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Any three phase motor can be reversed in rotation by inter changing any two of the motor's incoming feed conductors. For example connect the motor winding wires to L1, L2, L3 and the rotor turns clockwise in rotation. Connect the same motor to L3, L2, L1 or L2, L1, L3 or L1, L3, L2 and the rotor turns counter clockwise. As you can see any combination of the two wires will reverse the rotors rotation.
Wiki User
∙ 8y ago
Wiki User
∙ 6y agoIf the motor is a three phase Direct on line connected, just interchange the two wires of three wires at the motor terminal.
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What size generator is needed to operate a 4 ton York air conditioning unit?
To answer this question the voltage and amperage of the unit must be stated. Once this is given the generator size can be calculated.
What is the power consumption on 3 ton air conditioning unit while using a generator?
It would be the same as if it were connected to a utility service. To find the wattage of a device multiply the voltage by the amperage. W = A x V.
What could be the problem on an air handling unit controlled by a three phase motor with two speed settings low and high that is tripping out its high speed contactor?
With this type of installation there should be two magnetic contactors for each speed. Check the full load amps of each speed of the motor and set the corresponding heaters of the respective contactor for the amperage of that speed.
How much does air conditioning freon cost?
AnswerIt depends on what type you are looking for.Expect to spend between $5,000 and $10,000 for a unit and installation of central air according the site getproquotes.com
Does current ever flow in the neutral wire?
In 120 VAC circuits, the neutral wire carries all the return current from the hot wire. In a single phase 120 VAC circuit, such as found in US homes, the neutral wire carries exactly the same amount of current as the hot wire (unless there is a fault in the device). The difference is that the neutral wire is connected to the ground bus in the load center (also called "breaker box" in the Southern US).In a three phase circuit, as was pointed out by another person, the neutral wire will carry any current that results from an imbalance in the phases. If the three phases are perfectly balanced, for example when connected to a motor, there will be no current in the neutral conductor. (In fact, in a three phase delta connection, there is no neutral. But I will not attempt to explain that here, beyond simply mentioning it.)Nevertheless, anything that causes an imbalance in the phases of a three phase system will cause neutral current to flow. The amount of neutral current in a three phase system may be calculated using the phase relationships of the three phases, provided the imbalance is known, or simply measured with a standard AC current meter. (However, I must qualify this by saying that three phase systems are complex and hard to understand. It is easy to be fooled when working with such a system, and I would not undertake it without a thorough review of the principles involved. They do not behave in a simple and obvious manner.) However, I do believe that the neutral wire in a three phase system is often much smaller than any of the phase wires, because it is not called upon to carry the full current, but only the relatively small currents resulting from load imbalances.In a 240 VAC system, such as is used to supply power for an AC unit in the US, again typically the neutral will not carry current unless there is some sort of problem. Rather, the current flows in the two hot wires. As before, the neutral wire is connected to ground at the load center, and is usually connected to the metal chassis of the device being powered, whether it be an air conditioning system, electric range, or hot water heater. This is to provide safety for the user, and also will help to trip the breaker if there is an insulation breakdown within the device.Modern 120 VAC systems in the US have three wires. A safety ground wire has been added, and this is always connected to the metal chassis, except in certain devices that have extra insulation, such as power drills and most lamps. This ground wire is only for safety purposes, and normally does not carry any current. While the neutral wire is also connected to ground at the load center, it is a current carrying wire in a 120 V system, so is not usable for grounding the chassis as in the 240 VAC system. However, if there is an insulation breakdown problem in the device, the safety ground will conduct current and trip the breaker at the load center.Interestingly, the fact that the neutral carries the same current as the hot wire in a 120 VAC system is used as the operating principle for Ground Fault Detectors. An electronic circuit in the GFD device compares the current in the hot and neutral wires. If they are not equal, the device trips a relay, removing power from the device. If the hot and neutral currents are not equal, this indicates an insulation breakdown, where some of the current is leaking to an improper place within the device. The Ground Fault circuit detects this and shuts down the device very quickly, preventing electric shock and potential loss of life.
When a Soldier is physically mission capable and has achieved all personal and unit fitness goals which phase of conditioning have been met?
Conditioning Phase
When a Soldier is physically missioncapable and has achieved all personal and unit fitness goals which phase of conditioning have been met?
Conditioning Phase
When a Soldier is physically mission capable and has achieved all personal and unit fitness goals which phase of conditioning have been?
Conditioning Phase
What is the different single phase unit price and three phase unit price?
If, by 'unit price', you mean the cost per kilowatt hour, then there is normally no difference between the cost of energy supplied whether by single-phase or three-phase supplies.
How many cooling vents should you have for a three ton air conditioning unit?
3
Phase imbalance on three phase compressor Can a phase imbalance cause a compressor to lock up mechanically even if power restored to unit?
yes
Unit to measured phase is?
unit to measure phase is degree
What exactly is a window air conditioning unit and would be considered as a cooling system?
A window air conditioning unit is designed to fit into a window opening. these can normally be fit into a hole made into the wall as well. They are definitely a cooling system and blow dehumidified cold air and in the case of reverse cycle hot air.
Power conversion formula for single phase to three phase conversion?
A 'watt' is the SI unit of measurement for power, whereas the 'British Thermal Unit' (BTU) is the Imperial unit of measurement for energy. Power and energy are two different quantities, so you cannot convert watts into BTUs. (Besides, who would use a BTU these days?)
How do you install an air conditioning unit?
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Do you have to replace your furnace if you replace your air conditioning unit?
If is a 2 stage air conditioning unit. You might want to replace the furnace.
What is a versatemp unit?
Air conditioning unit, company owned by clivet. Generally used on a water loop system offering a lot of energy conservation opportunities when using reverse cycle heat pump option. See Clivet website
