Daikin ComfortNet DZ18TC0481CA User Manual

1
Service Instructions
ComfortNet™
DX16TC & DX18TC Condensing Units,
DZ16TC & DZ18TC Split System Heat Pumps
with R-410A Refrigerant
Blowers, Coils, & Accessories
This manual is to be used by qualied, professionally trained HVAC technicians only. Goodman
does not assume any responsibility for property damage or personal injury due to improper
service procedures or services performed by an unqualied person.
Copyright © 2015-2020 Daikin Manufacturing Company, L.P.
RSD6200007r21
March 2020

Daikin ComfortNet DZ18TC0481CA Specifications

General

Brand	Daikin
Model	ComfortNet DZ18TC0481CA
Category	Air Conditioner
Language	English

Summary

Service Instructions

Important Information

Safe Refrigerant Handling

Guidelines for safe handling of refrigerants to prevent injury or death.

System Operation

Defrost Cycle - ComfortNet™ Models

Troubleshooting Chart

Servicing

S-1 Checking Voltage

Procedure to test system voltage and locked rotor voltage.

S-2 Checking Wiring

Steps to visually inspect and check wiring for damage or loose connections.

Communications Troubleshooting Chart

Chart detailing LED status for network communication troubleshooting.

PCBJA101- PCBJA102 Air Handler Diagnostic Codes

Troubleshooting codes for air handler integrated control module.

S-4 Checking Transformer And Control Circuit

Procedure to test the transformer and control circuit for proper voltage.

S-9 Checking High and Low Voltage to ECM Motor

Procedure to check high and low voltage supply to the ECM motor.

S-10A Copeland Comfort Alert™ - Unitary (UC) Control Diagnostics

Diagnostics for the Copeland Comfort Alert™ system.

Unitary Diagnostic Codes

Table of diagnostic codes for unitary controls and their meanings.

S-12 Checking High Pressure Control

Procedure to check the high pressure control for cut-out pressure.

S-13 Checking Low Pressure Control

S-15 Checking Capacitor

S-16G Checking Emerson Ultratech™ ECM Motors

Emerson UltraCheck-EZ™ Diagnostic Tool

Electrical Checks - High Voltage Power Circuits

S-16H ECM CFM Adjustments DVPTC/MBVC

S-17 Checking Compressor

Procedures for checking compressor continuity, ground, and windings.

S-17C Unloader Test Procedure

S-21 Checking Reversing Valve and Solenoid

S-26 Testing Temperature Sensors (ComfortNet Ready Models Only)

S-100 Refrigeration Repair Practice

General guidelines and safety precautions for refrigeration system repairs.

S-103 Charging

Procedures for charging refrigerant and adjusting TXV for proper system operation.

S-108 Superheat

S-115 Compressor Burnout

Steps to diagnose and address compressor burnout issues.

Air Handler Static Pressure Readings

Wiring Diagrams