Unigas G258A Manual Of Installation - Use - Maintenance page 155

SCH2= 0.5x (SPH - SPL)
SCL2= -0.5 x (SPH - SPL)
Example:
SPH= max. 130° C
SPL= min. 30° C
SCH2= 0.5 x (130 - 30) = 50
SCL2= -0.5 x (130 - 30) = -50
11
With external setpoint
C111 configuration code = X1X1
With setpoint modified by independent management system
C111 configuration code = X9XX