ECH 200 BD
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SET(1) = SET(COO) – AO(1) = 12 –1.7 = 10.3
7.2 Fan control in Defrosting mode
During the defrosting phase, the condensing pressure may sometimes reach alarm levels before the heat exchanger has
defrosted all the ice.
To prevent this condition from tripping the high pressure alarm, the unit starts fans at minimum speed if the
pressure/temperature read by probe AI3 is above value F22.
The hysteresis of the regulator is above parameter F11.
The function can be enabled with parameter F21.
FAN : fan AI3: probe AI3
MIN: minimum speed of the fan
7.3 Antifreeze function for units with heat pump
This function enables the water pump to be used in Antifreeze mode.
If the water temperature is low and the unit is not running in Heating mode, the hydraulic pump starts followed by the
compressor.
The function is always active if A23=1.
If the water pump is off and temperature is AI1< A20, the unit starts the water pump.
If the temperature is AI1<A21, the unit starts the heat pump (if it is off).
This operating is carried out in modes: Off, Standby and Heating with active remote Off.
When the unit displays the Heating mode, it is no longer possible to change the operating mode from the keyboard or by
means of a digital input.
The control resumes normal operation if AI1> A22.
MIN
OFF
F11
AI3
FAN
F22
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