Engine_2014 : Electricity - 399/2299
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| As shown in figures "A", "B", "C", and "D" of the illustrated PLC controlled heating system, what input requirements must be met for the circulating pump #1 to be running? |
| A) The space air sensor contacts must be closed and the boiler must be firing. |
| B) The hot water tank sensor contacts must be closed and the boiler must be firing. |
| C) The space air sensor contacts must be closed and the boiler must be idle. |
| D) The hot water tank sensor contacts must be closed and the boiler must be idle. |
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Illustration EL-0099
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