Carrier 50XZ048 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 50XZ048 Specifications

General

SEER	Up to 16
Refrigerant Type	R-410A
Phase	1
Cooling Capacity	48000 BTU
Sound Level	72 dB
Heating Capacity	48000 BTU
Sound Level (Outdoor Unit)	72 dB
Voltage	208/230V

Summary

Safety Considerations

Introduction to Safety

Provides general safety information and hazard warnings relevant to the equipment.

Receiving and Installation Precautions

Covers unit identification, inspection for shipping damage, and proper support installation.

Unit Installation Procedures

Rigging, Placement, and Ductwork

Guidelines for safely rigging, lifting, positioning the unit, and installing ductwork.

Downflow Conversion and Condensate Disposal

Instructions for converting units to downflow and managing condensate drainage properly.

Electrical Connections and Configuration

Details on making electrical connections and configuring system settings like Easy Select™.

Sequence of Operation

System Operating Modes

Describes the sequence of operation for various modes like cooling, heating, and defrost.

Pre-Start-Up and Start-Up Procedures

Pre-Start-Up Inspections

Essential checks and inspections to prepare the unit for initial start-up.

Control, Refrigerant, and Airflow Checks

Verifying controls, refrigerant leaks, charge, and adjusting airflow and defrost settings.

Maintenance and Servicing

Routine Maintenance Tasks

Covers air filter inspection, blower/motor cleaning, and coil/drain pan cleaning.

Troubleshooting and Quick Guides

Troubleshooting Chart

A guide to diagnose and resolve common unit symptoms and issues.

Quick Reference Guides

Provides quick guides for Puron refrigerant, system setup, and blower motor configuration.

Start-Up Checklist

Checklist Sections

Comprehensive checklist covering preliminary info, pre-start-up, electrical, temperatures, and Easy Select settings.