Before turning on an air conditioner, it is recommended to let it sit for about 5 minutes after it has been turned off. This brief resting period allows the refrigerant pressure in the system to stabilize. Turning it on immediately after shutting it down can potentially strain the compressor and lead to inefficient operation.
Additionally, if the air conditioner has been transported or stored horizontally (e.g., during installation or maintenance), it is advised to wait for a minimum of 24 hours before turning it on. This allows the refrigerant and lubricating oil to settle back into their proper positions, ensuring the unit operates effectively and efficiently.
Always refer to the manufacturer's instructions and guidelines specific to your air conditioning system to ensure proper operation and maintenance.