Specifications

CONTENTS (cont)
Page
Ordering Replacement Chiller Parts ..........71
TROUBLESHOOTING GUIDE ...............71-97
Overview ...................................71
Checking the Display Messages .............71
Checking Temperature Sensors ..............71
• RESISTANCE CHECK
• VOLTAGE DROP
• CHECK SENSOR ACCURACY
• DUAL TEMPERATURE SENSORS
Checking Pressure Transducers .............72
• TRANSDUCER REPLACEMENT
Control Algorithms Checkout Procedure .....72
Control Test ................................72
Control Modules ............................82
• RED LED (Labeled as STAT)
• GREEN LED (Labeled as COM)
Notes on Module Operation ..................82
Page
Chiller Control Module (CCM) ................83
• INPUTS
• OUTPUTS
Integrated Starter Module (ISM) ..............83
• INPUTS
• OUTPUTS
Replacing Defective Processor Modules ......83
• INSTALLATION
Solid-State Starters .........................83
• TESTING SILICON CONTROL RECTIFIERS IN
BENSHAW, INC., SOLID-STATE STARTERS
• SCR REMOVAL/INSTALLATION
Physical Data ...............................85
INDEX ......................................98
INITIAL START-UP CHECKLIST FOR
19XRT HERMETIC CENTRIFUGAL
LIQUID CHILLER .................CL-1 to CL-12
INTRODUCTION
Prior to initial start-up of the 19XRT chiller, those in-
volved in the start-up, operation, and maintenance should be
thoroughly familiar with these instructions and other nec-
essary job data. This book is outlined to familiarize those
involved in the start-up, operation and maintenance of the
unit with the control system before performing start-up pro-
cedures. Procedures in this manual are arranged in the se-
quence required for proper chiller start-up and operation.
This unit uses a microprocessor control system. Do not
short or jumper between terminations on circuit boards
or modules. Control or board failure may result.
Be aware of electrostatic discharge (static electricity)
when handling or making contact with circuit boards or
module connections. Always touch a chassis (grounded)
part to dissipate body electrostatic charge before work-
ing inside control center.
Use extreme care when handling tools near circuit boards
and when connecting or disconnecting terminal plugs.
Circuit boards can be damaged easily. Always hold boards
by the edges, and avoid touching components and
connections.
This equipment uses, and can radiate, radio fre-
quency energy. If not installed and used in accordance
with the instruction manual, it may interfere with radio
communications. This equipment has been tested and
found to comply with the limits for a Class A comput-
ing device pursuant to Subpart J of Part 15 of FCC Rules,
which are designed to provide reasonable protection against
such interference when operated in a commercial envi-
ronment. Operation of this equipment in a residential
area is likely to cause interference, in which case the
user, at his own expense, will be required to take
whatever measures may be required to correct the
interference.
Always store and transport replacement or defective
boards in an anti-static shipping bag.
ABBREVIATIONS AND EXPLANATIONS
Frequently used abbreviations in this manual include:
CCM — Chiller Control Module
CCN — Carrier Comfort Network
CVC — Chiller Visual Control
CCW — Counterclockwise
CW — Clockwise
ECDW — Entering Condenser Water
ECW — Entering Chilled Water
EMS — Energy Management System
HGBP — Hot Gas Bypass
I/O — Input/Output
ISM — Integrated Starter Module
LCD — Liquid Crystal Display
LCDW — Leaving Condenser Water
LCW — Leaving Chilled Water
LED — Light-Emitting Diode
OLTA — Overload Trip Amps
PIC II — Product Integrated Control II
RLA — Rated Load Amps
SCR — Silicon Controlled Rectifier
SI — International System of Units
TXV — Thermostatic Expansion Valve
Words printed in all capital letters or in italics may be viewed
on the Chiller Visual Control (CVC) (e.g., LOCAL, CCN,
ALARM, etc.).
Words printed in both all capital letters and italics can also
be viewed on the CVC and are parameters (e.g., CONTROL
MODE, COMPRESSOR START RELAY, ICE BUILD
OPTION, etc.) with associated values (e.g., modes, tempera-
tures, percentages, pressures, on, off, etc.).
Words printed in all capital letters and in a box represent
softkeys on the CVC control panel (e.g., ENTER
,
EXIT
, INCREASE , QUIT , etc.).
Factory-installed additional components are referred to as
options in this manual; factory-supplied but field-installed
additional components are referred to as accessories.
The chiller software part number of the 19XRT unit is lo-
cated on the back of the CVC.
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