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When you turn the air conditioner condensing unit off these pressures equalize within five minutes. The HVAC air conditioner condensing unit compressor should not be started unless the air conditioning or heat pump system is at the static pressure. Before this happens to you, call the company you often deal with to maintain and repair your HVAC system(s). If you have an older mechanical thermostat its a good idea to make sure you have a delay timer in your condenser. HVAC Tips: Helping You LearnYou can add energy savings by placing a blanket wrap insulation around your water heaters.
A bad condenser fan motor is a common problem with HVAC units, all year long they are exposed to the elements and are required to turn on and off constantly blowing the air away from the condenser. A condenser fan motor is responsible for pulling air out of a unit pulling it out past the condenser, much like a fan and radiator in a car or truck.
A simple way to tell if a unit has a bad condensing fan motor is to turn the unit on and stand next to the condenser. When a fan motor is not spinning a small stick can be used to reach the blades and give them a nudge which sometimes will get it running again but will soon stop. Be careful when working with a fan motor the blades turn at a high RPM and can cause injury. Always be aware that the fan may be good and the problem may be something else such as bad connections, blown fuses, contactor, or bad start run capacitor.
Contactor: A Contactor can become pitted and dirty with use and can build up a resistance or become open. Start Run Capacitor: The Start Run Capacitor is often combined into one capacitor called a Dual Run Capacitor with three leads, but can be split between two separate capacitors. After replacing a bad condensing Fan Motor a new Start Run Capacitor should always be installed. If the unit has two capacitors then one is the Run Capacitor and the other is the Start Capacitor. Hint: It is a good idea to take pictures, or write down and note wiring connections and wiring colors for future reference before starting. If the exact model number can be found then that would be all that is needed besides verifying the numbers before installation. But often the model number is unavailable, or it is cheaper to use a universal motor as a replacement.
Here is two common capacitors, the one on the left is a Dual Run Round Capacitor while the one on the right is Run Oval capacitor.
The Dual Run Capacitor is nothing more than two capacitors in the same housing; while the Run oval is a single capacitor and a HVAC system will usually have two.
The voltage can go higher if necessary but never lower while the MFD (uf) should always be the same.
To order a replacement for this capacitor it would be 55+5 MFD (uf) and 440 volts AC Dual Run Capcitor.
Testing a HVAC capacitor is done with a HVAC multi meter, the multi meter must be cable of reading the range that a HVAC capacitor can have. Be sure the power is off on the HVAC unit by turning off the breaker, or pulling the disconnect.
It is a good idea to take pictures of the wiring connections and motor to refer back to if necessary.
If it is a three wire motor then one connection will go to the FAN on the new Start Run Capacitor.
If it is a four wire motor then look at the schematic on the side of the motor for wire color.
All information written here is for HVAC students, technicians or properly trained personal.

If you have a meter it is best to test it, if not they are cheap to replace, simply be sure to get the correct one. I replaced the dual capacitor and a run capacitor that was attached to it and now the fan is working again. The explanation of the contactor also helped clarify one of the items I was wondering about. Do not attempt any HVAC furnace repair, air conditioning repair, heat pump repair, wiring, HVAC installations or other HVAC repairs without the proper training.
HVAC systems can be dangerous and lead to injury if proper safety procedures are not taking. Air Conditioners and Heat Pumps use the HVAC refrigeration cycle to transfer heat from a place where it is not wanted (inside absorbing heat with the evaporator coil) to a place that makes no difference (outside using the condensing unit)(in the cooling cycle).
I have responded to calls where the air conditioner or heat pump condensing unit was not equipped with a delay timer and the air conditioning or heat pump condensing unit was inadvertently started before the pressures were allowed to become static. The capacitor for your compressor can be replaced for a minimal cost compared to replacing a compressor. Ask to speak with the HVAC service manager or HVAC technician that has worked on your HVAC equipment.
Additionally, for electric water heaters, you can have a timer added to the power circuit to turn the water heater off in times when there is no usage.
Often they will freeze up after the bearings seize or they will draw the wrong amperage and stop working.
During the summer when it is hot it will blow the heat away from the condenser through its fins cooling down the Freon that flows inside. For example during the summer when it is hot and a unit is turned on it will at first blow cold air then after a short period it will stop and blow room temperature air.
If the motor will not spin at all then the bearings are most likely are bad and the motor will need to be replaced. The Start Capacitor gives a fan motor the torque it needs to start spinning then stops; while the run capacitor stays on giving the motor extra torque when needed.
If a Run capacitor goes bad then a motor can turn on but the running amperage will be higher then normal causing the motor to run hot and have a short life expectancy. The easiest way to do this is take the motor to a local HVAC supplier and have them cross reference it, and match it to the bad motor. Basically the fan is pushed onto the shaft until it reaches the same location as it was before pulled. A capacitor can be bought at a HVAC supply company there a usually at least a few even in a small town, also online eBay is a good place to look.
The multi meter is on Farads and the leads are on C and FAN (positive and negative do not matter).
The fan blades must turn correctly, and should be placed to pull air out of the unit, if they are placed in the wrong direction the unit will not work correctly. There should be a schematic on the side of the new motor showing which color wire goes were. The other two wires are for power and will go to the contactor for 120 volts on each leg for a total of 240 volts. Two wires are for power and go to the contactor the other two wires will go to the capacitor. If you are very careful to check the coloring of the wires then they can be cut and wire nuts can be used to connect to the old wires. Two to 120 white wire power and black wire hi speed and one brown wire to oe 3 leg capacitor. Also be sure the power is off and take pictures before removing anything so you can always refer back.
The heart of any HVAC air conditioning, heat pump, or refrigeration system is the compressor which pumps the refrigerant through the HVAC air conditioning system.

Often the compressor inside the condenser is locked up, the run capacitor is shot, a fuse is blown, the compressor is damaged mechanically or electrically beyond repair, or a combination of any of these things mentioned. If the compressor is locked up there is a chance that it can be unlocked (note the word chance). The fan does not run constantly only when needed but if twenty minutes or more go by and the fan does not kick on then there is most likely a problem. Opening up the side panel and checking the voltage is often the quickest way to be sure the unit is getting power. The resistance can be checked with a meter from one side to the other if the resistance is high then it should be replaced as a Contactor should have very low resistance. The larger number 55 MFD is for the compressor while the lower number 5 MFD (uf) is for the fan motor.
The lower number is for the fan motor which is rated at 5 MFD (uf), and it reads 5.3 MFD (uf) so it is good.
Although this is not recommended it can be done in extreme cases were the wires are all but impossible to get through the unit.
There is a temperature rating on the name plate of each motor if it goes above this it can shut off and possibly damage the motor. Replacing a condenser fan motor can be dangerous do not attempt this without proper electrical training, construction training and safety practices. When the refrigerant leaves the compressor it is compressed and therefore a higher pressure than it was before it entered the compressor inside the condensing unit.
They should be more than happy to answer your question…………and if they are not sure ……check to see if the condensing unit is equipped with a delay timer. A bad motor can suddenly start working again and if not bolted in place will spin out of control causing damage. The majority of units use 240 volts this can be verified by looking at the name plate on the HVAC unit. Different speeds may be necessary to adjust airflow for the specific installation, or for different operating modes. This pressure remains constant (give or take under certain conditions) until it passes through the metering device where the pressure and temperature are reduced.
If your HVAC system is not equipped with a delay timer and you turn the system on within five minutes of turning it off, the compressor inside the condenser must start against that higher pressure. If this doesn’t unlock the compressor then you will have to replace the compressor or the air conditioning or heat pump condensing unit. You may want to have the model number, serial number (for both the condenser and air handler), and type of thermostat you have. Most timers can be customized and set for different times so that the water heater is turned off for most of the day and night. The same thing can happen if a new motor is installed, or problem fixed and the power is on. The Run Capacitor is designed to keep a constant and even flow of power going to the Motor. This low pressure remains constant (again give or take under certain conditions) until it again reaches the compressor inside the condensing unit and is compressed again. Should I be running a second capacitor for just fan and run the original hot jumper wire for the compressor 3 leg compacitor?

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