CW Sequencer - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 13.1

Controller Tool Help

Brand
Johnson Controls
Metasys
Product name
Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
13.1
Revision date
2019-12-04
Language
English

The CW Sequencer module is designed to determine the best operation of the condenser water system. The module determines whether the Bypass Valve should be modulated or open to the towers, and if the tower fans should be used to control the condenser water temperatures. This sequencer uses the outdoor air temperature and humidity to calculate the outdoor air wetbulb temperature. The outdoor air wetbulb temperature is used to determine the cooling tower’s capability to provide cooling to the condenser water. If the outdoor air humidity is unreliable, the sequencer uses the outdoor air drybulb to determine the cooling tower’s ability to cool the condenser water. If the outdoor air temperature or the condenser water temperature are unreliable, the state output is Sensors Unreliable.

For information on how the FSM determines the state, see FSM (Condenser Water).

You can view and modify the modules in this group’s logic.

Figure 1. Condenser Water Sequencer