Carrier 38MURAQ48AA3 User Manual

Specifications subject to change without notice.
Fig. 1 —Sizes 18K, 18K HH, 24K, 24K HH, 30K,
30K HH, 36K
Fig. 2 —Sizes 36K HH, 48K, 48K HH, 60K, 60K HH
NOTES: Read the entire instruction manual before starting the
installation. Images are for illustration purposes only.
Actual models may differ slightly. HH Denotes High Heat
Models.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS........................................................2
MODEL NUMBER AND ACCESSORIES.....................................3
DIMENSIONS..................................................................................4
CLEARANCES ................................................................................8
INSTALLATION REQUIREMENTS .............................................9
INSTALLATION .............................................................................9
Step 1 - Check Equipment ................................................................9
Step 2 - Mount Unit ..........................................................................9
Step 3 - Condensate Drain Installation .............................................10
Step 4 - Operating Ambient..............................................................10
Step 5 - Refrigerant Piping Connections ..........................................10
Step 6 - Electrical Connections - Dip Switch Configuration............13
Step 7 - Evacuate Coil And Tubing System .....................................15
ELECTRICAL DATA......................................................................16
24V CONNECTION DIAGRAMS ..................................................16
START-UP .......................................................................................18
CARE AND MAINTENANCE........................................................18
TROUBLESHOOTING ...................................................................18
OUTDOOR UNIT DIAGNOSTIC GUIDES ...................................19
CROSSOVER SOLUTIONS............................................................20
Installation Instruction
38MURA
Residential Single Zone Heat Pump System
Sizes 18 to 60

Carrier 38MURAQ48AA3 Specifications

General

Model Number	38MURAQ48AA3
Category	Heat Pump
Brand	Carrier
Cooling Capacity (BTU/h)	48000
Voltage (V)	208/230
Phase	1
Refrigerant	R-410A
Compressor Type	Inverter
Heating Capacity (BTU/h)	48000
Operating Temperature Range (Cooling)	14°F to 122°F
Outdoor Unit Weight	132 lbs

Summary

Safety and Hazard Information

Electrical, Explosion, and Equipment Damage Hazards

Covers warnings for electrical shock, explosion, and equipment damage risks.

Installation Clearances

Minimum Unit Clearance Dimensions

Installation Requirements and Warnings

Product Installation Requirements and Warnings

Crucial warnings and requirements for proper product installation.

Installation Procedures

Step 2 - Unit Mounting

Guidance on selecting location and securely mounting the outdoor unit.

Refrigerant Piping Installation

Refrigerant Handling and Piping Safety

Warnings on refrigerant safety, piping practices, and contamination prevention.

Pipe Cutting, Deburring, and Flaring

Detailed steps for pipe preparation to ensure proper connections.

Refrigerant Line Pressure Testing

Pressure Test Procedure and Caution

Steps for pressure testing using Dry Nitrogen and associated safety cautions.

Electrical Connections and Dip Switch Setup

Outdoor Unit Wiring and Connection

Steps for installing power and communication wiring to the outdoor unit.

Wiring and Conduit Fitting Cautions

Electrical Wiring and Communication Setup

Power Wiring Procedures

Steps for connecting power wiring to the outdoor unit terminals.

Communication Wiring Options

System Evacuation Procedures

System Evacuation Methods Explained

Explains deep vacuum and triple evacuation methods for system evacuation.

Deep Vacuum Graph and Triple Evacuation Steps

Electrical Specifications and 24V Connections

Electrical Data Specifications

Provides MCA, MOCP, voltage, and power consumption data for cooling and heating.

Thermostat Wiring and Dip Switch Configurations

Common Thermostat Wiring Configurations

Start-Up and Testing Procedures

Test Operation and System Checks

Care and Maintenance Guidelines

Periodic Maintenance Guidelines

Troubleshooting and Diagnostics

Diagnostic Code Interpretation

Outdoor Unit Diagnostic Error Codes

Outdoor Unit Error Code Reference

Table listing error codes and their corresponding information for outdoor units.