
Installation Instructions
TABLE OF CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . .1
MODEL NUMBER NOMENCLATURE AND
DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . . . . . . .2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Step 1 — Plan for Unit Location. . . . . . . . . . . . . . . . . . .6
• ROOF MOUNT
Step 2 — Plan for Sequence of Unit
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
• CURB-MOUNTED INSTALLATION
• PAD-MOUNTED INSTALLATION
• FRAME-MOUNTED INSTALLATION
Step 3 — Inspect Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Step 4 — Provide Unit Support . . . . . . . . . . . . . . . . . . .7
• ROOF CURB MOUNT
• SLAB MOUNT (HORIZONTAL UNITS ONLY)
• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
SLAB MOUNT)
Step 5 — Field Fabricate Ductwork . . . . . . . . . . . . . . .9
• UNITS WITH ACCESSORY ELECTRIC HEATERS
Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . .9
• POSITIONING ON CURB
Step 7 — Convert to Horizontal and
Connect Ductwork (When Required) . . . . . . . . . . . . .10
Step 8 — Install Outside Air Hood . . . . . . . . . . . . . . .11
• ECONOMIZER AND TWO-POSITION DAMPER HOOD
PACKAGE REMOVAL AND SETUP (FACTORY
OPTION)
• ECONOMIZER AND TWO-POSITION HOOD
ASSEMBLY
Step 9 — Units with Hinged Panels Only . . . . . . . . .12
Step 10 — Install External Condensate Trap
and Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Step 11 — Make Electrical Connections . . . . . . . . .13
• FIELD POWER SUPPLY
• UNITS WITH FACTORY-INSTALLED DISCONNECT
• UNITS WITHOUT FACTORY-INSTALLED
DISCONNECT
•ALLUNITS
• CONVENIENCE OUTLETS
• FACTORY-OPTION THRU-BASE CONNECTIONS
(ELECTRICAL CONNECTIONS)
• UNITS WITHOUT THRU-BASE CONNECTIONS
(ELECTRICAL CONNECTIONS)
• FIELD CONTROL WIRING
• THERMOSTAT
• HEAT ANTICIPATOR SETTINGS
• ELECTRIC HEATERS
•PERFECTHUMIDITY™CONTROL CONNECTIONS
• CONTROL AND POWER WIRING DIAGRAMS
• ECONOMI$ER®(FACTORY OPTION)
• SMOKE DETECTORS
• RTU OPEN CONTROLLER (FACTORY OPTION)
• CONTROLLER OPTIONS
Step 12 — Adjust Factory-Installed Options . . . . .40
• SMOKE DETECTORS
• ECONOMI$ER IV OCCUPANCY SWITCH
Step 13 — Install Accessories . . . . . . . . . . . . . . . . . . .40
Step 14 — Check Belt Tension. . . . . . . . . . . . . . . . . . .40
Pre-Start and Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . .40
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, mainte-
nance, or use can cause explosion, fire, electrical shock or other
conditions which may cause 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 mod-
ifying this product. Refer to the individual instructions packaged
with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses and work gloves. Use
quenching cloths for brazing operations and have a fire extin-
guisher available. Read these instructions thoroughly and follow
all warnings or cautions attached to the unit. Consult local build-
ing codes and appropriate national electrical codes (in USA,
ANSI/NFPA70, National Electrical Code (NEC); in Canada, CSA
C22.1) for special requirements.
It is important to recognize safety information. This is the safety-
alert symbol . When you see this symbol on the unit and in in-
structions or manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. These 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 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 enhanced installation, reliability,
or operation.
551J 04-06
Single Package Rooftop Cooling Only with
Puron®(R-410A) Refrigerant