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14 - COMMISSIONING
● Verify the absence of any leaks of the refrigerant.
In case of a leak:
- Completely drain the refrigerant charge using a specifi c
recovery machine for R-410A refrigerant. Repair the leak.
Important: Always follow the recommendations given
in section 2.2 “Safety standards for refrigerant”.
- Next, reload the refrigerant into the unit according to charge
data provided in a table of the chapter on “Maintenance”
and in the unit’s nameplate.
- Add the refrigerant via the charging valve, located in the
liquid line, using the appropriate equipment and tools, with
the compressors stopped, monitoring the pressures to
control any anomaly.
Charging valve
Filter drier
14.2 Possible problems during commissioning
All indications given in this manual must be respected
and complied with to guarantee the correct operation of
the units.
Next, several possible operation problems are stated which
could happen if the conditions of the commissioning are not
appropriate.
● Airfl ow lack: very high diff erences between inlet and outlet
temperatures, originated by a high pressure drop in the ducts,
or by other causes that impede the correct circulation.
● Air recirculation within the unit, which may be caused by an
obstacle in the air aspiration or outlet.
● Noise problems because of excessive airfl ow in the grille.
● Water overfl owing to the pan problems, originated from an
excessive fl ow, an incorrect siphon installation, or a defective
unit level.
● Refrigerant circuit humidity problem, caused by an incorrect
vacuum realization.
Cooling MODE
Compressor
Suction pressure bar
Suction temperature (1) ºC
Condensation pressure bar
Condensation temperature (2) ºC
Air
condenser
Gas inlet temperature ºC
Liquid outlet temperature (3) ºC
Air inlet temperature ºC
Outdoor temperature ºC
Air outlet temperature ºC
Air
evaporator
Air inlet temperature ºC
Air outlet temperature ºC
Liquid inlet temperature ºC
Evaporation outlet temp. (4) ºC
Subcooling (2) - (3) ºC
Overheating (4) - (1) ºC
Heating MODE
Compressor
Suction pressure bar
Suction temperature (1) ºC
Condensation pressure bar
Condensation temperature (2) ºC
Air
evaporator
Liquid inlet temperature ºC
Gas outlet temperature (4) ºC
Air inlet temperature ºC
Outdoor temperature ºC
Air outlet temperature ºC
Air
condenser
Air inlet temperature ºC
Air outlet temperature ºC
Gas inlet temperature ºC
Liquid outlet temperature (3) ºC
Subcooling (2) - (3) ºC
Overheating (4) - (1) ºC
14.3 Operational checks
Check the unit operation by verifying the electronic control and
the safety devices.
It is also recommendable to create a report, taking note of the
date, which includes the following information:
● the nominal voltage,
● current absorbed by the compressors, fans, and other
Operating readings
electrical components,
● signifi cant temperatures in the cooling circuit (see attached
table),
● other aspects considered interesting such as alarms detected
by the electronic control of the unit.
The recording of these parameters whilst the unit is running
allows controlling the installation performance and it is the
best possible way to avoid breakdowns since the analysis of
these data makes early detection of anomalies possible or the
provision of the necessary means available to ensure that they
do not take place.
If the refrigerant charge is lower than required, the suction
pressure will drop and overheating on the compressor inlets
will be high. This can cause an interruption in operation due
to the activation of the refrigerant charge safety device.
To adjust the refrigerant
charge, each circuit has
a Schrader-type valve in
the liquid line before the
fi lter drier.
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