Carrier CRECOMZR052A00 User Manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480314-01 Printed in U.S.A. Form IIK-CRECOMZR52-02 Pg 1 8-21 Replaces: IIK-CRECOMZR52-01
Installation Instructions
Part No. CRECOMZR052A00 and CRECOMZR053A00
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
PACKAGE USAGE AND CONTENTS . . . . . . . . . . . . . 2
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
ACCESSORIES LIST . . . . . . . . . . . . . . . . . . . . . . . . . . 4
VERTICAL INSTALLATION . . . . . . . . . . . . . . . . . . . . . 4
HORIZO
NTAL INSTALLATION . . . . . . . . . . . . . . . . . . 8
Barometric Hood Assembly . . . . . . . . . . . . . . . . . . . 12
• BAROMETRIC HOOD (VERTICAL CONFIGURATION)
• BAROMETRIC HOOD (HORIZONTAL
CONFIGURATION)
CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
EconoMi$er IV Standard Sensors . . . . . . . . . . . . . . 16
• OUTDOOR AIR TEMPERATURE (OAT) SENSOR
• SUPPLY AIR TEMPERATURE (SAT) SENSOR
• LOW TEMPERATURE COMPRESSOR LOCKOUT
SWITCH
• ECONOMI$ER IV CONTROL MODES
• OUTDOOR DRY BULB CHANGEOVER
• OUTDOOR ENTHALPY CHANGEOVER
• DIFFERENTIAL ENTHALPY CONTROL
• INDOOR AIR QUALITY (IAQ) SENSOR INPUT
• EXHAUST SET POINT ADJUSTMENT
• MINIMUM POSITION CONTROL
• DAMPER MOVEMENT
• THERMOSTATS
• OCCUPANCY CONTROL
• DEMAND CONTROLLED VENTILATION
• CO2 SENSOR CONFIGURATION
• DEHUMIDIFICATION OF FRESH AIR WITH DCV
CONTROL
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . 22
TRO
UBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 22
EconoMi$er IV System Preparation . . . . . . . . . . . . . 22
Differential Enthalpy . . . . . . . . . . . . . . . . . . . . . . . . . 22
Single Enthalpy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
DCV (Demand Controlled Ventilation) and Power
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
DCV Minimum and Maximum Position . . . . . . . . . . 23
Supply-Air Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
EconoMi$er IV Troubleshooting Completion . . . . . 23
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified service personnel should install, repair, or
service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of
cleaning coils and filters and replacing filters. All other operations
should be performed by trained service personnel. When working
on air-conditioning equipment, observe precautions in the
literature, tags and labels attached to the unit, and other safety
precautions that may apply.
Follow all safety codes, including ANSI (American National
Standards Institute) Z223.1. Wear safety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire
extinguisher available for all brazing operations.
It is important to recognize safety information. This is the safety-
alert symbol . When you see this symbol on the unit and in
instructions or manuals, be alert to the potential for personal
injury.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is used
to identify unsafe practices, which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operation.
IMPORTANT: Read these instructions completely before
attempting to install the EconoMi$er
®
IV accessory.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
and/or death.
Before beginning any modification, be certain that the main-
line electrical disconnect switch is in the OFF position. Close
the main gas supply shutoff valve. Tag disconnect switch and
gas valve with suitable warning labels.
WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or
death.
Disconnect power supply and install lockout tag before at-
tempting to install accessory.
Vertical and Horizontal Low Leak EconoMi$er
®
IV Accessory
for Medium Rooftop Units
15 to 27.5 Tons

Carrier CRECOMZR052A00 Specifications

General

Brand	Carrier
Model	CRECOMZR052A00
Category	Air Conditioner
Language	English

Summary

Safety Considerations

General Safety Precautions

Covers installation and servicing safety, codes, and personal protective equipment.

Understanding Safety Signal Words

Explains the meaning of DANGER, WARNING, CAUTION, and NOTE.

Electrical Shock Hazard Warning

Specific warning about the risks of electrical shock during installation.

Electrical Operation Hazard Warning

Specific warning regarding electrical hazards during operation.

General Information

System Overview and Functionality

Describes the EconoMi$er IV system's role in free cooling and mechanical cooling.

Key Components and Features

Highlights standard sensors, relief dampers, and optional accessories.

Vertical Installation

Unit Preparation and Panel Removal

Steps for powering off, lockout, and removing unit panels before installation.

Economizer Unit Mounting and Securing

Instructions for physically mounting the economizer unit and securing it.

Component Installation (Sensors, Panels, Hood)

Covers installation of SAT sensor, access panels, and hood assembly components.

Controller Settings and Finalization

Guidance on adjusting controller settings and installing hood screens.

Horizontal Installation

Unit Preparation and Panel Removal

Steps for powering off, lockout, and removing unit panels for horizontal install.

Economizer Unit Mounting and Securing

Instructions for mounting the economizer and connecting the wiring harness.

Component Installation (Sensors, Panels, Hood)

Covers SAT sensor, access panels, and hood assembly for horizontal install.

Controller Settings and Finalization

Guidance on adjusting controller settings and relief damper for horizontal install.

Barometric Hood Assembly

Vertical Configuration Installation Steps

Detailed steps for assembling the barometric hood in a vertical configuration.

Horizontal Configuration Installation Steps

Detailed steps for assembling the barometric hood in a horizontal configuration.

EconoMi$er IV Standard Sensors

Outdoor Air Temperature (OAT) Sensor

Measures outdoor air temperature to enable free cooling control.

Supply Air Temperature (SAT) Sensor

Measures supply air temperature for system optimization and control.

Low Temperature Compressor Lockout Switch

Prevents compressor operation when outdoor ambient temperature is too low.

Economiser IV Control Modes

Outdoor Dry Bulb Changeover

Controls free cooling based on outdoor air dry bulb temperature.

Outdoor Enthalpy Changeover

Controls free cooling using outdoor air enthalpy comparisons.

Differential Enthalpy Control

Compares outdoor and return air enthalpy for optimal free cooling selection.

Control System Inputs and Settings

Indoor Air Quality (IAQ) Sensor Input

Enables demand control ventilation based on measured CO2 levels.

Exhaust Set Point Adjustment

Configures exhaust fan operation based on damper position.

Minimum Position Control

Sets the minimum outdoor air damper position for ventilation.

Damper Movement and Thermostat Compatibility

Describes damper speed and how the system interfaces with thermostats.

Advanced Control Strategies

Occupancy Control

Manages system operation based on building occupied or unoccupied status.

Demand Controlled Ventilation (DCV)

Adjusts fresh air intake based on indoor CO2 levels for optimal air quality.

CO2 Sensor Configuration

Details the setup and configuration options for the CO2 sensor.

Operation and Troubleshooting

Sequence of Operation

Explains how the system controls compressors and dampers for cooling.

System Preparation for Troubleshooting

Steps to prepare the EconoMi$er IV controller for diagnostic testing.

Troubleshooting Specific Control Modes

Procedures to check Differential Enthalpy, Single Enthalpy, and DCV.

DCV and Supply-Air Input Checks

Verifies the functionality of DCV and supply-air sensor inputs.

Troubleshooting Completion

Instructions for returning the system to its normal operating configuration.