Option 11  - Start-up method
Your thermostat can start up the system in three di erent 
ways. Press + until Option 11 is displayed, use Λ and V to select 
required setting.
Setting 0 - Normal: Heating is turned up or down at the programmed times.
Setting 1 - Optimum start control (OSC) or Comfort Setting: This allows you to 
programme the time at which you would like to be up to the required temperature. 
The thermostat then calculates how soon before the required time the heating is 
turned up. This will vary with weather conditions ranging from a maximum of 120 
minutes to 0 minutes before the programmed event time. This setting must be 
used together with option 12 to match the optimiser setting to the building in 
which it is installed.
Setting 2 - Delay start or Economy Setting: This is an alternative to OSC. Set the 
event times in the normal way taking into account the time that the building 
takes to heat on an average day. The thermostat monitors switch on time, actual 
temperature and wanted temperature and delays the start of the heating if the 
actual temperature is close to the programmed temperature.
Option 12 - Optimum start control pre-heat setting (Option 11 set to 1)
Press  + until Option 12 is displayed, use Λ and V to select 
required setting (only active if Option 11 is set to 1).
The optimum start control must be adjusted to match the 
building energy characteristics. Use the Λ and V keys to
selected the required pre-heat period. The table below suggests typical settings.
If the building fails to reach temperature on time, increase the setting by 15 
minute steps each day until the correct setting is found.
If the building reaches temperature ahead of time, decrease the setting by 15 
minute steps each day until the correct setting is found.
0:15 15 mins, warm air system, well insulated building
0:30 30 mins, warm air system, well insulated building.
0:45 45 mins, warm air system poorly insulated building.
1:00 60 mins, radiator system, light weight well insulated building. 
(Factory Setting)
1:15 75 mins, radiator system, light weight medium insulation.
1:30 90 mins, radiator system, medium weight poorly insulation.
1:45 105 mins, radiator system, heavy weight building, well insulated.
2:00 120 mins, radiator system, heavy weight building, poorly insulated.
User Instructions
GB