Carrier XRV, 19XR Major PIC II Components and Panel Locations, Pressure Transducers, Typical

The PIC II can interface with the Carrier Comfort Network (CCN) if desired. It can communicate with other PIC I or PIC II equipped chillers and other CCN devices.

The PIC II 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

—230 or 115 v control voltage (per job requirement)

—up to 600 v for oil pump power

•starter cabinet

—chiller power wiring (per job requirement)

Table 1 — Major PIC II Components and

Panel Locations*

PIC II COMPONENT	PANEL LOCATION
Chiller Visual Controller (CVC/ICVC) and	Control Panel
Display
Integrated Starter Module (ISM)	Starter Cabinet
Chiller Control Module (CCM)	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)	Power Panel
Temperature Sensors	See Fig. 9.
Pressure Transducers	See Fig. 9.
*See Fig. 8-13.

CHILLER VISUAL CONTROLLER (CVC) — The CVC is the “brain” of the PIC II. This module contains all the operating software needed to control the chiller. The CVC is mounted to the control panel (Fig. 12) and is the input center for all local chiller set points, schedules, configurable functions, and op- tions. The CVC has a stop button, an alarm light, four buttons for logic inputs, and a backlight display. The backlight will au- tomatically turn off after 15 minutes of non-use. The functions of the four buttons or “softkeys” are menu driven and are shown on the display directly above the softkeys.

The viewing angle of the CVC can be adjusted for optimum viewing. Remove the 2 bolts connecting the control panel to the brackets attached to the cooler. Place them in one of the holes to pivot the control panel forward to backward to change the viewing angle. See Fig. 12. To change the contrast of the display, access the adjustment on the back of the CVC. See Fig. 12.

INTERNATIONAL CHILLER VISUAL CONTROLLER (ICVC) — Incorporates all of the functions and operating soft- ware of the CVC with the added feature of 4 factory pro- grammed languages:

English (default) Chinese Japanese Korean

NOTE: Pressing any one of the four softkey buttons will acti- vate the backlight display without implementing a softkey function.

INTEGRATED STARTER MODULE (ISM) — This mod- ule is located in the starter cabinet. This module initiates com- mands from the CVC/ICVC for starter functions such as start- ing and stopping the compressor, condenser, chilled water pumps, tower fan, spare alarm contacts, and the shunt trip. The ISM monitors starter inputs such as line voltage, motor current,

ground fault, remote start contact, spare safety, condenser high pressure, oil pump interlock, starter 1M, and run contacts. The ISM contains logic capable of safety shutdown. It shuts down the chiller if communications with the CVC/ICVC are lost. The ISM can also act as the interface for PIC II to the VFD controller.

CHILLER CONTROL MODULE (CCM) — This module is located in the control panel. The CCM provides the input and outputs necessary to control the chiller. This module monitors refrigerant pressure, entering and leaving water temperatures, and outputs control for the guide vane actuator, oil heaters, and oil pump. The CCM is the connection point for optional de- mand limit, chilled water reset, remote temperature reset, re- frigerant leak sensor and motor kilowatt output.

OIL HEATER CONTACTOR (1C) — This contactor is lo- cated in the power panel (Fig. 13) and operates the heater at either 115 or 230 v. It is controlled by the PIC II to maintain oil temperature during chiller shutdown. The XR4 with split ring diffuser has a line voltage oil heater. Refer to the control panel wiring schematic.

OIL PUMP CONTACTOR (2C) — This contactor is located in the power panel. It operates all 200 to 575-v oil pumps. The PIC II energizes the contactor to turn on the oil pump as necessary.

HOT GAS BYPASS CONTACTOR RELAY (3C) (Optional) — This relay, located in the power panel, controls the opening of the hot gas bypass valve. The PIC II energizes the relay during low load, high lift conditions.

CONTROL TRANSFORMERS (T1, T2) — These transform- ers convert incoming control voltage to 24 vac power for the 3 power panel contactor relays, CCM, and CVC/ICVC.

OPTIONAL TRANSFORMER (T3) — This transformer pro- vides control power to Dataport™/DataLINK™ modules.

Fig. 10 — Control Sensors (Temperature)

Fig. 11 — Control Sensors

(Pressure Transducers, Typical)

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