Daikin Hubbard GCU2040PXB1 Installation, Commissioning And Maintenance Manual page 94

Minimum oil
level active
Minimum oil
level not active
Common oil
solenoid ACTIVE
Common oil
solenoid
NOT ACTIVE
Fig. 6.al
Gestione olio comune
da livello minimo
NOT ACTIVE
OPEN
Fig. 6.am
If two levels are present, activation of the solenoid valve occurs when the
maximum level is activated and remains activated in intermittent mode,
with settable opening and closing times, for the entire time in which the
minimum level is not active. If the minimum level signal is activated, the
valve remains deactivated until the maximum level is reactivated again,
as shown in the fi gure:
Minimum oil
level active
Minimum oil
level not active
Maximum oil
level active
Maximum oil
level not active
Common oil
solenoid ACTIVE
Common oil solenoid
NOT ACTIVE
Fig. 6.az
Gestione olio comune
da livello minimo e massimo
ACTIVE
MAX
NOT ACTIVE
OPEN
OPEN
Fig. 6.ba
Copyright HPL March 2021
Minimum off
time oil solenoid
MIN
ACTIVE
CLOSE
NOT ACTIVE
MIN
ACTIVE
OPEN CLOSE
CLOSE CLOSE
If no oil level input is present, activation of the solenoid valve occurs
intermittently for the entire time in which at least one compressor is
active. The opening and closing times of the valve during activation can
be set by a parameter. In any case, if the pressure diff erence between
the oil receiver and suction is less than a settable threshold for at least
a settable time, the solenoid can be forced in intermittent mode with
settable times. It is also possible to set diff erent delay times, to be applied
during normal operation, or when the pressure diff erence exceeds the
threshold, in order to ensure pressurization of the receiver.
Common oil management based on diff erential pressure
pR300T also off ers the possibility to confi gure an oil receiver pressure
probe, directly from the "Inputs/Outputs" menu:
Inputs/Outputs Status
as well as a digital output for the oil reservoir, again at the same path:
Inputs/Outputs Status
This will manage the solenoid valve placed between the oil separator and
receiver. Once these two I/Os have been enabled, a pressure diff erential
threshold can be set between the oil receiver pressure and the suction
line pressure, from the "Other functions" menu:
Other functions Oil Settings
If the diff erence between the two pressure values is less than the
threshold, the pR300T will open the pressurising solenoid valve between
the separator and receiver. This activation may be delayed by a settable
value in seconds. The valve will be closed immediately once the correct
diff erence between the two pressure values has been restored.
6.11.3 Summary of inputs, outputs and oil
parameters
The following are summary tables of the inputs/outputs used and the
parameters with indications of the related confi guration screens. For
details, refer to Appendix A.1.
Summary of inputs/outputs and oil cooling parameters
Mask
Bab41, Eaaa05 Oil temperature probe compressor 1 line 1
Bab42, Eaaa06 Oil temperature probe compressor 2 line 1
Bab43, Eaaa07 Oil temperature probe compressor 3 line 1
Analog inputs
Bab44, Eaaa08 Oil temperature probe compressor 4 line 1
Bab45, Eaaa09 Oil temperature probe compressor 5 line 1
Bab46, Eaaa10 Oil temperature probe compressor 6 line 1
Digital inputs ---
Analog outputs ---
Eaaa16
Eaaa19
Eaaa22
Digital outputs
Eaaa25
Eaaa28
Eaaa31
Eaab15
Eaab08
Parameters
Eaab16
Eaab20
45
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Analog Inputs Screen Bab63
Digital Outputs Screen Bac71
Screen Eaab14
Description
---
---
Oil cooling compressor 1 line 1
Oil cooling compressor 2 line 1
Oil cooling compressor 3 line 1
Oil cooling compressor 4 line 1
Oil cooling compressor 5 line 1
Oil cooling compressor 6 line 1
Enable oil cooling compressors (line 1)
Oil cooling functioning only when compressor
functioning
Oil temperature setpoint (line 1)
Oil temperature diff erential (line 1)
Fan startup time in case of oil probe error (line 1)
Fan shutdown time in case of oil probe error (line 1)
Oil cooler high temperature alarm threshold (line 1)
Oil cooler high temperature alarm diff erential (line 1)
Oil cooler high temperature alarm delay (line 1)
Oil cooler low temperature alarm threshold (line 1)
Oil cooler low temperat. alarm diff erential (line 1)
Oil cooler low temperature alarm delay (line 1)
P4114S Rev 03
pRack PR300T +0300018EN rel. 1.5 - 02.05.2017
ENG
Tab. 6.e