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Daikin WGZ200DW - User Manual

Daikin WGZ200DW
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Installation, Operation,
and Maintenance Manual
Water-Cooled Scroll Compressor Chillers
WGZ030DW - WGZ200DW, Packaged Water-Cooled Chillers
WGZ030DA - WGZ200DA, Remote Condenser Chillers
30 - 200 Tons (105 - 700 kW)
R-410A
50/60 Hz
IOM 1322
Group: Chiller
Part Number: IOM1322
Date: June 2021

Table of Contents

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Questions and Answers

  • M
    Michael BridgesSep 10, 2025
    How to fix low suction pressure on Daikin Chiller?
    • J
      Jenna HillSep 10, 2025
      Low suction pressure in your Daikin Chiller can stem from several issues: * Lack of refrigerant; check for leaks, repair them, and add refrigerant. * A dirty evaporator; clean it chemically. * A clogged liquid line filter-drier; replace the cartridge(s). * Clogged suction line or compressor suction gas strainers; clean the strainers. * A malfunctioning expansion valve; check and reset for proper superheat, replace if necessary. * Condensing temperature too low; check the means for regulating condensing temperature. * Compressor will not unload; see corrective steps for failure of compressor to unload. * Insufficient water flow; adjust the flow.
  • E
    Emma PerryAug 23, 2025
    Why is the discharge pressure high in my Daikin Chiller?
    • L
      Lisa WilliamsAug 23, 2025
      High discharge pressure in your Daikin Chiller can be caused by insufficient condenser water or excessively high temperature (readjust temperature control or water regulating valve, increase water supply), fouled condenser tubes or dirty surfaces (clean them), noncondensables in the system (purge them), system overcharge with refrigerant (remove excess refrigerant), a partially closed discharge shutoff valve (open the valve), an undersized condenser (check rating tables), or high ambient conditions (check rating tables).
  • C
    Christine TaylorAug 25, 2025
    What causes low suction pressure in my Daikin Chiller?
    • C
      Caleb JacksonAug 25, 2025
      Low suction pressure in your Daikin Chiller can be caused by a lack of refrigerant (check for leaks, repair and add charge), a dirty evaporator (clean chemically), a clogged liquid line filter-drier (replace cartridge), clogged suction line or compressor suction gas strainers (clean strainers), a malfunctioning expansion valve (check and reset), a condensing temperature that is too low (check regulation), the compressor not unloading (see corrective steps for failure of compressor to unload), or insufficient water flow (adjust flow).
  • K
    kingmartinAug 26, 2025
    Why is the discharge pressure low in my Daikin Chiller?
    • R
      Rhonda MaloneAug 27, 2025
      Low discharge pressure in your Daikin Chiller can be due to faulty condenser temperature regulation (check condenser control operation), insufficient refrigerant in the system (check for leaks, repair and add charge), low suction pressure (see corrective steps for low suction pressure), a condenser that is too large (check condenser rating table), or low ambient conditions (check condenser rating tables).
  • D
    Dylan MossAug 27, 2025
    What causes high suction pressure in my Daikin Chiller?
    • S
      Scott DominguezAug 27, 2025
      High suction pressure in your Daikin Chiller can be caused by an excessive load (reduce load or add additional equipment) or an expansion valve overfeeding (check remote bulb, regulate superheat).
  • P
    Patrick LawrenceAug 29, 2025
    What to do if the compressor of my Daikin Chiller will not run?
    • D
      Danielle HarrisonAug 29, 2025
      If the compressor of your Daikin Chiller will not run, possible causes include an open main switch or circuit breakers (close the switch), a blown fuse (check circuits and motor winding, correct any faults, and replace the fuse), tripped thermal overloads (check the unit closely when it restarts), a defective contactor or coil (repair or replace), or a system shutdown by protection devices (determine the cause and correct it before resetting). It might also be due to no cooling being required (wait until cooling is needed), a liquid line solenoid that won't open (repair or replace the coil), motor electrical issues (check the motor), or loose wiring (check and tighten connections).
  • D
    David HamiltonSep 18, 2025
    What causes Daikin Chiller compressor to lose oil?
    • J
      Joy AvilaSep 18, 2025
      A Daikin Chiller compressor can lose oil due to: * Lack of refrigerant; check for leaks and repair. Add refrigerant. * Velocity in risers too low (A-C only); check riser sizes. * Oil trapped in line; check pitch of lines and refrigerant velocities.
  • D
    Daniel JensenSep 22, 2025
    Why is my Daikin WGZ200DW Chiller compressor thermal switch open?
    • Z
      Zachary WernerSep 22, 2025
      The Daikin Chiller compressor thermal switch might be open because: * The system is operating beyond design conditions; add facilities so that conditions are within allowable limits. * The discharge valve is partially shut; open the valve.
  • S
    Stacey CooperSep 8, 2025
    What causes high discharge pressure in Daikin WGZ200DW?
    • K
      Kelli BanksSep 9, 2025
      High discharge pressure in your Daikin Chiller can be caused by: * Insufficient condenser water or water temperature being too high; readjust the temperature control or water regulating valve and investigate ways to increase water supply. * Fouled condenser tubes (water-cooled condenser), clogged spray nozzles (evaporative condenser), or a dirty tube and fin surface (air cooled condenser); clean the affected components. * Noncondensables in the system; have the noncondensables purged. * System overcharge with refrigerant; remove excess refrigerant. * Discharge shutoff valve partially closed; open the valve. * Condenser undersized (air-cooled); check condenser rating tables against the operation. * High ambient conditions; check condenser rating tables against the operation.
  • M
    Melinda MullinsSep 4, 2025
    Why does the freeze protection open on my Daikin Chiller?
    • D
      David PerezSep 4, 2025
      The freeze protection in your Daikin Chiller opens because the thermostat is set too low (reset to 42°F (6°C) or above), there is low water flow (adjust flow), or there is low suction pressure (see “Low Suction Pressure”).

Summary

Introduction and Installation

Hazard Identification Information

Critical safety warnings and hazard symbols explained.

Chiller Nomenclature

General Description

Overview of Daikin Applied WGZ water chillers and their features.

Inspection

Procedures for checking equipment upon receipt for damage or completeness.

Installation

Location

Guidelines for placing the chiller in an appropriate indoor or weather-protected area.

Space Requirements for Connections and Servicing

Recommended clearances for piping, servicing, and access to unit components.

Moving the Unit

Safe procedures for handling, lifting, and positioning the chiller unit.

Water Piping

Chilled Water Piping Guidelines

Recommendations for designing and installing chilled water piping systems for optimal performance.

Flow Switch

Installation and calibration of flow switches for evaporator and condenser water lines.

Glycol Solutions

Guidelines for using glycol in chilled water systems for freeze protection.

Condenser Water Piping

Guidelines for arranging condenser water piping for proper operation and efficiency.

Refrigerant Piping

Packaged Unit Refrigerant Piping

Description of refrigerant circuits and factory-installed piping for packaged units.

Guidelines for Field Piping

Standards and recommendations for designing and installing field refrigerant piping.

Relief Valve Piping

Requirements for safe discharge piping of pressure relief valves.

Pressure Drop Data

Water Pressure Drop

Importance of maintaining water flow rates within specified limits for optimal performance.

Condenser Pressure Drop Data

Tables and curves detailing pressure drop across condenser for various flow rates.

Evaporator Pressure Drop Data

Tables detailing pressure drop across evaporator for various flow rates.

Dimensions and Weights - Packaged Units

Dimensions and Weights - Condenserless Units

Detailed physical dimensions and weight specifications for condenserless chiller models.

Lifting and Mounting Weights

Vibration Isolators

Recommendations and part numbers for vibration isolation kits and mounting locations.

Physical Data - Packaged Units

Physical Data - - Units Less Condenser

Comprehensive technical specifications for units without condensers.

Electrical Data

Notes for Electrical Data Single Point Power

Guidelines for single-point power supply wiring, including wire sizing and grounding.

Field Wiring Diagram (Packaged Units)

Schematic illustrating field wiring connections for packaged chiller units.

Field Wiring Diagram (Units less condenser)

Schematic illustrating field wiring connections for units without condensers.

Unit Configuration

Control Panel Layout

Identification of components and layout within the chiller's electrical control panel.

Motor Protection Module

Function and operation of the motor protection system for compressor safety.

Unit Controller Operation

MicroTech II Controller

Detailed description of the MicroTech II controller's software, features, and operator interface.

Setpoints

Explanation of adjustable setpoints for unit operation, including default values and passwords.

Events & Alarms

Information on unit events, alarms, triggers, and recommended actions for troubleshooting.

EXV Control

Explanation of the Electronic Expansion Valve (EXV) control logic and superheat targets.

Using the Controller

Guidance on navigating the controller menus, understanding screens, and performing edits.

Set Compressor Setpoints

Configuration of compressor anti-recycle timers and staging parameters.

Compressor Motor Protection Module

Warning Codes (Green LED Flash Code)

Interpretation of green LED flash codes indicating communication or short cycling issues.

Alert;Lockout Codes (Red LED Flash Code)

Interpretation of red LED flash codes for motor protection and lockout conditions.

Startup and Shutdown Procedures

Pre Start-up

Essential checks and preparations required before initial unit start-up.

Start-up after Extended Shutdown

Step-by-step procedure for safely starting the unit after a prolonged period of inactivity.

Flow Switch Installation and Calibration

Flow Switch Setup

Instructions for installing, wiring, and calibrating the flow switch for proper water flow detection.

Sequence of Operation

Start-up;Compressor Staging

Logic for compressor staging based on water temperature and timers.

Automatic Pump Down

Procedure for automatic pump down when the last compressor shuts off.

Condenser Fan Control

How condenser fans are controlled based on discharge pressure for optimal performance.

System Maintenance

Compressor Lubrication

Guidelines for checking and maintaining compressor oil levels and types.

Filter-Driers

Procedure for replacing filter-driers to ensure system cleanliness and performance.

Thermostatic Expansion Valve

Information on adjusting the thermostatic expansion valve for proper superheat control.

Maintenance Schedule

Troubleshooting Chart

Warranty Registration Form (Scroll)

Pre Start-Up Checklist

A checklist to be completed before submitting the warranty registration form.

Limited Product Warranty

Daikin WGZ200DW Specifications

General IconGeneral
BrandDaikin
ModelWGZ200DW
CategoryChiller
LanguageEnglish

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