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Can I put a lower amp fan motor on a condenser if the one has a higher amps

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Jason,

You air conditioning system is designed as an entire unit. All the parts were selected to work together.

The condenser fan motor has been selected to match system voltage, provide enough horsepower and RPM to spin the a fan with "x" number of fan blades with fan blade pitch or angle that will pull enough air across the condenser coil to cool the hot refrigerant gas enough so that by the time it reaches the expansion valve it will be in the ideal temperature range to provide maximum cooling in the evaporator coil.

Changing components with unlike replacements creates strain, inefficient cooling and potentially early failure of parts.

Posted on May 07, 2014

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Posted on Jan 02, 2017

heatman101
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SOURCE: Original AC Condenser fan motor had three wires L1

Hi,
Yes, that can be confusing...hook the tan wire with the white strip onto the same line wire as the one going to the capacitor...usually the L2 wire....so then in reality you have the two tan wires hooked onto the common and the F terminals of the cap...

heatman101

Posted on Aug 16, 2010

  • 674 Answers

SOURCE: I bought a replacement Dayton electric condenser

The tan/white wire can be insulated/capped and not used. Use and ohmmeter to take a resistance reading between the tan/white wire and L1 & L2. There will be no resistance between the tan/white wire and one of the others. This will be the common wire. Connect it to one side of the contactor. Connect the tan wire to the fan terminal on the contactor and the other wire to the common terminal on the capacitor (that is if you have a 3 terminal capacitor, if you have a 2 terminal capacitor connect tan to one side and the other wire to the other). Then connect the other side of the contactor to the common terminal on the capacitor (on a 2 terminal capacitor connect the contactor to the side that doesn't have the tan wire on it).

Posted on Aug 16, 2010

  • 127 Answers

SOURCE: NEW CONDENSER FAN MOTOR DRAW

The capacitor may be weak if it has not been changed with the motor, which will cause excessive amp draw. Also may need condensing coil cleaning to reduce static pressure on the fan.
*Some motor ratings do not reflect what is actually needed for proper operation in some cases a higher amp motor is required.

Posted on Aug 27, 2011

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Condenser Fan Motor Operation ' FAQ ' Sub-Zero and Wolf

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Hi, not sure which motor you are talking about, the indoor blower, or the outdoor condenser fan motor? Doesnt matter. If the motor is shutting down, its overloading and going off on its internal overload. Cools down, resets and repeats this again. Make sure you have not miss wired it. Even though the run cap and motor is new, doesn't always mean they are good. You need to look at the R.L.Amps on the motors data plate, to see what it is rated for when running.You MUST have an amp probe meter to check each hot leg to this motor to see how many amps it is pulling while under a load. If it is the condenser fan motor, and if the blade/prop is not in the right place on the 1/2 " shaft, you can move it up or down to adjust the amperage on the motor. When you do this, it causes the motor to draw either more or less air across the coil, which you need less to reduce the amperage and load on this motor. I have seen this happen many many times, but like I said you will need a amp probe meter to see what the motor is drawing. If you dont have one, just move the blade a 1/2" in one direction or the other until the motor keeps on running. This will work, just time consuming, and you will never really no how many amps its drawing.You can pick up a good clap type amp meter at Sears, a Craftsman for around $29.99. It is well worth the bucks to have. You can also check the uf's on the run cap. The voltage 370 or 440, food for thought is you can always use a cap thats higher in voltage but never lower. Make sure you have the correct MFD as I am sure you know this.So, check the voltage from the new contactor to the motor, the run cap, and most important is how many amps it is drawing and you can wrap it up. I wish you the best. Please let me know, keep me posted, and rate me if you please to.
Sincerely,
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The capacitor may be weak if it has not been changed with the motor, which will cause excessive amp draw. Also may need condensing coil cleaning to reduce static pressure on the fan.
*Some motor ratings do not reflect what is actually needed for proper operation in some cases a higher amp motor is required.

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