Carrier 38AUZ Series User Manual

38AUZD/E
Air Cooled Condensing Units, 60 Hz
Single Circuit, 2---Stage with Digital Scroll Compressor
and Puron
R
(R ---410A) Refrigerant
Size 08
Installation, Start---Up
and Service Instructions
TABLE OF CONTENTS
SAFETY CONSIDERATIONS 2....................
Rated Indoor Airflow (cfm) 3.....................
Matching 38AUZD/E08 Model to Evaporator Coil 6...
INSTALLATION 6--16...........................
Jobsite Survey 6................................
Step 1 -- Plan for Unit Location 6..................
Step 2 -- Complete Pre--Installation Checks 6.........
Step 3 -- Prepare Unit Mounting Support 6...........
Step 4 -- Rig and Mount the Unit 6.................
Step 5 -- Determine Refrigerant Line Sizes 7.........
Step 6 -- Complete Refrigerant Piping Connections 8....
Step 7 -- Install Accessories 10....................
Step 8 -- Complete Electrical Connections 10.........
Step 9 -- Wind Baffles for Low Ambient Controls 16...
PRE-START-UP 16...............................
System Check 16...............................
Turn On Crankcase Heater 16.....................
Preliminary Charge 16...........................
START--UP 16 -- 19..............................
Preliminary Checks 16...........................
Start Unit 17...................................
OPERATING SEQUENCE 20......................
Base Unit Controls 20...........................
Indoor (Supply) Fan 20..........................
Cooling, Unit Without Economizer 20..............
Cooling, Unit with Economizer 20.................
Heating 20....................................
ROUTINE SYSTEM MAINTENANCE 20............
Quar ter ly Insp ection (and 30 day s after initial start) 20...
Seasonal Maintenance 20........................
SERVICE 21 -- 27................................
Refrigeration System 21.........................
Compressor Oil 21..............................
Servicing Systems on Roofs with
Synthetic Materials 21...........................
Liquid Line Filter Drier 21.......................
Filed Refrigerant Access Ports 21..................
Factory High-- Flow Access Ports 21................
Comfort Alert Diagnosti c Module 22...............
Compressor Protection 24........................
Crankcase Heater 24............................
Low--Pressure Switch 24.........................
High--Pressure Switch 24.........................
Outdoor Fans 24................................
Lubrication 24.................................
Routine Cleaning of Round-Tube Plate Fin
(RTPF) Coils 26................................
Fastener Torque Values 27........................
TROUBLESHOOTING 27 -- 28.....................
APPENDIX A
Air Conditioner & Heat Pump with Puron
R
—
Quick Reference Guide 29.........................
APPENDIX B
Wiring Diagram List 29...........................
APPENDIX C
Low Ambient Option — Factory Installed 29..........
START--UP CHECKLIST 35 -- 36...................

Carrier 38AUZ Series Specifications

General

Brand	Carrier
Model	38AUZ Series
Category	Heat Pump
Language	English

Summary

SAFETY CONSIDERATIONS

Electrical Shock Hazard

Warning about electrical shock during service operations.

Unit Operation and Safety Hazards

Warning regarding refrigerant pressure and R-22 components.

Personal Injury and Environmental Hazards

Warning on refrigerant handling, disposal, and safety.

Cut Hazard

Caution about sharp edges on sheet metal parts.

INSTALLATION

Jobsite Survey

Pre-installation checks including codes and obstructions.

Plan Unit Location

Selecting location, clearances, and airflow considerations.

Pre-Installation Checks

Unit un-crating, shipment inspection, electrical checks.

Prepare Mounting Support

Installing concrete slab or support for the unit.

Rig and Mount Unit

Procedures for lifting and securing the unit.

Determine Refrigerant Line Sizes

Selecting appropriate refrigerant line sizes based on length.

Complete Refrigerant Piping Connections

Connecting refrigerant piping and ensuring safety.

Install Liquid Line Solenoid Valve

Recommends solenoid valve for migration prevention.

Make Piping Connections

Details connecting field tubing to unit service valves.

Evacuation and Dehydration

Procedures for evacuating the system to 500 microns.

Install Accessories

Installing optional accessories like winter start controls.

Complete Electrical Connections

Wiring unit according to NEC and local codes.

Field Power Supply

Connecting power supply to the unit's terminals.

Factory-Installed Non-Fused Disconnect

Installing the handle and shaft for NFD.

Units Without Factory-Installed Disconnect

Requirements for disconnect switch installation.

Convenience Outlets

Information on non-powered and unit-powered outlets.

Unit-Powered Convenience Outlet

Details on the unit-mounted transformer outlet.

Field Control Wiring

Thermostat Installation

Installing and selecting a thermostat for the unit.

CHECK VOLTAGE IMBALANCE

PRE-START-UP

System Checks

Verifying electrical, air handler, and piping integrity.

Crankcase Heater Activation

Energizing crankcase heater for 24 hours before start.

Preliminary Refrigerant Charge

Adding initial refrigerant charge to the system.

START-UP

Compressor Overload Protection

Information on compressor overload protection and reset.

Advanced Scroll Temperature Protection (ASTP)

Details on ASTP and its reset procedures.

ROUTINE SYSTEM MAINTENANCE

Quarterly Inspection

Checks for indoor section components every 1-2 months.

Seasonal Maintenance

Checks for AC and heating components at season start.

SERVICE

Equipment Damage Hazard

Warnings about using Puron refrigerant and correct equipment.

Compressor Oil Handling

Precautions for hygroscopic POE oil.

Synthetic Roof Precautions

Protecting roofing materials from oil exposure.

Liquid Line Filter Drier

Specifications and replacement of filter driers.

Field Refrigerant Access Ports

Location and use of access ports for service.

Comfort Alert Diagnostic Module (CADM)

Compressor Protection

Crankcase Heater Operation

Heater function and importance of continuous operation.

Low and High-Pressure Switches

Description and function of pressure switches.

Outdoor Fan Assembly

Adjusting fan height and motor lubrication.

Compressor Lubrication

Compressor oil supply and when to add oil.

Coil Cleaning Procedures

Totaline Coil Cleaner Application

Equipment and steps for using environmentally sound cleaner.

TROUBLESHOOTING

Compressor Operation Issues

Diagnosing issues like not running or stopping.

System Performance Troubleshooting

Diagnosing airflow, refrigerant, and electrical issues.

APPENDIX A - Quick Reference Guide

APPENDIX B - Wiring Diagram List

APPENDIX C - Low Ambient Option

START-UP CHECKLIST