Case study: out-of-hours plant runtime review

Problem

A site suspects heating, cooling or ventilation plant is running outside normal occupancy. Energy use appears high, but the cause is not obvious from the front-end graphics.

Checks carried out

• Time schedules and exception days.
• Plant enable logic and optimiser behaviour.
• Manual overrides, locked values and priority levels.
• Room temperatures, outside air temperatures and setpoint bands.
• Trend data for plant status, valve/damper demand and occupancy periods.

Actions

Typical actions include correcting schedule errors, removing forgotten overrides, improving labels, adding useful trends and separating genuine demand from plant left enabled by old strategy assumptions.