EVCO c-pro mega RACK - Manual (Page 98)

C-PRO MEGA RACK & C-PRO GIGA RACK APPLICATION MANUAL
Page 98
To restore the compressor to normal use, it is necessary to reset the parameter compressor enable to
the value “A” (Automatic), otherwise, the compressor in question will continue to operate in
manual mode, not fulfilling the switch on and/or off requests calculated by the selected regulation.
Fans
Manual or other operation of the fans is guaranteed by the parameter fan enable:
⋅
If set to the value “A” it defines the normal behaviour of the device
⋅
If set to the value “M” it disables the fan and switches it to manual operation.
A manually functioning fan does not participate in regulations, and may be forced into switching
on/off by setting the property fan forcing (present in the Service -> Fan forcing menu).
As already mentioned, the fan is, in any case, sensitive to alarms and the relevant consequences.
To restore the fan to normal use, it is necessary to once more restore the parameter fan enable to the
value “A” (Automatic), otherwise, the fan in question will continue to operate in manual mode, not
fulfilling the switch on and/or off requests calculated by the selected regulation.
Inverters
In the case where it is desired to manually force an inverter, the procedure is slightly different from
that for normal compressors or fans.
If selected, the inverter is virtually the first compressor for each circuit, thus before being able to
correctly execute the procedure, it is necessary to set the correct compressor to manual, depending
on how the system has been configured.
Once manual enabling has been correctly set, it is possible to force, with a value of between 0.0%
and 100.0%, the inverter for each circuit by means of the parameters:
⋅
circuit 1, circuit 2, circuit 3 compressor inverter forcing
⋅
circuit 1, circuit 2, circuit 3 fan inverter forcing
present in the service menu.
Management and the forcing procedure for fan inverters is the same as that for compressors.
6.7.7 Floating condensation management
This allows modification of the fan operating setpoint on the basis of the external temperature. To
enable this function, it is necessary to set (from the installer -> Miscellaneous menu) the
parameters:
⋅
enable external temperature probe (PH24)
⋅
enable floating condensation (PF71)
⋅
Temperature offset (PF72): condensation temperature offset (associated with the type of
condenser module used)
⋅
set floating condensation Min (PF73): minimum condensation value, guaranteeing correct
lubrication
⋅
set floating condensation Max (PF74): maximum condensation value, in order to avoid
modulations with high external temperatures
The new setpoint will be given by the external temperature added to the parameter delta
temperature. The values of this new set, converted into pressure, are in any case limited by the
range of variation for the condensation setpoint.
Please note. By enabling this function, the condensation setpoint parameters of the individual
circuits no longer have any effect on condensation regulation, indeed the setpoint used will be a
function of delta T and the external temperature.