Carrier 50EZ-A Installation Instructions Manual

Installation Instructions
to the expe_
NOTE: Read the entire instruction manual before starting the
installation.
NOTE: Installer: Make sure the Owner's Manual and Service
Instructions are left with the unit after installation.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS ....................... 1-2
INTRODUCTION ................................... 2
RECEIVING AND INSTALLATION .................. 2-9
Check Equipment .................................. 2
Identify Unit .................................... 2
Inspect Shipment ................................. 2
Provide Unit Support ............................... 2
Roof Curb ...................................... 2
Slab Mount ..................................... 2
Provide Clearances ................................. 2
Rig and Place Unit ................................. 3
Inspection ...................................... 3
Rigging/Lifting of Unit ............................ 7
Select and Install Ductwork ........................... 7
Converting Horizontal Discharge Units to Downflow
(Vertical) Discharge Units .......................... 8
Provide for Condensate Disposal ...................... 9
Install Electrical Connections ......................... 9
High-Voltage Connections ......................... 9
Special Procedures for 208-V Operation .............. 10
Control Voltage Connections ....................... 10
Standard Connections ............................ 10
Transformer Protection ........................... 10
Accessory Electric heaters Installation ................ 10
PRE-START-UP ................................... 18
START-UP ..................................... 18-24
Checking Cooling & Heating Control Operation ........ 18
Check for Refrigerant Leaks ......................... 18
Start-Up Adjustments ............................. 18
50EZ-A Sequence of Operation .................... 19
Checking & Adjusting Refrigerant Charge ............ 19
Indoor Airflow & Airflow Adjustments .............. 19
Continuous Fan Operation ........................ 20
Defrost Control ................................... 24
Quiet Shift ..................................... 24
Defrost ....................................... 24
MAINTENANCE .................................. 24-
Air Filter ........................................ 24
Indoor Blower and Motor ........................... 24
Outdoor Coil, Indoor Coil, & Condensate Drain Pan ...... 25
Outdoor Fan ..................................... 25
Electrical Controls and Wiring ....................... 27
Refrigerant Circuit ................................. 27
Indoor Airflow ................................... 28
Metering Devices- TXV & Piston .................... 28
Pressure Switches ................................. 28
Loss of Charge Switch ............................. 28
High Pressure Switch .............................. 28
Copeland Scroll compressor (Puron Refrigerant) ......... 28
A09034
Fig. 1 - Unit 50EZ-A
Refrigerant System ................................ 28
Refrigerant .................................... 28
Compressor Oil ................................. 28
Servicing Systems on Roofs with Synthetic Materials .... 28
Liquid Line Filter Drier ........................... 29
Puron® (R-410A) Refrigerant Charging ............. 29
System Information ................................ 29
Loss of Charge Switch ............................ 29
Check Defrost Thermostat ......................... 29
TROUBLESHOOTING .............................. 29
START-UP CHECKLIST ............................ 29
SAFETY CONSIDERATIONS
Installation and servicing of this equipment can be hazardous due
to mechanical and electrical components. Only trained and
qualified personnel should install, repair, or service this equipment.
Untrained personnel can perform basic maintenance functions such
as cleaning and replacing air filters. All other operations must be
performed by trained service personnel. When working on this
equipment, observe precautions in the literature, on tags, and on
labels attached to or shipped with the unit and other safety
precautions that may apply.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have a fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions included in
literature and attached to the unit. Consult local building codes, the
current editions of the National Electrical Code (NEC) NFPA 70.
In Canada refer to the current editions of the Canadian electrical
Code CSA C22.1.
Recognize safety information. This is the safety-alert symbol Z_.
When you see this symbol on the unit and in instructions or manu-
als, be alert to the potential for personal iniury. Understand these
signal words: DANGER, WARNING, and CAUTION. These
words are used with the safety-alert symbol. DANGER identifies
the most serious hazards which will result in severe personal iniury