Description Of The Components - Johnson Controls York YKN2Open board Technical Information

1 Components
1.1

Description of the components

1.1 Description of the components
The list of sensors and actuators of the unit is divided into several categories. The following components
make up part of the unit assembly.
Compressors
Indoor fan
Actuators
Outdoor fans
4-way valve
(pump)
Suction
Outdoors
Liquid
Discharge
Temperature
probes Supply
Return
Water
Outdoors
Enthalpy
probes
Return
Fan thermal switch
Protections High-pressure switch
Low-pressure switch
Compressor 2 and pres‐
ence sensor
Compressor 3
Electric resistors (*)
Gas burners (*)
Hot water coil (*)
Accessories
Economiser, return fan and
air quality probe
Motorised damper
Smoke and high tempera‐
ture detector
Dirty filter detector
(*) Together they are incompatible. It is only possible to have one type of support heat generator.
2
• In cold only units they are responsible for generating cold.
• In pump units they are responsible for generating cold and heat.
• According to the setup of the SW4 it is possible to choose from between 1
compressor ‑ 1 circuit or 2 compressors (tandem) ‑ 1 circuit.
It is used to circulate the air through the indoor coil and conduct it to the supply.
• They are used to circulate the air through the outdoor coil.
• According to the setup of the SW the operation of the outdoor fan varies in
cool mode in accordance with the outside temperature.
It is used to switch the operating cycle of the unit (cool ‑ heat).
The temperature probe is placed on the suction of the compressor.
The temperature probe is placed outdoors.
The temperature probe is placed on the outdoor coil liquid tube.
The temperature probe is placed on the compressor discharge.
The temperature probe is placed on the air supply.
The temperature probe is placed on the air return with the economiser acces‐
sory.
The temperature probe is placed on the water inlet of the hot water coil acces‐
sory.
Enthalpy probes are placed on the outside of the economiser accessory (only
on Roof top).
Enthalpy probes are placed on the return of the economiser accessory (only on
Roof top).
It indicates that the indoor fan protection has come into operation.
It indicates that the unit high pressure is outside the limits or the protection of
the outdoor fan or the compressor module has been activated.
It indicates that the unit low pressure is outside the limits.
It adds a presence input and an extra compressor stage to the unit.
It adds an extra compressor stage to the unit.
They are used to support the heat generation (up to 4 stages).
Heat generation using gas (up to 4 stages).
It is used to support the heat generation (up to 4 stages).
• It allows for cold to be generated by modulating the outdoor air inlet damper
and the renewal of indoor air. The fan increases the capacity of air exhaust
from the room.
• It enables air renewal in accordance with the values of the air quality probe.
It enables air renewal to be fixed.
It detects the presence of smoke in the room or high supply temperature.
It detects whether the filters must be changed.