Air conditioner outdoor diagram with and without lock out relay

Air conditioner outdoor diagram with and without lock out relay

AC outdoor diagram without Lockout Relay 

An outdoor unit without a lockout relay restarts automatically after a fault clears. The thermostat energizes the contactor, sending power to the compressor and fan. This simple circuit is common in small AC systems but can cause short cycling and reduce compressor life during repeated faults

AC outdoor diagram with Lockout Relay 

An outdoor unit with a lockout relay provides enhanced compressor protection. When a safety switch trips, the relay keeps the system off until manually reset. This prevents repeated restarts, simplifies troubleshooting, and ensures long-term reliability — ideal for advanced residential and commercial air conditioning systems.

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