LAARS Heating Systems
Page 90
S E RV I C E
8.E.2 Digital I/O ( Input / Output )
There are two screens associated with the Digital I/O: Digital I/O Screen-Inputs; Digital I/O Screen-Outputs.
Navigate to the Digital I/O Screen by touching the
Digital I/O
Button on the Service Screen.
Digital I/O Inputs: The indicator light associated with the input is green when the input is satisfied. For example,
if there is adequate flow, the flow switch is satisfied, and the flow switch digital input indicator light is green. The
indicator light associated with the input is red, when the input is not satisfied. For example, if the blower is off, the air
proving switch is not satisfied and the air proving switch digital input indicator light is red. A spare input is available
and is shipped jumpered at the control board in the satisfied condition.
Digital I/O Outputs: The output is on, the indicator light associated with that output is green. For example, if the boiler
pump is running, the boiler pump output indicator light is green. If the output is off, the indicator light associated with
that output is red. For example, if there is no call for heat, the gas valves are off, and the gas valve indicator lights are
red.
Inputs
Outputs
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