Carel Hecu handleiding
Handleiding
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Hecu +0300023EN rel. 1.2 - 14.12.2021
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Evaporation pressure
Condensing pressure
1a
1b
Fig. 6.c
The following zones are defi ned:
1. Inside the envelope (a, b with diff erent maximum discharge
temperatures)
2. High compression ratio
3. High condensing pressure
4. High current
5. High evaporation pressure
6. Low compression ratio
7. Low pressure diff erential
8. Low condensing pressure
9. Low evaporation pressure
Start-up
Hecu manages compressor start-up in the best way possible, adapting
operating speed so as to guarantee that the desired conditions and
excellent lubrication are reached very quickly.
For this reason, when starting the compressor is operated at a settable
fi xed speed (Cag52) for the minimum ON time, Fig. 6.c. During this stage,
the out-of-envelope alarm is disabled, but speed control remains active
if approaching or exceeding zone 2 (maximum compression ratio), 3
(maximum condensing pressure) or 4 (current limit).
The corresponding parameters are in loop Compressors Æ Advanced
Æ screen Cag52:
time
rps
Req
Start-up
speed
Req = min rps
min rps
min ON
time
Fig. 6.d
If 15 seconds after compressor start-up, the pressure diff erential is less
than 0.2 barg higher than the value measured at start-up, Hecu stops the
compressor and generates a “No compressor start-up” alarm. This alarm
is automatically reset and Hecu tries to start the compressor fi ve times
after a 30 second delay. After the fi fth attempt, the alarm is no longer
automatically reset.
The corresponding parameters are in loop Compressors Æ Advanced Æ
screens Cag50, Cag51:
Pressure di erential during start-up
The BLDC compressor cannot start if the pressure diff erential is greater
than a threshold defi ned by the compressor manufacturer. This limit
depends on the maximum current delivered by the inverter. As soon
as the pressure diff erential falls below the minimum threshold, the
compressor can start.
The corresponding parameters are in loop Compressors Æ Advanced
Æ screen Cag49:
When the pressure diff erential is below 9 barg – 0.5 barg (fi xed value), the
compressor is ready to start.
Equalisation
Hecu can exploit the oil injection valve to equalise pressure at start-
up, meaning the condensing unit starts operating more quickly. If oil
injection is managed by a solenoid valve, this function can be enabled
on screen Caf20, while if injection is managed by electronic expansion
valve, the exact valve opening can be set. These settings are all available
on screen Caf20 as shown below.
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 |
