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Horizontal package air conditionners

Possible problems at commissioning

All indications given in this brochure must be respected and
complied with to guarantee a correct operation of the units.

Next, several possible operation problems are stated which could
happen if the conditions of the commissioning are not appropriate.

- Air

ﬂ

ow lack: very high differences between inlet and outlet, originated

by a high pressure drop in the ducts, or by other causes that impede
the correct air circulation.

- Air recirculation in the unit, originated by some obstacle in the air

aspiration or outlet.

- Noise problems because of excessive air

ﬂ

ow in the grille.

- Water over

ﬂ

owing to the pan problems, originated by an excessive

ﬂ

ow, an incorrect siphon installation or because a defective unit level.

- Refrigerant circuit humidity problem, because of an incorrect vacuum

realization.

- If the refrigerant load is lower than required, the suction pressure

will be rather lower than normal, and overheating when suctioning
from the compressors will be high. This can cause an interruption
in operation due to activation of the refrigerant load safety device.

To adjust the refrigerant load,

a schrader valve is built into
the unit on the liquid line,
located inside the compressor
enclosure.

- When commissioning the compressors, check

the subcooling and overheating and thus verify
if the refrigerant load is appropriate to the
operating conditions.

R 410A

Control of the refrigerant load

- Check the unit operation and verify the safety devices.

- Verify the absence of any leaks of the refrigerant. In case of a leak:

• Completely empty the unit using a speciﬁ

c recovery unit for R-410A

and repair the leak.

• Next, reload the gas into the unit according to load data provided

in the technical characteristics table and in the unit’s data plate.

• Add the refrigerant via the schrader valve of the liquid line using

the appropriate equipment and tools, with the compressor stopped,
monitoring the pressures to control any anomaly.

High-pressure schrader valve

(optional pressure gauge

connection)

Low-pressure schrader valve

(optional pressure gauge

connection)

Schrader valve for

refrigerant load

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 electrical

components,

- signi

ﬁ

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.

Operational checks

Cooling MODE

Compressor

Suction pressure

bar

Suction temperature (1)

ºC

Condensation pressure

bar

Condensation temperature (2)

ºC

Air
condenser