As shown in figure "A" and "B" of the...

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Question 1 of 205eccefa4bacbc34ba4d48524

As shown in figure "A" and "B" of the illustration, the potable water pump is short-cycling by the action of the pressure switch as a result of an unusually high level in the potable water hydro- pneumatic header tank. What is most likely the cause? Illustration EL-0043

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🔍 Key Concepts

• Hydro-pneumatic potable water tanks rely on a compressible air cushion above the water to smooth out pressure changes. • When the potable water tank level is unusually high, the amount of trapped air in the tank changes and affects pump cycling. • The pressure switch acts on system pressure, with a set cut-in (start) and cut-out (stop) range and differential, but it does not itself change the air/water volume relationship in the tank.

💭 Think About

• Think about what happens to the size of the air cushion when the tank water level rises higher than normal: does the air volume increase or decrease, and how does that affect pressure changes when the pump starts? • Short-cycling means the pressure is rising and falling very quickly. Which condition inside the hydro-pneumatic tank would cause pressure to change rapidly with only a small change in water volume? • Ask yourself: is the problem more likely in the tank’s air charge or in the pressure switch settings, given that the symptom is tied to an unusually high tank level rather than a recent adjustment to controls?

✅ Before You Answer

• Confirm how a loss of air cushion versus excess air in the tank would influence pump run time and cycling frequency. • Verify that short-cycling is mainly a consequence of insufficient effective storage volume in the tank, and what that implies about the air-to-water ratio. • Before choosing, match each option to the observed condition: "unusually high water level" and "short-cycling" – which choice logically explains both together?

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