Pump, Motor & Heater Inspection Flashcards
7 cards from real CPI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Pump, Motor & Heater Inspection flashcards as text
What does a pool pump's 'service factor' (SF) indicate on the motor nameplate?
Answer: The percentage above rated load the motor can handle continuously without damage
Service factor is a multiplier indicating how much above rated horsepower the motor can operate continuously; a 1.0 SF motor has no additional capacity.
When inspecting a spa heater, an inspector notes the high-limit switch has tripped. What condition triggers this safety device?
Answer: Water temperature reaching an unsafe high level at the heat exchanger
The high-limit switch trips when water temperature at the heat exchanger reaches a preset unsafe high, shutting down the heater to prevent overheating.
A variable speed pump (VSP) in a pool system offers which primary energy-saving advantage over a single-speed pump?
Answer: Power consumption decreases with the cube of speed reduction, saving significant energy at lower speeds
By the affinity laws, pump power consumption drops with the cube of speed reduction, so running at half speed uses roughly one-eighth the energy.
What is the inspector's concern when a pool heater's flue gases are venting horizontally through a wall rather than vertically through a roof?
Answer: Wind-induced backdrafting can push combustion gases back into the equipment area
Horizontal vent terminations can be susceptible to wind-induced backdrafting, which may push toxic combustion gases back into the pool equipment area.
During inspection, a pump motor's thermal overload protector trips repeatedly during normal operation. What does this most likely indicate?
Answer: The motor is overloaded, overheating, or has insufficient ventilation
Repeated thermal overload tripping indicates the motor is running too hot due to overloading, poor ventilation, failing windings, or excessive ambient temperature.
What minimum clearance is typically required around a gas pool heater for proper combustion air and serviceability?
Answer: Clearances specified on the heater's nameplate and local codes must be maintained
Gas heater manufacturers specify required clearances on the nameplate, and these must be maintained for safe combustion air supply and code compliance.
An inspector finds that a pool pump's shaft seal is leaking. What is the most significant risk if this condition is left unaddressed?
Answer: Water intrusion can damage motor windings, causing motor failure or electrical shock hazard
A leaking shaft seal allows water to migrate into the motor, potentially destroying the windings and creating an electrocution hazard.