Economiser, Return Fan And Air Quality Detector - Johnson Controls York YKN2Open board Technical Information

There is a 15 °C minimum air supply temperature trip switch when this accessory is fitted. Hence, it is
possible to avoid the discomfort that may be created when there is a very high percentage at low outdoor
temperatures and the indoor fan is running continuously. In the event of a demand for cold, the water
coil valve closes.
• If the opening is more than 20% (BACPCPMP_ON), the pump relay is activated.
• If the opening is less than 5% (BACPCPMP_OFF), the relay is deactivated.
When the water temperature is lower than 3 °C (BACTPDFR_ON), the pump and the valve are activated
until the water temperature rises above 6 °C (BACTPDFR_OFF) in order to protect the hot water
accumulator and heating coil from the risk of freezing. This protection is activated while the fan is stopped,
even if the unit is stopped or in lockout.
There is a potentiometer on the control board that allows for the valve to be modulated by hand to check
its correct working order.
The valve returns to its operating position after 30 seconds (MAQTIMAN), which indicates the maximum
time that the unit operates in manual mode, or when the test button is pressed.
The yellow LED on the electronic module lights up and switches off if the water temperature is less than
3 °C (BACTPDFR_ON).
Jumper S2 is present on the board, which has a higher priority than the compressors if the hot water coil
is activated. This is recommended for installations where very cheap hot water is available.
The water temperature probe must be connected to the J13 connector.

4.5.6 Economiser, return fan and air quality detector

N O T E
[See the operating parameters in the section Rooms, see on page 25].
Allows for cold to be generated by modulating the outdoor air inlet damper. If the conditions are
favourable, the damper is modulated in order to achieve the lowest possible supply temperature, without
dropping below 11.5 °C (BACTPIMP_MAX).
In temperature mode, favourable conditions are deemed as follows:
• The outdoor temperature is lower than 20 °C (ECOTPEXT_MAXLOW)
• The outdoor temperature is lower than the return temperature.
In order to operate in enthalpy mode, it is necessary for:
• A jumper to be put in S2.
N O T E
By default the jumper ENTALP S2 is open. Select the NTC probes.
• The outside probe to be disconnected, B17 (connector J3).
• The return probe not to be disconnected, B15 (connector J13).
In enthalpy mode, favourable conditions are deemed as follows:
• The outside enthalpy is below the return enthalpy by a minimum of 5% (ECOPCENT_OK).
• The outdoor temperature is lower than 20 °C
In order to manually modulate the damper and verify its operation, there is a potentiometer on the
economiser board. The damper will return to its working position after 30 seconds have passed
(MAQTIMAN), which indicates the maximum time that the unit operates in manual mode.
The damper is open by a certain percentage in order to renew the air in the room, provided that the indoor
fan is activated.
• This minimum percentage can be set using the potentiometer or via the communications network.
• In order to set it using the potentiometer:
1. Adjust the potentiometer until reaching the minimum required opening.
2. Next, press the confirm button for 3 seconds in order to store the value.
The default value for the percentage is 10% (ECOPCAPE_DEF).
Operation
Switching of the accessories
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4.5
15