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Maintaining condensate return water at a pH of 7-8 is crucial for several reasons. This range is slightly alkaline and helps to prevent corrosion of system components, such as pipes and boilers, which could occur in more acidic conditions. When pH levels drop below 7, the water becomes increasingly corrosive, risking damage to metals and leading to leaks or failure of equipment over time.

Moreover, water with a pH in the neutral to slightly alkaline range helps to avoid issues related to scale formation and biological growth, both of which can arise in improperly managed water systems. A balanced pH also enhances the effectiveness of conditioning agents that might be used to treat the water, ensuring optimal performance of the heating and cooling systems in the building.

In contrast, a perfectly neutral pH (which would be around 7) does not sufficiently account for the needs of certain materials in the system, while a pH of 10-11 could lead to scale formation and other complications. A range of 5-7 is considered acidic and would cause corrosion, similarly leading to operational issues. Thus, maintaining condensate return water within the 7-8 pH range is essential for the longevity and reliability of the plant operations.