EN/07.2013/58/106
7.30. Custom 30
It manages free cooling units.
ANOUT2 has a value proportional to the free cooling.
ANOUT2 will be activated 60 seconds after free cooling is on.
System configuration
Default probe configuration (selected by I/O setup):
• Internal Temperature TI (T1)
• External Air Temperature TAE (T3)
• Internal Relative Humidity: IRH (IC2)
The comfort unit is not present and there isn’t evaporator. There is free cooling fan.
On the relative alarm masks the evaporator word disappears.
Control
• Freecooling control
The parameters involved are:
– M86 MIN SWITCHING ON FOR EVAP. FAN: pre-set = 10 Sec
– M87 MIN SWITCHING OFF FOR EVAP. FAN: pre-set = 10 Sec
The fan is switched off only if it’s elapsed a time greater than M86 from the last switch on.
The fan is switched on only if it’s elapsed a time greater than M87 from the last switch off.
If TAE < M40: fan and damper off
If (TI - TAE) < M39: fan and damper off
Off usually means: fan speed = M88 and free cooling open = M43.
If the machine is off or fire alarm is occurred: fan speed = 0 and free cooling open = 0.
This custom uses M49=0 (only by damper) and min fan speed M88 = 75.
Free cooling is modulated on damper opening, while the fans will be a fixed speed.
Free cooling damper opening
100%
M43
TI
S01+M31*S06
S01+M32*S06
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