1
704D----A
LEGACYt 13 SEER SINGLE--PACKAGED AIR CONDITIONER SYSTEM
WITH PURON (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--10.................
Check Equipment 2..................................
Identify Unit 2....................................
Inspect Shipment 2.................................
Provide Unit Support 2...............................
Roof Curb 2......................................
Slab Mount 2.....................................
Provide Clearances 2.................................
Field Fabricate Ductwork 2............................
Rig and Place Unit 6.................................
Inspection 6......................................
Rigging/Lifting of Unit 7............................
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 10.............................
Transformer Protection 10...........................
PRE --START--UP 11...................................
START--UP 11--13.....................................
Check for Refrigerant Leaks 11.........................
Start-- Up Adjustments 11..............................
Checking Cooling Control Operation 11................
Checking and Adjusting Refrigerant Charge 11...........
Indoor Airflow and Airflow Adjustments 12.............
Single Cooling Fan Speed Set--up 12...................
Two Cooling Fan Speeds Set--up 12....................
Continuous Fan Operation 13........................
Cooling Sequence of Operation 13.....................
MAINTENANCE 22--24................................
Air Filter 22......................................
Indoor Blower and Motor 22.........................
Outdoor Coil, Indoor Coil, and Condensate Drain Pan 23...
Outdoor Fan 23...................................
Electrical Controls and Wiring 23.....................
Refrigerant Circuit 24...............................
Evaporator Airflow 24..............................
Puron Items 24....................................
TROUBLESHOOTING 25..............................
START--UP CHECKLIST 25............................
VERTICAL ECONOMIZER 29 -- 4 7.......................
General 29.........................................
Accessories 29......................................
Installation 29--35...................................
Small Chassis 29--30...............................
Large Chassis 33--35...............................
A09034
Fig. 1 -- Unit 704D----A
CONFIGURATION 36 -- 4 5..............................
OPERATION 46......................................
TROUBLESHOOTING 47..............................
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. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have 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 Electrical Code (NEC) NFPA 70.
In Canada refer to the current editions of the Canadian Electrical
Code CSA C22.1.
Recognize safety information. This is the safety--alert symbol
.
When you see this symbol on the unit and in instructions or manu-
als, be alert to the potential for personal injury. Understand these
signal words: DANGER, WARNING, and CAUTION. Th ese
words are used with the safety--alert symbol. DANGER identifies
the most serious hazards which will result in severe personal injury
or death. WARNING signifies hazards which could result in per-
sonal injury or death. CAUTION is used to identify unsafe practic-
es which may result in minor personal injury or product and prop-
erty damage. NOTE is used to highlight suggestions which will
result in enhanced installation, reliability , or operation.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing or servicing system, always turn off main
power to system and install lockout tag. There may be
more than one disconnect switch. Turn off accessory heater
power switch if applicable.
!
WARNING
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