The Alarm / C.A. DIP switch selects whether a combustion air damper or alarm device is to be connected to the C.A. / Alarm terminals (12 and 13) (FIG. 45).
ROTATE / OFF |
FIG. 45 |
The Rotate / Off DIP switch selects whether or not the con- trol is to provide Equal Run Time Rotation of the boiler stages. If the switch is set to Rotate, the stages will be rotat- ed accordingly. If the switch is set to Off, the firing sequence is fixed starting with the lowest stage to the highest stage (FIG. 46).
FIXED LAST / OFF |
FIG. 46 |
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 (FIG. 47). This DIP switch is only active when the Rotate / Off DIP switch is set to Rotate.
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 (FIG. 48). This DIP switch is only active when the Rotate / Off DIP switch is set to Rotate.
FIRST ON / LAST OFF OR FIRST ON / FIRST OFF
FIG. 48
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 (FIG. 49).
OFF / EXERCISE
FIG. 49
The Off / Exercise DIP switch selects whether or not the control is to exercise the primary pump and boiler pumps (FIG. 50). If the DIP switch is set to Exercise, the pumps are operated for 10 seconds after every three days of inactivity.
FIG. 47
FIG. 50 |
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