Control Inputs/Outputs; Table 24 - I/O Digital Inputs; Table 25 - I/O Digital Outputs; Table 26 - I/O Analog Inputs - York YLUA0248 Series Installation Operation & Maintenance

Air-cooled scroll condensing units
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FORM 150.73-NM2
ISSUE DATE: 09/07/2020
The digital inputs will display the input connection and
ON/OFF status such as:
F L O W
S W / R E M
J 13 - 5
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 = +30VDC unregulated input, OFF =
0VDC input on digital inputs).

CONTROL INPUTS/OUTPUTS

Tables 26 through 29 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 & 6 Comp. Units
J13-4
Load Limit Stage 1
J13-5
SYS 1 Zone Thermostat
J13-6
SYS 2 Zone Thermostat
Single System Select
J13-7
(Jumper = Single Sys, No Jumper = Two Sys)
CR1
J13-8
(Sys 1 Motor Protector/High Pressure Cutout)
CR2
J13-10
(Sys 2 Motor Protector/High Pressure Cutout)
JOHNSON CONTROLS
S T A R T
I S
O N
SECTION 9 – SERVICE AND TROUBLESHOOTING

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
Unit Type: Chiller = NO Jumper J11-12 to +24 VDC
J11-12
YLUA Condensing Unit = Jumper J11-12 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
9
137

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