EVCO EPU2LXP1CH Installer manual - Manual (Page 56)

EVCO S.p.A. c-pro 3 micro CHIL | Application manual ver. 1.0 | Codice 144CP3CHE104
page 56 of 120
8.6 Compressor Control
The control 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 control are provided: lateral-band control on entering chilled water temperature and zero
energy band control on leaving chilled water temperature.
8.6.1 Lateral-band (LB) control
Lateral-band control is a proportional control function. The chilled water temperature is controlled by switching on or off compressors.
The following figure illustrates the behavior of lateral band control (Set point, Set point + Proportional band) in the case of summer
operation (chiller). Depending on the chilled water entering temperature, the numbers of compressors (steps) are increased or
decreased. In this control mode, the entire band is shifted above the set point.
Mode = Operating mode (0 = Summer)
SPC1 = LB summer set point
PC11 = Control type (0 = Lateral band)
PC12 = Proportional 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:
Mode = Operating mode (1 = Winter)
SPH1 = LB winter set point
PC11 = Control type (0 = Lateral band)
PC12 = Proportional band
Steps
CHW ent T
SP SP - PB
SP
SP + PB
Steps
CHW entering Temp