After the air conditioner is commissioned, the indoor temperature is in a reasonable state, and the suction pressure is not lower than ( ).

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Before the UPS5000 is powered on, it is necessary to check that the UPS input switch, bypass switch, output switch, maintenance bypass switch, battery open) have all been placed in the "OFF" state.

Which is not a routine maintenance item of the ECC800 power module?

If the customer load cannot be power-off, what should be taken care when closing the maintenance bypass switch? (Multiple choice)