CPI Pump, Motor & Heater Inspection 3

Question 1

What is the primary function of the pump strainer basket located in the pump pot?

Accepted Answer

To prevent large debris from reaching and damaging the impeller

Answer

The pump strainer basket catches leaves and large debris before they reach the impeller, protecting it from damage and clogging.

Question 2

When inspecting a heat pump pool heater, which refrigerant component should an inspector note if visibly iced over during operation in warm weather?

Accepted Answer

Evaporator coil

Answer

An iced evaporator coil on a heat pump during warm weather indicates low refrigerant charge or restricted airflow, both requiring service.

Question 3

A pool pump motor is rated at 1.5 HP THP (Total Horsepower). What does this designation mean for inspection purposes?

Accepted Answer

The nameplate HP includes service factor, so actual continuous HP may be lower

Answer

THP (Total Horsepower) includes the service factor, so the motor's actual continuous-duty HP is less than the stated THP rating.

Question 4

Which condition found during inspection would indicate a pool pump impeller is partially clogged?

Accepted Answer

Pump motor runs but flow rate is significantly lower than expected

Answer

A partially clogged impeller reduces water flow while the motor continues to run, resulting in lower-than-expected flow rates.

Question 5

For a gas pool heater, what is the purpose of the pilot assembly or ignition control module?

Accepted Answer

To ignite the main burner and verify the flame is established

Answer

The pilot assembly or ignition module lights the main burner and uses a flame sensor to confirm ignition before allowing continued gas flow.

(CPI) Certified Pool & Spa Inspector Practice Test