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Calculate expected amp draw for HVAC motors, compressors, and heaters. Compare to nameplate RLA/FLA to diagnose electrical problems.
Measuring amp draw is the most fundamental HVAC electrical diagnostic. Comparing actual amp draw to the nameplate RLA (Run Load Amps) tells you whether components are working properly. High amps usually indicate a failing component.
A bad run capacitor causes the compressor or fan motor to draw 10-20% more amps than rated. Dirty condenser coils raise head pressure and amp draw. A failing contactor with pitted contacts creates resistance, reducing voltage to the compressor.
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