Yazaki AROACE CH-MG150 User Manual

GAS-FIRED DOUBLE-EFFECT
ABSORPTION CHILLER-HEATER
FOR YOUR SAFETY
If you smell gas:
1. Open windows (only if installed
indoors)
2. Don’t touch electrical switches
3. Extinguish any open flame
4. DO NOT SMOKE!
5. Immediately call your gas supplier
FOR YOUR SAFETY
Do not store or use gasoline or
other flammable vapors and
liquids in the vicinity of this or any
other equipment.
CONTENTS
GENERAL Page
 ABSORPTION PRINCIPLE 2
 COOLING OPERATION 3
 HEATING OPERATION 4
CONTROLS
 GENERAL INFORMATION 5
 CONTROL ADJUSTMENTS 8
 CONTROL SEQUENCE 12
OPERATION
 COOLING 13
 PRECAUTIONS 13
 HEATING 13
 REMOTE CONTROL 13
Page
 SAFETY CONTROLS 13
 WINTER SHUTDOWN 14
MAINTENANCE
 GENERAL INFORMATION 14
 MAINTENCE SCHEDULE 14
 ROUTINE MAINTENANCE 15
 EVACUATION OVERVIEW 15
 CHEMICAL MAINTENANCE 17
 WINTERIZING 17
 TROUBLESHOOTING 17
 WATER QUALITY 18
 ERROR CODES 19
OPERATING INSTRUCTIONS
CH-MG150
CH-MG200

Yazaki AROACE CH-MG150 Specifications

General

Brand	Yazaki
Model	AROACE CH-MG150
Category	Gas Heater
Language	English

Summary

General Information and Absorption Principle

The Absorption Principle Explained

Explains Yazaki chiller-heaters use lithium bromide and water, vacuum, and the double-effect cycle.

Cooling Operation Details

High-Temperature Generator (HGE) in Cooling

Explains how the gas burner heats dilute solution in HGE, releasing superheated refrigerant vapor.

Low-Temperature Generator (LGE) in Cooling

Describes superheated refrigerant vapor heating dilute solution in LGE, producing concentrated solution.

Condenser (COND) Function

Explains refrigerant vapor condensation, heat removal by cooling water, and rejection to cooling tower.

Evaporator (EVA) Function

Details refrigerant boiling, heat removal from chilled water, and vacuum maintenance by the absorber.

Absorber (ABS) Function

Explains how concentrated solution cools, absorbs refrigerant vapor, and maintains vacuum in the ABS section.

Heating Operation Details

High-Temperature Generator (HGE) in Heating

Describes heating dilute solution in HGE, releasing vapor to Evaporator, and concentrated solution to Absorber.

Low-Temperature Generator (LGE) in Heating

Explains LGE's role in heating mode where solution flows back to Absorber without significant vapor release.

Evaporator (EVA) in Heating Mode

Details superheated vapor condensing, heat transfer to hot water, and solution dilution in Absorber sump.

Absorber (ABS) in Heating Mode

Explains how condensed refrigerant and circulated solutions meet in Absorber sump, diluting it for cycle restart.

Control System Overview

Control Panel and Remote Operation

Describes the control panel, its location, and remote operation via BAS/BMS.

Solution Pump Control System

Explains the Hitachi VFD controller for the solution pump and its factory settings.

Control Adjustments and Configuration

Control Box Internal Components

Illustrates the opened control box, showing various electrical components and fuse ratings.

Main CPU Board Functionality

Details the Main CPU Board, its ACT5 maintenance checker connection, and setting switches.

ACT5 Maintenance Checker Usage

Explains how to adjust chilled/hot water set points using the ACT5 Maintenance Checker.

I/O Board and Economy Mode

Describes the I/O board and how to enable Economy Mode by closing terminals TB1-75 and TB1-76.

Control Sequence Logic

General Control Sequence Diagram

Illustrates the general control sequence for the chiller-heater, including burner and pump operation logic.

Unit Operation Procedures

Cooling Operation Steps

Step-by-step instructions for initiating cooling operation via the control panel.

Heating Operation Steps

Step-by-step instructions for initiating heating operation via the control panel.

Important Operational Precautions

Lists essential precautions for operating the chiller-heater, including pump/fan settings and water circuits.

Remote Control Activation

Explains how to set the chiller-heater to remote operation using the control panel's REMOTE button.

Safety Controls and Error Code Display

Describes how safety and limit controls monitor conditions and shut down the unit, displaying error codes.

Maintenance Guidelines

General Maintenance Personnel Requirements

Emphasizes that all maintenance must be performed by skilled, experienced personnel.

Scheduled Maintenance Tasks

Outlines a maintenance schedule with tasks recommended every 6 months, 12 months, and 3 years.

Winter Shutdown Procedure

Routine Maintenance Procedures

Evacuation Process Overview

Details the importance of maintaining vacuum, service valve locations, and precautions for evacuation.

General Evacuation Assembly Setup

Explains the setup for general evacuation, including vacuum pump, liquid trap, and vacuum gauge usage.

Chemical Maintenance and Winterizing

Chemical Maintenance and Gas Capturing

Explains chemical balance, inhibitor charge, and capturing gases to check hydrogen byproduct.

Winterizing the Chiller-Heater

Provides instructions for preparing the unit for freezing conditions at the end of the cooling season.

Troubleshooting Common Issues

Chiller-Heater Not Operating Solutions

Lists possible causes and remedies for the chiller-heater failing to operate.

Poor Cooling Capacity Solutions

Lists possible causes and remedies for the chiller-heater exhibiting poor cooling capacity.

Water Quality Specifications

Circulation Water Quality Standards

Details water quality parameters and limits for circulation water in cooling, chilled, and hot water circuits.

Make-up Water Quality Standards

Details water quality parameters and limits for make-up water in cooling, chilled, and hot water circuits.

Error Code Reference Guide

List of Error Codes and Descriptions

Lists error codes, their descriptions, and relevant notes for troubleshooting.