What Is A Contactor In An Air Conditioning System? A Bad Contactor Can Lead To Major Failures!

!±8± What Is A Contactor In An Air Conditioning System? A Bad Contactor Can Lead To Major Failures!

A contactor is defined as an electrical relay used to control the flow of power in a circuit. Many people also refer to them as a relay. A relay is actually defined as a device that responds to a small current or voltage change by activating switches or other devices in an electric circuit. In the real world of heating and air conditioning, what this means is a contactor is capable of handling a higher current than a relay. Relays are usually reserved for small pilot duty applications. Most heating and air conditioning service technicians will not call a contactor a relay.

We will be discussing a typical single pole or double pole contactor as would be found in a modern home using a split system gas furnace with air conditioning or a heat pump. Single poles have only one set of contacts while double poles have two. Single poles are used by many manufacturers of equipment. Single poles only break half the power to the fan motor and compressor while double poles break it all. We feel most heating and air conditioning service technicians probably like breaking both sides, at least we do.

Contactors actually have at least two separate circuits in them. (Some commercial contactors have many circuits). One circuit is the low voltage coil circuit and the other is the load circuit.

The coil circuit in MOST home air conditioning or heat pump systems uses a 24 volt coil, however, there are some systems that use a 230 volt coil in conjunction with a small relay that switches the contactor on and off. These 230 volt coil systems are predominantly on older systems or commercial units these days. Before changing any contactor be sure the correct coil voltage is used or a burnt coil may result. The coil voltage will be marked on a small tag on the side of the contactor. The line/load circuit in the home contactor is used to supply 230 volts to the load side of the equipment from the line side. In other words, the main 230 volt power coming from the power source of the home flows across the contacts in the contactor to the line side (compressor, fan motor and any other component) when the coil is energized by a call from the home thermostat for cooling or in a heat pump for cooling or heating. When the thermostat isn't calling for the unit to be running, the coil releases and the contacts open causing the compressor and fan motor to stop.

Thousands of on and off cycles however, cause a couple of problems. The most obvious problem is that the contacts themselves get burnt from constantly arching as they open and close the 230 volt connection. Contacts can actually weld themselves closed after a period of time. These thousands of cycles also cause the plastic sliding mechanism to wear. This wear often causes the contactor contacts to stick closed even though the thermostat has stopped sending an electrical signal to the coil. When this happens it usually goes unnoticed by the homeowner and can quickly lead to a frozen evaporator coil and or compressor. When a frozen condition exists the oil in the compressor is also frozen and can't lubricate the internal parts inside the compressor. This conditions amounts to the same thing as running your vehicle with no oil! The other issue with burnt contacts is that there may be a voltage drop and added heat sent to the compressor and fan motor since the contacts are burnt.

To put things in perspective, changing a contactor is very cheap protection against having to replace a ,000- ,500 compressor. Contacts should be examined every year before operating the unit and usually should be replace every five years or so.

What Is A Contactor In An Air Conditioning System? A Bad Contactor Can Lead To Major Failures!

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Benefits of Halogen Oven

!±8± Benefits of Halogen Oven

If you're planning a kitchen stove, then you should consider a halogen oven. Halogen ovens used in cooking methods and advanced technologies are able to offer delicious dishes all the time. They are much faster and more compact than a conventional oven.

The biggest advantage of using a halogen oven is portability. Since it is very compact and handy, no need for a large space for storage. You can take him wherever you want and if youDo not use. You can also take them out for all occasions and family gatherings. Even if they are small, they can cook some foods, such as a chicken medium and some vegetables.

The containers are made of glass so you can keep an eye on the food during cooking and adjust the temperature accordingly. Halogen ovens are capable of cooking 40% faster than a conventional oven and you can use to save cooking time. You can save up to 75% of energy from bothCooking food at low temperatures or reducing the total time of cooking. The thermostat controls here can be used to control the temperature between 25 and 250 degrees. They also have a timer to control the cooking time about 60 minutes.

Halogen ovens are really good for cooking chicken is much softer. Most of these are self-cleaning ovens and the glass can be placed on a dishwasher for easy cleaning. Normally, halogen lamps heat the air inside and the air is forced by a fan. Thishot air is transferred through the food and then the food is cooked more evenly. There is no need to thaw the food more, but they can put it directly in the oven for cooking. This contributes significantly to save time. For example, if you buy frozen raw meat or just something clean. If you decide to cook, you can easily put in the oven.

Today, halogen ovens are equipped with many features yet. They find it very convenient, healthy and delicious food in ashort time. They come in many different formats so you can get the ones you get at most. In fact, more than just a little when your family is less than two.

You can also easily the food from the oven, without the need to bend down. You do not need additional oil or fat to cook in these types of furnaces. Taken together with a halogen oven can bake, grill and cook all types of food. Just make your kitchen very interesting and enjoy delicious foodany time!

Benefits of Halogen Oven

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Magic Chef Repair

!±8± Magic Chef Repair

Before obtaining a repair magic chef, you may want to look into some trouble shooting himself. If you have problems with your fridge on some of these:

The refrigerator has stopped

Listening to the side wall to see if you hear a fan or a motor. If you can not then he stopped, his rest only on the basis of the thermostat setting. Before calling a repair technician for Magic Chef, set the thermostat lower back and listen to the engine. Anotherthing to check is the outlet. Put another tool and see if it boots. If it is the electrical device, and yet it does not work, then you could get a repair magic chef. The problems may be with the compressor thermostat, and wiring, defrost timer and overload.

What happens if the cooling is poor? A refrigerator that works, but not cooling very well the problems with the evaporator and condenser coils. If this is the case, you probably need to obtain aRepair.

My Chef magic works, but it is strong.

Listen to see if the noises coming from inside, behind or below. Automatic defrosting refrigerators have an internal fan can be extraordinary strong. You will need to obtain a repair magic chef, if that's the case, because the evaporator fan motor can not be lubricated.

If the noise comes from behind then you may have problems with the compressor, condenser fan motor or the defrost timer. If this isCompressor, which makes the noise then you should replace them.

Sometimes there is a buildup of deposits on the condenser fan and only needs a clean. If this is not the trick then you have to replace the motor.

Sometimes, the electric motor in the defrost timer is strong and the timer must be replaced to solve the problem.

Magic Chef Repair

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Replacing a thermostat - Wiring Colors

!±8± Replacing a thermostat - Wiring Colors

Replace the thermostat without even Denver HVAC technician can be quite shocking if you do not like the wiring correctly. Inside the thermostat there are several terminals, the need to connect with the right cables. The R terminal is the power thermostat. R means red, in case of artisans Colorado Heating cables are the red to the terminal. This power comes from the transformer. The transformer is normally in the condensing unit or air handler split system.Because they have the power, it is a good idea to kill the power to both the condenser and the air handler before working on the thermostat.

The RC terminal is the power for cooling. Some HVAC systems have two large transformers, one for cooling and heat. In this case, the power system to the terminal ac thermostat. A jumper between RC and RH can be installed for a single transformer heating and cooling. The RC terminal is also red.

The RHTerminal is warming. This is also red and the RC can be skipped.

The Y-terminal is yellow and goes to the compressor relay. Some HVAC Specialists Denver with a terminal strip on the control board air treatment, the bonded joint does not need. Y2 is blue and is usually code for a cooler second stage. If you have two compressors, two should work the thermostat itself. Heating Denver and most airlines do not need one to two cooling stagesCompanies.

W is the terminal heating. W is for white-terminal. This should be directly to any heat source, be it a furnace or boiler. W2 is the second stage of heat and is usually brown. This is for the gas-cooker with low and high settings. Heat pumps use W2 additional heat.

G is for green, and goes to the blower relay inside.

C stands for common and not a specific color, although black is often seen. Consuming digital thermostats, electricity,common line is needed to close the circuit to 24 volts.

Orange "O" and "B" Blue is for heat pumps. Rheem Ruud heat pumps use the terminal B to the cooling valve. Other producers use the HVAC terminal O. Trane, Lennox, Goodman, Ducane, Heil, Carrier, Fedders, Amana, Janitrol and are generally up to the terminal O of HVAC contractors in Denver addiction.

It is equipped for emergencies. This has no color standards, but should the heater relay or e-connect terminalEdge strips.

S1 and S2 are sensors for outdoor air. This has no color standards, but must use a shielded cable to avoid interference and reduce the possibility of damage to the waters outside. Warning: These colors are the default values. The person wiring thermostat can be used non-conventional color coding.

Replacing a thermostat - Wiring Colors

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Flex-a-lite 31165 Variable Speed Control Module

!±8± Flex-a-lite 31165 Variable Speed Control Module

Brand : Flex-a-lite | Rate : | Price : $99.95
Post Date : Sep 06, 2011 18:15:21 | Usually ships in 24 hours

Flex-a-lite 31165 Variable Speed Control Module

The Flex-a-lite Variable Speed Control Module is an adjustable fan controller that can be set to have your fans come on at any temperature between 160-240F. When fans come on with temperature, they are activated at 60% run using a soft start feature, which greatly reduces startup amperage. As the temp rises about 10 degrees, the controller gradually increases fan speeds up to 100%.

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