iSMA-B-FCU Quick Start-up
www.ismacontrolli.com
DMP245en | 1st Issue rev. 1 | 04/2022
page 15 of 56
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Note that, when using the second stage heating, the additional second stage heater can
be controlled only by the O4 output, leaving the A1 or TO1 for the first stage. Otherwise,
when using only the first stage heating, the O4 output can be used for digital control of
the first stage heating actuator.
Figure 7. Heating actuators connection
The figure below pictures the connection of cooling actuators:
A1 for analog 0-10 V control while operating in 2-pipe mode;
A2 for analog 0-10 V control while operating in 4-pipe mode;
TO1 for analog PWM or digital ON-OFF control while operating in 2-pipe mode;
TO2 for analog PWM or digital ON-OFF control while operating in 4-pipe mode;
O5 for digital ON-OFF control.
Note that, when using the second stage cooling, the additional second stage cooler can
be controlled only by the O5 output, leaving the A1, A2, TO1, or TO2 for the first stage.
Otherwise, when using only the first stage cooling, the O5 output can be used for digital
control of the first stage cooling actuator.
Figure 8. Cooling actuators connection
For more information on control types and connection details, check the iSMA-B-FCU
Application manual and iSMA-B-FCU Hardware manual.
