SYX66x Commissioning Guide
V1.10.3 300117
Page 38 of 61
Commission Mode Switch
– Off = Normal, On = Forces the outside sensor to 5’C and the room sensor to 18’C. This
allows commissioning during the summer period.
Note:
0’C will also be displayed for the Outside Air Sensor should it become faulty or become disconnected.
The controller will go into a Day Mode should this be the case.
Set-Up - Heating Mode - Night Setback, Opt/Comp, Timed On/Off, Optimiser
Night Setback operation uses the time schedule to decide between day and the night setback state. When in night
setback mode the controller maintains the required night set point and uses the night reduced flow set point.
Opt/Comp operation uses the time schedule to switch the heating on and off (off if required) in advance of the time
program to achieve the required occupancy temperature at occupancy time and also maintain the occupancy
temperature until the end of occupancy time.
Timed On/Off operation used the time schedule to enable the heating during the day period but will turn off the
heating during the evening subject to frost protection and a space sensor being fitted.
Optimiser - operation provides no boiler control for heating (HWS boiler call remains optional) it is used to drive the
pump/plant output to start and stop external services according to an occupancy requirement.
Opt YPlan Mode
– Upgrades old YPlan systems to have optimised start and compensated boilers when HWS not
in demand.
Set-Up - VT Set point
– Self Adaptive/Non-adaptive the engineer can select to configure the heating curve manually
or can let the controller tune the curve to suit the system performance. No adaptive value can be displayed.
Set- Up - Optimum Off
– Enabled/Disabled – the controller will not self-learn the heating up rate of the building. This
applies to the Opt/Comp and Optimiser Modes only. The adaption should be left enabled unless the application cannot
support sensible warming up rates or can remove influences from the performance. Enabled
– The controller will self-
learn and adjust the warming up rates based on actual performance factors. Heavily reliant on a good room sensor
location and effective heating in that location. TRV or Fan convectors must be set to allow the target space temperature
to be achieved. The adapted warming rate will generate an alarm i
f the value falls below 0.5’C per hour. At that time
the adaption will be halted and an investigation into the long warm up time is needed. This can result in saving energy
and improving plant performance.
