York YK-EP Operation And Maintenance Manual page 245

JP15
Applies a pull-up voltage to the COM3 + terminal.
IN: Not used.
•
OUT: Normal position - no bias applied.
•
JP16
Applies a pull-down voltage to the COM2 - terminal.
• IN: Not used.
• OUT: Normal position - no bias applied.
JP17
Applies a pull-up voltage to the COM2 + terminal.
• IN: Not used.
• OUT: Normal position - no termination applied.
JP18
Applies a 120 Ohm terminating resistor
IN: Not used.
•
OUT: Normal position - no bias applied.
•
JP19
Applies a pull-up voltage to the COM2 + terminal.
• IN: Not used.
• OUT: Normal position - no bias applied.
JP20
Applies a pull-down voltage to the COM3 - terminal.
IN: Not used.
•
OUT: Normal position - no bias applied.
•
JP21*
Shunt must be removed or hang on one pin
• Pins 1-2: Not used
• Pins 2-3: Not used
JP22*
Shunt must be removed or hang on one pin
• Pins 1-2: Not used.
• Pins 2-3: Not used.
YK-EP Style B Centrifugal Chiller 245