Communications With The Thermostat - Johnson Controls York YKN2Open board Technical Information

The outside probe can be fitted in the J6 of the board of the first compressor, or in the J3 of the economiser
board.
Whenever the economiser accessory is fitted, the system searches for the outside probe in the
economiser as a first option.
A table with the configuration of probes is provided below.
Connector
Probe
Colour
Discharge White
Liquid green
Outdoor
Orange
YKN2Open
Suction Black
Supply
Red
YKN2Open
Supply
Orange
2nd Compressor
Economiser
Black
Return
Water entry Black
Economiser
White
Outdoor
The unit will be fitted with a Discharge, Liquid and Suction probe per cooling circuit.

3.1.3 Communications with the thermostat

The board program will attempt to operate with the thermostat via communications. If they are lost it will
be able to operate with the thermostat relay signals. If there is no communication with the thermostat, a
new communication is made every minute. If communication with the thermostat is restored, operation
modes are switched to work with the thermostat using communications; failing this, acknowledgement
of the relay signals is continued.
The board will be able to detect and communicate with a DPC-1 or DPC-1R thermostat.
PUMP
Obligatory Optional
X
X
X
X
X
X
X
X
X
Configuration
Configuration
COLD
Obligatory Optional
X
X
X
X
X
X
X
X
X
3
3.1
7