EVCO S.p.A.
c-pro 3 nano CHIL | Application manual ver. 1.0 | Code 144CP3NCHE104
page 52 of 90
The switch-on/switch-off requests for the various power steps provided by the compressors in the winter operating mode (heat pump)
follow this logic:
Switch-on: when the output temperature of the AF is below the zero energy band.
Switch-off: when the output temperature of the AF exceeds the zero energy band.
Mode = Operating mode (1 = winter)
SPH1 = Winter setpoint NZ
PC11 = Type of control (1 = zero energy band)
PC 14 = Zero energy band
PC17 = Extra time for outside zone request
PC23 = Lower limit heat pump setpoint
PC24 = Upper limit heat pump setpoint
8.6.3 Self-adapting Control
If the AF output temperature stays outside the zero energy band even after the extra time interval set in parameter PC17 has elapsed,
switch-on or switch-off of another power step will be requested.
The setting of parameter PC18 = 1 activates a self adapting control function of the output temperature in which the zero energy band is
calculated in a way so as to take into account the dynamic properties of the system and the load variations. Specifically, the zero
energy band can vary taking into consideration the compressor timing and number of start-ups per hour. In this case, the value of
parameter PC14 (zero energy band) only makes sense upon unit start-up, while it will be recalculated – within the minimum limit PC15
and the maximum limit PC16 – to “adapt” to an intermediate operating circumstance, if compared to the maximum number of hourly
start-ups (parameter PC09).
PC09 = maximum number of hourly start-ups
PC14 = Zero energy band
PC15 = minimum limit
PC16 = maximum limit
PC17 = extra time for outside zone request
PC18 = enables self adapting control
Note: In the event of a dual circuit system (PG01=2), the control is done on the average value of the two output water temperature
probes.
If a probe doesn’t work, the control is performed by the probe that is intact.
If both probes don’t work, it is not possible to perform the control. Parameter PC10 defines the number of compressors that will be
activated in each circuit.
8.7 Compressor Management
The programme is capable of managing up to a maximum of three compressors of equal power per circuit, so six compressors in total.
Each compressor has a digital input for the protection devices and a digital output for switch-on/switch-off.
The compressors are regulated by the lateral band or zero energy band control (see last chapter) for that which concerns their timing.
8.7.1 Compressor State
The state of each compressor is shown in the HMI operator. A compressor can have the following states:
Disabled: The compressor has not been configured, the display shows “-”.
On: The state display shows“ON”.
SP
switch-off
start-up
AF output temp.
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