General; Abbreviations Used In This Manual; Hardware; Main Control Board - Carrier AquaEdge 19DV Controls Operation And Troubleshooting

GENERAL

This publication contains operation and troubleshooting infor-
mation for PIC (Product Integrated Control) 6, a system for
controlling 19DV semi-hermetic centrifugal liquid chillers.
This publication is based on 19DVPIC6.
The PIC6 control system monitors and controls all operations
of the chiller. The microprocessor control system matches the
capacity of the chiller to the cooling load while providing state-
of-the-art chiller protection. The system controls cooling load
within the set point plus or minus the dead band by sensing the
water or brine temperature and regulating the inlet guide vane
via a mechanically linked actuator motor, and regulating VFD
(variable frequency drive) speed of the compressor. The guide
vane is a variable flow pre-whirl assembly that controls the re-
frigeration effect in the evaporator 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
control center protects the chiller by monitoring the digital and
analog inputs and executing capacity overrides or safety shut-
downs as necessary.
The PIC6 control system also provides access to a Control Test
function covering all outputs except compressor relay outputs.
NOTE: This software is shared between multiple product families
and therefore not all points indicated in the tables are applicable to
19DV or 19XR as configured. For instance 19DV is not an oil lu-
bricated machine, so any reference to oil in the software tables
would not be applicable for 19DV.

Abbreviations Used in This Manual

The following abbreviations are used in this manual:
AWG American Wire Gage
—
CCM Chiller Control Module
—
CCN mode Operating mode: CCN
—
CCN Carrier Comfort Network
—
DHCP Dynamic Host Configuration Protocol
—
DSH Discharge Superheat
—
EC Envelope Control (Hot Gas Bypass)
—
ECDW Entering Condenser Water
—
ECW Entering Chilled Water
—
EWT Entering Water Temperature
—
HGBP Hot Gas Bypass
—
HMI Human Machine Interface
—
I/O Input/Output
—
IOB Input/Output Board
—
LCDW Leaving Condenser Water
—
LCW Leaving Chilled Water
—
LED Light-Emitting Diode
—
LEN Local Equipment
—
MCB

Main Control Board

—
NIC Network Interface Card
—
PIC Product Integrated Control
—
RLA Rated Load Amps
—
RTD Resistance Temperature Detector
—
SIOB Starfire Input/Output Board
—
TFT Thin Film Transistor
—
UI User Interface
—
VFD Variable Frequency Drive
—

HARDWARE

The PIC6 control system consists of one main control board,
an input/output board (IOB) for purge control, and four IOB
modules. All boards communicate via an internal Local Equip-
ment Network (LEN) bus.
Main Control Board
The main control board is supplied from a 24 VAC supply refer-
ence to earth ground. In the event of a power supply interrupt,
the unit restarts automatically without the need for an external
command. However, any faults active when the supply is inter-
rupted are saved, and may in certain cases prevent a circuit or
unit from restarting. Figure 1 shows the main control interface
and connectors.
®
LEGEND
J1 — USB CONNECTOR
J5 — USB CONNECTOR
J6 — LEN CONNECTOR
J7 — CCN CONNECTOR
J8 — RS485, BACnet MS/TP OR Modbus RTU
J9 — RNET (future)
J10 — RS485
J11 — USB CONNECTOR
J14 — POWER SUPPLY CONNECTOR (24 VAC)
ETHERNET CONNECTOR, PORT 0 (DEFAULT
J15 —
IP: 169.254.1.1, Mask: 255.255.0.0)
J16 — ETHERNET CONNECTOR, PORT 1 (DEFAULT
IP: 192.168.100.100, mask: 255.255.255.0)
NOTES:
1. Either BACnet/MSTP or BACnet/IP can be enabled and either
Modbus/RTU or Modbus/TCP/IP can be enabled. Controller does
not allow both to be enabled at the same time.
2. Modbus RTU can be configured simultaneously with BACnet IP.
3. BACnet MS/TP can be configured simultaneously with Modbus
TCP/IP.
Fig. 1 — PIC6 Connectors
Maintain the correct polarity when connecting the power sup-
ply to the boards. Otherwise, the boards may be damaged.

SIOB (Starfire Input/Output Board)

The SIOB is the purge control module, supplied from a 24VAC
supply reference to earth ground.

IOB (Input/Output Board)

The IOB is supplied from a 24 VAC supply reference to earth
ground.
IOB CONFIGURATION
The input/output boards can be configured for different types
of input/output. If an input or output type is supported for the
specific channel then it can be modified in the Configuration
Menu as shown in Table 1.
2
CAUTION