Carel Hecu handleiding
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Hecu +0300023EN rel. 1.2 - 14.12.2021
Example 1: minimum modulating output value 0 V, maximum value 10 V,
minimum modulating device capacity 0 %, maximum value 100 %
.
Differential Differential
Set point
Min capacity = 0%
Max capacity = 100%
Regulation
probe value
Analog output
Min output
value = 0 V
Max output
value = 10 V
Fig. 6.i
Example 2: minimum modulating output value 0 V, maximum value 10 V,
minimum modulating device capacity 60 %, maximum value 100 %.
Differential Differential
Set point
Min capacity = 60%
Max capacity = 100%
Regulation
probe value
Analog output
Min output
value = 0 V
Max output
value = 10 V
Fig. 6.j
Example 3: minimum modulating output value 2 V, maximum value 10 V,
minimum modulating device capacity 60 %, maximum value 100 %.
Differential Differential
Set point
Min capacity = 60%
Max capacity = 100%
Regulation
probe value
Analog output
Min output
value = 0 V
Max output
value = 10 V
Fig. 6.k
Cut-o
Hecu manages a cut-off control function for the fans; the function can be
enabled and the related parameters set in main menu branch Db05. The
operating principle of the cut-off function is shown in the fi gure:
Differential Differential
Cut-Off Set point Regulation Set point
Max capacity = 100%
Regulation
probe value
Regulation
request
Cut-Off value
of request
Max
output value
Fig. 6.l
A percentage of the control request and a cut-off set point can be set.
When the control request reaches the set cut-off value, this value is kept
constant until the control value falls below the cut-off set point, after
which it falls to 0 % and remains there until the request exceeds the cut-
off value again.
Fans with compressor OFF
The fans can be stopped after a delay when the compressor is switched
OFF. They can also be activated in advance when the compressor request
is increasing. These settings are made on screen Db04.
Speed up
Hecu can manage the speed up function, used to overcome the
initial inertia of the fans. The function can be enabled and the related
parameters set in main menu branch Dg13.
If speed up is enabled, a start time can be set in which the fan speed is
forced to 100%. If the outside temperature sensor is used, moreover, a
threshold can be set (with reset diff erential) below which speed up is
disabled, so as to not drastically lower the condensing pressure at start-
up.
Floating condensing pressure set point
For the condenser line, the fl oating set point enabled on Dd05) is
based on the outside temperature. The fl oating condensing pressure
set point is achieved by adding a constant programmable value to the
outside temperature and limiting the resulting value between a settable
minimum (Db02) and the set point set on Dd06, as shown in the fi gure:
Max
Min
offset
Floating
setpoint
external temperature
time
Fig. 6.m
6.6 Oil management
Oil injection
Oil return is a critical factor when using BLDC compressors. Hecu
provides three diff erent solutions for injection of the oil returning to the
compressor. The related confi gurations can be set on screen Fab15.
Capillary valve
The simplest solution is to use a capillary valve, with fi xed opening,
calibrated based on rated conditions. This solution however creates
ineffi ciencies, by injecting more or less oil than required by the
compressor.
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Productinformatie
| Merk | Carel |
| Model | Hecu |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 10743 MB |
