JOHNSON CONTROLS
149
SECTION 9 – SERVICE AND TROUBLESHOOTING
Form 150.63-NM9
Issue date: 5/20/2021
9
sure input is connected to plug 7 – pin 10 (J7-10) on
the I/O board. It indicates that the voltage is 2.1 VDC
which corresponds to 81 psig (5.6 barg) suction pres-
sure.
The digital inputs will display the input connection and
ON/OFF status such as:
F L O W S W / R E M S T A R T
J 13 - 5 I S O N
This indicates that the flow switch/remote start input is
connected to plug 13- pin 5 (J13-5) on the microboard,
and is ON (ON = +30 VDC unregulated input, OFF =
0 VDC input on digital inputs).
Control inputs/outputs
Table 24 to Table 27 are a quick reference list provid-
ing the connection points and a description of the in-
puts and outputs respectively. All input and output con-
nections pertain to the connections at the microboard.
Table 24 - I/O Digital Inputs
J13-2 Unit ON/OFF Switch
J13-3 Load Limit Stage 2 on 3, 5 and 6 Comp. Units
J13-4 Load Limit Stage 1
J13-5 SYS 1 Zone Thermostat
J13-6 SYS 2 Zone Thermostat
J13-7
Single System Select
(Jumbefore= Single Sys, No Jumbefore= Two
Sys)
J13-8
CR1
(Sys 1 Motor Protector/High Pressure Cutout)
J13-10
CR2
(Sys 2 Motor Protector/High Pressure Cutout)
Table 25 - I/O Digital Outputs
TB7-2 SYS 1 Compressor 1
TB7-3 SYS 1 Liquid Line Solenoid Valve
TB7-4 SYS 1 Compressor 2
TB7-5 SYS 1 Compressor 3
TB7-7 SYS 1 Hot Gas Bypass Valve
TB10-2 SYS 2 Compressor 1
TB10-3 SYS 2 Liquid Line Solenoid Valve
TB10-4 SYS 2 Compressor 2
TB10-5 SYS 2 Compressor 3
TB7-8 SYS 1 Condenser Fan Output 1
TB7-9 SYS 1 Condenser Fan Output 2
TB7-10 SYS 1 Condenser Fan Output 3
TB10-8 SYS 2 Condenser Fan Output 1
TB10-9 SYS 2 Condenser Fan Output 2
TB10-10 SYS 2 Condenser Fan Output 3
TB8-2 Evaporator Heater
TB8-3 SYS 1 Alarm
TB9-2 SYS 2 Alarm
TB8-6 & 7 Evaporator Pump Starter
TB10-7 SYS 2 Hot Gas Bypass Valve
Table 26 - I/O Analog Inputs
J7-10 SYS 1 Suction Transducer
J11-12
Unit Type: Chiller = NO JumbeforeJ11-12 to +24
VDC
YCUL Condensing Unit = JumbeforeJ11-12 to +24
VDC (Do NOT Use)
J7-11 SYS 1 Discharge Pressure Transducer (Optional)
J6-9 Ambient Air Temp. Sensor
J6-7 Leaving Chilled Liquid Temp. Sensor (Not Used)
J6-8 Discharge Air Temp Sensor
J9-10 SYS 2 Suction Pressure Transducer
J9-11 SYS 2 Discharge Pressure Transducer
J7-12 Unit/SYS 1 Voltage
J9-12 SYS 2 Voltage
Table 27 - I/O Analog Outputs
N/A Not Applicable
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