Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 903
Catalog No. 533-00052
Printed in U.S.A.
Form 30G,H-9T
Pg 1
1-04
Replaces: New
Book 2
Tab
5c
Controls Start-Up, Operation,
Service, and Troubleshooting
SAFETY CONSIDERATIONS
Installing, starting up, and servicing this equipment can be
hazardous due to system pressures, electrical components, and
equipment location (roof, elevated structures, etc.). Only
trained, qualified installers and service mechanics should
install, start up, and service this equipment.
When working on this equipment, observe precautions in
the literature, and on tags, stickers, and labels attached to the
equipment, and any other safety precautions that apply. Follow
all safety codes. Wear safety glasses and work gloves. Use care
in handling, rigging, and setting this equipment, and in
handling all electrical components.
CONTENTS
Page
SAFETY CONSIDERATIONS
. . . . . . . . . . . . . . . . . . . . . . 1
GENERAL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2,3
MAJOR SYSTEM COMPONENTS
. . . . . . . . . . . . . . . .3,4
Main Base Board (MBB)
. . . . . . . . . . . . . . . . . . . . . . . . . . 3
Screw Compressor Board (SCB)
. . . . . . . . . . . . . . . . . 3
Electronic Expansion Valve (EXV) Board
. . . . . . . . . 3
Comfort
Link Compressor Protection
(CCP) Board
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Energy Management Module (EMM)
. . . . . . . . . . . . . . 3
Enable/Off/Remote Connect Switch
. . . . . . . . . . . . . . 3
Emergency On/Off Switch
. . . . . . . . . . . . . . . . . . . . . . . . 3
Board Addresses
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Control Module Communication
. . . . . . . . . . . . . . . . . . 3
Carrier Comfort Network (CCN) Interface
. . . . . . . . . 3
OPERATION DATA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40
Electronic Expansion Valve (EXV)
. . . . . . . . . . . . . . . . 4
• EXV OPERATION
• ECONOMIZER OPERATION
Oil Pumps
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Motor Cooling
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Back Pressure Valve (30GXN,R
and 30HXA only)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Sensors
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Comfort
Link Compressor Protection
(CCP) Board
7
• OUTPUTS
• INPUTS
Wye-Delta vs Across-the-Line (XL)
Starting Option
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Capacity Control
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
• MINUTES LEFT FOR START
• MINUTES OFF TIME
• LOADING SEQUENCE
• CLOSE CONTROL
• LEAD/LAG DETERMINATION
• CAPACITY SEQUENCE DETERMINATION
• MINIMUM LOAD VALVE
• CAPACITY CONTROL OVERRIDES
Electrical shock can cause personal injury and death. Shut
off all power to this equipment during installation and ser-
vice. There may be more than one disconnect switch. Tag
all disconnect locations to alert others not to restore power
until work is completed.
This unit uses a microprocessor-based electronic control
system. Do not use jumpers or other tools to short out com-
ponents, or to bypass or otherwise depart from recom-
mended procedures. Any short-to-ground of the control
board or accompanying wiring may destroy the electronic
modules or electrical components.
To prevent potential damage to heat exchanger tubes
always run fluid through heat exchangers when adding or
removing refrigerant charge. Use appropriate brine solu-
tions in cooler and condenser fluid loops to prevent the
freezing of heat exchangers when the equipment is exposed
to temperatures below 32 F (0
°
C).
DO NOT VENT refrigerant relief valves within a building.
Outlet from relief valves must be vented outdoors in accor-
dance with the latest edition of ANSI/ASHRAE (American
National Standards Institute/American Society of Heating,
Refrigeration and Air Conditioning Engineers) 15 (Safety
Code for Mechanical Refrigeration). The accumulation of
refrigerant in an enclosed space can displace oxygen and
cause asphyxiation. Provide adequate ventilation in enclosed
or low overhead areas. Inhalation of high concentrations of
vapor is harmful and may cause heart irregularities,
unconsciousness or death. Misuse can be fatal. Vapor is
heavier than air and reduces the amount of oxygen available
for breathing. Product causes eye and skin irritation.
Decomposition products are hazardous.
DO NOT attempt to unbraze factory joints when servicing
this equipment. Compressor oil is flammable and there is
no way to detect how much oil may be in any of the refrig-
erant lines. Cut lines with a tubing cutter as required when
performing service. 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 system. DO NOT re-use compressor oil. Do NOT leave
refrigerant system open to air any longer than necessary.
Seal circuits being serviced and charge with dry nitrogen to
prevent oil contamination when timely repairs cannot be
completed.
30GXN,R080-528
30HXA,HXC076-271
Air-Cooled and Water-Cooled Chillers with
ComfortLink™ Controls
50/60 Hz
Series 6
