3
IOB (Input/Output Board)
The IOB is supplied from a 24 VAC supply reference to earth
ground.
IOB CONFIGURATION
The input/output boards are configured for different types of
input/output. The IOB boards have two dip switches. Switch 1
sets the board address. For Switch 2, if a channel output for
channel 1 through 10 (J16 and J15) is 4-20 mA, the corre-
sponding dip switch 1-10 must be On for the channel.
23XRV IOB COMPONENTS AND WIRING
The components listed in Tables 1-3 are available at the user’s
terminal block on the IOB. Many are routed to the 7TB terminal
block located on the left side of the low voltage VFD section.
For field connections the appropriate connectors are identified in
Tables 1-3. Figure 3 is the legend for the IOB and control wiring
diagrams; Fig. 4-6 show IOB wiring diagrams; and Fig. 7-9
show additional control wiring.
Table 1 — SIOB Input/Output Descriptions
DESCRIPTION CHANNEL TERMINAL TYPE OPTIONAL
Entering Chilled Water Temperature AI1 J25-1,2 5K Ohm —
Leaving Chilled Water Temperature AI2 J25-3,4 5K Ohm —
Entering Condenser Water Temperature AI3 J25-5,6 5K Ohm —
Leaving Condenser Water Temperature AI4 J25-7,8 5K Ohm —
Evaporator Saturation Temperature (Refrigerant Liquid Temperature) AI5 J25-9,10 5K Ohm —
Condenser Pressure Sensor AI6 J11-1,2,3 5VDC —
Evaporator Pressure Sensor AI7 J19-1,2,3 5VDC —
Economizer Pressure Sensor AI8 J20-1,2,3 5VDC —
Compressor Discharge Pressure Sensor AI9 J21-1,J19-3 5VDC —
Demand Limit Input AI10 J9-1,2 4-20 mA Optional Field Connections 7TB-7,8
Spare Safety DI2 J1-3,4 24 VAC Optional Field Connections, 7TB-3,4 (dry contact)
Ice Build Contact DI3 J1-5,6 24 VAC NOTE: 23XRV is not suited for ice duty.
Oil Reclaim Actuator AO1 J10-1,2 0 to 10V Variable
Primary Oil Heater Relay DO1 J2-1 24 VAC —
Oil Pump Relay DO2 J2-2 24 VAC —
Vaporizer Heater Relay DO3 J6-2 24 VAC —
Secondary Oil Heater Relay DO4 J6-1 24 VAC —
Hot Gas Bypass Solenoid DO5 J23-1,2 24 VAC —
Condenser Expansion Valve STRP1 J17-2,3,4,5 Stepper Motor NOTE: Only for units with TP Compressor
Economizer Expansion Valve STRP2 J18-2,3,4,5 Stepper Motor NOTE: Only for units with TP Compressor
Table 2 — 23XRV Input/Output Board 1 (IOB1) Connections
a,b.c
NOTE(S):
a. See Fig. 5 for IOB1 wiring diagram.
b. For pressure readings, only Vout (output) terminal is indicated. See Fig. 5 for Vin (+) and ground (–).
c. Defaults are shown. In some cases the IOB can be configured differently depending on job requirements.
DESCRIPTION CHANNEL TERMINAL TYPE OPTIONAL
Compressor Discharge Temperature AI1 J16-1,5 5K Ohm —
Motor Winding Temperature AI2 J16-2,6 5K Ohm —
Oil Vaporizer Temperature AI3 J16-3,7 5K Ohm —
Oil Sump Temperature AI4 J16-4,8 5K Ohm —
Remote Reset Sensor AI5 J15-6,12 5K Ohm Optional Field Connection 7TB-17, 18
Economizer Gas Temperature AI6 J15-5,11 5K Ohm —
Oil Pump Discharge Pressure AI7 J15-4,10 5V —
Oil Sump Pressure AI8 J15-3,9 5V —
Refrigerant Leak Sensor AI9 J15-2,8 4-20mA
Optional Field Connection 7TB-19, 20 (Ensure channel 5 on SW2 dip
switch is ON)
Auto Chilled Liquid Reset AI10 J15-1,7 4-20mA
Optional Field Connection 7TB-21, 22 (Ensure channel 9 on SW2 dip
switch is ON)
Head Pressure Output AO3 J14-3,6 4-20mA Optional Field Connection 7TB-34, 35
Remote Contact Input DI1 J13-1,5 24 VAC
Optional Field Connection 7TB-9,10, Dry contact.
Must be configured in "Configure Startup Options" in Chiller Start/Stop
Menu.
Emergency Stop DI2 J13-2,6 24 VAC Optional Field Connection 7TB-11,12; Dry contact
Evaporator Flow Switch DI3 J13-4,7 24 VAC Optional Field Connection 7TB-13,14; Closed indicates flow
Condenser Flow Switch DI4 J13-4,8 24 VAC Optional Field Connection 7TB-15,16; Closed indicates flow
Chiller Alert DO1 J12-6,7 24 VAC Optional Field Connection 7TB-24V, 27
Chiller Alarm DO2 J12-9,10 24 VAC Optional Field Connection 7TB-24V, 29
Discrete Chiller Run Status Output
(OFF=0V, ON=24VAC)
DO3 J12-1,2 24 VAC Optional Field Connection 7TB-24V, 31
VFD Run Permissive DO4 J12-4,5 24 VAC —
Condenser Liquid Level Sensor AI11 J10-1,7 0-5V NOTE: For TP compressors only.
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