Application

Room Functions

Room Coordination Functions for HVAC

Siemens Industry, Inc.

Application Note

A6V11692053

Smart Infrastructure – Building Products

2019-04-01

Air Volume Flow Tracking

The application function Air volume flow tracking (AirFlTck) collaborates with

VAV supply and extract dampers to calculate the extract airflow setpoint.

NOTE:

Air volume flow tracking application function is NOT enabled in any Dual Duct,

VAV or FPB terminal box application templates.

VAV Room Temperature Control for Cooling

VAV room temperature control for cooling (VavTRCtlC) is the basis for the

sequencing of the room temperature PID controllers for VAV cooling. It determines

the room cooling setpoint and the room cooling demand signals to maintain the

room temperature at the cooling setpoint. The following devices are supported:

⚫ Supply air VAV damper

⚫ (Optional) Cooling coil

⚫ (Optional) Chilled ceiling

NOTE:

The VAV application templates have been pre-loaded to support cooling with the

Supply air VAV damper.

If the default application does not meet job requirements, an application can be

configured and modified to job specifications in ABT Site.

This AF works in collaboration with the room segment HVAC device (the VAV

supply air damper) to provide cooling. The cooling room temperature PID controller

is enabled based on a signal that is read via the grouping function (from equipment

in the room segment) indicating whether cooling is available.

Temperature sequence order: 1) Chilled ceiling, 2) Heating/Cooling coil, 3) Cooling

coil, 4) VAV cooling (only for VAV serial fan operation)

VAV Room Temperature Control for Heating

Overview

The application function VAV room temperature control for heating (VavTRCtlH)

is the basis for the sequencing of the room temperature controllers for VAV

heating. It determines the room heating setpoint and the room heating demand

signals to maintain the room temperature at the heating setpoint. The following

devices are supported:

⚫ Supply Air VAV damper

⚫ (Optional) Heating/Cooling coil

⚫ (Optional) Heating/Chilled ceiling

⚫ Heating coil

⚫ (Optional) Radiator