EN/07.2013/58/62
4.10. Evaporator fan speed management
The parameters involved are:
• M51 FREECOOLING REGULATION: pre-set= DAMPER
• M86 DELAY TIME FOR START EVAPORATOR FAN: pre-set= 30 sec
• M87 DELAY TIME FOR STOP EVAPORATOR FAN: pre-set= 90 sec
• M88 MIN SWITCHING ON FOR EVAPORATOR FAN: pre-set= 10 sec
• M89 MIN SWITCHING OFF FOR EVAPORATOR FAN: pre-set= 10 sec
• M91 MIN EVAPORATOR FAN SPEED WITH HEATERS ON; pre-set = 70%
• M92 MAX EVAPORATOR FAN SPEED: pre-set= 100%
• M93 MAX EVAPORATOR FAN SPEED IN FREE COOLING: pre-set= 100%
• M94 MIN EVAP. FAN SPEED IN DEAD ZONE: pre-set= 0%
• M125 MAX EVAP. FAN SPEED DURING NIGHT MODE: pre-set= 75%
• M138 UPPER LIMIT OF THE DEAD ZONE: pre-set = 0 °C
• M150 ENABLE DEAD ZONE CONTROL: pre-set = NO
• M151 HYSTERESIS FOR ENTER IN DEAD ZONE: pre-set = 2 °C
• M158 ENABLE DANFOSS COMPRESSOR: pre-set = NO
• M166 EVAPORATOR FANS SET POINT: pre-set = 10 °C
• M167 EVAPORATOR FANS BAND: pre-set = 10 °C
• M168 EVAPORATOR FANS INTEGRAL TIME: pre-set = 0 Sec
If the unit is off or in stand by, the evaporator fan is off.
When the unit is switched on, the evaporator will be switched on after a time equal to the parameter M86.
When the unit is switched off, the evaporator will be switched off after a time equal to the parameter M87.
The evaporator fan is on for minimum time, which is the parameter M88, and, when it is switched off, it will be off for a
minimum time, which is the parameter M89.
Free cooling Disabled:
If TM is present, M166>0, M167>0 the fans status control is a proportional-integral (PI) type. This control uses as
regulation parameter: (M166 - (TI-TM)). The band is set by parameter M167 while the integral time is set by parameter
M168. Min speed is M90 and max speed is M92.
If TM is not present or M166=0, M167=0: speed is M92.
Free cooling enabled and M51 = “damper”
Cooling: Fan speed = M92.
Free cooling and Assisted Free cooling: Fan speed = M93.
No condition (dead zone): Fan speed = M92.
Free cooling enabled and M51 = “damper + fan”
Cooling: Fan speed = as free cooling disabled
Assisted Free cooling: Fan speed = maximum between cooling and free cooling fan speed
No condition (dead zone): Fan speed = M92.
If dehumidification is active, evaporator fan speed is partialized according to par. 4.2.2.
If freecooling is enabled with evaporator fan speed partialization, then refer to par. 4.4.1, fan speed and damper regulation.
If the parameter M51 is set on “damp+fan” option, the management of evaporator fan is as described in par. 4.4.1, fan
speed and damper regulation.
In night mode the evaporator fan speed is also limited to M125 setup parameter.
When M150 is set to YES, the heating and the cooling are off and TI < S01 + M138 - M151 (upper limit of the dead zone),
the unit enters in the dead zone and the evaporator fans speed becomes equal to the parameter M94. The unit exits
from the dead zone when the heating or the cooling is on or IT > S01 + M138. The dead zone control can be disabled
by setting parameter M150 to NO.
To Next Page
Loading...
Need help?
General
