2
CONTENTS
Page
SAFETY CONSIDERATIONS
. . . . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2,3
MAJOR SYSTEM COMPONENTS
. . . . . . . . . . . . . . . . . . .3,4
General
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Main Base Board (MBB)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Scrolling Marquee Display
. . . . . . . . . . . . . . . . . . . . . . . . . . 3
Energy Management Module (EMM)
. . . . . . . . . . . . . . . . . 3
Enable/Off/Remote Contact Switch
. . . . . . . . . . . . . . . . . . 3
Emergency On/Off Switch
. . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Board Addresses
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Control Module Communication
. . . . . . . . . . . . . . . . . . . . 3
Sterlco
Comfort Network Interface
. . . . . . . . . .. . . . . . . . 3
OPERATING DATA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-46
Sensors
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
•
T1 — COOLER LEAVING FLUID SENSOR
•
T2 — COOLER ENTERING FLUID SENSOR
•
T7,T8 — COMPRESSOR RETURN GAS
TEMPERATURE SENSOR (ACCESSORY)
•
T9 — OUTDOOR-AIR TEMPERATURE SENSOR
•
T10 — REMOTE SPACE TEMPERATURE SENSOR OR
DUAL LEAVING WATER TEMPERATURE SENSOR
Energy Management Module
. . . . . . . . . . . . . . . . . . . . . . . 17
Loss-of-Cooler Flow Protection
. . . . . . . . . . . . . . . . . . . . 17
Thermostatic Expansion Valves (TXV)
. . . . . . . . . . . . . 17
Capacity Control
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
•
MINUTES LEFT FOR START
•
MINUTES OFF TIME
•
LEAD/LAG DETERMINATION
•
CAPACITY CONTROL OVERRIDES
Head Pressure Control
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Operation of Machine Based on Control Method
and Cooling Set Point Selection Settings
. . . . . . . . 22
Cooling Set Point Select
. . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Marquee Display Usage
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Service Test
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Optional Factory-Installed Hydronic Package
. . . . . . 24
Cooler Pump Control
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Cooler Pump Sequence of Operation
. . . . . . . . . . . . . . 24
Configuring and Operating Dual Chiller Control
. . . . 26
Temperature Reset
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Demand Limit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
•
DEMAND LIMIT (2-Stage Switch Controlled)
•
EXTERNALLY POWERED DEMAND LIMIT
(4 to 20 mA Controlled)
• DEMAND LIMIT (SCN Loadshed Controlled)
Cooling Set Point (4 to 20 mA)
. . . . . . . . . . . . . . . . . . . . . 45
TROUBLESHOOTING
. . . . . . . . . . . . . . . . . . . . . . . . . . . 46-57
Complete Unit Stoppage and Restart
. . . . . . . . . . . . . . 46
•
GENERAL POWER FAILURE
•
UNIT ENABLE-OFF-REMOTE CONTACT SWITCH IS
OFF
•
CHILLED FLUID PROOF-OF-FLOW SWITCH OPEN
•
OPEN HIGH-PRESSURE SWITCH(ES)
•
OPEN COMPRESSOR INTERNAL THERMAL
PROTECTION
•
OPEN 24-V CONTROL CIRCUIT BREAKERS
•
COOLING LOAD SATISFIED
•
THERMISTOR FAILURE
•
LOW SATURATED SUCTION
Alarms and Alerts
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
SERVICE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58-73
Electronic Components
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
•
CONTROL COMPONENTS
Compressor Replacement
. . . . . . . . . . . . . . . . . . . . . . . . . 58
Cooler
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
•
BRAZED-PLATE COOLER HEAT EXCHANGER
REPLACEMENT
•
BRAZED-PLATE COOLER HEAT EXCHANGER
CLEANING
Check Oil Charge
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Page
Condenser Section and Coils
. . . . . . . . . . . . . . . . . . . . . . 60
•
COIL CLEANING
•
CLEANING E-COATED COILS
•
CONDENSER SECTION
Check Refrigerant Feed Components
. . . . . . . . . . . . . . 61
•
THERMOSTATIC EXPANSION VALVE (TXV)
•
FILTER DRIER
•
MOISTURE-LIQUID INDICATOR
•
MINIMUM LOAD VALVE
•
PRESSURE RELIEF DEVICES
Compressor and Unit Protective Devices
. . . . . . . . . . 62
•
MANUAL STARTER
•
COMPRESSOR INTERNAL THERMAL PROTECTION
Check Unit Safeties
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
•
HIGH-PRESSURE SWITCH
•
PRESSURE TRANSDUCERS
•
COOLER FREEZE-UP PROTECTION
•
HEATER CABLE
•
WINTER SHUTDOWN
Thermistors
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Pressure Transducers
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Flow Sensor
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Strainer
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Motormaster® V Controller
. . . . . . . . . . . . . . . . . . . . . . . . 68
•
GENERAL OPERATION
•
SET POINTS
•
INSTALLATION
•
PROGRAMMING
•
EPM CHIP
•
LIQUID LINE PRESSURE SET POINT ADJUSTMENT
• LOSS OF SCN COMMUNICATIONS
•
REPLACING DEFECTIVE MODULES
Hydronic Package
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
MAINTENANCE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Recommended Maintenance Schedule
. . . . . . . . . . . . 74
PRE-START-UP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
System Check
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
START-UP AND OPERATION
. . . . . . . . . . . . . . . . . . . . .74-76
Actual Start-Up
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Check Refrigerant Charge
. . . . . . . . . . . . . . . . . . . . . . . . . 75
Operating Limitations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
•
TEMPERATURES
•
LOW AMBIENT OPERATION
•
VOLTAGE — ALL UNITS
OPERATION SEQUENCE
. . . . . . . . . . . . . . . . . . . . . . . . . . . 76
APPENDIX A —
S
CN TABLES
. . . . . . . . . . . . . . . . . . . .77-88
APPENDIX B — FACTORY SETTINGS FOR
COMPRESSOR, FAN, PUMP AND MANUAL
STARTERS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89,90
APPENDIX C — BUILDING INTERFACE
. . . . . . . . . . 91,92
START-UP CHECKLIST FOR 30RA LIQUID
CHILLER
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CL-1-CL-8
GENERAL
This publication contains Controls Start-Up, Service, Oper-
ation, and Troubleshooting information for the 30RA
AquaSnap® air-cooled chillers. See Table 1. These chillers are
equipped with ComfortLink™ controls and conventional
thermostatic expansion valves (TXVs).
This unit uses a microprocessor-based electronic control
system. Do not use jumpers or other tools to short out or
bypass components or otherwise depart from recom-
mended procedures. Any short-to-ground of the control
board or accompanying wiring may destroy the board or
electrical component.
Summary of Contents for AquaSnap 30RA010
Page 6: ...6 Fig 1 Typical Control Box for 30RA010 030 022 030 Shown ...
Page 7: ...7 Fig 2 Typical Control Box for 30RA032 055 042 055 Shown ...
Page 8: ...8 Fig 3 Wiring Schematic 30RA010 018 30RA010 018 AQUA SNAP ...
Page 10: ...10 Fig 4 Wiring Schematic 30RA022 030 30RA022 030 AQUA SNAP ...
Page 11: ...11 Fig 4 Wiring Schematic 30RA022 030 cont AQUA SNAP LOW VOLTAGE CONTROL SCHEMATIC 022 030 ...
Page 12: ...12 Fig 5 Wiring Schematic 30RA032 040 30RA032 040 AQUA SNAP ...
Page 13: ...13 Fig 5 Wiring Schematic 30RA032 040 cont AQUA SNAP LOW VOLTAGE CONTROL SCHEMATIC 032 040 ...
Page 14: ...14 Fig 6 Wiring Schematic 30RA042 055 30RA042 055 AQUA SNAP ...
Page 15: ...15 Fig 6 Wiring Schematic 30RA042 055 cont AQUA SNAP LOW VOLTAGE CONTROL SCHEMATIC 042 055 ...
