Attributes (Chiller Forced Upstage) - 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 Chiller Forced Upstage modules:

Table 1. Chiller Forced Upstage Attributes

Name

Type 1

Description

Default Value

Delay

 

This input is the value, in minutes, sent to the On Delay.

20.0 minutes

Derate Now

G

This output is the result of the two comparisons, and is then connected to the Derate Now input on the Chiller Selector.

False

Flow

 

This input is compared to the Max Flow. This input is typically connected to the CHW Supply Flow.

0.0 gpm, 0.0 L/s

Flow Differential

 

This input defines the amount the CHW flow must rise above setpoint to trigger the upstage.

30.0 gpm, 114.0 L/s

Max Flow

 

This input is compared to the Flow input. This value may be a user-defined value or come from another module that calculates the Max Flow based on the number of devices running.

0.0 gpm, 0.0 L/s

Reset

 

Issues a reset command to the derate reset input on the Chiller Selector.

False

Temp

 

This input is compared to the Temp Setpt. This input is typically connected to the CHW Supply Temperature.

0 °C, 0 °F

Temp Differential

 

This input defines the amount the CHW supply temperature must rise above setpoint to trigger the upstage.

1.7 °C, 3 °F

Temp Setpt

 

A constant is added to this input and then compared to the Temp input. This input is typically connected to the CHW Supply Temperature Setpoint.

0 °C, 0 °F

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