Checking the Run Capacitor

If the compressor is not operating or is not operating

correctly, the run capacitor may be the cause and Figure 16 should be checked.

A bad capacitor will typically be either shorted or open. Visually inspect the body of the capacitor; look for any sign of the housing bulging, splitting or leaking ﬂuid.

Replace the capacitor if there is any sign of physical damage. Use a capacitance meter to measure the capacitance of the capacitor. If it measures 25uF ±5%, it is good. If the value is outside this tolerance, the capacitor is bad and should be replaced. If a capacitance meter is not available, use an Ohm meter to check the condition of the capacitor. Place one meter lead on each of the capacitor terminals. If the resistance value is increasing or decreasing, this indicates it is charging or discharging and that the capacitor is probably good. If the resistance is inﬁnite, it shows the capacitor is open or the resistance is steady, that the capacitor is partly shorted. In either case, the run capacitor should be replaced with a unit with the same speciﬁcations and dimensions.

Capacitor Terminals

Figure 17
COMPR.		THERMAL PROTECTOR
MOTOR	C
AUX.		MAIN
S		R
		RUN CAPACITOR
		26

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