Johnson Controls System 450 Series Technical Bulletin

Contents
Contents
Introduction.................................................................................................................................................... 5
Condensing unit control system overview.................................................................................................. 5
Condensing unit control module UI.................................................................................................. 6
Module assembly and outputs........................................................................................................ 12
C450CCU temperature sensors........................................................................................................ 12
System 450 sensors and sensor types for C450CCU............................................................................ 13
Condensing unit control system sensors and switches...................................................................... 13
Defrost termination using a binary switch........................................................................................... 14
Relay outputs............................................................................................................................................ 14
Relay Staging Delay........................................................................................................................... 16
Expansion module fail safe feature................................................................................................ 16
Sensor failure mode.......................................................................................................................... 16
Condensing unit control system example...................................................................................... 17
Control system example......................................................................................................................... 17
Assembling System 450 modules............................................................................................................... 18
System 450 module mounting................................................................................................................... 18
Mounting modules on DIN rail................................................................................................................... 19
Direct-mounting modules........................................................................................................................... 19
Wiring............................................................................................................................................................ 19
Setting up a condensing unit control system........................................................................................... 24
User settings and parameters......................................................................................................... 24
Determining output numbers and output types........................................................................... 27
Condensing unit control module UI navigation guidelines......................................................... 27
Accessing and navigating the UI..................................................................................................... 28
Sensor and output status screens................................................................................................... 28
Accessing the system set up and menu screens........................................................................... 28
Setting up the sensor setup screens.............................................................................................. 29
Setting up the mode setup screens................................................................................................ 30
Setting up the refrigeration setup screens.................................................................................... 30
Setting up the defrost setup screens.............................................................................................. 30
Setting up the off mode fan setup screens.................................................................................... 31
Setting up the time setup screens.................................................................................................. 31
Setting up the backlight screens..................................................................................................... 31
Setting up the sensors and transducers........................................................................................ 31
Setting up the sensor type and offsets........................................................................................... 32
Supported alarms........................................................................................................................................ 33
Typical C450CCU applications..................................................................................................................... 34
Application 1: Controlling the temperature of a walk-in freezer................................................. 34
Application 2: Controlling the temperature of a walk-in cooler.................................................. 35
Application 3: Controlling the temperature of a walk-in cooler.................................................. 36
System 450 Series C450CCU Condensing Unit Control System Technical Bulletin 3

Johnson Controls System 450 Series Specifications

General

Brand	Johnson Controls
Model	System 450 Series
Category	Control Unit
Language	English