Primary States (Fan Three Speed) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 13.1

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

  • Off: Manual request to turn the fan off (typically made by network or zone sensor input). All three Fan OnOffs are set to Off.

  • Low: Manual request to turn the fan on at the low speed (typically made by network or zone sensor input). Fan OnOff 1 is set to On. The others are set to Off.

  • Medium: Manual request to turn the fan on at the medium speed (typically made by network or zone sensor input). Fan OnOff 2 is set to On. Fan OnOff 1 and 3 is set to Off.

  • High: Manual request to turn the fan on at the high speed (typically made by network or zone sensor input). Fan OnOff 3 is set to On and Fan OnOff 1 and 2 set to Off.

  • Auto-Off: Turn the fan off. All three Fan OnOffs are set to Off.

  • Auto-Low: Turn the fan on at no lower than Low speed. Compare the percent cmd inputs to the thresholds to determine the actual speed.

  • Auto-Medium: Turn the fan on at no lower than Medium speed. Compare the percent cmd inputs to the thresholds to determine the actual speed.

  • Auto-High: Turn the fan on at the high speed. Fan OnOff 3 is set to On and Fan OnOff 1 and 2 set to Off.

Table 1. Fan Three Speed Command Hierarchy

Mode

Speed 2

Speed 3

State

Off

*

*

Off

Low

*

*

Low

Medium

*

*

Medium

High

*

*

High

Auto-Off

*

*

Off

Auto-Low

False

False

Low

True

False

Medium

*

True

High

Auto-Medium

*

False

Medium

True

High

Auto-High

*

*

High