to the expe_
Installation Instructions
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 ......................... 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 ........................... 3
Installing factory-supplied duct flanges ............... 3
Configuring Units for Downflow (Vertical) Discharge .... 7
Connect Condensate Drain ........................... 7
Install Electrical Connections ......................... 7
High-Voltage Connections ......................... 7
Routing Power Leads Into Unit ...................... 7
Connecting Ground Lead to Unit Ground .............. 8
Routing Control Power Wires ...................... 8
Accessory Electric Heat Wiring ...................... 8
PRE-START-UP .................................. 8-9
START-UP ...................................... 9-14
Check for Refrigerant Leaks .......................... 9
Start-Up Cooling and Make Adjustments ................ 9
Checking Cooling and Heating Control Operation ....... 9
Refrigerant Charge ................................ 11
No Charge ..................................... 11
Low Charge Cooling ............................. 11
Indoor Airflow and Airflow Adjustments ............... 11
Sequence of Operation ............................. 11
Fan Operation .................................. 11
Cooling Operation ............................... 11
Continuous Fan ................................. 14
Electric Resistance Heating ........................ 14
Indoor Blower and Motor ........................... 15
Fig. 1 - Unit 50ZPB
A05194
MAINTENANCE ................................ 15-18
Air Filter ........................................ 14
Unit Top Removal ................................. 15
Outdoor Coil, Indoor Coil, and Condensate Drain Pan ..... 15
Outdoor Fan Adjustment ............................ 16
Electrical Controls and Wiring ....................... 16
Refrigerant Circuit ................................. 17
Indoor Airflow ................................... 17
Metering Devices ................................. 17
High Flow Valves ................................. 17
High Pressure Switch .............................. 17
Puron® (R-410A) Compressor ...................... 17
Refrigerant ...................................... 17
Compressor Oil ................................... 17
Servicing Systems on Roof with Synthetic Materials ...... 18
Synthetic Roof Precautionary Procedure ................ 18
Liquid Line Filter Drier ............................. 18
Puron (R-410A) Refrigerant Charging ................. 18
TROUBLESHOOTING .............................. 18
START-UP CHECKLIST ............................ 18
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