Carel Hecu handleiding
Handleiding
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Hecu +0300023EN rel. 1.2 - 14.12.2021
The unit fl oating suction pressure set point can vary between a settable
minimum and maximum value. The minimum and maximum limits for
the fl oating set point are shown on screen Cab18 , in line with the limits
set on screen Cab02.
Hecu uses an advanced algorithm to adapt the condensing unit suction
pressure set point based on the request from each evaporator, then
weighing it according to evaporator capacity. Signifi cant variations in
request due to certain evaporator operating states, such as defrost, are
managed by Hecu, maintaining fi ne, stable control.
Min Set point
energy efficiency
Max Set point
time
Suction
pressure
Fig. 6.h
Proportional + integral control will be used to reach the fl oating set
point, based on parameters that can be set on screen Cab14. The
following table shows the recommended parameters for PI control of the
condensing unit.
Pump down
The compressor stop function with pump down can be enabled on
screen Cag04. This function keeps the compressor on until the pump
down pressure threshold is reached, within the maximum time, this too
set on the same screen.
6.4 Backup compressor
Hecu can manage an optional backup compressor in the event of alarms
or malfunctions on the main compressor.
The backup compressor can be enabled on screen Caf03 or during the
wizard procedure.
The backup compressor is a fi xed-speed compressor connected to a
digital output. Once put into operation, control is based on an activation
and deactivation threshold can be set on screen Cab17.
The backup compressor output is activated following one or more alarm
on the BLDC compressor within the so-called evaluation time.
These parameters can be set on screens Hc07 and Hc09.
The backup compressor can also be enabled following a compressor
alarm set as serious on screens Cae04 and Cae10.
Oil injection remains active when the backup compressor is operating.
In the event of calibrated injection based on BLDC compressor speed, a
fi xed value can be set for opening the valve when the backup compressor
is activated, on screen Fab19, depending on the capacity of the backup
compressor used. The default value (50%) is purely indicative.
In other cases, valve control remains unchanged.
Caution: once the backup compressor has been started, no
procedures are available to return to BLDC compressor operation,
therefore the main compressor needs to be repaired or replaced and
then reactivated.
To ensure operation in the event of control board failure, it is recommended
to implement secondary control of the fi xed backup compressor through
activation/deactivation with mechanical pressure switches.
6.5 Fans
Hecu can manage up to two fans with a speed modulation device, which
may be an inverter or a PWM phase control device. In the same was as
for the compressors, fan control can be proportional or proportional plus
integral, based on pressure or temperature.
Fan operation with modulating device
If the fans are controlled by a modulating device, the meaning of the
parameters that associate the minimum and maximum values of the
device’s modulating output and the minimum and maximum capacity of
the modulating device on screens Dag02 and Dbg02 is illustrated in the
following examples.
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Productinformatie
| Merk | Carel |
| Model | Hecu |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 10743 MB |
