turn to the expe_
Installation Instructions
NOTE: Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS ......................... 1
INTRODUCTION ................................... 5
RECEIVING AND INSTALLATION .................. 5-9
Check Equipment .................................. 5
Identify Unit .................................... 5
Inspect Shipment ................................. 5
Provide Unit Support ............................... 5
Slab Mount ..................................... 5
Ground Mount .................................. 5
Provide Clearances ................................. 5
Place Unit ........................................ 5
Select and Install Ductwork ........................... 5
Install Flanges for Ductwork Connections (50ZH060 only) 5
Converting Horizontal Discharge Units to Downflow (Vertical)
Discharge ...................................... 6
Provide for Condensate Disposal .................... 6-8
Install Electrical Connections ......................... 8
High Voltage Connections .......................... 8
Routing Power Leads into Unit ...................... 8
Connecting Ground Lead to Unit Ground .............. 8
Routing Control Power Wires ....................... 9
Special Procedures for 208-V Operation ............... 9
PRE-START-UP .................................... 9
START-UP ..................................... 11-13
Check for Refrigerant Leaks ......................... 11
Start-Up Cooling Section and Marke Adjustments ........ 11
Check Cooling Control Operation ................... 11
Compressor Rotation ............................. 11
Refrigerant Charge ................................ 11
No Charge ..................................... 11
Low Charge Cooling ............................. 11
To Use Cooling Charging Charts .................... 11
Heating Mode Charge ............................ 11
Indoor Airflow and Airflow Adjustments ............... 11
Unit Controls .................................... 13
High-Pressure Relief Valve ........................ 13
Loss of Charge Switch ............................ 13
Compressor Overload ............................ 13
Sequence of Operation ............................. 13
Fan Operation .................................. 13
Cooling ....................................... 13
Heat Pump Heating .............................. 13
Defrost ....................................... 13
MAINTENANCE ................................ 14-18
Air Filter ........................................ 14
Unit Top Removal (Condenser Coil Side) ............... 14
Evaporator Blower and Motor ........................ 14
Condenser Coil, Evaporator Coil, and Condensate Drain Pan 15
Condenser Fan ................................... 15
Electrical Controls and Wiring ....................... 15
C00001
Fig. 1 - 50ZH
Refrigerant Circuit ................................. 17
Evaporator 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 the installation, READ
THESE INSTRUCTIONS CAREFULLY AND COMPLETELY.
Also, make sure the User's Manual is left with the unit after
installation.
SAFETY CONSIDERATIONS
Improper installation adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, personal injury, or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory-authorized kits or accessories
when modifying this product Refer to the individual instructions
packaged with the kits or accessories when installing.
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
manuals, 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
or death. WARNING signifies hazards which could result in
personal iniury or death. CAUTION is used to identify unsafe
practices which may result in minor personal iniury or product and
property damage. NOTE is used to highlight suggestions which
will result in enhanced installation, reliability, or operation.
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