OpenBuildings™ Station Designer Help

HVAC Equipment

Used to place heating and cooling equipment and control units used in HVAC Systems.

Accessed from:


  • Ribbon: Building Design > Mechanical > Mechanical Systems > Equipment


Schema Properties example - HVAC Equipments

Selecting a fitting from the ribbon panel activates the Place Component settings dialog, where you can manage the schema parameters (DG instance properties). Also, the contextual Placement tab appears on the ribbon, that provides placement settings options for the currently selected fitting.

The generic placement settings, along with the unique set of dimensional and data parameters from the datagroup system provide the core workflow used to accurately position mechanical components within a system.

Component categories

VAV boxes are pneumatic valves are zone-level flow control devices. Normally termed as VAV terminal units. It is basically a quality, calibrated air damper with an automatic actuator. The VAV terminal unit is connected to either a local or a central control system. The FPU -Fan Power Unit is sometimes in space constraints used as an auxiliary unit to boost the air flow in place of big AHU. The system's fan capacity is critical control in VAV systems is critical without spending more heat on fan. The over-pressurization demands a proper and rapid flow rate control. VAVs are available in two categories based on their shape type - rectangular and round. The round VAVs are provided with single and double outlets. The FPU on the other hand is available in standard round shape with single outlet.

These devices share many of the common VAV- FPU Properties.

In FCU the coil heating and cooling mechanism can be set electrical or plumbing. A fan coil unit (FCU) on the other hand is a simple device engaged in an HVAC system consisting of a heating or cooling coil and fan . FCUs comprise one quarter of 2-pipe-units and three quarters of 4-pipe-units can be configured horizontal (ceiling mounted) or vertical (floor mounted), and controlled either by a manual on/off switch or by thermostat. Typically an FCU is not connected to ductwork, and is used to control the temperature in the space where it is installed, or serve multiple spaces. Cassette type FCUs are economical to install over ducted or central heating systems with air handling units. These devices share many of the common FCU Properties.

The Cooling tower units do the heat transfer and condense vapor into liquid an essential unit of heat exchangers of HVAC refrigeration systems for air conditioning of buildings. A cooling tower is an equipment used to reduce the temperature of a water stream by extracting heat from water and emitting it to the atmosphere. Cooling towers make use of evaporation whereby some of the water is evaporated into a moving air stream and subsequently discharged into the atmosphere. As a result, the remainder of the water is cooled down significantly. Cooling towers are able to lower the water temperatures more than devices that use only air to reject heat, like the radiator in a car, and are therefore more cost-effective and energy efficient. The Air Handling Equipments share many of the common properties.

Close control units (CCUs) are Precision Air Conditioners (PAC) used for precise control of temperature along with humidity in Server room, Datacenter, Laboratory and various Industrial applications. Equipments share many of the common properties.

Notable Properties

  • Connection End Type – The end conditions of fittings are set to flange, male or female connections with full dimensional control by setting the End Type property. Also, the two ends are independent, and may have different connections. For example, the value fl-2;fe-.13 creates a flange at End1 with size 2, and a female connection at End2 with a clearance of .13.
  • Control Connection Side – Sets one of the sides as location or surface on which the device control box could be located. Other control dimensions set overall size of the control box mounted on the device.
  • Control Box – Sets control box and pipe connections at left or right side on the unit.

The list of equipments in HVAC Equipment group is compiled in the HVAC Equipment types topic.