A cooling-tower water treatment program that allows too few cycles of concentration in hard water, without blowdown control, can lead most directly to which two coupled problems in condenser/ tower loops (conceptual)?

Choices

• (A) Higher reheat in AHU in all weather
• (B) Diesel exhaust in duct
• (C) Blower door fail
• (D) Scale+biofilm+Legionella risk (aerosol drift) in poorly controlled chemistry and drift+ASHRAE 188+local