Primary States (Unoccupied Sequencing [AHU] v100) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 13.1

Controller Tool Help
Product
Controls > Control Tools > Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
13.1
Revision date
2019-12-04

The module is implemented using a Hybrid Activity with possible states of Not Unoccupied, Unocc Htg/Clg Check, and Unoccupied Off. When the State is Not Unoccupied, the Unocc Status is set to Unocc Cntrl Not Req’d and when the State is Unoccupied Off, the State is set to Satisfied. When the State is Unocc Htg/Clg Check, the Zone Temperature input is monitored to determine whether unoccupied operation is required.

  • Unocc Cooling: Unoccupied sequencing is active and the zone requires cooling.

  • Unocc Heating: Unoccupied sequencing is active and the zone requires heating.

  • Unocc Cntrl Not Req'd: Unit does not require unoccupied sequencing.

  • Satisfied: Unoccupied sequencing is active but zones are all satisfied.

  • Temperature Unreliable: Unoccupied sequencing is active but the zone temperature is not reliable.

Table 1. Unoccupied Sequencing (AHU) v100 Command Hierarchy

Occupancy

Application Mode

Temp Reliable

Off During Unocc

Zone Control

Warmup Cooldown

State

NOT (Unoccupied)

*

*

*

*

*

Not Unoccupied

Unoccupied

Vent

*

*

*

*

Not Unoccupied

NOT (Vent)

*

*

FALSE

Warmup

Not Unoccupied

Cooldown

Not Unoccupied

TRUE

*

Normal

Unoccupied Off

Coast

Unocc Htg/Clg Check

TRUE

FALSE

*

Normal

Unocc Htg/Clg Check

Coast

Unocc Htg/Clg Check

FALSE

FALSE

*

Normal

Temperature Unreliable

Coast

Temperature Unreliable

TRUE

*

TRUE

Warmup

Unocc Htg/Clg Check

Cooldown

Unocc Htg/Clg Check

FALSE

*

TRUE

Warmup

Temperature Unreliable

Cooldown

Temperature Unreliable