Valve Exercise; Pump Exercise; Service Mode; Heating And Hot Water Time Extension - SyxthSense SYX66 Series Commissioning Manual

Note: Option 2 Boiler set point option does use the Boiler Flow Sensor for High Temp purposes. The set point will
be set to 0v when the boiler temperature is in an alarm condition.

6.8 Valve Exercise

The Valve will be driven, aiming for the mid position for 1 minute every inactive day at Midday.

6.9 Pump Exercise

The Heating Pump will be run for 2 minutes at midday during periods of non-use.

6.10 Service Mode

Using the Panel switch in the Override Menu, the Service Option is available. Selecting the Service mode will set in
motion a boiler check feature. Boilers will be set to maximum output and the control system will run on full heat for a
period of 30 minutes. The service mode can be cancelled by setting the Panel Switch to any other mode e.g. Auto.
When Service mode has ended or been cancelled the Boilers may or may not be required in normal use but they will
incur the 5 minute restart delay.

6.11 Heating and Hot Water Time Extension

Both the heating and HWS have dedicated software time extension features. The user can program the 1 to 10 hours
additional heating required and then initiate the time extension period. If this is actioned when the time program is in
an occupied condition then the indicator on the interface or web browser will flash to say that it is waiting. When the
time schedule period ends then the time extend period will commence and the indicator will stay on.
An extend period may be cancelled at any time by setting the override status to reset.
An external button (latching type like SyxthSense LAP5) connected to pin 9 will directly start a time extend period when
the input closes. The controller will show the extension period as active when either the software timer or external
button is pressed. The external timer/input is not interlocked with the time schedule and acts directly.
If both methods are used at the same time then the controller will return to Auto when both methods have expired.

6.12 Summer Winter Time Change and Leap Years

This is fully automated. Leap years are fully accommodated into the Calendar and no user adjustment is required.

6.13 Space Temperature High Limit

The SYX66x controller has a high space temperature limit feature. This uses the day set point setting and adds a
changeable offset to this value, room set point added to the offset is the limit set point. If the room sensor rises above
the limit set point then the heating will be switched to Night mode. Should the space temp then fall by 1'C below the
limit value then the heating will be re-enabled. The controller will record High Limit events so these can be investigated
and reasons can be reviewed. The default offset is 2'C. This means with a day set point of 21'C the High Limit will be
active at 23'C. Changing the High Limit offset to 4'C means that the new limit will be 21'C + 4'C = 25'C. Moving the
day set point will also shift the high limit set point and retain the set offset and end users only need to change one
setting. E.g. Day set point changed to 19, offset = 4, room limit will reduce to 23'C.
SYX66x Commissioning Guide
Page 26 of 61
V1.10.3 300117