EN/07.2013/58/41
In night mode the Danfoss compressor speed is limited by parameter M169.
When the Danfoss compressor is enabled, the temperature control is integral-proportional (PI) type, by parameter M165
is possible to set the integral time for the control. Otherwise the temperature control is proportional (P) type.
Temperature control uses as regulation parameter the difference between the value of desired temperature (SET POINT)
and the value of measured temperature (real temperature).
When the Danfoss compressor is enabled, by parameter M179 is possible to select if the temperature control is done
by internal or supply temperature.
When the Danfoss compressor is enabled and the sequencing mode is not enabled, the cooling band of the compressor
is set by parameter S28.
The drive of the Danfoss compressor is switched on by digital output R1 when the C2020 controller is switched on.
The Danfoss compressor status is set by sending a new value to data point ModBus 40212.
Value 1 is sent to the data point ModBus 40201 when the machine is ON or in EMERGENCY, it’s made at least
onerefresh cycleof alldata pointsand the following alarms are notactive: fire – smoke, peripherals error, condenser
pressure invalid, ambient temperature invalid, eev in failure, discharge temperature invalid and suction pressure invalid.
Value 0 is sent in all other cases.
Value 2 is always sent to the data point ModBus 40202.
General temperature control parameters:
• S01 COOLING SET POINT (cool set point - CS): pre-set = 25°C
• S03 HEAT SET POINT (HS): pre-set = 15°C
• S06 COOLING BAND: (B): pre-set = 5°C
Compressor management includes the following parameters for time delays:
• M60 MIN SWITCH ON TIME COMPRESSOR: pre-set = 10 seconds
• M61 MIN SWITCH OFF TIME COMPRESSOR: pre-set = 180 seconds
• M62 DELAY BETWEEN TWO COMPRESSOR STARTS: pre-set = 0 seconds
Compressor and heating elements are normally actuated automatically, as described in the following section, or may be
manually actuated, as described in the manual control chapter.
Warning: control logic changes according to freecooling status. If freecooling option is on, refer to section: Cooling with
freecooling.
Compressor switch on and off time delay, according to the above parameters, must be guarantee except in alarm
condition.
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