1
574D----A
LEGACYt 13 SEER SINGLE--PACKAGED AIR CONDITIONER AND
GAS FURNACE SYSTEM WITH PURONR (R--410A) REFRIGERANT
SINGLE AND THREE PHASE
2--5 NOMINAL TONS (SIZES 24--60)
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 6.....................................
Field Fabricate Ductwork 6............................
Provide Clearances 6.................................
Rig and Place Unit 6.................................
Inspection 6......................................
Rigging/Lifting 6..................................
Connect Condensate Drain 9...........................
Install Flue Hood 9...................................
Install Gas Piping 9..................................
Install Duct Connections 10............................
Configuring Units for Downflow (Vertical)
Discharge 10.....................................
Install Electrical Connections 11........................
High--Voltage Connections 11........................
Special Procedures for 208--V Operation 12..............
Control Voltage Connections 12.......................
Standard Connection 12.............................
Heat Anticipator Setting 12..........................
Transformer Protection 12...........................
PRE-- START--UP 13...................................
START--UP 13--21.....................................
Check for Refrigerant Leaks 13.........................
Start--Up Heating & Make Adjustments 13................
Check Heating Control 14...........................
Check Gas Input 14................................
Adjust Gas Input 14................................
Check Burner Flame 15.............................
Normal Operation 22...............................
Airflow and Temperature Rise 22......................
Heating Sequence of Operation 22.....................
Limit Switches 22.................................
Rollout Switch 22.................................
Start-- Up Cooling & Make Adjustments 22................
Checking Cooling Control Operation 22................
Checking & Adjusting Refrigerant Charge 22............
Indoor Airflow and Airflow Adjustments 23.............
Continuous Fan Operation 23........................
Cooling Sequence o f Operation 24.....................
MAINTENANCE 31--34................................
Air Filter 31......................................
A09034
Fig. 1 -- Unit 574D ----A
(Low NOx Model Available)
Indoor Blower an d Motor 31.........................
Induced Draft (Combustion Air) Blower 32..............
Flue Gas Passageways 32............................
Limit Switch 32...................................
Burner Ignition 32.................................
Main Bu rners 32...................................
Removal of Gas Train 32............................
Outdoor Coil, Indoor Coil, & Condensate Drain Pan 32....
Outdoor Fan 33...................................
Electrical Controls and Wiring 34.....................
Refrigerant Circuit 34...............................
Gas Input 34......................................
Evaporator Airflow 34..............................
Puron Items 34....................................
TROUBLESHOOTING 35..............................
START--UP CHECKLIST 35............................
VERTICAL ECONOMIZER 40 -- 5 7.......................
General 40.........................................
Accessories 40......................................
Installation 40......................................
Small Chassis 40--41...............................
Large Chassis 44--46...............................
CONFIGURATION 47 -- 5 5..............................
OPERATION 5 6......................................
TROUBLESHOOTING 57..............................
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, personal injury, or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory--authorized kits or accessories
when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Have a fire extinguisher available. Read these
instructions thoroughly and follow all warnings or cautions
included in literature and attached to the unit. Consult local
building codes, the current editions of the National Fuel Gas Code
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