Carrier 30GTN Service And Troubleshooting Manual page 2

CONTENTS (cont)
Head Pressure Control . . . . . . . . . . . . . . . . . . . . . . 27
• COMFORTLINK™ UNITS (With EXV)
• UNITS WITH TXV
Pumpout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
• EXV UNITS
• TXV UNITS
Marquee Display Usage . . . . . . . . . . . . . . . . . . . . . 29
Service Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Configuring and Operating Dual Chiller
Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Temperature Reset . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Demand Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
• DEMAND LIMIT (2-Stage Switch Controlled)
• EXTERNALLY POWERED DEMAND LIMIT
(4 to 20 mA Controlled)
• DEMAND LIMIT (CCN Loadshed Controlled)
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 46-51
Compressor Protection Control System
(CPCS) Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Compressor Ground Current (CGC) Board
(30GTN,R130-210, 230A-315A, and
330A/B-420A/B) . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
EXV Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . 46
• STEP 1 − CHECK PROCESSOR EXV OUTPUTS
• STEP 2 - CHECK EXV WIRING
• STEP 3 - CHECK RESISTANCE OF EXV MOTOR
WINDINGS
• STEP 4 - CHECK THERMISTORS THAT
CONTROL EXV
• STEP 5 - CHECK OPERATION OF THE EXV
Alarms and Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52-64
Electronic Components . . . . . . . . . . . . . . . . . . . . . 52
Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
• COMPRESSOR REMOVAL
• OIL CHARGE
Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
• COOLER REMOVAL
• REPLACING COOLER
• SERVICING THE COOLER
Condenser Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Condenser Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Refrigerant Feed Components . . . . . . . . . . . . . . . 56
• ELECTRONIC EXPANSION VALVE (EXV)
• MOISTURE-LIQUID INDICATOR
• FILTER DRIER
• LIQUID LINE SOLENOID VALVE
• LIQUID LINE SERVICE VALVE
Thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
• LOCATION
• REPLACING THERMISTOR T2
• REPLACING THERMISTORS T1,T5,T6,T7, AND T8
• THERMISTORS T3 AND T4
• THERMISTOR/TEMPERATURE SENSOR CHECK
Safety Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
• COMPRESSOR PROTECTION
• LOW OIL PRESSURE PROTECTION
• CRANKCASE HEATERS
• COOLER PROTECTION
Relief Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
• HIGH-SIDE PROTECTION
• LOW-SIDE PROTECTION
• PRESSURE RELIEF VALVES
Other Safeties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
START-UP AND OPERATION . . . . . . . . . . . . . . . 65,66
Actual Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Operating Limitations . . . . . . . . . . . . . . . . . . . . . . . 65
Page
• TEMPERATURES
• VOLTAGE
• MINIMUM FLUID LOOP VOLUME
• FLOW RATE REQUIREMENTS
Operation Sequence . . . . . . . . . . . . . . . . . . . . . . . . 66
APPENDIX A - CCN TABLES . . . . . . . . . . . . . . 67-74
START-UP CHECKLIST . . . . . . . . . . . . . . CL-1 to CL-8
Unit sizes 230-420 are modular units which are shipped
as separate sections (modules A and B). Installation instruc-
tions specific to these units are shipped inside the individual
modules. See Table 1 for a listing of unit sizes and modular
combinations. For modules 230B-315B, follow all general
instructions as noted for unit sizes 080-110. For all remain-
ing modules, follow instructions for unit sizes 130-210.
This publication contains Start-Up, Service, Controls, Op-
eration, and Troubleshooting information for the 30GTN,R040-
420 liquid chillers with ComfortLink controls.
The 30GTN,R chillers are equipped with electronic ex-
pansion valves (EXVs) or, on size 040-110 FIOP (factory-
installed option) units, conventional thermostatic expansion
valves (TXVs). The size 040-110 FIOP chillers are also
equipped with liquid line solenoid valves (LLSV).
NOTE: TXVs are not available on modular units.
Differences in operations and controls between standard
and 040-110 FIOP units are noted in appropriate sections in
this publication. Refer to the Installation Instructions and the
Wiring Diagrams for the appropriate unit for further details.
This unit uses a microprocessor-based electronic con-
trol system. Do not use jumpers or other tools to short
out or bypass components or otherwise depart from
recommended procedures. Any short-to-ground of the
control board or accompanying wiring may destroy the
board or electrical component.
Table 1 - Unit Sizes and Modular Combinations
UNIT MODEL
30GTN,R
40
45
50
60
70
80
90
100
110
130
150
170
190
210
230
245
255
270
290
315
330
360
390
420
*60 Hz units/50 Hz units.
2
GENERAL
INTRODUCTION
NOMINAL SECTION A
TONS UNIT 30GTN,R
40 -
45 -
50 -
60 -
70 -
80 -
90 -
100 -
110 -
125 -
145 -
160 -
180 -
200 -
220 150
230 150
240 150
260 170
280 190
300 210
325 170
350 190
380 210
400 210
Page
SECTION B
UNIT 30GTN,R
-
-
-
-
-
-
-
-
-
-
-
-
-
-
080
090
100
100
110
110
170
190/170*
190
210