Attributes (VAV Single Duct Minimum Flow Determination) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 16.0

Controller Tool Help

Brand
Johnson Controls
Metasys
Product name
Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
16.0
Revision date
2023-10-02
Language
English

Table 1 describes the attributes used by the VAV Single Duct Minimum Flow Determination modules.

Table 1. VAV Single Duct Minimum Flow Determination Attributes

Name

Type 1

Description

Default Value

CLDWN-MINFLOW (Cooldown Min Flow)

 

Contains the minimum required cooling flow when cooldown.

100 l/s, 200 cfm

CLG-MINFLOW (Cooling Min Flow)

 

The required cooling minimum flow.

Display Units: l/s, cfm

CLGUNOCC-MINFLOW (Unocc Cooling Min Flow)

 

Minimum required cooling flow when unoccupied.

0 l/s, 0 cfm

HTG-MINFLOW (Heating Min Flow)

 

The required heating minimum flow.

Display Units: l/s, cfm

HTGUNOCC-MINFLOW (Unocc Heating Min Flow)

 

Contains the minimum required heating flow when unoccupied.

0 l/s, 0 cfm

Min Flow Reset Type

 

Defines the type of min flow reset strategy. When None is selected, the min flow values are the values at the appropriate inputs. When CO2 is selected, a proportional reset based on a CO2 setpoint and a CO2 proportional band determines the required min flow values. In both cases, the Occupancy Level and Ventilation Requirement can increase the minimum flows.

None

Set Name: None/CO2

MINFLOWCO2-PB (Proportional Band)

 

This parameter specifies the band that the CO2 level must increase above the Setpoint to produce the largest min flow values when the Min Flow Reset Type is other than None.

400 ppm

MINFLOWCO2-SP (Setpoint)

 

Specifies the CO2 level that the process variable must exceed to begin resetting the min flows when the Min Flow Reset Type is other than None.

700 ppm

OA Percent

 

Percent of the supply air that is outdoor air.

20.0%

Occ Cooling Min Flow

 

Minimum required cooling flow when occupied.

100 l/s, 200 cfm

Occ Heating Min Flow

 

Minimum required heating flow when occupied.

100 l/s, 200 cfm

OCC-LEVEL (Occupancy Level)

 

The number of people in the zone

0

Occupancy

 

Current Occupancy status of the unit.

Occupied

Set Name: Occ Effective

Process Variable

 

Contains the measured variable used to reset the minimum airflow when the Min Flow Reset Type is other than None.

0 ppm

Ventilation Requirement

 

Outdoor airflow required per person (Occupancy Level).

10 l/s, 20 cfm

WarmupCooldown

 

Current WarmupCooldown status of the unit.

Normal

Set Name: OST Warmup Cooldown

WU-MINFLOW (Warmup Min Flow)

 

Contains the minimum required heating flow when warmup.

100 l/s, 200 cfm

1 C - Configuration Mode Only, G - Default Element (Generated State, if applicable), SC - Simulation and Commissioning Modes Only, V - Calculated Value (Outputs)