EN-9
EN
5. NTC passive analogue inputs
6. 0-10 V analogue outputs
7. 24 V AC/V DC digital inputs
8. 230 V AC or 24 V AC/V DC digital inputs;
9. Not used
10. connector for all HMI terminals and for downloading the application program
11. relay digital outputs
12. I/O expansion card connector
13. pLAN/graphical terminal/room terminal network connector
14. housing cover for RS485 serial card, Modbus, LON, KNX
15. cover for inserting the fieldbus card
16. Built-in terminal (LCD, buttons and LED) (not available)
1.5 Description of the air handling units
Each air handling unit performs the following functions:
- Air filtration
- Ventilation
- Heating or cooling of air supplied to the room by means of a mixed water coil (hot or cold)
- Control, monitoring, reporting and regulation of its components.
1.6 Temperature regulation functional analysis
By increasing the regulated temperature, the controller will calculate the exact cooling requirement.
If possible it will authorise Free Cooling and then gradually adjust the rotation speed of the heat exchanger wheel (for
Classic model only, and if conditions permit), followed by the "Cold" or "Mixed" No.1 water coil valve in cooling mode
(authorised by the Changeover thermostat), and then the "Cold" No.2 water coil valve; and it may adjust the fan
speeds.
When the temperature drops, the controller will calculate the heat requirement needed to keep this temperature
constant.
It will gradually adjust the rotation speed of the heat exchanger wheel (for Classic model only, and if conditions
permit), followed by the "Hot" or "Mixed" No.1 water coil valve in heating mode (authorised by the Changeover
thermostat), then the "Hot" No.2 water coil valve, and then the electric heater stage(s); and it may adjust the fan
speeds.
When managing at constant pressure, if opening the duct dampers is insufficient, operation of the electric heaters is
prohibited in order to prevent the heating elements from overheating. The authorised flow rate for the electric heaters
is half the nominal flow rate.
1.7 Management of fire faults
The optional fire fault contact triggers a close contact relay.
- One contact wired to an input on the controller so that the latter can signal the occurrence of a fire fault.
- A second contact wired to the fan 0-10V controls to shut them off immediately.
The other faults are described in the alarms table.
1.8 Managing night cooling
Several conditions must be met to activate night cooling:
1- Time range OR override via CMS.
2- Cooling requirement: The return air temperature must be above the cool night temperature setpoint (screen
w7).
3- The free-cooling difference (screen p17) must be sufficient: Treturn air – Tfresh air = 3°C (factory value).
4- The outdoor temperature must be above the "temperature low limit" (screen p17).
The night cooling setpoint is always based on the return air (regardless of the control mode).
For supply air temperature control, this is deactivated during night cooling periods.
Periodic restarts: If one of the night cooling activation conditions is not verified (outdoor temperature, free-cooling
difference, or cool night setpoint), the air handling unit switches to standby mode.
The fans will be restarted at the night cooling flow rate for 5 minutes each hour, and night cooling will be reactivated if
all the conditions are met.
1.9 Free cooling management
Several conditions must be met to activate free cooling:
1- Cooling requirement: The controlled temperature (return air or ambient) must be greater than the setpoint
temperature
2- The free-cooling difference (screen p17) must be sufficient: Treturn air – Tfresh air = 3°C (factory value).
3- The outdoor temperature must be above the "temperature low limit" (screen p17).
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