An HVAC project can carry its water side too. With water plant switched on, the project runs the hydronic stations after its air side, and a circuit's terminals can be the project's own air systems, so their coil duties are never typed twice.
Switch on water plant
- 1
When you create the project, tick Chilled or heating hot water plant in the New project dialog.
- 2
For a project that already exists, open Design Conditions, tick Chilled or heating hot water plant under Water plant, and choose Save design conditions.
- 3
The hydronic stations, Circuits, Plant, Pipe Sizing, Pumps and Expansion & Volume, then follow Fans in the project's chain, before Reports.
Serve an air system from a circuit
- 1
Calculate and save the air system on Air Systems first, so it has a saved result to read.
- 2
On Circuits, choose Add a terminal, and set the terminal's Kind to Air system.
- 3
Choose the system under Air system, then choose Cooling for its cooling-coil duty or Heating for its heating load.
- 4
Save the circuit.
An air-system terminal has no load cell: its load is read from the air system as last saved. If the system has no saved result, its result is incomplete, or it carries no duty of the kind chosen, the terminal shows the reason in Terminal flows instead of a load, and the circuit totals cover only the terminals that resolved. After changing an air system, save it on Air Systems before relying on the circuit's figures.
A hydronic project has no air systems, so every terminal on it is a process load entered on Circuits.
Elevation and the report
- On an HVAC project, the Elevation entered on Design Conditions sets the atmospheric pressure that Pumps uses for NPSH and Expansion & Volume uses for the tank. A hydronic project has no Design Conditions station, so both take standard sea-level pressure and say so.
- The project issues one report: the air side, then the water side after it in the same document.