Carrier AquaEdge 23XRV Start-Up, Operation And Maintenance Instructions Manual page 21

1. Cable
2. Glass Seal
3. Motor Housing
4. Stepper Motor
5. Bearing
6. Lead Screw
7. Insert
8. Valve Piston
9. Valve Seat
10. Valve Port
MAIN EXV
Fig. 21 — Cutaway Views of Electronic Expansion Valves (EXV) (P Compressor Only)
Table 2 — Major PIC6 Control Components and
Panel Locations
PIC6 COMPONENT
HMI (human-machine interface) and Display
VFD Power Module
Starfire Input/Output Board (SIOB)
Input/Output Board (IOB)
Oil Heater Contactor, 500W (1C)
Oil Heater Contactor (2nd stage), 1000 W (5C)
Oil Pump Contactor (2C)
Hot Gas Bypass Relay (3C) (Optional)
Control Transformers (TR1)
Control Transformer Circuit Breaker (CB-1)
Temperature Sensors
Condenser Level Sensor
Pressure Transducers
Vaporizer Heater Contactor (6C)
Auxiliary Control Module
PIC6 HMI
The PIC6 HMI is the "brain" of the PIC6 control system. This
module contains all the primary software needed to control the
chiller. The HMI is the input center for all local chiller set points,
schedules, configurable functions, and options. The HMI is a
touchscreen controller and is mounted to the inside of the control
panel door near the bottom right of the enclosure (when facing the
unit and door is closed). See Fig. 2-4 and Fig. 16.
INPUT OUTPUT BOARDS (IOB)
The 23XRVchillder has two IOBs. The 1IOB is the first board
from the left, followed by 2IOB. The IOBs functions as the input
and output interface for the HMI.
STARFIRE INPUT OUTPUT BOARD (SIOB)
The SIOB card follows the 2IOB. It provides control output sig-
nals and control input signals for the HMI to process. The SIOB
board contains all EXV outputs.
This module is located on the control panel in the control center.
Both the SIOB and the IOBs provide the input and outputs nec-
essary to control the chiller. These modules monitor refrigerant
pressure, entering and leaving liquid temperatures and pressures,
and outputs control for the oil reclaim valve, oil heaters, and oil
pump. The SIOB and IOBs are the connection point for optional
demand limit, automatic chilled liquid reset, 4 to 20 mA kW out-
put, remote temperature reset, and refrigerant leak sensor.
FIELD WIRING TERMINAL BLOCK (7TB)
Key inputs and outputs are terminated at the field wiring termi-
nal block (7TB). 7TB contains low voltage input / outputs such
PANEL LOCATION
as remote start contact, spare safety, 4-20 mA head pressure out-
Control Center Door
put, flow switch inputs, Chiller Run Status, pressure options etc.
Inside Control Center
See wiring diagram for specific terminations.
Control Panel
VFD POWER MODULE
Control Panel
Control Panel
This module is located in the control center. The power module
Control Panel
converts AC power to DC power and manages the pulse-width-
Control Panel
modulation signals to the motor for VFD operation based on speed
Control Panel
signal from the PIC6 HMI.
Control Panel
VFD GATEWAY MODULE
Control Panel
See Fig. 5-7 and 14
The VFD Gateway Module translates the protocols between
See Fig. 5
the PIC 6 HMI and VFD. This module is a standard
See Fig. 5-7 and 15
20-COMM-H RS-485 adapter. Module is set for Modbus RTU
Control Panel
communication, 32-bit mode.
Near PD-4 EXV Board
OIL HEATER CONTACTOR (1C)
This contactor is located on the control panel (Fig. 20) and op-
erates the heater at 115 V. It is controlled by the PIC6 control
system to maintain oil temperature during chiller shutdown or
to keep the oil sump temperature at an acceptable level.
OIL PUMP CONTACTOR (2C)
This contactor is located in the control panel (Fig. 20) and oper-
ates the oil pump. The oil pump is controlled by the PIC6 to pro-
vide oil pressure during pre-lube and when the chiller is starting
or running.
HOT GAS BYPASS CONTACTOR RELAY (3C)
This relay, located in the power panel, controls the opening of the
hot gas bypass valve. The PIC6 energizes the relay based on hot
gas bypass algorithm settings.
SECOND STAGE OIL HEATER CONTACTOR (5C)
This contactor is located in the control panel (Fig. 20), and is acti-
vated by PIC6 to maintain oil quality at low temperature.
VAPORIZER HEATER CONTACTOR (6C)
This contactor is located in the control panel (Fig. 20) and energiz-
es the surface mounted heater on the bottom of the vaporizer.
CONTROL TRANSFORMER (TR1)
Transformer TR1 converts incoming control voltage to 24 vac
power for the Ethernet switch, SIOB, IOBs, and HMI.
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ECONOMIZER EXV (OPTION)