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What is the difrent between LRA and BTU ? - Air Tools & Compressors

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One really has not much to do with the other directly

BTU - British Thermal Unit.- A heat measuring unit. IE:12,000 BTU (British Thermal Unit.) The amount of heat required to melt one ton of ice.

LRA - Lock Rotor Ampere-LRA is nothing but locked rotor current , generally it is located on compressors name plate, when ever pistons locked at a particular position the rotor does not move further at the time rotor draws large current, that current is located on name plate, by seeing that LRA we can know compressor rotor was locked

Posted on May 20, 2011

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How to calculate the capacity for the unit using LRA

Posted on Aug 20, 2017


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So far i didn't get watts on my compressor explaning LRA-does not help ! becouse don't have number to multiply by 220 V in order to get replacement supplyer need watts !

RLA= Rated load amps or running loads amps depending on mfg.
FLA= Full load amps
LRA= Locked rotor amps.
watts is voltage times current, So use 220 time the LRA get that watts or 220 times FLA to get that watts and
multiply 220 times RLA to get watts.

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That makes no sense. LRA is going to be for a motor or compressor. I've never heard of a 20562 BTU machine. You have to read the data plate on the machine, either indoor or outdoor unit will tell you. If you can't read the data plate turn the power off and look at the data plate on the actual motor itself. Good Luck!!

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