Slant/Fin SC-9 - Manual (Page 14)

14 SPACE HEATING ONLY WITH OUTDOOR RESET
Rotate / Off
The Rotate / Off DIP switch selects whether or not the control is to provide
Equal Run Time Rotation of the boiler stages. If the switch is set to Rotate,
the stages will be rotated accordingly. If the switch is set to Off, the firing
sequence is fixed starting with the lowest stage to the highest stage.
We recommend that it be set to Rotate for most
systems
Fixed Last / Off
The Fixed Last / Off DIP switch selects whether or not the last boiler is to be
included in the rotation sequence. If the DIP switch is set to Fixed Last, the
last boiler is always the last to fire. This DIP switch is only active when the
Rotate/Off DIP switch is set to Rotate.
We recommend that it be set to Off for most
systems.
Fixed Lead / Off
The Fixed Lead / Off DIP switch selects whether or not the first boiler is to
be included in the rotation sequence. If the DIP switch is set to Fixed Lead,
the first boiler is always the first to fire. This DIP switch is only active when
the Rotate/Off Dip switch is set to Rotate.
We recommend that it be set to Off for most
systems. Unusually long breeching from first boiler
to chimney may require that it be set to Fixed Lead.
First On / Last Off or First On / First Off
The First On / Last Off or First On / First Off DIP switch selects whether the
first boiler is the first to stage on and the last to stage off or the first to stage
on and the first to stage off. This DIP switch is only active when the Rotate /
Off DIP switch is set to Rotate and the Fixed Lead / Off DIP switch is set to
Fixed Lead.
We recommend that it be set to First On/First Off for
most systems.
Off / Exercise
The Off / Exercise DIP switch selects whether or not the control is to exer-
cise the primary pump and boiler pumps. If the DIP switch is set to Exercise,
the pumps are operated for 10 seconds after every three days of inactivity.
We recommend that it be set to Exercise for most
systems.