What is the running amperage of a blower?
Assume that when the technician measured the pulleys and obtained the motor information, that a motor running amperage measurement was taken. This amperage is for the original conditions with a motor pulley of 8″, a blower rpm of 875, and the 3000 cfm airflow rate. The running amperage under those conditions was found to be 16 amps.
How does a motor work in a blower?
A typical blower and motor pulley combination is illustrated in figure 13- 1. As illustrated in figure 13-2, a motor drives a motor pulley at 1750 rpm. The v belt transfers the rotational motion to the blower pulley, which operates a blower.
What are the symptoms of a bad blower motor relay?
3. Melted relay. Another more serious symptom of a problem with the blower motor relay is a burned or melted relay. Relays are exposed to high current loads and can sometimes get hot when they develop problems.
How is the RPM of a blower calculated?
The blower is used to move a given cubic feet of air per minute through an air conditioning system. Figure 13-2 In the above diagram, (See figure 13-2) the two pulley sizes are known and the rpm of the motor pulley is known. The motor pulley rpm is read from the motor data plate. Using a ratio the blower rpm can be found.
What causes a fuse to blow on a blower motor?
If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power in order to protect the system.
What causes a bad or failing blower motor relay?
Blown fuses. One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current…
When do you need to replace a blower motor?
If you don’t feel any airflow coming out of the vents, it may mean that a problem with the blower motor has developed to the point where the component is entirely inoperable. In this case, you’ll have to replace it with a new motor.
What does a blower motor do in a HVAC system?
The blower motor is a component in your HVAC system that blows the conditioned air through the vents in your home. It takes the cool air created by your air-conditioner and circulates it throughout your indoor space to ensure that the temperature reaches the level dictated by the thermostat.
How many amps does a 10 hp blower draw?
The 16 amps is a full 7.5 amps under the FLA rating of the motor. The FLA is the full load amps or the amperage the motor will draw if it is doing its rated horsepower worth of work. For this motor, if it is doing a full 10 HP work load, it would draw 23.5 amps, it is only drawing 16 amps. This shows there is more HP available.
What should the CFM of a blower be?
The goal is to increase the cfm from 3000 cfm to 4000 cfm. Changing a pulley size or making an adjustment on the motor pulley if it is adjustable will accomplish this. The most economical and practical pulley to replace is the motor pulley.
How often does the cold air blower run?
Cold air blows out it will run for an hour or two and before it gets to temp the blower motor shuts off while the compressor continues to run. Then at this point the evaporator coils tend to freeze (sometimes). Then, the blower motor seems to try to run every 10 minutes or so.
How often does the AC blower motor turn off?
The AC will start out the day working great! Cold air blows out it will run for an hour or two and before it gets to temp the blower motor shuts off while the compressor continues to run. Then at this point the evaporator coils tend to freeze (sometimes). Then, the blower motor seems to try to run every 10 minutes or so.
What happens when the Echo leaf blower dies?
About Echo gas powered leaf blower. The engine starts, then the engine dies. TO keep the engine running if I have to keep re-adjusting the cold start/run choke. I can’t do that when the blower is on m … read more
How does a furnace blower turn on and off?
The blower spins up, runs at a low speed for a few seconds, and turn off again. Eventually, after many attempts the blower fan will kick on and the AC will begin to cool again then rinse and repeat all day.