EN/07.2013/58/43
4.2. Dehumidification
The parameters involved are:
• S05 HUMIDITY SET POINT (DS): pre-set = 40%
• S06 COOLING BAND: (B): pre-set = 5°C
• S08 BAND HU (BHU): pre-set = 50%
• M69 DEHUMIDIFICATION ENABLE: YES/NO (Default = YES)
• M70 DEHUMIDIFICATION START: pre-set = 20%
• M71 DEHUMIDIFICATION STOP: pre-set = 2%
• M74 TEMP. SET POINT DEHUMID. COMPRESS: pre-set = 20°C **
** Note: M74 should be set the to a value less than S01 for the correct working of this function.
The dehumidification is enabled if M69 = YES.
If the internal humidity probe is connected (see I/O Setup par. 3.4.6), the compressor logic will be as it’s shown in the
next paragraph. Evaporator fan will module its speed according to IRH and to the TE. If the heater is enabled, it’ll be
switched on and off according to internal temperature.
If internal humidity probe isn’t connected, the compressor logic is under the control of humidity switch. The compressor
will be on (dehumidification ON) if the humidity switch is ON, otherwise the compressor is off (dehumidification OFF).
Evaporator fan will be controlled as 100% of dehumidification, if required.
4.2.1. Compressor logic
Dehumidification ON (i.e. compressor ON): Dehumidification OFF (i.e. compressor OFF):
RH-ON = DS + 20% BHU
RH-ON = S05 + M70 * S08
RH-OFF = DS + 2% BHU
RH-OFF = S05 + M70 * S08
The compressor logic depends also from temperature:
Compressor ON: Compressor OFF:
T-ON = TCP + 50% B
T-ON = M74 + M55 * S06
T-OFF = TCP + 0% B
T-OFF = M76 + M56 * S06
4.2.2. Evaporator fan logic
Fan speed is modulated according to IRH (to have dehumidification action) and according to TE to avoid internal coil
freezing. Fan will be driven to the maximum value between the two control logic.
Fan control for dehumidification
Special parameters involved:
• M72 % of Dehumidification Band for Min fan speed: pre-set = 20%
• M73 % of Dehumidification Band for Max fan speed: pre-set = 2%
• M90 MIN EVAPORATOR FAN SPEED: pre-set = 30%
• M91 MIN EVAPORATOR FAN SPEED with Heater on; pre-set = 70%
• M92 MAX EVAPORATOR FAN SPEED: pre-set = 100%
Standard parameters involved:
• S05 HUMIDITY SET POINT (DS): pre-set = 40%
• S08 BAND HU (BHU): pre-set = 50%
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