Attributes (Fan Determination [VAV Parallel Flow Based]) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 15.0

Controller Tool Help

Product name
Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
15.0
Revision date
2022-11-18

The following table describes the attributes used by the Fan Determination (VAV Parallel Flow Based) module.

Table 1. Fan Determination (VAV Parallel Flow Based) Attributes

Name

Type 1

Description

Default Value

Cooling Percent Cmd

 

Current cooling command.

0.0%

Fan Off Threshold

 

Contains the percent output required to disable the fan. This value is compared to the Cooling Percent Cmd and the Heating Percent Cmd. Both must be less than this to turn the fan off due to heating or cooling requirements.

0.1%

Fan On Threshold

 

Contains the percent output required in order to enable the fan. This value is compared to the Cooling Percent Cmd and the Heating Percent Cmd. If either is greater than this value, the State output is on.

5.0%

FAN-STATE (State)

G, V

Contains the desired Status for the Fan.

Off

Set Name: Off/On

Heating Percent Cmd

 

Current heating command.

0.0%

HTG-PURGETIME (Heating Purge Duration)

 

Specifies that when a call for heating is ended, the fan continues to operate for this period of time. Although this input can accept any value, it is connected to the timer’s duration input. The Timer clamps the duration value at its min value or its max value if the write is outside of this range.

120 Seconds

OCC-MINFLOW (Parallel Fan Min Occ Flow)

 

Contains the occupied flow threshold. For occupied conditions, a supply flow below this value causes the fan to start.

Display Units: l/s, cfm

Occupancy

 

Contains the effective occupancy of the Occupancy Mode Determination.

Unoccupied

Set Name: Occ Effective

Supply Flow

 

Contains the measured Supply Flow.

0.0 l/s, 0.0 cfm

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