Carrier XRV Specifications Page 15
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15
CONTROLS
Definitions
ANALOG SIGNAL — An analog signal varies in proportion
to the monitored source. It quantifies values between operating
limits. (Example: A temperature sensor is an analog device be-
cause its resistance changes in proportion to the temperature,
generating many values.)
DISCRETE SIGNAL — A discrete signal is a 2-position rep-
resentation of the value of a monitored source. (Example: A
switch produces a discrete signal indicating whether a value is
above or below a set point or boundary by generating an on/off,
high/low, or open/closed signal.)
General — The 19XRV hermetic centrifugal liquid chiller
contains a microprocessor-based control panel that monitors
and controls all operations of the chiller. See Fig. 8 and 9. The
microprocessor control system matches the cooling capacity of
the chiller to the cooling load while providing state-of-the-art
chiller protection. The system controls the cooling load within
the set point plus the deadband by sensing the leaving chilled
water or brine temperature and regulating the inlet guide vane
via a mechanically linked actuator motor. The guide vane is a
variable flow pre-whirl assembly that controls the refrigeration
effect in the cooler by regulating the amount of refrigerant
vapor flow into the compressor. An increase in guide vane
opening increases capacity. A decrease in guide vane opening
decreases capacity. The microprocessor-based controls protect
the chiller by monitoring the digital and analog inputs and
executing capacity overrides or safety shutdowns, if required.
PIC III System Components — The chiller control
system is called the PIC III (Product Integrated Control III).
See Table 1. The PIC III controls the operation of the chiller by
monitoring all operating conditions. The PIC III can diagnose a
problem and let the operator know what the problem is and
what to check. It promptly positions the guide vanes to
maintain leaving chilled water temperature. It can interface
with auxiliary equipment such as pumps and cooling tower
fans to turn them on when required. It continually checks all
safeties to prevent any unsafe operating condition. It also regu-
lates the oil heater while the compressor is off and regulates the
hot gas bypass valve, if installed. The PIC III controls provide
critical protection for the compressor motor and controls the
VFD. The PIC III can interface with the Carrier Comfort
Network
®
(CCN) system if desired. It can communicate with
other PIC I, PIC II, or PIC III equipped chillers and other CCN
devices.
The PIC III consists of 3 modules housed inside 3 major
components. The component names and corresponding control
voltages are listed below (also see Table 1):
• control panel
— all extra low-voltage wiring (24 v or less)
• power panel
— 115 vac control voltage (per job requirement)
— 115 vac power for oil heater and actuators
— up to 460 vac for oil pump power
• VFD cabinet
— chiller power wiring (per job requirement)
Table 1 — Major PIC III Components and
Panel Locations*
*See Fig. 5-11.
PIC III COMPONENT PANEL LOCATION
International Chiller Visual Controller
(ICVC) and Display
Control Panel
Chiller Control Module (CCM) Control Panel
Control Transformer Circuit Breakers
CB1, CB2
Control Panel
Oil Heater Contactor (1C) Power Panel
Oil Pump Contactor (2C) Power Panel
Hot Gas Bypass Relay (3C) (Optional) Power Panel
Control Transformers (T1, T2, T3) Power Panel
Temperature Sensors See Fig. 8.
Pressure Transducers See Fig. 8.
COOLER CHARGING
VALVE (HIDDEN)
CONTROL
PANEL
SPLIT RING
DIFFUSER
ACTUATOR
(OPTIONAL)
GUIDE VANE
ACTUATOR
OIL SUMP
PRESSURE
TRANSDUCER
POWER
PANEL
OIL SUMP
TEMPERATURE
SENSOR
OIL PUMP
DISCHARGE
PRESSURE
WATER
SENSOR
CABLES
HGBP
ACTUATOR
(OPTIONAL)
VFD COOLING
SOLENOID
VFD ENCLOSURE
EVAPORATOR SATURATION
TEMPERATURE SENSOR
(ON BOTTOM OF COOLER)
CONDENSER CHARGING
VALVE (HIDDEN)
CONDENSER
3-WAY SHUTOFF
VALVE
CONDENSER
PRESSURE
TRANSDUCER
WATER
SENSOR
CABLES
COOLER
PRESSURE
TRANSDUCER
Fig. 8 — Chiller Controls and Sensor Locations
a19-1730
- EVERGREEN 1
- 50/60 Hz 1
- CONTENTS 2
- CONTENTS (cont) 3
- INTRODUCTION 4
- CHILLER FAMILIARIZATION 5
- (Fig. 1 and 2) 5
- REAR VIEW 7
- FRONT VIEW 7
- REFRIGERATION CYCLE 8
- MOTOR AND LUBRICATING OIL 8
- COOLING CYCLE 8
- STARTING EQUIPMENT 10
- OPTIONAL 11
- 442A AND 608A VFDs 12
- 900A AND 1200A VFDs 12
- CONTROLS 15
- Definitions 15
- Fig. 10 — Control Panel 17
- Fig. 11 — Power Panel 17
- 55.1 44.1 40.7 20
- 85.0 95.0 98.1 20
- 21.8 132.9 93 20
- Table 4 — ICVC Display Data 27
- 0.1-3.0 SP_HIGH 28
- 0.1-3.0 SP_HIGH 1.0 37
- PIC III System Functions 40
- ECW-10 sec 41
- Error, Gain = 1 41
- Error, Gain = 3 41
- START-UP/SHUTDOWN/ 57
- RECYCLE SEQUENCE (Fig. 27) 57
- Local Start-Up — 57
- Shaft Packing — 60
- LIQUID LINE 63
- Temperature (F) 64
- Temperature (C) 64
- • Surge/ HGBP Deadband = 1 69
- ΔT increase 70
- Delta Tsat 71
- ALARM CONTROL 72
- ALARM ROUTING 72
- LEGEND TO TABLES 16A-16J 91
- E. START-UP IN PROGRESS 92
- F. NORMAL RUN 93
- G. NORMAL RUN WITH OVERRIDES 93
- H. OUT-OF-RANGE SENSOR 94
- J. CHILLER ALERTS 99
- J. CHILLER ALERTS (cont) 100
- Control Modules 107
- Notes on Module Operation 107
- RECTIFIER LED 109
- INVERTER LED 109
- Table 30 — Motor Voltage Code 129
- COMPRESSOR, TRANSMISSION AREA 130
- LOW SPEED SHAFT THRUST DISK 131
- LEGEND FOR FIG. 53-58 133
- SEE NOTE 134
- HOT GAS BYPASS 135
- HOT GAS BYPASS OPTION FOR 136
- NOTE: MOTOR OVERLOAD IS 143
- FACTORY PRE-SET 143
- DO NOT ADJUST 143
- COMBINED I/O 144
- TB1 − LF2 146
- TB3 − LF2 146
- VFD (cont) 147
- LEGEND FOR FIG. 60 148
- NOTES FOR FIG. 60 149
- NOTE 3.6 150
- LEGEND FOR FIG. 61 152
- NOTES FOR FIG. 61 153
- 19XRV CHILLERS 154
- STATUS VPF_STAT 163
- APPENDIX B — LEAD/LAG WIRING 165
- 19XRV Weekly Maintenance Log 168
- 19XRV Maintenance Log 169
- 19XRV Seasonal Shutdown Log 170
- 10's 171
- 1's 171
- — The LEDs indicate if the 175
- Table G — Network Points List 176
- INITIAL START-UP CHECKLIST 179
- No 180
- *If yes, determine cause 180
- DRAWINGS) 180
- 0.1 to 3.0 184
- CCN LOCAL RESET MENU 190
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