Attributes (VAV Dual Duct Variable Flow Endpoint Calculation) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 15.0

Controller Tool Help

Brand
Johnson Controls
Metasys
Product name
Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
15.0
Revision date
2022-11-18
Language
English

Table 1 describes the attributes used by the VAV Dual Duct Variable Flow Endpoint Calculation modules.

Table 1. VAV Dual Duct Variable Flow Endpoint Calculation Attributes

Name

Type 1

Description

Default Value

CD Min Flow

 

Specifies the minimum flow for the cold duct.

0 l/s, 0 cfm

CD OA Percent

 

Percent of the cold duct air that is outdoor air.

20.0%

Cooling Max Flow

 

Contains the constant flow for the dual duct box.

500 l/s, 1000 cfm

EFFCD-MAXFLOW (Eff CD Max Flow)

V

Contains the required cold duct maximum flow.

Display Units: l/s, cfm

EFFCD-MINFLOW (Eff CD Min Flow)

G, V

Contains the required cold duct minimum flow.

Display Units: l/s, cfm

EFFHD-MAXFLOW (Eff HD Max Flow)

V

Contains the required hot duct maximum flow.

Display Units: l/s, cfm

EFFHD-MINFLOW (Eff HD Min Flow)

V

Contains the required hot duct minimum flow.

Display Units: l/s, cfm

HD Min Flow

 

Specifies the minimum flow for the hot duct.

0 l/s, 0 cfm

HD OA Percent

 

Percent of the hot duct air that is outdoor air.

20.0%

Heating Max Flow

 

Specifies the constant flow for the dual duct box.

500 l/s, 1000 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)

 

Specifies the band that the CO2 level must increase above the Setpoint to produce the largest minimum 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 minimum flows when the Min Flow Reset Type is other than None.

700 ppm

OCC-LEVEL (Occupancy Level)

 

Number of people in the zone.

0

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

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