Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500194-01
Printed in U.S.A.
Form 50XCW-7SI
Pg 1
718 1-18
Replaces: 50XCW-6SI
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
. . . . . . . . . . . . . . . . . . . . 16
Step 3 — Install Evaporator (Supply) Ductwork
. 16
Step 4 — Install Return-Air Ductwork
. . . . . . . . . . . 16
Step 5 — Check Return-Air Filters
. . . . . . . . . . . . . . 16
Step 6 — Make Condenser Connections
. . . . . . . . 16
Step 7 — Install Condensate Drain Line
. . . . . . . . . 16
Step 8 — Complete Electrical Connections
. . . . . . 17
Step 9 — Install Piping
. . . . . . . . . . . . . . . . . . . . . . . . 20
Step 10 — Install Plenums (if Required)
. . . . . . . . . 24
Step 11 — Check Fan Sheave and Belt
Alignment
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
START-UP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
General
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Compressor Rotation
. . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Operating Sequence
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Water Regulating Valve
. . . . . . . . . . . . . . . . . . . . . . . . . 33
SERVICE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Cleaning Evaporator Coil
. . . . . . . . . . . . . . . . . . . . . . . 34
Lubrication
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Indoor Fan Adjustment
. . . . . . . . . . . . . . . . . . . . . . . . . . 34
Pulley Alignment
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Belt Tension Adjustment
. . . . . . . . . . . . . . . . . . . . . . . . 34
Changing Fan Wheel
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Fan Bearing Replacement
. . . . . . . . . . . . . . . . . . . . . . . 34
Concentric Alignment
. . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Evaporator Motor Starter Setting
(after Lockout/Tagout)
. . . . . . . . . . . . . . . . . . . . . . . . 35
MAINTENANCE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Cleaning
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Inspection
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Condensate Drain
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Water-Cooled Condensers
. . . . . . . . . . . . . . . . . . . . . . 36
Cleaning Heating Coils
. . . . . . . . . . . . . . . . . . . . . . . . . . 36
Cleaning Steam Coils
. . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Checking System Charge
. . . . . . . . . . . . . . . . . . . . . . . 37
Access Panel Removal
. . . . . . . . . . . . . . . . . . . . . . . . . . 37
Evaporator-Fan Motor Removal
. . . . . . . . . . . . . . . . . 37
Pressure Relief Device
. . . . . . . . . . . . . . . . . . . . . . . . . . 37
Current Protection Device
. . . . . . . . . . . . . . . . . . . . . . . 37
High and Low-Pressure Switches
. . . . . . . . . . . . . . . 37
Oil Charge
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
TROUBLESHOOTING
. . . . . . . . . . . . . . . . . . . . . . . . . . . 38
START-UP CHECKLIST
. . . . . . . . . . . . . . . . . CL-1, CL-2
SAFETY CONSIDERATIONS
Installing, starting up, and servicing air-conditioning
com-
ponents and equipment can be dangerous. Only trained, quali-
fied installers and service mechanics should install, start-up,
and service this equipment.
When working on the equipment, observe precautions in the
literature and on 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 discon-
nect 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.
WARNING
DO NOT USE TORCH to remove any component. System
contains oil and refrigerant under pressure.
To remove a component, wear protective gloves and gog-
gles and proceed as follows:
a. Shut off electrical power to unit.
b. Recover refrigerant to relieve all pressure from sys-
tem 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. Refrig-
erant 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 unsweat remaining tubing stubs when nec-
essary. Oil can ignite when exposed to torch flame.
Failure to follow these procedures may result in personal
injury or death.
CAUTION
DO NOT re-use compressor oil or any oil that has been
exposed to the atmosphere. Dispose of oil per local codes
and regulations. DO NOT leave refrigerant system open to
air any longer than the actual time required to service the
equipment. Seal circuits being serviced and charge with
dry nitrogen to prevent oil contamination when timely
repairs cannot be completed. Failure to follow these proce-
dures may result in damage to equipment.
Omnizone™
50XCW06-24
Water-Cooled
Indoor Self-Contained Systems
