NV C-1F Heating And Air Practice Questions - Nevada C-1F Heating, Cooling And Circulating Air Contractor Examination Exam

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Before opening a gas train, replacing a circulating pump, or working on an electrically powered furnace blower, the C-1F mechanic's first safety step is to:

Increase thermostat setpoint so residual heat is used up Bypass the high-limit so the unit cannot cycle during the repair Open a window and leave the unit running so CO is diluted Lock out and tag the electrical disconnect and close the appliance fuel shutoff

Correct Answer:

Lock out and tag the electrical disconnect and close the appliance fuel shutoff

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