Zehnder IRS Manuel page 24

4.4.1 Enable/disable a daily programme
EN
Press P1 or P2 briefly
To suspend the programme while it is in progress, press P1 or P2 briefly.
4.4.2 Setting a daily programme
A Press and hold P1 or P2
B
15-minute
+ -
C
P1 P2
If 10 seconds passes without a key being pressed
during setting, it will quit without saving.
4.5 Weekly programme P3
It is necessary to set the clock before selecting mode P3.
The Comfort temperature is the one you specified in section 4.3.
The Eco temperature is the Comfort temperature minus 3.5°C.
NOTE:
4.5.1 Enable/disable programme P3
A short press on P1 +
P1 +
OVErrIDE:
EN