Honeywell SDC Service Manual page 61

SDC / DHC
EN2H-0221GE51 R0812
Switching time programming (program P2 and P3 enabled)
Upon accessing the menu-selection level, the "Timeprograms"
menu always appears first. Enabling of programs P2 and P3 in
the "System Parameters" menu (see 5.2 Menu-selection level, pg.
48 ).
HC Direct heating circuit
MC-1 Mixed heating circuit 1
MC-2 Mixed heating circuit 2
DHW Hot-water heating circuit
Hcy Heating cycle
Operation
61