Attributes (Fan Determination [Terminal Units]) - 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

The following table describes the attributes used by the Fan Determination modules.

Table 1. Fan Determination Attributes

Name

Type 1

Description

Default Value

Cooling Percent Cmd

 

Contains the value fed back from the cooling output control. It should be set to 0% if no cooling output exists.

0.0%

Damper Percent Cmd

 

Contains the value fed back from the damper output control and must exceed the minimum oa position value by 2% before the fan state output is turned on. It should be set to 0% if no damper output exists.

0.0%

Fan Off Threshold

 

Percent output command required to turn the fan off. This value is compared to the larger of the Cooling Percent Cmd and Heating Percent Cmd.

1.0%

Fan On Threshold

 

Contains the percent output command required to turn the fan on. This value is compared to the larger of the Cooling Percent Cmd and Heating Percent Cmd.

5.0%

FAN-CYCLE (Fan Cycling)

 

Specifies whether the fan cycles during occupied periods. If the parameter is set to Yes, the fan only turns on when there is a call for cooling, heating, or economizer (damper percent cmd). Otherwise, if set to No, the fan operates during all occupied and bypass periods.

No

Set Name: No/Yes

FAN-STATE (State)

G, V

Indicates whether the fan is required to operate.

Set Name: Off/On

Heating Percent Cmd

 

Contains the value fed back from the heating output control. It should be set to 0% if no heating output exists.

0.0%

HTG-PURGETIME (Heating Purge Duration)

 

Specifies that when the heating percent command drops below the fan off threshold value, the fan continues to operate for this period of time.

120.0 Seconds

Minimum OA Position

 

Used to prevent the fan from starting unless the Damper Percent Cmd is above its minimum position by 2%.

0.0%

Occupancy

 

Contains input from the Occupancy Mode Determination module relaying the effective occupancy mode of the application.

Unoccupied

Set Name: Occ Effective

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