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
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