How To Test Amp Draw On Heater Blower Motor

how to test amp draw on heater blower motor

How To Test and Check Single phase Electric Motors
TEST 1: Testing The Amperage Draw Of The Blower Motor The very first thing that we're gonna' do is test the amperage draw of the blower motor. What we want to do is make sure that the blower motor is using less than 30 amps (when its running).... The way we're going to test the blower motor is by manually applying battery power and ground with jumper wires or a power probe. NOTE: If you use a jumper wire, make your own fused jumper wire to apply battery power to the blower motor (as a safety precaution against shorting the jumper wire to …

how to test amp draw on heater blower motor

Service Clinic Why and How to Test HVAC Blower Motors

The current draw in amps needs to be measured with an ammeter as a dragging blower is generally what kills a resistor to begin with, much less 5 of them. Spinning easily does not mean that much. A couple of years ago the blower in my old Lincoln got where it would balk and become inoperative on rare occasions and this usually points to a faulty blower motor....
The only way for a roots blower to draw more current from its drive motor is for the blower discs rubbing, constriction of either discharge or suction ports or a failed pressure relief valve. Any condition that will attempt to control the air flow will result into the equipment drive drawing more amps.

how to test amp draw on heater blower motor

Blower motor AMP draw hvac-talk.com
Blower motor resistor problems. Problems with a blower motor resistor are common in many cars. The most common symptom of a failed blower motor resistor is when the heater fan only runs at high speed and doesn't work at low speeds. how to download itunes podcast without itunes If you don't see a change in voltage on terminal 2 of the blower motor when adjusting the fan control knob than check for power on terminal 2 of the fan control amp and for ground on terminal 1. If you have power and ground replace the fan control amp.. How to draw a fish with big lips

How To Test Amp Draw On Heater Blower Motor

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How To Test Amp Draw On Heater Blower Motor

Locate the fuse for the blower motor in the owners/service manual. Test the fuse, with the ignition key on, using the 12-volt test light. Attach the clip lead of the test light to a good ground like a bolt screwed into metal, and touch the sharp probe end to the terminals on the fuse.

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  • Calculate the amps used by dividing the wattage by the voltage. For example a 500-watt motor -- running on 50 volts -- will draw 10 amps. A motor with the same wattage -- running on 20 volts -- will use 25 amps.
  • Blower motor breakdown can be the result of anything from old age to failed bearings, high amp draw, electrical failure in the windings, dirt accumulation, and more. Knowing how to troubleshoot and diagnose problems with these motors is an essential skill an HVAC technician must possess.

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