SYX66x Commissioning Guide
V1.10.3 300117
Page 43 of 61
Outside High Set point
– If the outside air sensor goes above this value then the heating circuit will be switched to
Outside High
Mode. The heating will come back on if the outside air sensor falls more than 1’C below this set point.
Outside Frost Set point
– Below this temperature outside the Heating Pump will be asked to run in Frost Mode. Frost
mode ends when the outside air temperature rises 1’C above this set point.
Oper. Hrs
– This is an hours run count of the time that the heating pump has been running. This timer can be reset to
another value if required if for example the pump has been replaced or a service visit made.
Pump Overrun
– When the heating is no longer required or an override has ended the pumps may need to run on to
dissipate residual heat in the boilers. During the overrun the heating valve will open. During overrun the boilers and
signals to them are disabled.
Valve Output
– This is the current position in Auto for the VT Valve Actuator 0% = Closed (recirculation from/to
radiators), 100% = Open (full boiler flow) under normal conditions. The valve is opened for Pump Overrun periods. It
will also undergo an exercise routine every day at midday for 1 minute during periods of non-use.
Manual Override
– Enter any value between 0 and 100 to fix the VT Valve Actuator in that position. When an override
is no longer needed you must delete the override value in order to return the Actuator to Auto.
Valve Time 0-100% - Enter the time in seconds needed for the Valve Actuator to drive the valve from fully closed to
fully open.
Note:
To delete the Valve Override value using the controller wheel and buttons turn the wheel to select the Manual Override
parameter then press the SET button and then select DELETE Value. This will return the valve position to Auto.
To delete the value using the controller basic browser (above) you must enter ---
To delete the value with the Touchscreen or the MO Web Browser as below select the Manual Override Value and the
edit screen will appear. Simply Select DELETE
