User Guide

Appendix

HVAC Room Control

Siemens Desigo TRA User Guide A6V10415564_en_a_21

Building Technologies 2015-06-23

9.1.1 BACnet Priorities for HVAC Applications

The following table illustrates the priorities used in Desigo.

Priorities in HVAC

Priority

Description

Example

1 Emergency mode 1 ‒

2 Emergency mode 2 Life safety (fan cannot be switched due to smoke)

3 Emergency mode 3 ‒

4 Protection mode 1 ‒

5 Protection mode 2 Locking via a dependent object (for example, the

damper must be opened before the fan can be switched

on).

6 Minimum on/off ‒

7 Manual Operating

mode 1

‒

8 Manual Operating

mode 2

Manual mode by system operator or on site

9‒12 Automatic mode 1‒4 ‒

13 Manual Operating

mode 3

 Manual operating in room

 Manual operation by system operator

 Scheduler

14 Automatic mode 5 ‒

15 Automatic mode 6 Automatic by program (for example, temperature

control)

16 Automatic mode 7 ‒