Carrier Infinity 50DT Series - User Manual

Turn to the Expertg
Installation Instructions
IMPORTANT: OAT sensor must be field installed. See
Accessory Installation for more details.
IMPORTANT: This Infinity _ unit is designed for use with an
Infinity User Interface.
NOTE: Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
Page
SAFETY CONSIDERATIONS ........................ 2
INTRODUCTION .................................. 2
RECEIVING AND INSTALLATION ................ 2-10
Check Equipment ................................. 2
Identify Unit ................................... 2
Inspect Shipment ................................ 2
Provide Unit Support .............................. 2
Roof Curb ..................................... 2
Slab Mount .................................... 2
Ground Mount ................................. 2
Provide Clearances ................................ 6
Rig and Place Unit ................................ 6
Inspection ..................................... 6
Introduction .................................... 6
Use of Rigging Bracket ........................... 6
Select and Install Ductwork .......................... 7
Converting Horizontal Discharge Units to Downflow
(Vertical) Discharge Units ......................... 8
Provide for Condensate Disposal ..................... 8
Install Electrical Connections ........................ 8
High-Voltage Connections ........................ 8
Routing Power Leads Into Unit .................... 10
Connecting Ground Lead to Ground Screw .......... 10
Routing Control Power Wires .................... 10
Accessory Installation ........................... 10
Special Procedures for 208-v Operation ............. 10
PRE-START-UP .................................. 12
START-UP .................................... 12-21
Unit Start-Up ................................ 12-16
Sequence of Operation ......................... 16-19
Check for Refrigerant Leaks ........................ 19
Start-Up Adjustments ............................. 19
Checking Cooling and Heating Control Operation ..... 19
Checking and Adjusting Refrigerant Charge .......... 19
Refrigerant Charge ............................. 19
No Charge .................................... 19
Low Charge Cooling ............................ 19
To Use Cooling Charging Charts ................... 19
Indoor Airflow and Airflow Adjustments ............ 19
Non-Communicating Emergency Cooling/Heating Mode . 19
Fig. 1 - Unit 50DT
C99001
MAINTENANCE ............................... 21-24
Air Filter ....................................... 22
Indoor Fan and Motor ............................. 22
Outdoor Coil. Indoor Coil, and Condensate Drain Pan .... 22
Outdoor Fan .................................... 22
Electrical Controls and Wiring ...................... 22
Refrigerant Circuit ................................ 22
Indoor Airflow . ................................. 22
Metering Devices-TXV & AccuRater Piston .......... 23
Pressure Switches ................................ 23
Loss-of-Charge Switch ........................... 23
High-Pressure Switches ........................... 23
Copeland Scroll Compressor (Puron ®:Refrigerant) ....... 23
Refrigerant System ............................... 23
Refrigerant ................................... 23
Compressor Oil ................................ 23
Servicing Systems on Roofs with Synthetic Materials ... 23
Liquid-Line Filter Drier ......................... 23
Puron (R-410A) Refrigerant Charging .............. 23
TROUBLESHOOTING ............................. 24
FINAL CHECKS .................................. 25
CARE AND MAINTENANCE ....................... 25
START-UP CHECKLIST ........................... 29

Carrier Infinity 50DT Series Specifications