Why are both lines of a mini-split system insulated?
A) Because it can connect up to 8 sections B) Because they do not have any ductwork
C) Because the entire unit is outdoors D) Because there is only one metering device
D
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Which is normal flow in a cooling coil?
A) Crossflow, which is water in on the entering air side. B) Counterflow, which is water in on the leaving air side. C) Crossflow, which is water in on the leaving air side. D) Counterflow, which is water in on the entering air side.
The accompanying figure shows an assortment of mechanical symbols. What is the symbol in the middle?
A. Rectangular ceiling diffuser B. Round ceiling diffuser C. Flexible connection D. Transition
Technician A says high-side drivers control the ground side of the circuit. Technician B says high-side drivers may be capable of determining circuit faults. Who is correct?
A. Technician A only B. Technician B only C. Both Technician A and B D. Neither Technician A nor B
What does the furnace board do on most modern furnaces?
A) cycles the indoor blower motor B) controls the ignition, safety, and blower operation C) controls the flames ignition sequence D) monitors furnace safety