Carrier Infinity 48DT Series Installation Instructions Manual

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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 ................ 2-12
Check Equipment ................................. 2
Identify Unit ................................... 2
Inspect Shipment ................................ 2
Provide Unit Support .............................. 2
Roof Curb ..................................... 2
Slab Mount .................................... 2
Ground Mount ................................. 2
Provide Clearances ................................ 7
Rig and Place Unit ................................ 7
Inspection ..................................... 8
Introduction .................................... 8
Use of Rigging Bracket ........................... 8
Select and Install Ductwork .......................... 8
Converting Horizontal Discharge Units to Downflow
(Vertical) Discharge Units ......................... 9
Provide for Condensate Disposal .................... 10
Install Flue Hood ................................. 10
Install Gas Piping ................................ 10
Install Electrical Connections ....................... 11
High- Voltage Connections ....................... 11
Routing Power Leads Into Unit .................... 12
Connecting Ground Lead to Ground Screw .......... 12
Routing Control Power Wires .................... 12
Accessory Installation ........................... 12
Special Procedures for 208-v Operation ............. 12
PRE-START-UP .................................. 15
START-UP .................................... 15-26
Unit Start-Up and Troubleshooting .................. 15
Sequence of Operation ......................... 19-25
Check for Refrigerant Leaks ........................ 25
Start-Up Adjustments ............................. 25
Checking Cooling and Heating Control Operation ..... 25
Checking and Adjusting Refrigerant Charge .......... 25
Refrigerant Charge ............................. 25
No Charge .................................... 25
Low Charge Cooling ............................ 25
To Use Cooling Charging Charts ................... 26
Non-Communicating Emergency Cooling/Heating Mode . 26
MAINTENANCE ............................... 27-30
Air Filter ....................................... 28
Indoor Fan and Motor ............................. 28
Combustion-Air Blower ........................... 28
Burner Ignition .................................. 28
C99001
Fig. 1 - Unit 48DT
Main Burners ................................... 28
Inducer Pressure Switch ........................... 28
Outdoor Coil, Indoor ('oil, and Condensate Drain Pan .... 28
Outdoor Fan .................................... 29
Electrical Controls and Wiring ...................... 29
Refrigerant Circuit ................................ 29
Indoor Airflow .................................. 29
Metering Devices-TXV & AccuRater Piston .......... 29
Pressure Switches ................................ 29
Loss-of-Charge Switch ........................... 29
High-Pressure Switches ........................... 29
Copeland Scroll Compressor (Puron (5:Refrigerant) ....... 29
Refrigerant System ............................... 30
Refrigerant ................................... 30
Compressor Oil ................................ 30
Servicing Systems on Roofs with Synthetic Materials ... 30
Liquid-Line Filter Drier ......................... 30
Puron (R-410A) Refrigerant Charging .............. 30
TROUBLESHOOTING .......................... 30-32
FINAL CHECKS .................................. 32
CARE AND MAINTENANCE ....................... 32
START-UP CHECKLIST ........................... 36
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.