Hierarchy

All database elements are owned by other elements, therefore elements must be created in a strict order.

The following database elements are common to all the Design disciplines:

• World

• Site

• Zone

HVAC Specific Hierarchy

Below the ZONE level in the HVAC module, the HVAC specific elements are:

• HVAC (HVAC)

• BRANCH (BRAN)

• HVAC Component(s)

• SPOOLS (HSLIST)

• HVAC Spool

HVAC (HVAC) Element

The HVAC (HVAC) is a top level element in the Design database under which Branch (BRAN) and Spools (HLIST) are created.

BRANCH (BRAN) Element

The Branch (BRAN) is a sequence of HVAC component elements running between two points:

• Branch Head

• Branch Tail

HVAC Component Element

HVAC Components are single pieces of HVAC used to create a HVAC design. Refer to HVAC Components for a full description.

HVAC Subcomponent Element

Subcomponents are items owned by a HVAC component. For example, an access panel may be owned by a straight.

SPOOLS (HLIST) Element

The Spools (HLIST) contains a collection of HVAC Spool elements.

HVAC Spool Element

Each HVAC Spool is a sequence of HVAC components combined together, for ease of fabrication.