Johnson Controls York YKN2Open board User Manual

In the event that more than one incident is produced, only the incident detected with the highest priority
is signalled, provided that it has not yet been restored. Inasmuch as they are restored, the other existing
incidents that have not yet been restored are displayed.
Flashes Type Incident
1, 2 or 3
1
1
Probes
Discharge probe open or short circuited
2 Liquid probe open or short circuited
3 Suction probe open or short circuited
2
1
Temperature
Repeated defrosting
2 The discharge temperature is not recovered
4
1
1
Probes
Supply probe open or short circuited
2 Return probe open or short circuited
3 Outdoor probe open or short circuited
4 Water probe open or short circuited
5 Fault in the enthalpy probes
2 1 Thermostat Signal Y1 without signal G
3
1
Auxiliary heat
Heating element thermal switch 1
2 Heating element thermal switch 2
3 Heating element thermal switch 3
4 Heating element thermal switch 4
4
1
Temperature
The water coil temperature is not recovered
2 Outdoor temperature too low
3 Water coil performing antifreeze operation
4 Supply temperature above 55 °C
5 Supply temperature below 25 °C with gas
5
1
Others
Defrost cycle
2 There is at least one accessory not found
3 Air quality demand
4 Dirty filters
5 Presence sensor is unoccupied
6 Suction temperatures < 0 °C with economiser
6
1
Recovery system
Energy recovery wheel motor trip switch
2 Energy recovery fan motor trip switch
Faults
Faults or lockouts stop the unit.
They are signalled by a red LED on the board using a thermostat and a relay is activated on the board.
N O T E
If there are no faults, the LED is switched off.
When a fault is produced, the LED passes through two flashing sequences.
1. The first indicates the affected compressor:
• One flash for stage 1.
• Two flashes for stage 2.
• Three flashes for stage 3.
• Four flashes if an accessory is concerned.
2. The second sequence is produced after a brief pause and indicates the fault detected.
3. There is a long pause and the sequence is produced again.
In the event that more than one alarm is produced, the incident detected with the highest priority that has
not yet been restored is signalled.
5
Malfunctions
5.2 Causes
22

Johnson Controls York YKN2Open board Specifications

General

Brand	Johnson Controls
Model	York YKN2Open board
Category	Controller
Language	English