In a cooling-only VAV box with a reheat coil, which sequence describes how the system should operate to meet the cooling load while maintaining the zone temperature at the setpoint?

Prepare for the HVAC 403A Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

At the heart of a cooling‑only VAV box with a reheat coil is balancing cooling delivery with the ability to fine‑tune the zone temperature. When cooling is needed, the VAV damper opens to let more cooled supply air into the zone, and the chilled supply air acts to bring the zone temperature down toward the setpoint. The reheat coil is a control tool used to prevent overcooling: if the zone temperature drops too far below the setpoint, the system reduces the damper opening to limit cooling and energizes the reheat coil to warm the air slightly so the zone returns to the desired temperature. This sequence keeps the space comfortable while meeting the cooling load, using the damper to control airflow and the reheat coil to maintain the setpoint when needed.