A saved or published system can be placed into another design as one block, wired at its open ports, and solved as part of the whole: a chiller nested inside a plant, an air handler nested inside a campus. The composition addresses a nested port as `unit/coil`, three levels deep at most, and the solver flattens the whole tree before solving so nothing is silently ignored — a composition with an unresolved reference is refused, never solved around.

A reference follows its source — edit the saved chiller and the plant that nests it changes — until it is copied in, at which point it is the design's own; it can also be exploded into plain components with the block's name kept as a prefix. A supplier publishes a composition flattened, and another supplier's offering may be nested only where its owner has allowed reuse.

Open the builder — the examples under ＋ Open include a machine of this kind, and a building tab runs it against a year of weather.

Other terms

DOAS — dedicated outside-air system · SZVAV — single-zone variable air volume · VAV terminal box · Economiser · Waterside economiser · Demand-controlled ventilation · Face-and-bypass · Head-pressure control · Humidity ceiling and floor · Cycling and modulation · Coupling · Priority · Category · Design point and TMY year · Superheat · Subcooling · Sensible heat ratio (SHR) · Bypass factor · Wet-bulb temperature · Dew point · COP and EER · Compressor map · Evaporating and condensing temperature · Range and approach · Heat-recovery (three-pipe) VRF · Typical meteorological year (TMY)