Maintenance Procedures; Refrigerant Circuit - SystemAir SYSAQUAC 25 Manuel D'installation

17.3. MAINTENANCE PROCEDURES

17.3.1. REFRIGERANT CIRCUIT

This equipment must be submitted to sealing checks minimum once per year, by a professional authorized
to perform such an operation. Refer to national requirements for the frequency of these checks.
Caution
Never use the compressor as a vacuum pump to drain the installation.
17.3.1.1. REFRIGERATING FLUID CHARGE
Run the unit in refrigerating mode to determine whether the group's charge is correct by checking actual sub-
refrigeration.
17.3.1.2. COMPRESSOR OIL
Oil for refrigeration equipment is light and transparent. It maintains its colour for a long operating period.
As a refrigeration system designed and installed properly will run without problem, the compressor oil does not
require replacement, even after a long operating period.
Blackened oil has been exposed to impurities in the refrigeration piping system, or excess temperatures on the
compressor backflow side, which inevitably degrades oil quality. Blackening oil or degradation of its qualities may
also be caused by humidity in the system. Change the oil when its colour changes or when it is degraded.
In this case, before restarting the unit, the refrigeration circuit must be emptied.
Caution
Compressors use polyester oil. During maintenance interventions on the compressor, or if the refrigeration
circuit has to be opened in any point, do not forget that this type of oil is highly hygroscopic, and avoid
exposing it to the atmosphere during long periods, which would require to change the oil.
Warning
Protect the SYSAQUAC frame so as to get back oil that could flow out accidentally.
17.3.1.3. FILTER DRIER
Refrigeration circuits are fitted with filters drier.
The fluid indicator is used to check the refrigeration flow and humidity rate of the refrigerating fluid. The presence
of bubbles indicates that the filter drier is clogged or the charge insufficient.
In this event, even after cleaning the cartridge, the air bubbles remain, which means that the system has lost part
of its refrigerating fluid in one or several points, which must be detected and repaired.
The glass window contains a colour indicator. Comparing the indicator colour with the scale present on the glass
window allows to calculate the humidity rate of the refrigerating fluid. If excessive, change the filter cartridge, run
the system for one day, then check the humidity rate again.
A humidity rate within the preset limits requires no further intervention. If the humidity rate remains too high, change
the filter drier again, start the unit, and run it for another day.
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