Carel Hecu handleiding
Handleiding
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Hecu +0300023EN rel. 1.2 - 14.12.2021
The digital input is selected on the following screen:
6.7 High discharge temperature
management
The envelope of a BLDC compressor is also limited by high discharge
temperature. Near the limit value, compressor speed will start slowing,
until stopping on reaching the limit. If the temperature continues to
rise, a safety algorithm will be activated to gradually reduce it. The
corresponding parameters are under submenu Compressors e Safety Æ
screens Fdb04, Hb02 and Hb03.
Speed reduction
Accelleration reduction
Liquid injection
120°C
Alarm
Limit
Action
distance
118°C
116°C
115°C
110°C
Fig. 6.t
If the discharge temperature exceeds the maximum limit, the high
temperature alarm is activated and the compressor is stopped. The alarm
is reset manually.
6.8 Liquid injection
The liquid injection function is available on medium-temperature units
and is used to protect the compressor; the aim is to lower discharge
temperature.
The corresponding parameters are under submenu Other functions Æ
Injection Æ settings Æ screens Fdb01 to Fdb05.
Liquid injection can be performed using a solenoid valve plus capillary or
electronic expansion valve.
Capillary and solenoid valve
V
capillaryLiquid injection solenoid
BLDC
compressor
The solenoid valve opens when exceeding a set threshold, and closes
after falling below a set diff erential, screen Fdb03.
Electronic expansion valve
Liquid
injection
valve
BLDC
compressor
V
This function associates the minimum and maximum discharge
temperature values to the minimum and maximum valve opening
values, as illustrated below, on screen Fdb04.
Opening valve (%)
Discharge
temperature (°C)
Max open. valve
Min open. valve
Min. temp. Max. temp.
Fig. 6.u
Caution: liquid injection is only available for medium temperature
systems. Low temperature systems feature vapour injection.
Caution: it is suggested to install in series with the EEV valve a
solenoid valve to block the fl ow of refrigerant to the compressor in case
of power failure.
6.9 Vapour injection
Vapour injection is an essential function on low-temperature units
featuring compressors equipped with a dedicated vapour port (example:
SIAM) and ready for installation of an economizer.
The economizer can be activated using a subcooling circuit, similar to the
one illustrated in the fi gure below.
EEV valve
Vapor
injection
valve
Vapor Injection
Plate
Exchanger
Evaporator
Condenser
M+i
M
BLDC
compressor
V
Fig. 6.v
This function is used to increase system cooling capacity and effi ciency.
Vapour injection into the compressor is managed using an electronic
expansion valve. Valve opening is controlled in two modes, according
to a discharge temperature threshold. Below this temperature threshold,
control is performed by measuring superheat, while above the threshold
valve opening varies directly according to discharge temperature.
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Productinformatie
| Merk | Carel |
| Model | Hecu |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 10743 MB |
