Carrier 50ZH024-060 instruction manual Table of Contents, Safety Considerations

50ZH024-060 Packaged Heat Pump Units

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Installation, Start-Up and Service Instructions

NOTE: Read the entire instruction manual before starting the installation.

TABLE OF CONTENTS
SAFETY CONSIDERATIONS	1
INTRODUCTION	2
RECEIVING AND INSTALLATION	2
Check Equipment	2
IDENTIFY UNIT	2
INSPECT SHIPMENT	2
Provide Unit Support	2
SLAB MOUNT	2
GROUND MOUNT	2
Provide Clearances	2
Place Unit	2
Select and Install Ductwork	2
INSTALL FLANGES FOR DUCTWORK CONNEC-
TIONS (50ZH060 ONLY)	6
CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE	6
Provide for Condensate Disposal	6
Install Electrical Connections	7
HIGH-VOLTAGE CONNECTIONS	7
ROUTING POWER LEADS INTO UNIT	8
CONNECTING GROUND LEAD TO UNIT
GROUND	8
ROUTING CONTROL POWER WIRES	8
ACCESSORY ELECTRIC HEAT WIRING	8
SPECIAL PROCEDURES FOR 208-V OPERATION	8
PRE-START-UP	9
START-UP	9
Check for Refrigerant Leaks	10
LOCATE AND REPAIR REFRIGERANT LEAKS AND
CHARGE THE UNIT AS FOLLOWS:	10
Start-Up Cooling Section and Make Adjustments	10
CHECKING COOLING CONTROL OPERATION	10
COMPRESSOR ROTATION	10
Refrigerant Charge	10
NO CHARGE	10
LOW CHARGE COOLING	10
TO USE THE COOLING CHARGING CHART	10
HEATING MODE CHARGE	11
Indoor Airflow and Airflow Adjustments	11
FOR 208/230-V	12
FOR 460-V MOTORS	12
Unit Controls	12
HIGH-PRESSURE RELIEF VALVE	12
LOSS OF CHARGE SWITCH	12
COMPRESSOR OVERLOAD	12
Sequence of Operation	12
FAN OPERATION	12
COOLING	14
HEAT PUMP HEATING	14

DEFROST	15
ELECTRIC RESISTANCE HEATING	15
MAINTENANCE	15
Air Filter	16
Unit Top Removal (Outdoor-Coil Side)	16
Indoor Blower and Motor	16
Outdoor Coil, Indoor Coil, and Condensate Drain Pan	16
Outdoor Fan	17
Electrical Controls and Wiring	18
Refrigerant Circuit	18
Indoor Airflow	18
Metering Devices	18
Lubrication	18
Liquid Line Strainer	18
High Flow Valves	19
TROUBLESHOOTING	22
START-UP CHECKLIST	23

NOTE TO INSTALLERÐBefore installation, READ THESE INSTRUCTIONS CAREFULLY AND COMPLETELY. Also, make sure the User's Manual and Replacement Guide are left with the unit after installation.

C00155

Fig. 1ÐUnit 50ZH

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified workers should install, repair, or service air-conditioning equipment.

Untrained workers can perform basic maintenance functions of cleaning coils and filters. All other operations should be performed by trained service people. When working on air-conditioning

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book	1	4	PC 101	Catalog No. 535-00080	Printed in U.S.A.	Form 50ZH-5SI	Pg 1	7-03	Replaces: 50ZH-4SI
Tab	6	8