Daikin ComfortNet DX18TC0601AA 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 DX18TC0601AA Specifications

General

Model	DX18TC0601AA
SEER Rating	18
Refrigerant	R-410A
Energy Star Certified	Yes
Stages	Variable Speed
Voltage (V)	208/230
Phase	1
Frequency (Hz)	60
Type	Air Conditioner
Cooling Capacity	60000 BTU
HSPF Rating	Not Applicable

Summary

Service Instructions

IMPORTANT INFORMATION

IMPORTANT NOTICES FOR CONSUMERS AND SERVICERS

Recognize safety symbols, words, and labels for safe operation and maintenance.

SAFE REFRIGERANT HANDLING

Guidelines for safe refrigerant handling, including breathing hazards and frostbite prevention.

PRODUCT IDENTIFICATION

SYSTEM OPERATION

DEFROST CYCLE - COMFORTNET™ MODELS

Details on the defrost cycle control, timing, and operation for ComfortNet™ models.

TROUBLESHOOTING CHART

SERVICING

S-1 CHECKING VOLTAGE

Procedure for checking voltage at various points in the system, including locked rotor voltage.

Network Troubleshooting

S-4 Checking Transformer And control circuit

Procedure to check the transformer's primary and secondary voltage for proper operation.

S-9 CHECKING HIGH AND LOW VOLTAGE TO ECM MOTOR

Procedure to measure high and low voltage supplied to the ECM motor and check fan relay contacts.

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

Introduction to Copeland Comfort Alert™ diagnostics integrated into the UC control for fault monitoring.

S-12 CHECKING HIGH PRESSURE CONTROL

Procedure to check the high pressure control cutout pressure and continuity.

S-15B CAPACITANCE CHECK USING A DIGITAL MULTI-METER (IN CAPACITANCE MODE)

Emerson UltraCheck-EZ™ Diagnostic Tool

Instructions for using the Emerson UltraCheck-EZ™ tool to diagnose ECM motors.

Electrical Checks - Low Voltage Control Circuits

S-16H ECM CFM ADJUSTMENTS DVPTC/MBVC

S-17 CHECKING COMPRESSOR

Safety warnings and procedures for checking compressor terminal venting and physical integrity.

S-17C UNLOADER TEST PROCEDURE

S-21 CHECKING REVERSING VALVE AND SOLENOID

S-26 TESTING TEMPERATURE SENSORS (COMFORTNET READY MODELS ONLY)

Procedure to check outdoor air and coil temperature sensors for resistance and proper function.

4.0 Defrost Operation

S-61A CHECKING HEATER LIMIT CONTROL(S)

Procedure to check the continuity of heater limit controls.

S--101 LEAK TESTING (NITROGEN OR NITROGEN-TRACED)

Procedure for leak testing the system using dry nitrogen and soapy water or a leak detector.

S-103 CHARGING

Instructions for charging the system with refrigerant, including subcooling and superheat adjustments.

S-104 CHECKING COMPRESSOR EFFICIENCY

Method to check compressor efficiency by analyzing scroll flank condition and performance tests.

S-109 CHECKING SUBCOOLING

Procedure for checking refrigerant subcooling using pressure and temperature readings.

CHECKING COMPRESSOR EFFICIENCY

Method to check compressor efficiency by analyzing scroll flank condition and performance tests.

S-115 COMPRESSOR BURNOUT

Procedure for diagnosing compressor burnout, analyzing oil samples, and cleaning the system.

S-2 CHECKING WIRING

Steps for visually inspecting and testing wiring for damage, shorts, and loose connections.

COMMUNICATIONS TROUBLESHOOTING CHART

S-13 CHECKING LOW PRESSURE CONTROL

Procedure to check the low pressure control cutout and cutout/cut-in pressures.

S-16G CHECKING EMERSON ULTRATECHTM ECM MOTORS

General checks and considerations for diagnosing Emerson Ultratech™ ECM motors.

Electrical Checks - High Voltage Power Circuits

S-17A Resistance Test

Procedure for testing compressor winding resistance and internal overload.

S-24 TESTING DEFROST CONTROL

S-40A DVPTC/MBVC ELECTRONIC BLOWER/HEATER CONTROL

5.0 Emergency Heat Operation

S-61B CHECKING HEATER FUSE LINK (OPTIONAL ELECTRIC HEATERS)

Procedure to check the continuity of the optional electric heater fuse link.

S-102 EVACUATION

Procedure for evacuating the system to achieve a proper vacuum, including micron readings.

S-106 OVERFEEDING

S-110 CHECKING EXPANSION VALVE OPERATION

S-8A Checking Unitary (UC) Control Compressor Contactor/Relay Contacts

S-14 CHECKING HIGH AND LOW PRESSURE SWITCH VOLTAGE

S-17B Ground Test

Procedure for checking for ground faults in the compressor circuit.

S-60 ELECTRIC HEATER (OPTIONAL ITEM)

S-62 CHECKING HEATER ELEMENTS

Instructions for visually inspecting and testing heater elements for continuity.

S-107 UNDERFEEDING

S-112 CHECKING RESTRICTED LIQUID LINE

S-15 CHECKING CAPACITOR

S-100 REFRIGERATION REPAIR PRACTICE

General practices and safety precautions for repairing refrigeration systems.

S-108 SUPERHEAT

Explanation of superheat and procedures for checking and adjusting it.

S-113 OVERCHARGE OF REFRIGERANT

S-15A RESISTANCE CHECK USING A DIGITAL MULTI-METER

CHECKING SUPERHEAT

Detailed steps and formulas for measuring refrigerant superheat.

S-114 NON-CONDENSABLES

SEQUENCE OF OPERATION

Air Handler Static Pressure Readings

S-203 Single Piece Air Handler External Static Pressure

S-203A Two Piece Air Handler External Static Pressure

WIRING DIAGRAMS