Identification should include the major components for the following systems:
- Electric—the element, sequencer, limit switch/control
- Heat pump—reversing valve, defrost control
- Hydronics—water or circulating pump, isolation valve, expansion tank, zone valve, pressure-reducing valve
Process/Skill Questions:
- How is electric heat measured?
- What is the function of a reversing valve?
- What are the sequences of the defrost cycle?