This is probably NEC1 IR protocol.  If that's true, then each code, e.g. 0x24020df for Power On, should be thought of with a prepended zero-- 0x024020df.  The sheet doesn't specify exactly how this should be parsed, but the possibilities are:

Device = 0x40 --------0x024020df
Sub device = 0x02 ---0x024020df
Function = 0xdf -------0x024020df

A second possibility is
Device = 0x02
Subdevice = 0x40
Function = 0x20

Third
Device = 0x40
Subdevice = 0x02
Function = 0x20

I'll guess that this is NEC Device 0x40 (or 64 decimal).  Using IrScrutinizer, on the Generator tab select NEC1 as the IR protocol, enter 0x40 into the D field, 0x02 into the S field and 0xDF into the F field.

0000 006C 0022 0002 015B 00AD 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0041 0016 0016 0016 0016 0016 0041 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0041 0016 0041 0016 0041 0016 0041 0016 0041 0016 0016 0016 0041 0016 0041 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0041 0016 0016 0016 0016 0016 06FB 015B 0057 0016 0E6C

And if that doesn't work, try other combinations.