Controls Outputs; Connections At The User's Terminal Block - Carrier PIC 5+ User Manual

3.3 - Controls Outputs

Evaporator / Condenser water pump
The controller can regulate an optional evaporator /
condenser water pump.
Inlet Guide Vane
The Inlet Guide vane (IGV) is used to adjust the refrigerant
vapor flow into compressor to change in the operating
conditions of the machine. To adjust the refrigerant flow, the
guide vane moves open or close to vary the cross-section of
the refrigerant path. The high degree of accuracy with which
the guide vane is positioned ensures that the flow of
refrigerant is precisely controlled.
Economizer Damper valve (used for NGC chiller or the
chiller which is equipped with electrical damper valve)
The economizer damper control positions the economizer
damper valve open or closed to maintain a minimum
refrigerant pressure difference between the evaporator and
economizer.
Damper vapor source solenoid valve (used for 19XRC)
Damper vapor sorce solenoid valve adjusts the pressure
difference between Economizer and Evaporator according
to pressure difference between damper cap and flow passage.
EC Valve
The envelope control function is used to artificially load the
chiller and keep it running under low load conditions or to
prevent surge conditions. Since this also reduces the operating
efficiency of the machine, this is a user selectable option.
VFD
The VFD allows compressor start-up and capacity control
by modifying the motor frequency. The aviator continually
monitors many compressor parameters in order to ensure its
protection. If a problem occurs, the frequency aviator triggers
an alarm and, if necessary, stops the compressor.
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3.4 - Connections at the User's Terminal Block

The components listed below are available at the user's
terminal block on the IOB. Some of them can only be used
if the unit operates in the remote operating type (Remote
mode).
The following table summarizes the connections at the I/O
boards.
19XR6/7 I/O Mapping:
Description Channel #
Entering Chilled AI1
Water Temperature
Leaving Chilled Water AI2
Temperature
Entering Condenser AI3
Water Temp
Leaving Condenser AI4
Water Temp
Evap. Refrigerant AI5
Liquid Temperature
Comp Discharge AI6
Temperature
Condenser Pressure AI7
Evaporator Pressure AI8
Economizer Pressure AI9
FS VFD Load Current AI10
Chiller Status AO1
Output mA
Oil EXV Output AO2
(4-20ma)
Evap Wate DI1
Flow Switch
Cond Water DI2
Flow Switch
Remote Contact Input DI3
Remote Emergency DI4
Stop Input
Stage 1 IGV Increase DO1
Stage 1 IGV DO2
Decrease
Chiller Alarm Relay DO3
Chiller Alert Relay DO4
Motor Winding AI1
Temperature 1
Motor Winding AI2
Temperature 2
Motor Winding AI3
Temperature 3
Oil Supply AI4
Temperature
Oil Sump AI5
Temperature
Oil Supply Pressure AI6
Oil Sump Pressure AI7
Auto Demand Limit AI8
Input
Refrigerant Leak AI9
Sensor
Displacement Switch AI10
Guide Vane1 Output AO1
Damper Valve DI1
Feedback Fully Open
Board # Option
IOB1
IOB1
IOB1
IOB1
IOB1
IOB1
IOB1
IOB1
IOB1
IOB1 For Freestanding VFD
option
IOB1 User option, 4~20mA
4mA=OFF 8mA=Tripout
12mA=Shutdown
20mA=Running
IOB1 Factory option, 4~20mA
IOB1 User option, dry contact,
"Closed" indicates "FLOW"
IOB1 User option, dry contact,
"Closed" indicates "FLOW"
IOB1 User option, dry contact,
"Closed" indicates Turn ON
the chiller
IOB1 User option, dry contact,
"Closed" indicates chiller
emergency stop
IOB1 Used for ON/OFF type
guide vane actuator
IOB1 Used for ON/OFF type
guide vane actuator
IOB1 User option, 24VAC output,
recommend with external
power supply
IOB1 User option, 24VAC output,
recommend with external
power supply
IOB2
IOB2
IOB2
IOB2 Factory option
IOB2
IOB2
IOB2
IOB2 User option, 4~20mA
IOB2 User option, 4~20mA
IOB2
IOB2
IOB2