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InRoom Precision AC Tech Data Manual80
H. SECONDARY POWER SUPPLY
1. 50 Hz cooling units shall have a secondary power supply option that is controlled
automatically to switch from a main power supply to a secondary power source in the event
of a power outage using a digital electronic controller.
2. 50 Hz cooling units shall have a secondary power supply option that is controlled manually.
The cooling unit may be manually switched from the main power supply to a secondary
power source at a separate external switch using a digital electronic controller.
3. 60 Hz cooling units shall have a secondary power supply option that is controlled
automatically to switch from a main power supply to a secondary power source in the event
of a power outage using a mechanical controller.
4. 60 Hz cooling units shall have a secondary power supply option that is controlled manually.
The cooling unit may be manually switched from the main power supply to a secondary
power source at a separate external switch using a mechanical controller.