TK 54343-18-MM-EN
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Figure 35. Capacitor Box Components (Single Phase Units Only)
1. Electric Motor Run Capacitor 3. Start Relay
2. Electric Motor Start Capacitors
Electrical Contactors
Test the contact points by checking the voltage drop across each set of points when the contactor is energized and the
system is operating. If the voltage drop across a set of points is more than 0.25 Vac, replace the contactor.
Test the contactor coil as follows:
1. Check the voltage to the coil. It should be at approximately 12 Vdc. If not, check for an open circuit.
2. Check the voltage after the coil. It should be 0 volts. If not, check for an open or high resistance in the circuit to
ground. If the voltage is 0 but the contactor does not pull-in, the coil is probably open. Check the resistance to verify.
It should be approximately ohms.
Compressor Motor Contactor
This contactor provides the AC power to the compressor motor. It is energized for Electric Standby Operation.
Compressor Motor Contactor Replacement
Removal
1. Turn the unit off and disconnect the electric standby power supply.
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