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McQuay AGS 120CS/H User Manual

McQuay AGS 120CS/H
88 pages
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Installation and Maintenance Manual
IMM AGS-2
Group: Chiller
Part Number: 331373301
Date: July 2008
Supersedes: March 2008
Air-Cooled Screw Compressor Chiller
AGS 120CS/H - AGS 210CS/H, Packaged
AGS 120CM/B – AHS 210CM/B, Remote Evaporator
60 Hertz, R-134a
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McQuay AGS 120CS/H Specifications

General IconGeneral
BrandMcQuay
ModelAGS 120CS/H
CategoryChiller
LanguageEnglish

Summary

Introduction

General Description

Provides an overview of the chiller's design, features, and components.

Nomenclature

Explains the unit's model designation system.

Inspection

Details how to check the unit upon receipt for damage and completeness.

Installation and Start-up

Handling

Provides instructions for safely moving and lifting the unit.

Location

Guidelines for unit placement to ensure proper airflow and performance.

Service Access

Describes accessibility to components and control panels for maintenance.

Clearance Requirements

Restricted Airflow

General

Explains how AGS chillers mitigate airflow restriction issues.

Building or Wall on One Side

Discusses performance impacts and adjustments for units near walls.

Two Units Side By Side

Details performance adjustments for units installed close to each other.

Three or More Units Side By Side

Explains adjustment factors for multiple units installed adjacent to each other.

Open Screening Walls

Addresses performance adjustments for units screened by walls.

Pit/Solid Wall Installation

Discusses performance issues and adjustments for units in pits or near walls.

Vibration Isolators

Isolator bolting

Describes methods for securing the unit base to isolators.

Chilled Water Pump

Water Piping

System Water Volume

Explains the importance of adequate water volume for system performance.

Variable Speed Pumping

Discusses design considerations for systems using variable water flow.

Evaporator Freeze Protection

Operating Limits

Maximum Operating Ambient Temperatures

Specifies ambient temperature limits for units based on efficiency.

High Ambient Option

Describes the factory option for high ambient operation.

Flow Switch

Refrigerant Charge

Glycol Solutions

Water Flow and Pressure Drop

Physical Data, Standard Efficiency

Physical Data, High Efficiency

Dimensional Data

Electrical Data

Field Wiring

General guidelines for wiring installation and compliance.

General

Details wiring requirements for power connections and circuits.

Field Wiring Diagram

Electrical Data Notes

Power Limitations

Details acceptable voltage and unbalance limits.

BAS Interface

Lists available Building Automation System interfaces.

Remote Operator Interface Panel

Mentions the availability of a remote interface panel.

Remote Evaporator

Piping Layout

Illustrates the refrigerant piping schematic for a remote evaporator circuit.

Field Wiring (Remote Evaporator)

Details wiring connections for remote evaporator sensors and EXV.

Kit Components

Lists components included in the field installation kit.

Refrigerant Line Sizing

Provides guidelines for sizing refrigerant piping according to ASHRAE.

Dimensions, Unit with Remote Evaporator

Evaporators

Lifting and Mounting Dimensions and Weights, Remote Evaporator

Vibration Isolators, Remote Evaporator

Physical Data, Standard Efficiency

Physical Data, High Efficiency

Solid State Starters

Operating Messages

Lists and describes status messages displayed by the starter.

Starter Planned Maintenance

Outlines maintenance tasks for solid state starters.

Solid State Starter Settings

Component Location

Major Component Location

Identifies the location of key components within the unit.

Power Panel

Control Panel

System Maintenance

General

Describes routine service checks for system components.

Compressor Maintenance

Details required maintenance for semi-hermetic compressors.

Lubrication

States that no routine lubrication is required for AGS units.

Lead-Lag

Describes the feature that alternates compressor starting sequence.

Preventative Maintenance Schedule

Warranty Statement

Limited Warranty

Refers to McQuay's product warranty.

Service

Liquid Line Filter-Driers

Explains when and how to replace filter-drier cores.

Compressor Slide Valves

Describes the operation of compressor slide valves.

Electronic Expansion Valve (EXV)

Explains the function and operation of the EXV.

Evaporator

Charging Refrigerant

Provides guidance on field charging refrigerant.

Standard Controls

Thermistor sensors

Describes the function and location of various temperature sensors.

High condenser pressure control

Explains the system for controlling high condenser pressure.

Mechanical high pressure equipment protection control

Details the high pressure switch function.

Compressor motor protection

Describes overload and Guardister circuit protection.

Head pressure control (standard)

Explains standard fan cycling for head pressure control.

Head pressure control (optional low ambient)

Describes VFD control for low ambient head pressure.

Compressor short cycling protection

Explains anti-cycle timers to prevent rapid compressor restarts.

Controls, Settings and Functions

Troubleshooting Chart

Periodic Maintenance Log

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