Johnson Controls York YKN2Open board User Manual

• With the thermostat in OFF mode, the valve is deactivated independently of SW6. The 4-way valve
only activates when its corresponding compressor is activated.
– When the stage is deactivated, the compressor (V4VTICMP) is deactivated at the same time, as
is also the 4-way valve 60 seconds later.
• In the event that a fault is caused in the high-pressure switch, first the compressor is stopped and
then 60 seconds later the valve.
4.3.4 Compressor
N O T E
[See the operating parameters in the section Rooms, see on page 25].
One, two or three stages (SW4OFF)
One, two or three stages can be controlled.
When the compressor is started, initially the outdoor fan is started and then the compressor starts. In
order to prevent the compressor and the outdoor fan from starting up successively, a minimum of 4
minutes stoppage is timed (CMPTION) between start-ups.
In units with more than one stage, the compressor to start up as the first compressor is that which has
the least operating hours. The following compressors start up in accordance with demand.
• There must be a delay of 5 seconds (MAQTICMP_CMP) between compressor start-ups.
When it is necessary to stop one of the compressors, the compressor with the most amount of operating
hours is stopped.
In the heat cycle, if the outdoor temperature is lower than ‑10 °C (CMPTPEXT_OFF), the compressor is
stopped and an incident is indicated. It starts up again when the outdoor temperature is higher than ‑8 °C
(CMPTPEXT_ON).
Compressor in tandem (SW4ON)
Maximum of two circuits with tandem (2 compressors per circuit).
The compressor to start up as the first compressor is that which has the least operating hours. At the
moment when it is necessary to stop one of the compressors, the compressor with the most amount of
operating hours is stopped.
4.4 Defrost
N O T E
[See the operating parameters in the section Rooms, see on page 25].
The defrost is only carried out in heat pump operation mode.
An incident is indicated.
4.4.1 Start-up
The following conditions must be met:
• Compressor operating.
• Liquid probe temperature lower than ‑3 °C (DFRTPINICIO) during 3 minutes (DFRTICONF) or during
5 minutes (DFRTICONF2) if the outside temperature is less than or equal to ‑5 °C (DFRTPEXT).
• Time since the last 30, 60 or 90 minute-defrost (TIDES) expired.
N O T E
The time can be selected by SW1 and SW2.
4
Operation
4.4 Defrost
12

Johnson Controls York YKN2Open board Specifications

General

Brand	Johnson Controls
Model	York YKN2Open board
Category	Controller
Language	English