How many wires are needed for a communicating control system to control a three-stage heat, two-stage cool heat pump?
A) Four wires—two for power and two for communication
B) Nine wires—one for each stage plus reversing valve and power
C) Five wires—one for each stage heat and cool
D) No wires are required because communicating systems are wireless.
A
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Fill in the blank(s) with the appropriate word(s).
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