Wiki User
â 15y ago
I would prefer to see how it is wired before guessing but here goes: On a single phase home ac condenser you need to make/ break only one leg of power to cycle the compressor and fan on and off and that is a less expensive alternative for the manufacturer than a 2 pole contactor would be ( so much for the single pole part of the question). As far as the shunt here is where I am guessing: Air Conditioning and refrigeration compressors have heaters in their oil sumps to prevent refrigerant from migrating to the oil and diluting it which would lower the oil`s lubricating properties. In the old days these heaters were powered 24/7/365. But now these heaters are turned on only in the compressor`s off cycle ( via the shunt) because when the compressor is operating the oil is warm enough to prevent refrigerant migration and by cycling the heater to be on only when it`s needed they are gaining electrical efficiency and thus improved SEER.
Wiki User
â 15y ago
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In a typical 2 ton air conditioning unit what voltage engages the point of the contactor?
24 volts should engage the contactor and most likely let the 220 volts flow through.
How do you hook up wire from ansul system to shunt trip breaker?
You would need to take the "input" wire for the shunt trip breaker to an electrical switch (not alarm initiating switch, which are DC voltage rated) within the Automan unit and connect to the "Common" connection and the "return", the wire to the actual shunt circuit of the breaker, from the "Normally Open" connection of the switch. When the unit activates, the switch will be placed into "Closed" position, therefore completing the circuit and activating the shunt coil.
What could be wrong with your home AC central air if the thermostat clicks on and fan but AC unit won't start and new fuses and switching the breaker on and off didn't help?
It could be off on a low pressure switch. You need to check if you have 24 volts to the outdoor unit at the contactor coil. If the contactor is not working the outdoor unit will get no high voltage to the compressor or fan. It could also be that the capacitor for the fan and compressor is blown.
What device is the only load in the control circuit of a condensing unit?
I think that would have to be some relay or contactor coil for a fan, compressor or relay contacts.
What will happen when field winding of dc shunt motor is disconnected?
Typical applications; "the motor will have a limited amount of torque, lesser in value than what is needed for normal operation. Thus, is real world workings the unit will overload, stop, not work, trip OL.
How do you know what contactor will work on your unit if you have a Trane model TWR042c100b2?
Most are fairly universal. Determine if you have a single pole or double pole contactor and see if the parts house will sell you one. If you know how to read a schematic, it is a piece of cake; if you don't, just remember kill the power to both indoor and outdoor units and to map the wiring before you remove the wires and you should have no problem.
Why does the air conditioning compressor keep operating long after the system is turned off?
The contactor on the outdoor unit is probably stuck. Disconnect the power to the indoor unit, then disconnect the power to the outdoor unit and take a look at the contactor.
What is a contactor for a Central Air Unit?
The relay actuated by the thermostat which starts and stops the compressor and condenser fan in the outdoor unit.
What is the unit of flux per pole?
The unit of flux per pole is Weber (Wb).
In a typical 2 ton air conditioning unit what voltage engages the point of the contactor?
24 volts should engage the contactor and most likely let the 220 volts flow through.
What is a condensing unit contactor?
all it is is a switch that you will usually find 4 wires coming out of. how it works is you get a call for cooling from ur air conditioning unit and that sends a 24v signal to the contactor and it closes the curcuit and gives power to you condencer. control device to relay power to a load
What would cause the outside unit not to kick on when the blower unit starts?
disconnect beside unit may have blown fuse or tripped breaker,contactor in outside unit may be bad,or no coolant in system
What is The unit of pole strength in SI system?
The unit of pole strength in the SI system is ampere-meter (AâĒm).
How do you hook up wire from ansul system to shunt trip breaker?
You would need to take the "input" wire for the shunt trip breaker to an electrical switch (not alarm initiating switch, which are DC voltage rated) within the Automan unit and connect to the "Common" connection and the "return", the wire to the actual shunt circuit of the breaker, from the "Normally Open" connection of the switch. When the unit activates, the switch will be placed into "Closed" position, therefore completing the circuit and activating the shunt coil.
What is wrong when you have to hold the contacts down in order to get the outside rheem heat pump to come on and stay running?
low voltage from thermostat is not properly connected to contactor. transformer is bad. contactor is bad. >>>>>>>>>>>> You have an open pressure safety switch on the outdoor unit or the control wiring from indoors to outdoors is too small a gauge which will lower your control voltage at the contactor.
What is a contactor coil?
a contactor is generally looks like a small box connected to an electric circuit. it is what controls electricity flow to a motor. in the middle is normally a way to push in the contactor to manually check to see if either the motor works or if you have electricity.
What could be wrong with your home AC central air if the thermostat clicks on and fan but AC unit won't start and new fuses and switching the breaker on and off didn't help?
It could be off on a low pressure switch. You need to check if you have 24 volts to the outdoor unit at the contactor coil. If the contactor is not working the outdoor unit will get no high voltage to the compressor or fan. It could also be that the capacitor for the fan and compressor is blown.
