Helios AIR1-CO DX-Serie Montage- Und Betriebsvorschrift Seite 51

Installation and Operating Instructions
NOTE
Change-over-unit AIR1-CO DX
The following inputs can be connected to the on-site cooling system control board:
-Terminal 10-11  Ventilation active
-Terminal 48-49  Cooling activate
-Terminal 50-51  0-10 V heating/cooling
-Terminal 42-43  DX alarm
-Terminal 44-45  Defrosting alarm
2�7�5 Configuration change-over register DX
- Select after heater type "DX".
- Press the "OK" button in the "Cooler type" menu.
After heater type
DX
- Select cooler type "DX.
Cooler type
DX
- Press the "OK" button in the "Cooler type" menu.
Accept all settings
and activate the
application
Yes
The following inputs must be connected to the on-site cooling system control board:
-Terminal 11-10  Ventilation active
-Terminal 48-49  Cooling activate
-Terminal 46-47  Heating activate
-Terminal 50-51  0-10 V heating/cooling
-Terminal 42-43  DX alarm
-Terminal 44-45  Defrosting alarm
2�7�6 Minimum limit value reduction and PI settings
The control module DX can be used to optimise the control of the change-over register DX by lowering the supply air
temperature lower limit, provided a room temp. cascade or extract air temp. cascade control is used.This results in
the quieter, continuous operation of the cooling systems.
The set reduction of the limit value is only activated when DX cooling is active!
The reduction is not active for cold water cooling, heating or when the cooling requirement is deactivated.
The standard setting for this function is a reduction of 5 °C. This value can be adjusted under Configuration → Cooling
→ "Reduction of minimum supply air temp. limit when DX cooling is active". We recommend adjusting the neutral
zone under Temperature → Supply air temperature → Neutrale zone to a value between +2 and + 5°C. Login as
Administrator required.
The control mode can also be tuned by setting the PI value. The P-band and I-time can be set for this purpose.
P-band control stands for proportional control over a defined range (band). A small P-band results in a rapid response
to a certain change, whereas a larger P-band results in a slower response to the same change.
The I-time is defined as the time required to amplify the output signal by the same value of the P-band.
A small I-time results in a rapid increase in the output signal (depending on P-value), whereas a larger I-time results in
a slower increase in the output signal to the same difference.
If the P-band and I-time presets need to be changed, please contact our customer service team for more information.
The P-band and I-time define the behaviour of the entire temperature controller. This means that the heating, heat
recovery and cooling will be set to the same values. A change in the P-band/I-time not only changes the cooling cont-
rol mode, but also the heating control mode.
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