InstallationCâu 39 / 110
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
Giải thích
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.
Luyện miễn phí toàn bộ 110 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A package unit differs from a split system in what way?
- Gas piping for a furnace must be sized primarily to do what?
- What is the purpose of a sediment trap (drip leg) installed near a gas appliance?
- Flexible duct connectors at the air handler are commonly used to accomplish what?
- Why should supply and return ducts be sealed with mastic or listed tape at joints?
- When installing a split-system condenser, adequate clearance around the unit is needed mainly to ensure what?
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