Carrier 48XP024 - User Manual

1
48XP(N)
Single--Packaged Gas Furnace/Air Conditioner
System with Puronr ( R--410A) Refrigerant
Single-- And Three--Phase Units Sizes 024--060
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 1........................
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 2....................................
Ground Mount 2.................................
Field Fabricate Ductwork 2...........................
Provide Clearances 2................................
Rig and Place Unit 4................................
Connect Condensate Drain 6..........................
Install Flue Hood 7..................................
Install Gas Piping 7.................................
Install Duct Connections 9............................
Configuring Units for Downflow (Vertical)
Discharge 9.....................................
Install Electrical Connections 10.......................
High--Voltage Connections 10.......................
Special Procedures for 208--V Operation 11.............
Control Voltage Connections 11......................
Easy Selectt 11..................................
Transformer Protection 14..........................
PRE--START--UP 14..................................
START--UP 14--21....................................
Check for Refrigerant Leaks 14........................
Unit Sequence of Operation 14........................
48XP Sequence of Operation 14.....................
Start--Up Heating & Make Adjustments 15...............
Check Heating Control 15..........................
Check Gas Input 15...............................
Adjust Gas Input 15...............................
Check Burner Flame 16............................
Airflow and Temperature Rise 16.....................
Heating Sequence of Operation 16....................
Limit Switches 16................................
Rollout Switch 17................................
Start--Up Cooling & Make Adjustments 17...............
Checking Cooling Control Operation 17...............
Checking & Adjusting Refrigerant Charge 21...........
Indoor Airflow and Airflow Adjustments 21............
MAINTENANCE 22--25...............................
Air Filter 22.......................................
Evaporator Blower and Motor 22.......................
Flue Gas Passageways 22.............................
C99088
Fig. 1 -- Unit 48XP
Combustion Air Blower 23...........................
Limit Switch 23....................................
Burner Ignition 23..................................
Main Burners 23...................................
Condenser Coil, Evaporator Coil, & Condensate
Drain Pan 23......................................
Condenser Fan 24..................................
Electrical Controls and Wiring 24......................
Refrigerant Circuit 24................................
Gas Input 24.......................................
Evaporator Airflow 24...............................
PuronR Items 25...................................
TROUBLESHOOTING 26.............................
START--UP CHECKLIST 26...........................
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.
Follow all safety codes. Installation must be in compliance with
local and national building codes. Wear safety glasses, protective
clothing, and work gloves. Have fire extinguisher available. Read
these instructions thoroughly and follow all warnings or cautions
included in literature and attached to the unit.

Carrier 48XP024 Specifications