Sanyo MCO-19M Service Manual page 40

<Alarm delay time>
Setting range of both alarm delay time for high/low temperature alarms, and high/low CO2 density alarms is 0~15 minutes.
(Factory default: 15 minutes)
Setting range of high /low O2 density alarm is 0~30 minutes. (Factory default: 30 minutes)
O2 density alarm will emit after twice of setting time elapses
Note) Even if you input a value more than 15 minutes, alarm delay time will be set in 15 minutes.
<Ring Back time>
Setting range is 1~99 minutes. (Factory default: 30 minutes)
<Door open alarm delay time>
When an outer door leaves open, an audible alarm sounds after predetermined time elapsed.
Setting range of door open alarm delay time is 1~30 minutes. (Factory default: 2 minutes)
Note) When you input "0" minute, door open alarm delay time will be set in 1 minute.
Even if you input a value more than 30 minutes, door open alarm delay time will be set in 30 minutes.
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