Engine_2014 : Motor Plants and Auxiliary Boilers - 1826/2614
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| Before any work is to be carried out on a burner in an automatically fired auxiliary boiler, you should always __________. |
| A) block all control system relays closed |
| B) allow the boiler to cool completely |
| C) close all manually operated fuel valves |
| D) lock all safety interlock switches closed |
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