ECH 200 BD
33/76
Negative Offset
Pa H34: outdoor temperature set point during cooling
Pa H35: outdoor temperature set point during heating
Ext Temp: outdoor temperature
8.4 Switching from digital input
Digital inputs ID3, ID4, ID5 and AI4 (analogue inputs) may be configured to give an ON-OFF command. If this type of input
is activated, the instrument will turn off all loads and show “E00” on the display.
8.5 Load control
The parameters used to control loads on the basis of the temperature/pressure conditions detected by the probes are
described below.
8.5.1 Compressor control – regulation algorithm
The regulation algorithm calculates the load to be supplied through the compressors for both heating and cooling.
REGULATION ALGORITHM IN COOL MODE
If probe AI2 (analogue inputs) is not configured as a digital input for requests for cooling (Pa H06=2) or probe
AI1(analogue inputs) as a digital input for regulation algorithm requests (Pa H05=3), compressor management will depend
on environment temperature and a SET POINT which may be entered using the keyboard.
• AI1 = temperature of inlet water or inlet air
• SET COOL= cooling set point set from keyboard
• Pa C03 = hysteresis of cooling thermostat
• Pa C05 = delta of power step intervention
Power: power
Step 1: Step 1
Step 2: Step 2
Temp AI1: temperature from probe linked in AI1
Pa C03: hysteresis of cooling thermostat
Pa C05: Power algorithm step intervention differential
Modification
depending on
outdoor
temperature with
negative offset
Regulation
algorithm in cool
mode
Cooling diagram
Delta < 0 Delta > 0
Tem
Pa H34 (cooling) o Pa H35 (heating)
Pa C03 Pa C03
Pa C05
Power
Temp AI1
Step 2
Step 1
SET POINT
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