Profroid QUIETCO2OL MC Notice D'instruction page 82

COMMISSIONING
Liquid Receiver
– The refrigerant charge in Transcritical mode must be maintained as close as possible
to the low level alarm.
– A higher level in this mode could lead to excess charge in Subcritical operation.
Oil separator
– OUTDOOR version with coalescent oil separator : the separator filter must be
replaced 24 to 36 hours at the latest after commissioning (filter for replacement
supplied)
– In the case of OUTDOOR SH versions, there is no need to add an excess of oil
during commissioning, beyond the recommendations done in the chapter
"COMMISSIONING/Oil Charge" about the initial oil charge.
– Indeed, in this case, any excess of oil usually leads to oil blows on the rack causing
the degradation of the compressors (breakages of valves plates / or gasket).
Nota :
– If the superheat of the medium temperature consumer is too low, the MP valve will
open, which can lead to an alarm at the consumers
– If the superheat at the outlet of the expansion valve is too low (4 ° K for 10 minutes),
the controller slowly increases the MP receiver pressure up to 40 bar and in this case
an overheating alarm at the control unit may appear
– It may be necessary to deactivate this alarm temporarily for commissioning, but it
must be operational at the end of commissioning
Liquid level alarm
High&low level alarms
– The triggering of the alarm is based on an hourly average between faulty readings
and no faults.
– If the alarm is too frequent outside of a lack of refrigerant, the sampling time may
not be appropriate.
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