Goodman ComfortNet ASXC180601AD User Manual

RS6200007r14
December 2017
This manual is to be used by qualified, 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 unqualified person.
Copyright © 2015-2017 Goodman Manufacturing Company, L.P.
ComfortNet™
ASXC, DSXC, and GSXC Condensing Units,
ASZC, DSZC and GSZC
Split System Heat Pumps
with R-410A Refrigerant
Blowers, Coils, & Accessories
Service Instructions
is a registered trademark of Maytag Corporation or its related companies and is used under license to Goodman Company, L.P., Houston, TX. All rights reserved.

Goodman ComfortNet ASXC180601AD Specifications

General

Brand	Goodman
Model	ComfortNet ASXC180601AD
Category	Heat Pump
Language	English

Summary

Service Instructions ComfortNet ASXC, DSXC, and GSXC Condensing Units, ASZC, DSZC and GSZC Split System Heat Pumps with R-410A Refrigerant Blowers, Coils, & Accessories

SAFE REFRIGERANT HANDLING

WARNING REFRIGERANTS ARE HEAVIER THAN AIR.

Safety precautions for handling refrigerants due to their density and potential hazards.

WARNING SYSTEM CONTAMINANTS, IMPROPER SERVICE PROCEDURE AND/OR PHYSICAL ABUSE AFFECTING HERMETIC COMPRESSOR ELECTRICAL TERMINALS MAY CAUSE DANGEROUS SYSTEM VENTING.

Warning about system contaminants and improper procedures causing compressor venting.

WARNING TO AVOID POSSIBLE EXPLOSION, USE ONLY RETURNABLE (NOT DISPOSABLE) SERVICE CYLINDERS WHEN REMOVING REFRIGERANT FROM A SYSTEM.

Safety guidelines for using refrigerant cylinders to prevent explosions.

WARNING TO AVOID POSSIBLE EXPLOSION:

Precautions to avoid explosions when working with refrigerant cylinders.

WARNING THE UNITED STATES ENVIRONMENTAL PROTECTION AGENCY ("EPA") HAS ISSUED VARIOUS REGULATIONS REGARDING THE INTRODUCTION AND DISPOSAL OF REFRIGERANTS INTRODUCED INTO THIS UNIT.

Information on EPA regulations for refrigerant handling and disposal.

PRODUCT IDENTIFICATION

PRODUCT IDENTIFICATION (Continued)

ASXC16 AMANA BRAND SPLIT X-COMMUNICATING CONDENSERS R-410A 16 SEER

GSXC16 GOODMAN BRAND SPLIT X-COMMUNICATING CONDENSERS R-410A 16 SEER

DSXC16 DELUXE SPLIT X-COMMUNICATING CONDENSERS R-410A 16 SEER

ASZC16 AMANA BRAND SPLIT Z-COMMUNICATING HEAT PUMP R-410A 16 SEER

GSZC16 GOODMAN BRAND SPLIT Z-COMMUNICATING HEAT PUMP R-410A 16 SEER

DSZC16 DELUXE SPLIT Z-COMMUNICATING HEAT PUMP R-410A 16 SEER

AVPTC****14 SINGLE PIECE AIR HANDLER MULTIPLE-POSITION VARIABLE SPEED PAINTED TXV WITH 4-WIRE COMMUNICATING CONTROL

MBVC MODULAR BLOWER AIR HANDLER V-MULTI-POSITION VARIABLE-SPEED COMMUNICATING READY W/4-WIRES

CHPF C-INDOOR COIL HORIZONTAL A-COIL PAINTED FLOWRATOR

CAPF C-INDOOR COIL A-UPFLOW/DOWNFLOW PAINTED FLOWRATOR

CSCF C-INDOOR COIL S-HORIZONTAL SLAB COIL C-UNPAINTED FLOWRATOR

ASXC18 AMANA BRAND SPLIT X-COMMUNICATING CONDENSERS R-410A 18 SEER

GSXC18 GOODMAN BRAND SPLIT X-COMMUNICATING CONDENSERS R-410A 18 SEER

DSXC18 DELUXE SPLIT X-COMMUNICATING CONDENSERS R-410A 18 SEER

ASZC18 AMANA BRAND SPLIT Z-COMMUNICATING HEAT PUMPS R-410A 18 SEER

GSZC18 GOODMAN BRAND SPLIT Z-COMMUNICATING HEAT PUMP R-410A 16 SEER

DSZC18 DELUXE SPLIT Z-COMMUNICATING HEAT PUMP R-410A 18 SEER

CAUF C-INDOOR COIL A-UPFLOW/DOWNFLOW UNCASED FLOWRATOR

CAPT C-INDOOR COIL A-UPFLOW/DOWNFLOW PAINTED CASED FLOWRATOR W/TXV

ACCESSORIES

ACCESSORIES (Continued)

EXPANSION VALVE KITS

Diagrams and instructions for installing expansion valve kits.

FSK01A FREEZE THERMOSTAT KIT

Wiring diagram and installation guide for the FSK01A freeze thermostat kit.

HK* SERIES ELETRIC HEAT KITS - ELECTRIC HEAT KIT APPLICATIONS - MBVC

Compatibility chart for HK* series electric heat kits with MBVC blowers.

ELECTRIC HEAT KIT APPLICATIONS - AVPTC

Compatibility chart for electric heat kits with AVPTC models.

AVPTC**14**

Heat kit application compatibility for AVPTC**14** models.

READY 15 AVPTC

Heat kit application compatibility for READY 15 AVPTC models.

PRODUCT DESIGN (Continued)

CAPACITY CONTROL - COMFORTNET MODELS

Explanation of capacity control mechanisms in ComfortNet models.

Communicating Unitary Control (UC) PCB

Description of the UC PCB's role in communicating HVAC systems.

SYSTEM OPERATION

COOLING

Explanation of the refrigerant cycle, cooling process, and components.

HEATING

Description of the heating cycle, refrigerant flow reversal, and components.

SYSTEM OPERATION (Continued)

DEFROST CYCLE - COMFORTNET MODELS

Explanation of the defrost cycle control and operation for ComfortNet models.

COOLING CYCLE

Diagram illustrating the refrigerant flow during cooling operation.

EXPANSION VALVE/CHECK VALVE ASSEMBLY IN COOLING OPERATION

Diagram of the expansion valve/check valve assembly during cooling.

HEATING CYCLE

Diagram illustrating the refrigerant flow during heating operation.

EXPANSION VALVE/CHECK VALVE ASSEMBLY IN HEATING OPERATION

Diagram of the expansion valve/check valve assembly during heating.

TROUBLESHOOTING CHART

POSSIBLE CAUSE

Lists potential causes for system malfunctions.

SYMPTOM

Describes observable symptoms of system problems.

System Operating Pressures

Indicates abnormal system pressures as symptoms.

Test Method Remedy

Outlines diagnostic tests and corrective actions.

SERVICING TABLE OF CONTENTS

S-13 CHECKING LOW PRESSURE CONTROL

Procedure for testing the low pressure control.

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

SERVICING (Continued)

S-1 CHECKING VOLTAGE

Procedure for checking system voltage.

S-6 CHECKING TIME DELAY RELAY

Procedure for testing time delay relays.

S-12 CHECKING HIGH PRESSURE CONTROL

Procedure for testing the high pressure control.

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

Method for checking capacitor capacitance with a multimeter.

S-17 CHECKING COMPRESSOR

Procedure for checking the hermetic compressor terminals and safety.

S-17C UNLOADER TEST PROCEDURE

Procedure for testing the compressor unloader operation.

S-17D OPERATION TEST

Procedure for testing compressor operation.

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

Procedure for testing temperature sensors.

S-110 CHECKING EXPANSION VALVE OPERATION

Network Troubleshooting

7 SEGMENT LED (characters will alternate) DESCRIPTION OF CONDITION

Table mapping 7-segment LED codes to specific system conditions.

ComfortNet Thermostat Only Symptoms of Abnormal Operation (Communicating & Non-communicating Thermostat)

Abnormal operation symptoms for ComfortNet thermostats.

Diagnostic/Status LED Codes Fault Description Message Code Possible Causes Corrective Actions Notes & Cautions

Table correlating symptoms, codes, causes, and actions.

Symptoms of Abnormal Operation (Legacy & ComfortNet Thermostat) Diagnostic/Status LED Codes Fault Description Message Code Possible Causes Corrective Actions Notes & Cautions

Table correlating symptoms, codes, causes, and actions for various thermostats.

ComfortNet Thermostat Only Symptoms of Abnormal Operation (Communicating & Non-communicating Thermostat) Diagnostic/Status LED Codes Fault Description Message Code Possible Causes Corrective Actions Notes & Cautions

Table correlating symptoms, codes, causes, and actions for ComfortNet thermostats.

ECM MOTOR

7 SEGMENT LED (DS2) 7 SEGMENT LED (DS1) DESCRIPTION OF CONDITION

Table mapping 7-segment LED displays to system conditions.

UNITARY DIAGNOSTIC CODES

Table of unitary diagnostic codes for air handler control modules.

Emerson UltraCheck-EZ Diagnostic Tool

Electrical Checks - Low Voltage Control Circuits

Motor Checks

Motor Control Circuits

Checking Bias Voltage:

1.0 Cooling Operation - Low and High Stage Cool

Detailed steps for cooling operation in ComfortNet systems.

2.0 Heating Operation

Detailed steps for heating operation based on outdoor temperature.

5.1 The CTK0* thermostat sends a request for emergency heat to the air handler/modular blower.

Thermostat request for emergency heat to air handler/modular blower.

Each individual heater element is protected with a limit control device connected in series with each element to prevent overheating of components in case of low airflow. This limit control will open its circuit at approximately 150°F.

To avoid the risk of fire or explosion, never use oxygen, high pressure air or flammable gases for leak testing of a refrigeration system.

Warning against using flammable gases for leak testing.

WARNING REFRIGERANT UNDER PRESSURE! * Do not overcharge system with refrigerant. * Do not operate unit in a vacuum or at negative pressure.

Warning regarding refrigerant pressure and vacuum operation.

CHECKING COMPRESSOR EFFICIENCY

S-2 CHECKING WIRING

Procedure for inspecting and verifying wiring.

S-8A CHECKING UNITARY (UC) CONTROL COMPRESSOR CONTACTOR/RELAY CONTACTS

Procedure for checking UC control compressor contactor/relay contacts.

S-14 CHECKING HIGH AND LOW PRESSURE SWITCH VOLTAGE

Procedure for checking voltage at pressure switches.

S-16G CHECKING EMERSON ULTRATECH ECM MOTORS

Procedure for checking Emerson Ultratech ECM motors.

S-16H ECM CFM ADJUSTMENTS AVPTC/MBVC

Adjusting CFM settings for AVPTC/MBVC ECM motors.

S-17A RESISTANCE TEST

Procedure for testing compressor winding resistance.

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

Description of the AVPTC/MBVC electronic control.

S-112 CHECKING RESTRICTED LIQUID LINE

COMMUNICATIONS TROUBLESHOOTING CHART

Chart for diagnosing network issues based on LED status.

PCBJA104 AIR HANDLER DIAGNOSTIC CODES

CHECKING FAN RELAY CONTACTS - ECM FAN MOTOR

PCBHR101-103 PBBGR101-102

PCBHR104

PCBHR105

Electrical Checks - High Voltage Power Circuits

Motor Control/End Bell Checks

Electric Heat Sequencer Outputs

Reconnect communicating wires from outdoor board check voltage again

2.0 Heating Operation - Auxiliary/Emergency Heat

Operation of auxiliary and emergency heat modes.

Outdoor Temperature Above the Heat Pump Balance Point

5.2 The air handler control energizes the ECM blower motor at the emergency heat speed.

Air handler control energizes ECM blower motor for emergency heat.

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

To avoid possible explosion, the line from the nitrogen cylinder must include a pressure regulator and a pressure relief valve. The pressure relief valve must be set to open at no more than 150 psig.

Safety precautions for using nitrogen for leak testing.

S-115 COMPRESSOR BURNOUT

Troubleshooting compressor burnout and system cleanup.

S-3E CTK0*** COMFORTNET THERMOSTAT

Information about the CTK0*** ComfortNet thermostat system.

S-4 CHECKING TRANSFORMER AND CONTROL CIRCUIT

Procedure for checking transformer and control circuit.

S-9 CHECKING HIGH AND LOW VOLTAGE TO ECM MOTOR

Procedure for checking voltage to the ECM motor.

S-15 CHECKING CAPACITOR

Procedure for checking capacitors.

S-17B GROUND TEST

Procedure for testing the compressor for ground faults.

S-21 CHECKING REVERSING VALVE AND SOLENOID

Procedure for checking the reversing valve and solenoid.

S-113 OVERCHARGE OF REFRIGERANT

PCBJA101- PCBJA102 AIR HANDLER DIAGNOSTIC CODES

CHECKING RELAY CONTACTS - PSC FAN MOTOR

Data Line Voltage Troubleshooting and Bias Switches

Outdoor Temperature Below the Heat Pump Balance Point

5.3 The system operates at emergency heat.

S-62 CHECKING HEATER ELEMENTS

Pressure test the system using dry nitrogen and soapy water to locate leaks.

CAUTION Damage to the unit caused by operating the compressor with the suction valve closed is not covered under the warranty and may cause serious compressor damage.

S-10A COPELAND COMFORT ALERT - UNITARY (UC) CONTROL DIAGNOSTICS

Diagnostics for Copeland Comfort Alert on UC control.

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

Method for checking capacitor resistance with a multimeter.

S-24 TESTING DEFROST CONTROL

Procedure for testing the defrost control.

S-102 EVACUATION

S-104 CHECKING COMPRESSOR EFFICIENCY

S-114 NON-CONDENSABLES

5.4 The thermostat demand is satisfied, the CTK0* thermostat commands the air handler/modular blower to end emergency heat operation.

Charge the system with the exact amount of refrigerant. Refer to the specification section or check the unit nameplates for the correct refrigerant charge. An inaccurately charged system will cause future problems.

S-106 OVERFEEDING

4.0 Defrost Operation

Explanation of the defrost cycle operation.

REFRIGERANT UNDER PRESSURE! * Do not overcharge system with refrigerant. * Do not operate unit in a vacuum or at negative pressure.

Warning regarding refrigerant pressure and vacuum operation.

S-107 UNDERFEEDING

IMPORTANT NOTE: Because of the potential damage to compressors, do not allow suction pressure at service valve to drop below 20 PSIG when pumping unit system down for repair.

DO NOT charge liquid R410A into the compressor.

Instruction not to charge liquid R410A directly into the compressor.

S-108 SUPERHEAT

S-61A CHECKING HEATER LIMIT CONTROL(S)

S-103 CHARGING

CAUTION To prevent personal injury, carefully connect and disconnect manifold gauge hoses. Escaping liquid refrigerant can cause burns. Do not vent refrigerant to atmosphere. Recover during system repair or final unit disposal.

Caution regarding safe connection/disconnection of gauge hoses.

S-109 CHECKING SUBCOOLING