Installation Instructions
NOTE: Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS ......................... 2
INTRODUCTION ................................... 2
RECEIVING AND INSTALLATION .................. 2-7
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
Configuring Units for Downflow (Vertical) Discharge .... 3
Connect Condensate Drain ........................... 3
Install Electrical Connections ......................... 6
High-Voltage Connections ......................... 6
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 .................................... 7
START-UP ...................................... 8-17
Check for Refrigerant Leaks .......................... 8
Start-Up Cooling and Make Adjustments ................ 8
Checking Cooling and Heating Control Operation ....... 8
Refrigerant Charge ................................. 8
No Charge ...................................... 8
Low Charge Cooling .............................. 8
Heating Mode Charge ............................. 8
Indoor Airflow and Airflow Adjustments ................ 9
Unit Controls ..................................... 9
High-Pressure Relief Valve ......................... 9
Loss-of-Charge Switch ........................... 9
Compressor Overload ............................ 10
Compressor Rotation ............................... 10
Sequence of Operation ............................. 10
Fan Operation .................................. 10
A05194
Fig. 1 - Unit PH3Z
Cooling Operation ............................ 10, 17
Heating Operation ............................... 17
Continuous Fan ................................. 17
Defrost ....................................... 17
Electric Resistance Heating ........................ 17
MAINTENANCE ................................ 17-20
Air Filter ........................................ 18
Unit Top Removal ................................. 18
Indoor Blower and Motor ........................... 18
Outdoor Coil, Indoor Coil, and Condensate Drain Pan ..... 19
Outdoor Fan ..................................... 19
Electrical Controls and Wiring ....................... 19
Refrigerant Circuit ................................. 20
Indoor Airflow ................................... 20
Metering Devices ................................. 20
Liquid Line Strainers ............................... 20
High Flow Valves ................................. 20
TROUBLESHOOTING .............................. 20
START-UP CHECKLIST ............................ 20
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