I have the same thermostat with the data sheet you refer to, but there seems to be more as it states "See Operating Instructions for more Information on this special feature." Anyone come across those (operating instruction)?
Hoglou the DH & BK the DW (retired and happy)
WestGA KM4HQQ 146.640mhz
L'IL Foot" 2014 Sunseeker 2300
"Harry" the JK toad in the mirror
Check out the "mods" in the albums