Hitachi RAK-25N5 Instruction Manual page 13

Explanation of the sleep timer
The device will control the FAN SPEED and room temperature automatically
so as to be quiet and good for people's health.
NOTE
If date or current time is not set, sleep timer can not be set.
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If you set the sleep timer after the off-, on/off- or off/on-timer has been
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set, the sleep timer becomes effective instead of the off-, on/off- or
off/on-timer set earlier.
You can not set other timer during sleep timer operation.
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After sleep timer time is up and when press sleep button again, the
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sleep timer will be set as last setting.
Sleep timer effective only once.
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