Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500277-01
Printed in U.S.A.
Form 50XCA-9SI
Pg 1
2-2020
Replaces: 50XCA-8SI
Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Step 1 — Complete Pre-Installation Checks . . . . . . . 2
Step 2 — Rig and Place Unit . . . . . . . . . . . . . . . . . . 13
• PLACING THE UNIT
Step 3 — Install Additional Vibration Isolation
(if required) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Step 4 — Install Ductwork . . . . . . . . . . . . . . . . . . . . 13
• CONDENSER AIR DUCT
• CONDENSER AIRFLOW LOUVERS
• EVAPORATOR DUCTWORK
Step 5 — Install Condensate Drain Line . . . . . . . . . 16
Step 6 — Complete Electrical Connections . . . . . . 16
• GENERAL
• UNBALANCED 3-PHASE SUPPLY VOLTAGE
• POWER WIRING
• CONTROL WIRING
• WINTER START MODIFICATIONS
Step 7 — Install Plenums (if required) . . . . . . . . . . 18
Step 8 — Check Fan Sheave and Belt Alignment . 19
• ALIGNMENT
• V-BELTS
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . . 32
Operating Sequence . . . . . . . . . . . . . . . . . . . . . . . . . 32
• ROOM-MOUNTED THERMOSTAT
• COOLING
• HEATING
• ALL UNITS
Low Ambient Operation (Factory Installed) . . . . . . 33
2-Speed Fan Operation Sequence . . . . . . . . . . . . . . 33
Configuration of Low Ambient Kit
(Field Installation) . . . . . . . . . . . . . . . . . . . . . . . . . 33
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Cleaning Evaporator and Condenser Coils . . . . . . 34
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Condenser Fan Adjustment . . . . . . . . . . . . . . . . . . . 34
Pulley Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Belt Tension Adjustment . . . . . . . . . . . . . . . . . . . . . 35
Changing Fan Wheel . . . . . . . . . . . . . . . . . . . . . . . . . 35
Fan Bearing Replacement . . . . . . . . . . . . . . . . . . . . .35
Concentric Alignment . . . . . . . . . . . . . . . . . . . . . . . .35
Evaporator and Condenser Motor Starter Setting
(after Lockout/Tagout) . . . . . . . . . . . . . . . . . . . . .35
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Checking System Charge . . . . . . . . . . . . . . . . . . . . .36
Access Panel Removal . . . . . . . . . . . . . . . . . . . . . . .36
• TOP PANEL
• CONTROL PANEL
• BOTTOM PANEL
Evaporator-Fan Motor Removal . . . . . . . . . . . . . . . .36
Pressure Relief Device . . . . . . . . . . . . . . . . . . . . . . .37
Current Protection Device . . . . . . . . . . . . . . . . . . . . .37
High and Low-Pressure Switch . . . . . . . . . . . . . . . .37
Oil Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . .38
START-UP CHECKLIST . . . . . . . . . . . . . . . .CL-1, CL-2
SAFETY CONSIDERATIONS
Installing, starting up, and servicing air-conditioning components
and equipment can be dangerous. Only trained, qualified installers
and service mechanics should install, start-up, and service this
equipment.
When working on the equipment, observe precautions in the liter
-
ature and on the tags, stickers, and labels attached to the equip
-
ment. Follow all safety codes. Wear safety glasses and work
gloves.
WARNING
Electrical shock can cause personal injury and death. Shut off
all power to this equipment during installation. There may be
more than one disconnect switch. Tag all disconnect locations
to alert others not to restore power until work is completed.
CAUTION
Use care in handling, rigging, and setting bulky equipment.
Personal injury could result.
Omnizone™
50XCA06-24
Air-Cooled
Indoor Self-Contained Systems
