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Operation
Relay #1 enables the boilers to operate if the outdoor air temperature is below the low
setpoint and the schedule is occupied. Each boiler is enabled to operate if the previous
boiler is currently active and has been on for at least 5 minutes. All four boilers monitor
the same analog input sensor for the Water Temperature reading. The #1 Enable Relay
can monitor a global broadcast from another controller on the RS-485 communications
loop for the outdoor air temperature but, in this case, we are reading the Outdoor Air
Temperature on Analog Input #2. Notice on the Analog Output #2 configuration screen
that it was also configured to broadcast on Global Analog Channel #2. That is because
the GPC Plus doesn’t have any other way of knowing that it is the one reading the
outdoor air temperature.
The voltage output is not used so no control source is selected, and no other related
setpoints require modification.
Shown below is a sample Status Screen for this sample application. Notice that the
boilers are not enabled even though the schedule is active because the outdoor air
temperature is too high.