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Lists and categorizes the unit's sensors and actuators.
Details the function of test buttons and signalling diodes (LEDs).
Explains system configuration checks: microswitch reading, thermostat communication, and accessory verification.
Details how microswitch positions configure the system.
Describes the use and search/configuration of accessories and probes.
Explains communication attempts with thermostats and compatible models.
Discusses general operational principles, start-up/stop sequences, and power failure handling.
Explains the unit's decision-making for stage activation based on priority.
Describes the operation of main components like indoor fan, outdoor fan, and 4-way valve.
Details compressor control, start-up sequences, and tandem operation.
Describes the control and operation of various accessories.
General| Brand | Johnson Controls |
|---|---|
| Model | York YKN2Open board |
| Category | Controller |
| Language | English |
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