Nobu NBFS-48IDU Service Manual page 32

When the time on or time off is used, the clock of remote controller shall be corresponding to the current clock
and the timing times is less than or equal to 24 hours, when the timing time is reached, unit will start-up or
shutdown.
Emergency key function
There is a forcible execution key on the panel of indoor units and the air conditioner can running by pressing
the key when the remote controller is out of work or missing.
When pressing down the forcible execution key, then power up and enter the self-check program.
low pressure switch control function(for 7.5KW and 12kw unit)
1. low pressure switch didn't detect for three minutes after compressor start up.
2. if low pressure switch continuous act three minutes during compressor start up, unit stop running.
3. if low pressure switch continuous act three minutes in wait state, unit enter protect state.
4. low pressure switch didn't detect during defrost process and within six minutes.