Johnson Controls LX Series User Manual

1LX Series Unit Ventilator Controller User’s Guide
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Sensor Configuration Wizard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Control Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
LONMARK Functional Profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Units in LONWORKS Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Language Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Selecting a Measurement System or Selecting a Language . . . . . . . . . . . . . . . . . . . . . 16
Unit Ventilator Controller Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
10k Ohm or Digital Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Analog Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4 to 20 mA Analog Input, Externally Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Sensors and Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Auxiliary Alarm Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Bypass Contact Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
CO
2
Level Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Discharge Temperature Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Economizer Enable Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Emergency Contact Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Fan Speed Selector Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Fan State Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Mixed Air Temperature Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Mode Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Occupancy Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Outdoor Enthalpy Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
LX Series Unit Ventilator Controller
User’s Guide
Code No. LIT-12011486
Issued June 22, 2009

Johnson Controls LX Series Specifications

General

Brand	Johnson Controls
Model	LX Series
Category	Air Conditioner
Language	English

Summary

Introduction

LONMARK Functional Profile

Describes the controller's compliance with LONMARK standards and its network capabilities.

Units in LONWORKS Networks

Compares Imperial and SI units and discusses their impact on LONWORKS network data.

Language Selection

Provides instructions for changing the controller's language and regional display settings.

Controller Inputs

10k Ohm or Digital Input

Details configuring universal inputs for 10k ohm resistance or digital switch signals.

Analog Inputs

Explains the setup for analog inputs, including 4-20mA and 0-10VDC signals.

Sensors and Switches

Lists and describes various sensors and switches connectable to the controller.

Controller Outputs

Analog Output

Describes the configuration and characteristics of the controller's analog outputs.

Digital Outputs

Explains the function and capability of the controller's digital outputs.

Staged Outputs

Details how heating and cooling outputs are sequenced and staged for operation.

Operating Modes

Mode Selection

Explains how to select different operating modes like Auto, Heat, Cool, Fan Only, and Off.

Occupied Mode

Defines the settings and conditions for the controller's occupied mode of operation.

Unoccupied Mode

Describes the controller's behavior and settings for unoccupied periods.

Standby Mode

Details the standby mode, used for intermittently occupied areas like meeting rooms.

Control Calculations

Calculating the Space Temperature Setpoint

Explains how space temperature setpoints are determined and calculated by the controller.

The Effect of nviSetPoint on the Active Setpoints

Describes how the nviSetPoint variable modifies active setpoints in standby or occupied modes.

Ventilation and Air Quality

Control of the Fresh Air Intake

Details methods for controlling fresh air intake, including DCV and damper modulation.

Humidity Control

Explains how the controller manages space humidity using various outputs and PID loops.

Cooling Operations

Free Cooling

Describes strategies for using free cooling based on outdoor conditions and economizer status.

Mechanical Cooling

Outlines the conditions and sequence for activating mechanical cooling.

Heating Operations

Night Purge

Explains the function of night purge for building air freshening before occupancy.

Morning Warm-up State

Details the morning warm-up process to prepare the space for occupancy.

Advanced Controller Functions

Optimum Start

Describes how Optimum Start predicts and achieves desired space conditions before occupancy.

Emergency Operation

Covers emergency modes like Purge and Shutdown for safety and contaminant control.

The PID Loop

Explains Proportional, Integral, and Derivative control principles used in the controller.

Alarm Management

Alarm Operation

Details how the controller monitors and reports system alarms and conditions.

Alarm Features

Describes features like alarm state, offset, and delay for deviation and limit alarms.

Disconnect Alarms

Covers alarms generated when sensors are disconnected or experience electrical faults.

Configuration Procedures

Setting up the Unit Ventilator Controller

Provides step-by-step instructions for configuring the controller using the wizard.

Input Configuration

Explains how to set up sensor signal types and network transmissions for inputs.

Output Configuration

Details defining output functions, override values, and signal types for actuators.

PID Configuration

Guides users through setting PID loop parameters for precise control.

General Settings Configuration

Covers essential settings like fresh air, bypass time, and CO2 limits.

Network Variables

Network Input Configuration

Describes parameters for configuring network inputs, including heartbeat and persistence.

Network Output Configuration

Explains settings for controlling network traffic and transmission frequency for outputs.

Standard Network Variable Types (SNVTs)

Provides definitions for common SNVT types used in HVAC applications.