Carrier 38AUD 16 Series User Manual

1
38AU
Air Cooled Condensing Units
60 Hz
With Puron
R
(R---410A) Refrigerant
S i z e s 1 6 --- 2 5
Installation, Start---Up and
Service Instructions
CONTENTS
SAFETY CONSIDERATIONS 2....................
INSTALLATION GUIDELINES 2..................
Replacement/Retrofit — R--22 to Puron 2...........
INSTALLATION 11 - 22.........................
Jobsite Survey 11...............................
Step 1 -- Plan for Unit Location 11.................
Step 2 -- Complete Pre--Installation Checks 11........
Step3–PrepareUnitMounting Support 12..........
Step4–RigandMount the Unit 12................
Step5–CompleteRefrigerantPipingConnections 12...
Step6–InstallAccessories 17....................
Step7–CompleteElectricalConnections 18.........
PRE-START-UP 23...............................
System Check 23...............................
Turn On Crankcase Heater 23.....................
Preliminary Charge 23...........................
START--UP 23 - 31..............................
Preliminary Checks 23...........................
Start Unit 24...................................
OPERATING SEQUENCE 32......................
Indoor (Supply) Fan 32..........................
Cooling, Unit Without Economizer 32..............
Cooling, Unit With Economizer 32.................
Heating 32....................................
ROUTINE SYSTEM MAINTENANCE 33............
Quarterly Inspection (and 30 days after initial start) 33...
Seasonal Maintenance 33........................
SERVICE 33 - 44................................
Refrigeration System 33.........................
Compressor Oil 33..............................
Servicing Systems on Roofs with
Synthetic Materials 33...........................
Liquid Line Filter Drier 34.......................
Field Refrigerant Access Ports 34..................
Factory High--Flow Access Ports 34................
Comfort Alert Diagnostic Module 35...............
Compressor Protection 37........................
Crankcase Heater 37............................
Low--Pressure Switch 37.........................
High--Pressure Switch 37.........................
Outdoor Fans 37................................
Lubrication 37.................................
Coil Type Identification 42.......................
N O VAT I O N tCoil Cleaning and Maintenance 42.....
Repairing NOVATION Condenser Tube Leaks 42.....
Replacing NOVATION Condenser Coil 43...........
Routine Cleaning of Round-Tube Plate Fin
(RTPF) Coils 43................................
Fastener Torque Values 44........................
TROUBLESHOOTING 44 -- 45.....................
APPENDIX A
Air Conditioner & Heat Pump with Puron
R
—
Quick Reference Guide 46.........................
APPENDIX B
Wiring Diagram List 46...........................
APPENDIX C
Low Ambient Option — Factory Installed 47..........
START--UP CHECKLIST 55 -- 56...................

Carrier 38AUD 16 Series Specifications

General

Type	Ductless Mini-Split
Refrigerant	R-410A
Seasonal Energy Efficiency Ratio (SEER)	Up to 16
Heating Seasonal Performance Factor (HSPF)	Up to 9.0
Voltage	208/230V
Phase	1

Summary

Installation Guidelines

Replacement/Retrofit — R-22 to Puron®

Guideline for replacing R-22 systems with Puron R-410A, covering coil and piping.

Installation

Jobsite Survey

Pre-installation checks, including building codes, unit location, and obstructions.

Step 1 - Plan for Unit Location

Selecting unit location based on clearances, safety, and airflow requirements.

Step 2 - Complete Pre-Installation Checks

Verifying electrical characteristics, unpacking, and inspecting shipment.

Step 3 - Prepare Unit Mounting Support

Instructions for preparing the mounting slab or support.

Step 4 - Rig and Mount the Unit

Guidelines for safely rigging and mounting the unit.

Step 5 - Complete Refrigerant Piping Connections

Steps for connecting refrigerant piping, including safety and line sizing.

Pre-Start-Up

System Check

Verifying electrical, air handler, accessories, connections, and charge.

Turn On Crankcase Heater

Procedure to energize the crankcase heater 24 hours before start-up.

Preliminary Charge

Adding initial refrigerant charge before compressor start-up.

Start-Up

Preliminary Checks

Final checks before unit start-up, including power, heater, leaks, and wiring.

Compressor Rotation

Procedure to verify correct compressor rotation for 3-phase units.

Operating Sequence

Indoor (Supply) Fan

Operation of the indoor fan based on thermostat settings (Continuous/Automatic).

Cooling, Unit Without Economizer

Sequence of operation for cooling without an economizer for 38AUZ/38AUD.

All Units

General operating sequence for all units regarding safety switches and CADM.

Routine System Maintenance

Quarterly Inspection (and 30 days after initial start)

Maintenance checks for the indoor section performed quarterly.

Seasonal Maintenance

Maintenance checks for air conditioning, heating, and economizer.

Service

Refrigeration System

Precautions for servicing Puron® refrigerant systems.

Compressor Oil

Information on POE oil, its hygroscopic nature, and handling precautions.

Servicing Systems on Roofs With Synthetic Materials

Precautions to protect roofing materials from POE oil exposure.

Synthetic Roof Precautionary Procedure

Step-by-step procedure for servicing units on synthetic roofs.

Service

Liquid Line Filter Drier

Replacement procedure for liquid line filter driers.

Field Refrigerant Access Ports

Using access ports for pressure readings, nitrogen, evacuation, and charging.

Factory High-Flow Access Ports

Description and use of high-flow access ports on suction and liquid lines.

Service

Comfort Alert Diagnostic Module

Description of CADM, its inputs, LEDs, and troubleshooting.

Service

Compressor Protection

Explanation of Compressor Overtemperature Protection (IP) and Crankcase Heater.

Low-Pressure Switch

Description of the low-pressure switch.

High-Pressure Switch

Description of the high-pressure switch.

Outdoor Fans

Procedure for adjusting outdoor fan height.

Lubrication

Information on fan motor lubrication and compressor oil supply.

Troubleshooting

COMPRESSOR DOES NOT RUN

Troubleshooting steps for compressor not running, with contactor open or closed.

COMPRESSOR STOPS ON HIGH-PRESSURE SWITCH

Troubleshooting for compressor shutdown due to high-pressure switch activation.

COMPRESSOR CYCLES ON LOW-PRESSURE SWITCH

Troubleshooting for compressor cycling on the low-pressure switch.

COMPRESSOR RUNNING BUT COOLING INSUFFICIENT

Troubleshooting for insufficient cooling when compressor is running.

UNIT OPERATES TOO LONG OR CONTINUOUSLY

Troubleshooting for units operating for excessive periods.

SYSTEM IS NOISY

Troubleshooting for noisy system operation.

COMPRESSOR LOSES OIL

Troubleshooting steps for compressor oil loss.

FROSTED SUCTION LINE

Troubleshooting for frosted suction lines.

HOT LIQUID LINE

Troubleshooting for hot liquid lines.

FROSTED LIQUID LINE

Troubleshooting for frosted liquid lines.

Appendices

APPENDIX A Air Conditioner & Heat Pump with PURON® — Quick Reference Guide

Quick reference guide for Puron® (R-410A) refrigerant systems.

APPENDIX B Wiring Diagram List

List of available wiring diagrams for different unit models and voltages.

APPENDIX C Low Ambient Option — Factory Installed

Details on the factory-installed low ambient option and its components.