Carrier 40MHHQ12-1 User Manual

Specifications subject to change without notice.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS ....................................................... 1
INTRODUCTION............................................................................ 1
MODEL / SERIAL NUMBER NOMENCLATURES .................... 2
SPECIFICATIONS (HEAT PUMP)................................................ 3
PERFORMANCE ............................................................................ 4
DIMENSIONS AND WEIGHTS .................................................... 5
CLEARANCES................................................................................ 9
ELECTRICAL DATA ..................................................................... 10
WIRING........................................................................................... 10
CONNECTION DIAGRAMS ......................................................... 11
WIRING DIAGRAMS (HEAT PUMP) .......................................... 12
REFRIGERATION CYCLE DIAGRAMS...................................... 15
SYSTEM EVACUATION AND CHARGING ............................... 20
TROUBLESHOOTING................................................................... 27
DIAGNOSIS AND SOLUTION...................................................... 31
DISASSEMBLY INSTRUCTIONS SIZES 9K (115V) - 18K (208/
230V)................................................................................................ 51
DISASSEMBLY INSTRUCTIONS SIZE 24K............................... 54
APPENDIX ...................................................................................... 57
SAFETY CONSIDERATIONS
Installing, starting up, and servicing air-conditioning equipment can
be hazardous due to system pressures, electrical components, and
equipment location (roofs, elevated structures, etc.).
Only trained, qualified installers and service mechanics should install,
start-up, and service this equipment.
Untrained personnel can perform basic maintenance functions such as
coil cleaning. All other operations should be performed by trained
service personnel.
When working on the equipment, observe precautions in the literature
and on tags, stickers, and labels attached to the equipment.
Follow all safety codes. Wear safety glasses and work gloves. Keep a
quenching cloth and fire extinguisher nearby when brazing. Use care
in handling, rigging, and setting bulky equipment.
Read this manual thoroughly and follow all warnings or cautions
included in the literature and attached to the unit. Consult local
building codes and National Electrical Code (NEC) for special
requirements. Recognize safety information. This is the safety-alert
symbol . When you see this symbol on the unit and in instructions
or manuals, be alert to the potential for personal injury.
Understand these signal words: DANGER, WARNING, and
CAUTION. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies hazards which
could result in personal injury or death.
CAUTION is used to identify unsafe practices which may result in
minor personal injury or product and property damage.
NOTE is used to highlight suggestions which will result in enhanced
installation, reliability, or operation.
INTRODUCTION
This service manual provides the necessary information to service,
repair, and maintain the outdoor units. This manual has an appendix
with data required to perform troubleshooting. Use the “Table of
Contents” to locate a desired topic.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position.
There may be more than 1 disconnect switch. Lock out and
tag switch with a suitable warning label.
WAR N I N G
EXPLOSION HAZARD
Failure to follow this warning could result
in death, serious personal injury, and/or
property damage. Never use air or gases
containing oxygen for leak testing or
operating refrigerant compressors.
Pressurized mixtures of air or gases
containing oxygen can lead to an explosion.
WAR N I N G
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.Do not bury more than 36 in. (914 mm)
of refrigerant pipe in the ground. If any section of pipe is
buried, there must be a 6 in. (152 mm) vertical rise to the valve
connections on the outdoor units.
If more than the recommended length is buried, refrigerant
may migrate to the cooler buried section during extended
periods of system shutdown. This causes refrigerant slugging
and could possibly damage the compressor at start-up.
CAUTION
Service Manual
38MHRC
Outdoor Unit Single Zone Ductless System
Sizes 09 to 24

Carrier 40MHHQ12-1 Specifications

General

Refrigerant	R-410A
Heating Seasonal Performance Factor (HSPF)	9.0
Outdoor Unit Noise Level	50 dB(A)
Cooling Capacity	12, 000 BTU/h
Heating Capacity	12000 BTU/h
Operating Temperature (Heating)	5°F - 86°F
Outdoor Unit Dimensions (H x W x D)	550 x 700 x 275 mm

Summary

Safety Considerations

Electrical Shock Hazard

Warning about potential injury or death from electrical shock.

Explosion Hazard

Warning about explosion risk from pressurized air/oxygen mixtures.

Equipment Damage Hazard

Caution about improper installation leading to equipment damage.

Introduction

Model / Serial Number Nomenclatures

Specifications (Heat Pump)

Performance

Dimensions and Weights

Clearances

Electrical Data

Wiring

Recommended Connection Method for Power and Communication Wiring

Guides on connecting power and communication wires between units.

Caution Equipment Damage Hazard

Caution regarding proper wire sizing and secure connections.

Caution Equipment Damage Hazard

Caution on avoiding wire contact with moving parts or tubing.

Connection Diagrams

Wiring Diagrams (Heat Pump)

Refrigeration Cycle Diagrams

Refrigerant Lines

General Refrigerant Line Sizing

General rules for refrigerant line sizing and installation.

Long-Line Applications

Specific instructions for systems with extended refrigerant line lengths.

System Evacuation and Charge

Deep Vacuum Method

Method for evacuating system to 500 microns for moisture removal.

Triple Evacuation Method

Recommended method for thorough system evacuation and drying.

Final Tubing Check

Important check for tubing integrity and securing after installation.

Electronic Functions

Abbreviation

List of abbreviations for temperature sensors and other parameters.

Main Protection

Outlines the unit's primary protection mechanisms.

Compressor high temperature cutout

Protection that stops the unit if compressor overheats.

Compressor discharge temperature protection

Protection based on compressor discharge temperature.

Fan speed is out of control

Error condition when fan speed is outside operational limits.

Inverter module protection

Protection functions for the inverter module.

Indoor fan delayed open function

Delay in indoor fan operation after unit starts.

Compressor preheating functions

Function to preheat the compressor in cold conditions.

Zero crossing detection error protection

Protection related to signal timing errors.

Sensor protection at open circuit and breaking disconnection

Protection for sensor failures.

Refrigerant leakage detection

System for detecting refrigerant leaks.

Operation Modes and Functions

Describes different operating modes and fan control logic.

Indoor Fan Running Rules

Compressor Temperature Protection

Protection triggered by high compressor temperature.

Evaporator Temperature Protection

Protection triggered by low evaporator temperature.

HEATING Mode

Rules for compressor and fan operation in heating mode.

DEFROST Mode

Forced DEFROSTING Mode

Procedure to manually initiate or exit defrost mode.

Defrost Exit Conditions

Conditions that cancel the defrost mode and return to heating.

Evaporator Coil Temperature Protection

AUTO Mode

DRYING mode

FORCED OPERATION Function

Operation Rules

Rules for forced cooling and auto modes.

POINT CHECK FUNCTION

Troubleshooting

Safety

Critical safety warning about capacitor discharge.

Electrolytic Capacitors

Identification and caution regarding electrolytic capacitors.

Outdoor Unit Diagnostic Guide

PCB Diagrams

Diagnosis and Solution

EEPROM Parameter Error (E0/F4)

Diagnosis and solution for EEPROM parameter errors.

Indoor and Outdoor Unit Communication Error (E1)

Diagnosis and solution for communication errors between units.

Test the DC Voltage

Procedure to test DC voltage for troubleshooting.

Test the Reactor Resistance

Procedure to test reactor resistance for troubleshooting.

Zero Crossing Detection Error Diagnosis and Solution (E2)

Diagnosis and solution for zero-crossing detection errors.

The indoor fan speed is operating outside of the normal range (E3/F5)

Troubleshooting for indoor fan speed issues.

Indoor or Outdoor DC Fan Motor (control chip is in fan motor)

Troubleshooting for DC fan motor issues.

Outdoor DC Fan Motor (control chip is in the outdoor PCB)

Troubleshooting for outdoor DC fan motor.

Indoor AC Fan Motor

Troubleshooting for indoor AC fan motor.

Open circuit or short circuit of temperature sensor diagnosis and solution (E4/E5/F1/F2/F3)

Troubleshooting for temperature sensor faults.

Refrigerant Leakage Detection diagnosis and solution (EC)

Diagnosis and solution for refrigerant leakage detection.

Overload current protection diagnosis and solution (F0)

Troubleshooting for overload current protection.

IPM malfunction or IGBT over-strong current protection diagnosis and solution (P0)

Troubleshooting for IPM or IGBT over-current protection.

Over voltage or too low voltage protection diagnosis and solution (P1)

Troubleshooting for over/under voltage protection.

High temperature protection of compressor top diagnosis and solution (P2)

Troubleshooting for compressor top high-temperature protection.

Inverter compressor drive error diagnosis and solution (P4)

Troubleshooting for inverter compressor drive errors.

Main Parts Check

Guide for checking main components like sensors and windings.

Diagnosis and Solution

Temperature Sensor Checking

Procedure to check temperature sensor resistance.

Compressor Checking

Procedure to check compressor winding resistance.

IPM Continuity Check

Procedure to check IPM continuity.

Fan Motor

Procedure to measure fan motor winding resistance.

Pressure on the Service Port

Disassembly Instructions Sizes 9K (115V) - 18K (208/230V)

Disassembly Instructions Size 24K

Appendix

Temperature Sensor Resistance Value Table for T1, T2, T3, T4 (°C--K)

Table of resistance values for temperature sensors T1, T2, T3, T4.

Temperature Sensor Resistance Value Table for T5 (° C- -K)

Table of resistance values for temperature sensor T5.