Carrier 50XZ024 User Manual

50XZ 024–060
Single-Packaged Heat Pump Units
with Puron® (R-410A) Refrigerant
Installation, Start-Up,
and Service Instructions
NOTE: Read the entire instruction manual before starting the
installation.
This symbol → indicates a change since the last issue.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS.....................................................2
Introduction ....................................................................................2
Receiving and Installation..............................................................2
Check Equipment......................................................................2
IDENTIFY UNIT ................................................................2
INSPECT SHIPMENT........................................................2
Provide Unit Support................................................................2
ROOF CURB.......................................................................2
SLAB MOUNT ...................................................................2
GROUND MOUNT ............................................................2
Provide Clearances....................................................................2
Rig and Place Unit....................................................................3
INSPECTION ......................................................................3
INSTALLATION ................................................................4
Select and Install Ductwork .....................................................5
CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE UNITS.........7
Provide for Condensate Disposal.............................................7
Install Electrical Connections...................................................8
HIGH-VOLTAGE CONNECTIONS..................................8
ROUTING POWER LEADS INTO UNIT ........................9
CONNECTING GROUND LEAD TO GROUND LUG ..9
ROUTING CONTROL POWER WIRES (24-V)..............9
Easy Select™—50XZ .........................................................9
50XZ Sequence Of Operation...........................................17
SPECIAL PROCEDURES FOR 208-V OPERATION ...17
PRE-START-UP ..........................................................................18
START-UP...................................................................................18
50XZ: Start-Up .......................................................................18
Check for Refrigerant Leaks ..................................................19
Start-Up Adjustments..............................................................19
CHECKING COOLING AND HEATING CONTROL OP-
ERATION..........................................................................19
CHECKING AND ADJUSTING REFRIGERANT
CHARGE...........................................................................19
REFRIGERANT CHARGE ..............................................20
NO CHARGE....................................................................20
LOW CHARGE COOLING .............................................20
TO USE COOLING CHARGING CHARTS ..................20
INDOOR AIRFLOW AND AIRFLOW ADJUST-
MENTS..............................................................................20
Defrost Control .......................................................................20
Quiet Shift..........................................................................20
Defrost................................................................................20
MAINTENANCE.........................................................................22
Air Filter..................................................................................23
Indoor Blower and Motor.......................................................23
Outdoor Coil, Indoor Coil, and Condensate Drain Pan ........23
Outdoor Fan ............................................................................24
Electrical Controls and Wiring...............................................24
Refrigerant Circuit ..................................................................24
Indoor Airflow ........................................................................24
Metering Devices–TXV & Accurater Piston.........................24
Pressure Switches....................................................................25
Loss of Charge Switch ...........................................................25
High-Pressure Switch..............................................................25
Copeland Scroll Compressor (Puron Refrigerant).................26
Refrigerant System..................................................................26
Refrigerant .........................................................................26
Compressor Oil..................................................................26
Servicing Systems on Roofs with Synthetic Materials....26
Liquid Line Filter Drier ....................................................26
Puron (R-410A) Refrigerant Charging .............................26
System Information.................................................................26
Loss of Charge Switch......................................................26
Check Defrost Thermostat ................................................26
TROUBLESHOOTING ...............................................................27
Start-Up Checklist........................................................................27
NOTE TO INSTALLER — READ THESE INSTRUCTIONS
CAREFULLY AND COMPLETELY before installing this unit.
Also, make sure the Owner’s Manual and Service Instructions are
left with the unit after installation.
Fig. 1—Unit 50XZ
C99064
Visit www.carrier.com
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 5a 5a
PC101CatalogNo.535–00114 PrintedinU.S.A.Form50XZ-2SIPg18–03Replaces:50XZ-1SI

Carrier 50XZ024 Specifications

General

Brand	Carrier
Model	50XZ024
Category	Heat Pump
Language	English

Summary

Safety Considerations

General Safety Precautions

Covers safety-alert symbols, signal words (DANGER, WARNING, CAUTION, NOTE), and general safety practices.

Electrical Safety Guidelines

Details electrical supply requirements, grounding, and warnings about electrical shock during service.

Refrigerant System Safety

Highlights precautions for Puron (R-410A) systems, including pressure and equipment compatibility.

Unit Receiving and Installation

Unit Identification and Inspection

Instructions for checking equipment, identifying the unit, and inspecting for shipping damage.

Unit Support and Placement

Guidelines for providing proper unit support, including roof curb, slab, and ground mounting.

Clearance Requirements

Details required minimum service clearances for ventilation and unit operation.

Rigging and Lifting Procedures

Safe procedures for rigging and lifting the unit, emphasizing trained personnel and proper equipment.

Installation Steps

Ductwork Selection and Installation

Guidance on selecting, sizing, and installing ductwork for optimal airflow and performance.

Unit Configuration Conversion

Instructions for converting horizontal discharge units to downflow (vertical) discharge configurations.

Condensate Disposal System

Procedures for properly draining condensate water from the unit to prevent overflow.

Electrical Wiring and Connections

Details on making high-voltage and low-voltage electrical connections according to codes.

Power and Control Wire Routing

Instructions for routing high-voltage power leads and low-voltage control wires into the unit.

System Configuration

Easy Select™ Configuration Taps

Explanation of Easy Select™ taps for configuring system parameters like heat, airflow, and delay.

Thermidistat™ Control Settings

Guidance on setting Thermidistat™ controls for optimal comfort, including Super Dehumidify and heat settings.

Start-Up and Operation Checks

Pre-Start-Up Inspection Checklist

Checklist for preparing the unit before initial start-up, including safety and component checks.

Control Operation Verification

Steps to check cooling and heating control operation, including thermostat and system modes.

Refrigerant Charge Adjustment

Procedures for checking and adjusting the refrigerant charge using charging charts.

Indoor Airflow Adjustments

Methods for adjusting indoor airflow using Easy Select™ settings for optimal performance.

Defrost Control Configuration

Details on setting defrost controls, including Quiet Shift and defrost interval timing.

Maintenance and Troubleshooting

Routine Maintenance Tasks

Recommended maintenance schedule including air filter inspection, coil cleaning, and drain pan checks.

Troubleshooting Common Issues

Guidance on diagnosing and resolving common operational problems using charts and checks.

Component-Specific Checks

Detailed checks for outdoor fan, electrical controls, refrigerant circuit, and pressure switches.

Copeland Scroll Compressor Details

Information specific to the Copeland scroll compressor, including oil and safety precautions.