EVCO S.p.A.
c-pro 3 OEM HRV | Application handbook ver. 4.0 | Code 144CP3OHE404
page 115 of 138
COOLING
HEATING
8.12.4
Compressor switch-on sequence
In a configuration with 2 On-Off compressors, the compressors are switched on in steps. It is possible to choose the rotation of the compressors by acting on parame-
ter PE13 choosing between a rotation with a fixed sequence and a rotation that considers the number of hours and starting points of the single compressor.
Regarding the "hours + starting" rotation, regardless of the number of active compressors, the "next" compressor to be activated will be the one that, based on the
number of operating hours and the number of starts, has the least mechanical wear among those off. In the same way, the "next" compressor to be switched off will be
that with the most mechanical wear among those switched on.
The compressors will be switched both on and off in ascending order based on wear. The wear (w) of the compressors is defined by a formula which compares the
number of operating hours (h) and the number of peaks (s) using two coefficients (n,k) defined by the two parameters:
w = n
x
h + k
x
s
On selecting this type of sequence and putting on of the two parameters, which express the coefficients, to 0, only the number of operating hours or only the number
of peaks can be taken into consideration. It is not possible to set both parameters to 0. The inactive compressor with the lowest wear indicator will be activated first.
The active compressor with the highest wear indicator will be switched off first.
PE13:
Type of compressor rotation
PE14:
Wear based on hours
PE15:
Wear based on peaks
8.12.5
Compressor defrosting
Defrosting will be performed after an operating period with a duration defined by parameter
PE06
. The calculation of this interval of time can be configured on 3 types
of events:
PE11=1
Unit on. In this case, the counting period will start when the machine is switched on. When the machine is switched off, the counting will be suspended
PE11=2
Compressor on. In this case, the counting will start when a compressor is switched on. If all the compressors are switched off, the counting will be sus-
pended.
PE11=3
Compressor defrosting temperature < Setpoint (PE12). For this counting option, the compressor defrosting probe must be configured (after being correctly
positioned). The count will start when the temperature detected by the probe is lower that the setpoint
PE12
. If the temperature exceeds the setpoint, the count will be
suspended.
There are two types of defrosting which can be configured using parameter
PE07
:
PE07=0
Cycle inversion: the compressor stays on during the active defrost phase and the inversion valve is switched to the cooling position. After this phase, the
compressor will be switched and the dripping stage begins.
PE07=1
Compressor stoppage: the compressor will be switched off during the active defrosting stage. After this phase, the dripping phase will start.
PE16
PE17
Analog output (V)
Coil request %
100%
0%
PE18
PE19
Analog output (V)
Coil request %
100%
0%
