1
50SD
Legacyt Single--Packaged Air Conditioner System
W it h R--22 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--9.................
Check Equipment 2.................................
Identify Unit 2...................................
Inspect Shipment 2................................
Provide Unit Support 2..............................
Roof Curb 2.....................................
Slab Mount 2....................................
Ground Mount 2.................................
Provide Clearances 2................................
Field Fabricate Ductwork 2...........................
Rig and Place Unit 2................................
Inspection 2.....................................
Installation 6.....................................
Use of Rigging Bracket 6...........................
Connect Condensate Drain 7..........................
Install Duct Connections 7............................
Configuring Units for Downflow (Vertical) Discharge 7.....
Install Electrical Connections 8........................
High-- Voltage Connections 9........................
Special Procedures for 208v Operation 9...............
Control Voltage Connections 9.......................
Standard Connection 9.............................
Transformer Protection 9...........................
PRE-- START--UP 10..................................
START--UP 10.......................................
Check for Refrigerant Leaks 10........................
Start-- Up Adjustments 12.............................
Checking Cooling Control Operation 12...............
Checking and Adjusting Refrigerant Charge 12..........
Indoor Airflow and Airflow Adjustments 17............
Cooling Sequence of Operation 17....................
MAINTENANCE 18--19...............................
Air Filter 18.......................................
Indoor Blower and Motor 18..........................
Outdoor Coil, Indoor Coil, and Condensate Drain Pan 19....
Outdoor Fan 19....................................
Electrical Controls and Wiring 19......................
Refrigerant Circuit 19................................
Indoor Airflow 19..................................
Metering Devices–AccuRater
®
Piston 19................
TROUBLESHOOTING 19.............................
START--UP CHECKLIST 19...........................
C99001
Fig. 1 -- Unit 50SD
SAFETY CONSIDERATIONS
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 basic maintenance functionssuch
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 you seethissymbolon theunitand in instructions or manuals,
be alert to the potential for personal injury. Understand these signal
words: DANGER, WARNING, and CAUTION. These wo rds are
used with the safety-- alert symbol. DANGER identifies the most se-
rious hazards which will result in severe personal injury or death.
WARNING signifies hazards which could result in personal injury
or death. CAUTION is used to identify unsafe practices which may
result in minor personal injury or product and property damage.
NOTE is used to highlight suggestions which will result in en-
hanced installation, reliability, or operation.
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