iSMA CONTROLLI iSMA-B-FCU User Manual page 91

iSMA-B-FCU Programming User Manual
• One-stage mode: only the Heating Binary Output and Cooling Binary Output slots are
switched on/off,
• Two-stage mode: the Heating Binary Output and Cooling Binary Output slots are used
for the first stage, and dedicated binary outputs (the Heating Second Stage Binary
Output and Cooling Second Stage Binary Output slots) are used for the second stage.
Note: Operation in the two-stage mode can be selected by setting the Heating Second
Stage Enable and/or Cooling Second Stage Enable slots to true. If one of these slots is set
to false, the component will operate in the one-stage mode for corresponding
temperature mode (Heating or Cooling).
For proper operation, the component has to be enabled (the Temperature Binary Enable
slot set to true), and the Fan Active slot has to be set to true. If the second condition is
not met, the component is enabled, but main outputs are blocked–values of the Heating
Binary Output, Cooling Binary Output, Heating Second Stage Binary Output, and Cooling
Second Stage Binary Output slots are set to false.
The conditions for switching on/off heating binary output slots for one-stage mode (the
Heating Binary Output and Cooling Binary Output slots) are presented in the figures
below:
Figure 69. Binary control of temperature for 1st stage only - heating mode
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