CPI Pool & Spa Systems Design & Operation 3

Question 1

Which pool heating system type uses a refrigerant cycle to extract heat from outdoor air?

Accepted Answer

Heat pump

Answer

Heat pumps use a compressor and refrigerant to extract ambient heat from the air and transfer it to the pool water, making them highly energy-efficient.

Question 2

What is the primary purpose of an equalizer line connected to the bottom of a skimmer?

Accepted Answer

To allow the pump to draw water from the main drain if the water level drops below the skimmer weir

Answer

The equalizer line prevents the pump from running dry or drawing air if the pool water level falls below the skimmer opening, by providing an alternate suction path from the main drain.

Question 3

A multiport valve set to the 'waste' position routes water:

Accepted Answer

Directly from the pump to waste without passing through the filter

Answer

The waste setting bypasses the filter entirely, sending water from the pump directly to the drain line, useful for lowering water level or vacuuming heavy debris.

Question 4

What type of valve is most appropriate for throttling (fine-tuning) water flow in a pool system?

Accepted Answer

Globe valve

Answer

Globe valves are designed for throttling because their internal disc can be precisely positioned to regulate flow, unlike ball or gate valves which are best for on/off service.

Question 5

What is the recommended maximum water velocity in pool suction piping to prevent cavitation?

Accepted Answer

3 ft/sec

Answer

Suction piping should be sized to keep water velocity at or below approximately 3 ft/sec (some codes allow up to 6 on pressure side) to prevent cavitation and excessive head loss.

(CPI) Certified Pool & Spa Inspector Practice Test

(CPI) Certified Pool & Spa Inspector Practice Test

CPI Pool & Spa Systems Design & Operation 3