Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500265-01
Printed in U.S.A.
Form 50XCW-8SI
Pg 1
11-19
Replaces: 50XCW-7SI
Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Step 1 — Complete Pre-Installation Checks . . . . . . . 2
Step 2 — Rig and Place Unit . . . . . . . . . . . . . . . . . . 17
Step 3 — Install Evaporator (Supply) Ductwork . . . 17
Step 4 — Install Return-Air Ductwork . . . . . . . . . . . 17
Step 5 — Check Return-Air Filters . . . . . . . . . . . . . 17
Step 6 — Make Condenser Connections . . . . . . . . 17
Step 7 — Install Condensate Drain Line . . . . . . . . . 17
Step 8 — Complete Electrical Connections . . . . . . 18
Step 9 — Install Piping . . . . . . . . . . . . . . . . . . . . . . . 21
Step 10 — Install Plenums (if Required) . . . . . . . . . 24
Step 11 — Check Fan Sheave and Belt Alignment 25
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . . 27
Operating Sequence . . . . . . . . . . . . . . . . . . . . . . . . . 34
Water Regulating Valve . . . . . . . . . . . . . . . . . . . . . . 34
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Cleaning Evaporator Coil . . . . . . . . . . . . . . . . . . . . . 35
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Indoor Fan Adjustment . . . . . . . . . . . . . . . . . . . . . . . 35
Pulley Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Belt Tension Adjustment . . . . . . . . . . . . . . . . . . . . . 35
Changing Fan Wheel . . . . . . . . . . . . . . . . . . . . . . . . . 35
Fan Bearing Replacement . . . . . . . . . . . . . . . . . . . . 35
Concentric Alignment . . . . . . . . . . . . . . . . . . . . . . . . 35
Evaporator Motor Starter Setting (after Lockout/
Tagout) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Water-Cooled Condensers . . . . . . . . . . . . . . . . . . . . 37
Cleaning Heating Coils . . . . . . . . . . . . . . . . . . . . . . . 37
Cleaning Steam Coils . . . . . . . . . . . . . . . . . . . . . . . . 37
Checking System Charge . . . . . . . . . . . . . . . . . . . . . 38
Access Panel Removal . . . . . . . . . . . . . . . . . . . . . . . 38
Evaporator-Fan Motor Removal . . . . . . . . . . . . . . . . 38
Pressure Relief Device . . . . . . . . . . . . . . . . . . . . . . . 38
Current Protection Device . . . . . . . . . . . . . . . . . . . . .38
High and Low-Pressure Switches . . . . . . . . . . . . . .38
Oil Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . .39
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . .CL-1
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 tags, stickers, and labels attached to the equipment.
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.
DANGER
DO NOT USE TORCH to remove any component. System
contains oil and refrigerant under pressure.
To remove a component, wear protective gloves and goggles
and proceed as follows:
a. Shut off electrical power to unit.
b. Recover refrigerant to relieve all pressure from system
using both high-pressure and low pressure ports.
c. Traces of vapor should be displaced with nitrogen and
the work area should be well ventilated. Refrigerant in
contact with an open flame produces toxic gases.
d. Cut component connection tubing with tubing cutter and
remove component from unit. Use a pan to catch any oil
that may come out of the lines and as a gage for how
much oil to add to the system.
e. Carefully un-sweat remaining tubing stubs when neces-
sary. Oil can ignite when exposed to torch flame.
Failure to follow these procedures may result in personal inju-
ry or death.
Omnizone™
50XCW06-24
Water-Cooled
Indoor Self-Contained Systems
