Carrier 48XT-A Installation Instructions Manual
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Brand: Carrier
Category: Air Conditioner , Heat Pump
Type: Installation instructions manual for Carrier 48XT-A
Pages: 38
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48XT---A
Infinityt 15 SEER
Single---Packaged HYBRID HEAT
®
Dual Fuel System
With Puron
®
(R---410A) Refrigerant
2 t o 5 N o m i n a l To n s ( S i z e s 2 4 --- 6 0 )
Installation Instructions
EQUIPMENT OPERATION HAZARD
OAT sensor must be field installed. See Accessory
Installation for more details.
WARNING
!
EQUIPMENT OPERATION HAZARD
This Infinityt unit is designed for use with an Infinity User
Interface.
WARNING
!
NOTE: Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 2.........................
INTRODUCTION 2...................................
RECEIVING AND INSTALLATION 2--13.................
Check Equipment 2..................................
Identify Unit 2....................................
Inspect Shipment 2.................................
Provide Unit Support 2...............................
Roof Curb 2......................................
Slab Mount 3.....................................
Provide Clearances 3.................................
Rig and Place Unit 3.................................
Inspection 3......................................
Rigging/Lifting of Unit 3............................
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 11.................................
Install Electrical Connections 12........................
High-- Voltage Connections 12........................
Routing Power Leads Into Unit 12.....................
Connecting Ground Lead to Ground Screw 12...........
Routing Control Power Wires 12.....................
Accessory Installation 13............................
Special Procedures for 208--v Operation 13..............
PRE--START--UP 15...................................
START--UP 16--28.....................................
Unit Start-- Up and Troubleshooting 16...................
Sequence of Operation 21--27..........................
Check for Refrigerant Leaks 27.........................
Start-- Up Adjustments 27..............................
Checking Cooling and Heating Control Operation 27......
Checking and Adjusting Refrigerant Charge 27...........
A09032
Fig. 1 -- Unit 48XT--A
Refrigerant Charge 27..............................
No Charge 27.....................................
Low Charge Cooling 27.............................
To Use Cooling Charging Charts 28....................
Non--Communicating Emergency Cooling/Heating Mode 28..
MAINTENANCE 30--3 1................................
Air Filter 30........................................
Indoor Fan and Motor 30..............................
Combustion--Air Blower 30............................
Burner Ignition 30...................................
Main Burners 30....................................
Inducer Pressure Switch 31............................
Outdoor Coil, Indoor Coil, and Condensate Drain Pan 31.....
Outdoor Fan 31.....................................
Electrical Controls and Wiring 31.......................
Refrigerant Circuit 31.................................
Indoor Airflow 31...................................
Metering Devices–TXV & AccuRater
®
Piston 31...........
Pressure Switches 31.................................
L o s s -- o f -- C h a r g e S w i t c h 3 2............................
High--Pressure Switches 32............................
Copeland Scroll Compressor (Puron
®
Refrigerant) 32........
Refrigerant System 32................................
Refrigerant 32....................................
Compressor Oil 32.................................
Servicing Systems on Roofs with Synthetic Materials 32....
Liquid--Line Filter Drier 32..........................
Puron (R--410A) Refrigerant Charging 32...............
TROUBLESHOOTING 33 --3 4...........................
FINAL CHECKS 34...................................
CARE AND MAINTENANCE 34........................
START--UP CHECKLIST 38............................