Carel Hecu handleiding
Handleiding
Je bekijkt pagina 44 van 60
44
Hecu +0300023EN rel. 1.2 - 14.12.2021
After having selected a description pertaining to one group, no
descriptions from other groups can be selected for that alarm.
For example, the selection may be generic, or alternatively thermal
overload + oil.
Each alarm will have its own unique alarm screen, and this will include all
the descriptions associated with that alarm.
According to the number of alarms selected, the descriptions shown in
the table will be associated by default.
Default descriptions based on the number of alarms
Number of alarms Description
1 Generic
2 Overload
HP-LP
3 Overload
HP-LP
Oil
4 Overload
HP
LP
Oil
Tab. 8.b
Notice: in the event of an oil alarm, a special management function
is available to interpret this as an oil level alarm. When the alarm is
activated, an attempt is made to restore the level for a set time before
signalling the alarm and stopping the compressor.
For compressors with modulating devices, further alarms are available:
• compressor inverter warning, common for the entire suction line,
when the device is an inverter
• oil crankcase temperature alarm, high discharge temperature.
Low superheat alarm
The low superheat alarm can also be enabled for the parallel compressor,
in addition to the SSH-DSH alarm, already available.
This is enabled and the related settings are made on the following screen:
The alarm threshold is the same used for the SSH_DSH alarm.
8.3 Pressure alarms
Hecu can manage pressure alarms from a pressure switch or probe,
according to the following diagram.
Alarms from pressure switch:
• Low suction pressure
• High condensing pressure
Alarms from probe:
• Low suction pressure
• High suction pressure
• Low condensing pressure
• High condensing pressure
One possible example for the low pressure alarms is shown in the fi gure:
Pressure
Probe alarmPressostat alarm
LP
Dierential
Fig. 8.c
Alarms from pressure switch
The parameters corresponding to these alarms can be set in branch
G.c.a/G.c.b of the main menu.
Low suction pressure from pressure switch
The low suction pressure alarm from pressure switch has the eff ect of
stopping all the compressors without observing the various times,
therefore when the digital input confi gured as low pressure switch
is activated, all the compressors on the line aff ected are stopped
immediately. This alarm features semiautomatic reset, and both the
monitoring time and the number of activations in the specifi ed period
can be set. If the number of activations is higher, reset becomes manual.
In addition, the delay after which the alarm is activated on both start-up
and during operation can be set.
The delay at start-up only applies to unit start-up and not compressor
power-on.
High condensing pressure from pressure switch
The high condensing pressure alarm from pressure switch has the eff ect
of stopping all the compressors without observing the various times and
forcing the fans on at maximum speed, therefore when the digital input
confi gured as high pressure switch is activated, all the compressors on the
line aff ected are stopped immediately and the fans operate at maximum
output. This alarm features manual or automatic reset, as confi gured by
the user. The delay after which the alarm is activated can also be set.
Pressure alarms from probe
The parameters corresponding to these alarms can be set in branch C.a.e
of the main menu for suction pressure, and D.a.e for condensing pressure.
For these types of alarms, reset is automatic and the activation threshold
and diff erential can be set, as well as the type of threshold, which may be
absolute or relative to the control set point. The fi gure shows an example
of setting the threshold to relative.
Pressure
AlarmSetpoint
Relative threshold
HP
Dierential
Fig. 8.d
Notice: for temperature control, the alarms from probe are
managed based on temperature even when pressure probes are
fi tted.
The eff ects of the diff erent pressure alarms from probe are described
below.
Low suction pressure from probe
The low suction pressure alarm from probe has the eff ect of stopping all
the compressors without observing the times.
High suction pressure from probe
The high suction pressure alarm from probe has the eff ect of forcing
all the compressors on, ignoring the control times, but observing the
compressor protection times.
Low condensing pressure from probe
The low condensing pressure alarm from probe has the eff ect of stopping
all the fans without observing the times.
High condensing pressure from probe
The high condensing pressure alarm from probe has the eff ect of forcing
all the fans on and stopping all the compressors, ignoring the times.
Bekijk gratis de handleiding van Carel Hecu, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.
Productinformatie
| Merk | Carel |
| Model | Hecu |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 10743 MB |
