Lochinvar MP2 - Manual (Page 23)

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).
R OTATE / O FF
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).
F IXED L AST / O FF
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.
F IXED L EAD / O FF
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.
F IRST O N / L AST O FF OR F IRST O N / F IRST O FF
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).
O FF / E XERCISE
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.
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FIG. 45
FIG. 46
FIG. 47
FIG. 48
FIG. 49
FIG. 50