1
48SD
Single--Packaged Gas Furnace/Air Conditioner
Syst em wit h R--22 Refrigeran t
Single-- And Three--Phase Units Sizes 018--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--12................
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 6................................
Rig and Place Unit 6................................
Inspection 6.....................................
Use of Rigging Bracket 6...........................
Connect Condensate Drain 8..........................
Install Flue Hood 8..................................
Install Gas Piping 9.................................
Install Duct Connections 9............................
Configuring Units for Downflow (Vertical)
Discharge 9.....................................
Install Electrical Connections 11.......................
High-- Voltage Connections 11.......................
Special Procedures for 208--V Operation 11.............
Control Voltage Connections 11......................
Heat Anticipator Setting 12.........................
Transformer Protection 12..........................
PRE-- START --UP 12..................................
START--UP AND TROUBLESHOOTING 12 -- 19...........
Check for Refrigerant Leaks 12........................
Start--Up Heating & Make Adjustments 13...............
Check Heating Control 13..........................
Check Gas Input 13...............................
Adjust Gas Input 13...............................
Check Burner Flame 14............................
Airflow and Temperature Rise 14.....................
Heating Sequence of Operation 14....................
Limit Switches 18................................
Rollout Switch 18................................
Start--Up Cooling & Make Adjustments 18...............
Checking Cooling Control Operation 18...............
Checking & Adjusting Refrigerant Charge 18...........
Indoor Airflow and Airflow Adjustments 19............
Cooling Sequence of Operation 19....................
MAINTENANCE 23--25...............................
Air Filter 23.......................................
Indoor Blower and Motor 23..........................
Flue Gas Passageways 23.............................
Induced Draft (Combustion Air) Blower 24...............
A99338
Fig. 1 -- Unit 48SD
(Low NOx Model Available)
Limit Switch 24....................................
Burner Ignition 24..................................
Main Burners 24...................................
Outdoor Coil, Indoor Coil, & Condensate Drain Pan 24.....
Outdoor Fan 25....................................
Electrical Controls and Wiring 25......................
Refrigerant Circuit 25................................
Indoor Airflow 25..................................
Metering Devices--
Thermostatic Expansion Valve 25....................
AccuRatert Piston 25.............................
Liquid Line Strainer 25..............................
TROUBLESHOOTING 25 --27..........................
START--UP CHECKLIST 25...........................
SAFETY CONSIDERAT IONS
Installation and servicing of this equipment can be hazardous dueto
mechanical and electrical components. Only trained and qualified
personnel should install, repair, or service this equipment.
Untrained personnel can 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.
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.
Recognize safety information. This is the safety--alert symbol
.
When youseethissymbolon the unitand in instructions ormanuals,
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