Table Of Contents - Johnson Controls York YKN2Open board Technical Information

Index
1 Components.............................................................................................................................1
1.1 Description of the components.................................................................................................2
2 Buttons and LEDs....................................................................................................................3
2.1 Buttons and LEDs....................................................................................................................4
2.1.1 Test button...............................................................................................................................4
2.1.2 LEDs.........................................................................................................................................4
3 Configuration............................................................................................................................5
3.1 Configuration............................................................................................................................6
3.1.1 Microswitches...........................................................................................................................6
3.1.2 Accessories and Probes...........................................................................................................6
3.1.3 Communications with the thermostat.......................................................................................7
4 Operation.................................................................................................................................8
4.1 General considerations............................................................................................................9
4.2 Demand control unit.................................................................................................................9
4.2.1 With DPC1 thermostat............................................................................................................10
4.2.2 With external control...............................................................................................................10
4.3 Switching of the main components........................................................................................10
4.3.1 Indoor fan...............................................................................................................................10
4.3.2 Outdoor fan............................................................................................................................11
4.3.3 Four-way valve.......................................................................................................................11
4.3.4 Compressor............................................................................................................................12
4.4 Defrost....................................................................................................................................12
4.4.1 Start-up...................................................................................................................................12
4.4.2 Switching................................................................................................................................13
4.4.3 Finish......................................................................................................................................13
4.5 Switching of the accessories..................................................................................................13
4.5.1 Second and third compressors...............................................................................................13
4.5.2 Presence detector..................................................................................................................13
4.5.3 Electrical auxiliary heat...........................................................................................................14
4.5.4 Gas auxiliary heat...................................................................................................................14
4.5.5 Auxiliary heat via hot water coil..............................................................................................14
4.5.6 Economiser, return fan and air quality detector......................................................................15
4.5.7 Energy recovery system.........................................................................................................16
4.5.8 Smoke and high temperature detector...................................................................................17
4.5.9 Dirty filter detector..................................................................................................................17
5 Malfunctions...........................................................................................................................18
5.1 Malfunctions...........................................................................................................................19
Index
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