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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 boiler is not full of
water, the Low Water Cutoff indicator light is red. All lights below a 'not satisfied' switch will also be red.
The boiler will operate until all inputs are satisfied (Green)
A spare input is available and is shipped jumpered at the control board in the satisfied condition.
NOTE: The manual reset and additional high limit functions are only active if the boiler has been purchased with the 'high
limit' option. In this case, a pair of switches activated by remote temperature sensing bulbs are provided. These
switches are located behind the main control panel on the left side of the boiler. See Figure 45 on page 117
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.
FT
Inputs
Outputs
S E R V I C E
Page 99
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