Carrier Omnizone™ Constant Volume Remote Air-Cooled Cooling Unit 50XCR 50XCR06-24 Omnizone™ Remote Air-Cooled Indoor Self-Contained Systems
Summary
This comprehensive manual provides essential instructions for the professional installation, safe startup, and routine servicing of your Omnizone™ indoor self-contained air-cooling system. It guides trained HVAC professionals through detailed procedures covering everything from initial unit placement and complex electrical connections to running diagnostics and maintenance tasks like coil cleaning and refrigerant recovery. Use this guide to ensure proper setup, optimize performance, and safely maintain your air conditioning equipment.
Page 1 Text Content
Omnizone™ 50XCR06-24 Remote Air-Cooled
Indoor Self-Contained Systems
Installation, Start-Up and Service Instructions CONTENTS SAFETY CONSIDERATIONS
Page Installing, starting up, and servicing air-conditioning components
and equipment can be dangerous. Only trained, qualified installers
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . .
and service mechanics should install, start-up, and service this
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
equipment.
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
When working on the equipment, observe precautions in the liter-
Step 1 — Complete Pre-Installation Checks . . . . . . .
ature and on tags, stickers, and labels attached to the equipment.
Step 2 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . Follow all safety codes. Wear safety glasses and work gloves. Step 3 — Install Supply Ductwork . . . . . . . . . . . . . . . Step 4 — Install Return-Air Ductwork . . . . . . . . . . . .
WARNING
Step 5 — Check Return-Air Filters . . . . . . . . . . . . . . Step 6 — Make Condenser Connections . . . . . . . . .
Electrical shock can cause personal injury and death. Shut off
Step 7 — Install Condensate Drain Line . . . . . . . . . . all power to this equipment during installation. There may be
Step 8 — Complete Electrical Connections . . . . . . more than one disconnect switch. Tag all disconnect locations to alert others not to restore power until work is completed.
Step 9 — Check Fan Sheave and Belt Alignment . START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CAUTION
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Use care in handling, rigging, and setting bulky equipment. Operating Sequence . . . . . . . . . . . . . . . . . . . . . . . . . Personal injury could result. SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cleaning Evaporator Coil . . . . . . . . . . . . . . . . . . . . .
WARNING
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indoor Fan Adjustment . . . . . . . . . . . . . . . . . . . . . . .
DO NOT USE TORCH to remove any component. System
Pulley Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . .
contains oil and refrigerant under pressure.
Belt Tension Adjustment . . . . . . . . . . . . . . . . . . . . .
To remove a component, wear protective gloves and goggles
Changing Fan Wheel . . . . . . . . . . . . . . . . . . . . . . . . .
and proceed as follows:
Fan Bearing Replacement . . . . . . . . . . . . . . . . . . . .
a. Shut off electrical power to unit.
Concentric Alignment . . . . . . . . . . . . . . . . . . . . . . . .
b. Recover refrigerant to relieve all pressure from system
Evaporator Motor Starter Setting (after Lockout/
using both high-pressure and low pressure ports.
Tagout) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
c. Traces of vapor should be displaced with nitrogen and
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
the work area should be well ventilated. Refrigerant in
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
contact with an open flame produces toxic gases.
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
d. Cut component connection tubing with tubing cutter and
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . .
remove component from unit. Use a pan to catch any oil
Checking System Charge . . . . . . . . . . . . . . . . . . . . . that may come out of the lines and as a gauge for how
Pressure Relief Device . . . . . . . . . . . . . . . . . . . . . . . much oil to add to the system.
Current Protection Device . . . . . . . . . . . . . . . . . . . . e. Carefully unsweat remaining tubing stubs when neces-
High and Low-Pressure Switches . . . . . . . . . . . . . . sary. Oil can ignite when exposed to torch flame. Oil Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Failure to follow these procedures may result in personal injury or death.
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-1
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500344-01 Printed in U.S.A. Form 50XCR-9SI Pg 1 2-23 Replaces: 50XCR-8SI
Page Summary Contents For Carrier Omnizone™ Constant Volume Remote Air-Cooled Cooling Unit 50XCR 50XCR06-24 Omnizone™ Remote Air-Cooled Indoor Self-Contained Systems
Manual Details
| Brand | Carrier |
|---|---|
| Pages | 40 |
| File Size | 1.91 MB |
| Published | June 05, 2026 |
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Frequently Asked Questions
What safety precautions must be observed during unit installation?
Always wear safety glasses and work gloves, and ensure all electrical power is shut off and tagged before starting work.
Should I attempt startup if there is a voltage imbalance?
No; if the voltage imbalance exceeds 2%, do not operate the system and call your local power company for assistance.
What are the critical initial steps for replacing a fan bearing?
First, shut off all electrical power to the unit, recover refrigerant to relieve pressure, and use protective gloves and goggles.