Attributes (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 following table describes the attributes used by the Condenser Water Sequencer modules:

Table 1. Condenser Water Sequencer Attributes

Name

Description

Default Value

Bypass Control Status

Indicates the current control status of the bypass valve control. This input typically comes from the bypass valve control module. This provides appropriate timing to prevent cycling between modes.

Normal

Set Name: Control Status

Condenser Water Setpoint

This is the setpoint to which the condenser water is being controlled.

21 °C, 70 °F

Condenser Water Temperature

This is the process variable.

21 °C, 70 °F

Delay

This input is the delay time to wait to enter the tower control state from the bypass valve control state after the bypass valve PID reached 100%.

180 Seconds

OA Humidity

This input is the outdoor air humidity.

50% RH

OA Temperature

Outdoor air temperature.

21 °C, 70 °F

State

Shows current state of this output controller.

Off

Set Name: Condenser Water

See Primary States (CW Sequencer).

Switchover Diff

This is the differential used to prevent cycling as the outdoor air wetbulb floats around the switchover setpoint.

2.5 °C, 5 °F

Switchover Setpoint

This is the setpoint this module uses to determine if the outdoor air wetbulb is too warm to provide control of the condenser water with only the bypass valve. If the OA Humidity is unreliable or not connected, the module uses only the OA Temperature.

21 °C, 70 °F

System Enable

Indicates when the chilled water system is enabled.

True

Tower Control Status

Indicates the current control status of the cooling tower control. This input typically comes from the cooling tower PID control module. This provides appropriate timing to prevent cycling between modes.

Normal

Set Name: Control Status