Carrier 48DU - User Manual

1
48DU
Infinityt 14 Single--Packaged Air Conditioner and
Gas Furnace Syst em With Puron
®
(R--410A) Refrigerant
2 to 5 Nominal Tons (Sizes 024--060)
Installation Instructions
IMPORTANT: OAT sensor must be field installed. See
Accessory Installation for more details.
IMPORTANT: This Infinityt 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--25....................................
Unit Start-- Up and Troubleshooting 15..................
Sequence of Operation 19-- 24.........................
Check for Refrigerant Leaks 24........................
Start-- Up Adjustments 24.............................
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 25...................
Non-- Communicating Emergency Cooling/Heating Mode 25.
MAINTENANCE 27 --29...............................
Air Filter 27.......................................
Indoor Fan and Motor 27.............................
Inducer Blower 27..................................
Limit Switch 27....................................
A05307
Fig. 1 -- Unit 48DU
Burner Ignition 27..................................
Main B urn ers 27...................................
Inducer Pressure Switch 27...........................
Outdoor Coil, Indoor Coil, and Condensate Drain Pan 28....
Outdoor Fan 28....................................
Electrical Controls and Wiring 28......................
Refrigerant Circuit 28................................
Indoor Airflow 28..................................
Pressure Switches 28................................
L o s s -- o f -- C h a r g e S w i t c h 2 8...........................
High--Pressure Switches 28...........................
Copeland Scroll Compressor (Puron
®
Refrigerant) 29.......
Refrigerant System 29...............................
Refrigerant 29...................................
Compressor Oil 29................................
Servicing Systems on Roofs with Synthetic Materials 29...
Liquid--Line Filter Drier 29.........................
Puron (R-- 410A) Refrigerant Charging 29..............
TROUBLESHOOTING 29 --31..........................
FINAL CHECKS 31..................................
CARE AND MAINTENANCE 31.......................
START--UP CHECKLIST 35...........................
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.
Untrainedpersonnelcan perform basicmaintenance 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.

Carrier 48DU Specifications