EVCO c-pro nano CHIL - Manual (Page 101)

C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Pag. 101
6.5 Compressor Regulation
The control of air temperature (air-to-air machines) or of water temperature (air-to-water or water-
to-water machines) is carried out via the control of mechanical components, i.e. compressors and/or
fans. Two types of regulation are provided for: lateral-band regulation on inlet temperature and
neutral-zone regulation on outlet temperature.
6.5.1 Lateral-band (LB) regulation
Lateral-band regulation avails itself of proportional control, in order to establish when to cut in or
out the compressors in use, thus regularising – within the proportional band – the switching ON or
OFF of the various devices.
The following figure illustrates the behaviour of band regulation (Set point, Set point + Proportional
band) in the case of summer operation (chiller). According to the inlet temperature value, regulation
increases or decreases the number of steps to be required of the compressors. In this particular
regulation, the entire band is shifted beyond the set point.
- Mode = Operating mode (0 = Summer)
- SPC1 = LB summer set point
- PC11 = Regulation type (0 = Lateral band)
- PC12 = Regulation band
- PC21 = Chiller set point lower limit
- PC22 = Chiller set point upper limit
Conversely, in winter operating mode (heat pump), the entire band is shifted below the set point:
SP
SP + PB
Steps
Inlet T