Carrier 50ZHA024-060 instruction manual Unit50ZHA, Table Of Contents, Safety Considerations

50ZHA024-060 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
CONVERTING HORIZONTAL DISCHARGE
UNITS TO DOWNFLOW (VERTICAL) DIS-
CHARGE	4
Provide for Condensate Disposal	4
Install Electrical Connections	5
HIGH-VOLTAGE CONNECTIONS	5
ROUTING POWER LEADS INTO UNIT	6
CONNECTING GROUND LEAD TO UNIT GROUND .6
ROUTING CONTROL POWER WIRES	6
ACCESSORY ELECTRIC HEAT WIRING	6
PRE-START-UP	6
START-UP	7
Check for Refrigerant Leaks	8
LOCATE AND REPAIR REFRIGERANT LEAKS AND
CHARGE THE UNIT AS FOLLOWS:	8
Start-Up Cooling Section and Make Adjustments	8
CHECKING COOLING CONTROL OPERATION	8
Refrigerant Charge	8
NO CHARGE	8
LOW CHARGE COOLING	9
HEATING MODE CHARGE	9
Indoor Airflow and Airflow Adjustments	9
FOR 208/230-V	13
Unit Controls	13
HIGH-PRESSURE RELIEF VALVE	13
LOSS OF CHARGE SWITCH	13
COMPRESSOR OVERLOAD	13
Sequence of Operation	13
FAN OPERATION	13
COOLING	14
HEATING	14
CONTINUOUS FAN	14
DEFROST	14
ELECTRIC RESISTANCE HEATING	14
MAINTENANCE	15
Air Filter	15
Unit Top Removal (Outdoor-Coil Side)	15

	A05194
Fig. 1—Unit 50ZHA
Indoor Blower and Motor	15
Outdoor Coil, Indoor Coil, and Condensate Drain Pan	16
Outdoor Fan	16
Electrical Controls and Wiring	16
Refrigerant Circuit	17
Indoor Airflow	17
Metering Devices	17
Lubrication	17
Liquid Line Strainer	17
High Flow Valves	17
TROUBLESHOOTING	17
START-UP CHECKLIST	17

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

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 equipment, pay attention to precautions in the literature, tags, and labels attached to the unit, and other safety precautions that may apply.

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	Printed in U.S.A.	Catalog No. 50ZHA-1SI	Pg 1	9-05	Replaces: New
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