McQuay_chiller.pdf

Operating and Maintenance Manual OMM 1130

Group: Chiller

Part Number: OMM 1130

Effective: October 2011

Supercedes: New

Water-Cooled Scroll Compressor Chillers WGZ030DW to WGZ200DW, Packaged Water-Cooled Chiller

WGZ030DA to WGZ200DA, Chiller with Remote Condenser

30 to 200 Tons, 105 to 700 kW

R-410a

50-60 Hertz

Software Version WGZDU0102F

2 OMM 1130

Table of Contents

Introduction General Description Nomenclature Water Pressure Drop Operating Limits Components

Unit Configuration Field Wiring Diagrams Control Panel Layout Motor Protection Module

Start-Up and Shutdown Sequence of Operation

Start-up/Compressor Staging MicroTech II Controller

Controller Software Version General Description Expansion I/O Controller Setpoints Automatic Adjusted Limits Dynamic Defaults

Events & Alarms Unit Stop Alarms Limit Events

Controller Operation EXV Control

Using the Controller Menu Screens Menu Descriptions

BAS Interface Parameter Details

Optional Controls Phase/Voltage Monitor (Optional) Hot Gas Bypass (Optional)

System Maintenance General Electrical Terminals Compressor Lubrication Sightglass and Moisture Indicator Crankcase Heaters Maintenance Schedule

System Service Troubleshooting Chart

Warranty Statement

Products manufactured in an ISO Certified facility

©2011 McQuay International. Illustrations and data cover the McQuay International product at the time of publication and we reserve the right to make changes in design and construction at anytime without notice. ™® The following are trademarks or registered trademarks of their respective companies: BACnet from ASHRAE; LONMARK, LonTalk, LONWORKS, and the

LONMARK logo are managed, granted and used by LONMARK International under a license granted by Echelon Corporation;

Compliant Scroll from Copeland Corporation; Modbus from Schneider Electric;, MicroTech II, Open Choices from McQuay

International.

Cover Picture: WGZ130C with full-paint option

OMM 1130 3

Introduction

General Description McQuay Type WGZ water chillers are designed for indoor installations and are available with water-cooled condensers (Model DW), or arranged for use with remote air-cooled or evaporative condensers (Model DA).

Each water-cooled unit is completely assembled and factory wired before evacuation, charging and testing.

They consist of hermetic scroll compressors, brazed-plate evaporator, water-cooled condenser (WGZ-DW), and complete refrigerant piping.

Units manufactured for use with remote condensers (Models WGZ-DA) have all refrigerant specialties factory-mounted and connection points for refrigerant discharge and liquid lines.

Liquid line components that are included are manual liquid line shutoff valves, charging valves, filter-driers, liquid line solenoid valves, sight glass/moisture indicators, and thermal expansion valves. Other features include compressor crankcase heaters, and a MicroTech II microprocessor controller.

The electrical control center includes all equipment protection and operating controls necessary for dependable automatic operation.

NOTE: This manual contains information on the chiller unit control software operating with various refrigerants as follows:

R-410A, used with the current “D” vintage of the WGZ chiller.

R-134a, used with only with Model TGZ Templifiers. The operating manual devoted exclusively to Templifiers is OMM TGZ-1.

BOOT & BIOS

BOOT Version: 3.0F BIOS Version 3.56

Manuals: Information in unit initial installation and routine maintenance is contained in Installation and Maintenance Manual IM 1131.

Nomenclature W G Z 100 - D W

Water Pressure Drop Water flow rates should be maintained as closely as possible to job design values. The vessel flow rates must fall between the minimum and maximum values shown on the appropriate evaporator and condenser curves.

Measure the water pressure drop through the vessels at field-installed pressure taps and check the flow rate using the following tables. Do not include valves or strainers in these readings.

The evaporator flow rates and pressure drops shown on the following page are for full load design purposes.

The maximum flow rate and pressure drop are based on a 6-degree temperature drop. Avoid higher flow rates with resulting lower temperature drops to prevent potential control problems resulting from very small control bands and limited start up/shut off temperature changes.

The minimum flow and pressure drop is based on a full load evaporator temperature drop of 16-degrees.

Water-Cooled

Global Design

Scroll Compressor Nominal Capacity (Tons)

W = Water-Cooled Cond.

A = Unit Less Cond.

Design Vintage

Warranty Statement