Installation第 39 / 110 题
Before a new furnace's electrical connections are energized, the technician should verify what first?
a.The condensate is flowing
b.Correct voltage, polarity, and secure grounding per the wiring diagram
c.The refrigerant subcooling
d.The duct insulation R-value
解析
Verifying supply voltage, proper polarity, and a secure ground before energizing protects the equipment controls and the technician. Loose or reversed connections can damage the board or create a shock hazard. The unit's wiring diagram and nameplate provide the required values.
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