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Daikin DZ20VC Service Manual

Daikin DZ20VC
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© 2014-2017, 2020
RSD6215002r8
September 2020
DZ20VC Inverter Heat Pump Condenser Units
with R-410A Refrigerant
Blowers, Coils, & Accessories
Service Instructions
O
NLY
PERSONNEL
THAT
HAVE
BEEN
TRAINED
TO
INSTALL
,
ADJUST
,
SERVICE
OR
REPAIR
(
HEREINAFTER
, “
SERVICE
”)
THE
EQUIPMENT
SPECIFIED
IN
THIS
MANUAL
SHOULD
SERVICE
THE
EQUIPMENT
. T
HE
MANUFACTURER
WILL
NOT
BE
RESPONSIBLE
FOR
ANY
INJURY
OR
PROPERTY
DAMAGE
ARISING
FROM
IMPROPER
SERVICE
OR
SERVICE
PROCEDURES
. I
F
YOU
SERVICE
THIS
UNIT
,
YOU
ASSUME
RESPONSIBILITY
FOR
ANY
INJURY
OR
PROPERTY
DAMAGE
WHICH
MAY
RESULT
. I
N
ADDITION
,
IN
JURISDICTIONS
THAT
REQUIRE
ONE
OR
MORE
LICENSES
TO
SERVICE
THE
EQUIPMENT
SPECIFIED
IN
THIS
MANUAL
,
ONLY
LICENSED
PERSONNEL
SHOULD
SERVICE
THE
EQUIPMENT
. I
MPROPER
INSTALLATION
,
ADJUSTMENT
,
SERVICING
OR
REPAIR
OF
THE
EQUIPMENT
SPECIFIED
IN
THIS
MANUAL
,
OR
ATTEMPTING
TO
INSTALL
,
ADJUST
,
SERVICE
OR
REPAIR
THE
EQUIPMENT
SPECIFIED
IN
THIS
MANUAL
WITHOUT
PROPER
TRAINING
MAY
RESULT
IN
PRODUCT
DAMAGE
,
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
.
Cancer and Reproductive Harm -
www.P65Warnings.ca.gov
PROP 65 WARNING
FOR CALIFORNIA CONSUMERS
0140M00517-A
WARNING

Table of Contents

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Daikin DZ20VC Specifications

General IconGeneral
TypeInverter
RefrigerantR-410A
StagesVariable Speed
HSPF RatingUp to 10
Power Supply208/230V, 1-Phase, 60Hz
Heating Capacity24, 000 - 60, 000 BTU/h
Warranty12-Year Parts Limited Warranty
Indoor Unit Noise Level37 dB
Outdoor Unit Noise Level54 dB
Indoor Unit Dimensions (WxHxD)Varies by model
Indoor Unit WeightVaries by model
Energy Efficiency Ratio (EER)13 EER

Summary

Important Information

Important Notices for Consumers and Servicers

Provides critical notices for users and service personnel regarding safety and system operation.

Safe Refrigerant Handling

Guidelines for safely handling refrigerants to prevent injury or death from exposure.

Product Identification

Nomenclatures

Explains the coding system used for product model identification.

Accessories

Expansion Valves

Details the expansion valve kits compatible with the unit models.

Testing Capacitor Resistance

Replacing the Control Board

Uninstall the Control Board

Step-by-step guide for safely removing the control board from the unit.

Install the Control Board

Step-by-step guide for installing a new control board.

System Operation

Unit Components and Cycles

Explains the function and components of the condensing unit and operational cycles.

System Setup and Modes

Covers startup tests, charge mode, lockouts, boost, and dehumidification.

Advanced System Controls

Covers Daikin One+ features, error history, status, pump down, and system test.

Cooling and Heating Configuration

Covers cool settings, airflow profiles, heat settings, CFM trim, and delays.

Refrigerant Cycle Diagrams

Illustrates refrigerant piping for TXV and EEV applicable indoor units.

Troubleshooting

Cooling Analysis Chart

Analyzes cooling issues based on system parameters.

Heating Analysis Chart

Analyzes heating issues based on system parameters.

Servicing Procedures

Electrical Checks and Wiring Verification

Covers voltage, wiring, transformer, and heater resistance checks.

Thermostat and Control Circuit Checks

Verifies thermostat, communicating systems, and control circuits.

High Pressure Switch and Pressure Sensor Checks

Tests high pressure switch and pressure sensors.

Compressor Electrical Safety Checks

Explains hazards and checks related to compressor electrical terminals.

Servicing Procedures (Continued)

Compressor Winding and Ground Tests

Tests compressor winding resistance and performs ground tests.

Temperature Sensors and EEV Coil Resistance Test

Tests temperature sensors and EEV coil resistance.

EEV Coil Resistance Test

Procedure to check the resistance of the EEV coil.

Heater Control and Motor Circuit Troubleshooting

Covers heater control, motor circuits, and sequencer outputs.

Servicing Procedures (Continued)

Network Communications Troubleshooting

Troubleshooting network communications for integrated systems.

DV**PEC Heater Control and Motor Circuits

Covers DV**PEC heater control, motor circuits, and sequencer outputs.

Heater Limit Control and Element Checks

Checks heater limit controls and elements.

Optional Electric Heaters Information

Information on optional electric heaters and installation.

Servicing Procedures (Continued)

Heater Limit Control and Fuse Link Checks

Checks heater limit controls and fuse links.

Servicing Procedures (Continued)

Refrigeration Repair Practices and Brazing

Essential practices for safe and effective refrigeration system repair and brazing.

Leak Testing Procedures

Procedures for leak testing using nitrogen.

Servicing Procedures (Continued)

System Evacuation Procedures

Detailed steps for system evacuation to remove air and moisture.

System Charging Procedures

Procedures for charging the system with the correct refrigerant amount.

Servicing Procedures (Continued)

Compressor Efficiency and TXV Checks

Checks compressor efficiency, TXV function, overfeeding, and underfeeding.

Superheat and TXV Operation

How to check superheat and test TXV operation.

Servicing Procedures (Continued)

Superheat and Subcooling Measurement

How to check superheat and subcooling.

TXV Operation Test and Non-Condensables

Tests TXV operation and identifies non-condensables.

Servicing Procedures (Continued)

Subcooling Adjustment for EEV Applications

Adjusting subcooling for EEV systems.

Servicing Procedures (Continued)

Compressor Burnout Diagnosis

Steps to diagnose and confirm compressor burnout.

Refrigerant Piping Best Practices

Best practices for refrigerant piping installation.

Refrigerant Piping Installation

Vertical and Horizontal Piping Diagrams

Illustrates different piping installation configurations.

Servicing Procedures (Continued)

Outdoor Unit Above Indoor Unit Installation

Guidelines for installing the outdoor unit above the indoor coil.

Servicing Procedures (Continued)

Outdoor Unit Below Indoor Unit Installation

Guidelines for installing the outdoor unit below the indoor coil.

Burying Refrigerant Lines

Checklist for burying refrigerant lines properly.

Airflow and Static Pressure

Duct Static Pressures and Coil Drop

Information on duct static pressures and coil pressure drops.

Air Handler External Static Measurement

Procedure to measure total external static pressure for air handlers.

Airflow Consideration

System Operating Mode Airflow Management

How airflow demands are managed in different system operating modes.

Indoor Unit Troubleshooting (TXV)

Control Board, Alarms, and Blower Description

Covers control board diagram, alarms, and blower.

ESD Precautions and Diagnostic Chart

Covers ESD precautions and the diagnostic chart.

Fault Recall Feature

How to use the fault recall feature to view stored errors.

Indoor Unit Troubleshooting (TXV) (Continued)

Diagnostic Codes Reference

Table listing diagnostic codes and their conditions.

Indoor Unit Error Codes (DV*PEC*)

Indoor Unit Troubleshooting (EEV)

Control Board, Alarms, and Blower Description

Covers control board diagram, alarms, and blower.

ESD Precautions and Fault Recall

Covers ESD precautions, diagnostic chart, and fault recall.

2-Digit Display and Fault History Navigation

Explains 2-digit display codes and fault history navigation.

Indoor Unit Troubleshooting (EEV) (Continued)

Diagnostic Codes Reference

Table listing diagnostic codes and their conditions.

2-Digit 7 Segment Display Codes (EEV)

Setting the Mode Display

Mode Display Introduction and Button Layout

Introduction to the display and its buttons.

Fault Code History Navigation

How to access and navigate the system's fault history.

Indoor Unit (DV*PEC*) Error Codes

Emergency Mode Operation (EEV)

Heating Emergency Mode

How to operate the unit in heating emergency mode.

Dipswitch Settings for Emergency Modes

Settings for heater kit, cooling, and heating emergency modes.

Cooling Emergency Mode Operation

How to operate the unit in cooling emergency mode.

Cooling Emergency Mode Wiring (TXV)

Outdoor Unit Mode Display Operation

Mode Display Introduction and Navigation

Introduction to the 3-digit display and how to navigate.

Button Layout and Modes Overview

Identifies display buttons and available modes.

Navigating Through Display Screens

Flowchart explaining how to navigate display screens.

Fault Code History Navigation

How to access and navigate fault code history.

Outdoor Unit Mode Display Operation (Continued)

Monitoring Mode Navigation

How to navigate and monitor system variables.

Settings Mode 1 Navigation

How to navigate and adjust settings in Mode 1.

Settings Mode 2 Navigation

How to navigate and adjust settings in Mode 2.

7-Segment Display-Outdoor Unit

Screen 0, 1, and 2 Display Functions

Explains displays for Fault Code, History, and Monitor modes.

Screen 3 (Setting Mode 1) Settings

Explains settings available in Setting Mode 1.

Screen 4 (Setting Mode 2) Settings

Explains settings available in Setting Mode 2.

Outdoor Unit Error Codes

Re-writing Shared Data via Memory Card

Zoomed View of 20 SEER OD Control Board

Network Troubleshooting

LED Status Indicators and Actions

Table explaining LED indicators for network status and troubleshooting.

Thermistor Resistance and Temperature Characteristics

Pressure vs Temperature Chart (R-410A)

Liquid Line Temperature Chart

Wiring Diagram - 2 Tons (DZ20VC0241**)

Wiring Diagram - 3-5 Tons (DZ20VC Models)

Wiring Diagram - Indoor Unit (TXV)

CTK04 Addendum - Wiring and Identification

Wiring Codes and Component Identification

Table of wiring color codes and component designations.

CTK04 Addendum (Thermostat)

Thermostat Overview and Wiring

Overview of the CTK04 thermostat system and its wiring.

CTK04 Addendum - System Start-Up Test

CTK04 Addendum - Thermostat Configuration: Charge Mode

CTK04 Addendum - Boost Mode Configuration

CTK04 Addendum - Dehumidification Configuration

Dehumidification Operation and Tips

Explanation and tips for dehumidification operation.

Dehumidification Select Settings

Explains different settings for dehumidification based on demand.

CTK04 Addendum - Thermostat Configuration: Maximum Compressor Speed

CTK04 Addendum - Thermostat Configuration: Indoor Air CFM Trim

CTK04 Addendum - Thermostat Configuration: Airflow Profile and Delays

CTK04 Addendum - Thermostat Operation: Force Defrost Cycle

CTK04 Addendum - Thermostat Operation: Pump Down

CTK04 Addendum - Thermostat Operation: 7-Segment Pump Down

CTK04 Addendum - Thermostat Operation: System Status Check

Indoor Unit Troubleshooting (EEV) - Diagnostics and Identification

Diagnostics Menu Navigation

Accessing diagnostics menu for fault history.

Identification Menu Information

Information on identifying unit model, serial number, and software.

Indoor Unit Set-Up and Status Menus

Set-Up Menu Options

Menu for configuring system accessories and settings.

System Status Information

Displays current system status information.

Heat Pump Advanced Feature Menu

Diagnostics and Status Information

Accessing diagnostic fault codes and system status.

System Setup Configuration

Menu for resetting settings and configuring system parameters.

Equipment Test Procedures

Running system verification and defrost cycle tests.

System Maintenance Procedures

Procedures for PUMP DOWN and CHARGE MODE.

Heat Pump Advanced Feature Menu (Continued)

Cooling Setup Options

Settings for cooling airflow profiles, delays, and dehumidification.

Cooling Run Values Configuration

Setting compressor speed ranges for cooling.

Heating Setup Options

Settings for heating airflow, delays, and defrost.

Heating Run Values Configuration

Setting compressor speed ranges for heating.

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