An industrial audio briefing outlines the emergency troubleshooting protocol for a commercial reverse osmosis water purification system displaying a critical pressure differential warning (Alert P-12):
"Upon the activation of Alert P-12, the technician must first depress the primary pressure relief valve to vent the secondary chamber before performing any other inspection. Once the system pressure gauge drops below two bars, immediately disconnect the high-pressure pump's auxiliary power connector. Under no circumstances should the internal membrane filters be flushed while the secondary chamber remains pressurized. Following auxiliary power disconnection, allow the entire unit to stabilize undisturbed for three full minutes. Only after this three-minute equalization period has elapsed, and provided that the emergency bypass valve remains completely closed, should you initiate the semi-automatic membrane backwash cycle."
According to the troubleshooting instructions, which of the following outlines the correct sequence of actions required to safely resolve the Alert P-12 condition?
- ADisconnect the auxiliary power connector immediately upon alert activation, wait three minutes for system stabilization, depress the pressure relief valve below two bars, and initiate the backwash cycle with the bypass valve open.
- BDepress the pressure relief valve, initiate the semi-automatic membrane backwash cycle as soon as pressure drops below two bars, and disconnect the auxiliary power connector while the backwash runs.
- Depress the pressure relief valve until pressure drops below two bars, disconnect the auxiliary power connector, wait three minutes for stabilization while keeping the bypass valve closed, and then initiate the membrane backwash cycle.Answer
- DOpen the emergency bypass valve to vent the secondary chamber, keep the auxiliary power connected throughout the three-minute waiting period, and manually flush the internal membrane filters.