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11 - COMMISSIONING
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 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.
12 - MAINTENANCE
The minimal maintenance operations and their periodicity will be
made according to the national regulations.
Any intervention on the electric cooling components must be made
by a qualifi ed and authorized technician.
Technicians who intervene with the unit must use the necessary
safety equipment (gloves, goggles, insulating clothing, safety
shoes, etc.).
Furthermore, if working around sources of signifi cant noise, we
recommend the use of noise-dampening headgear.
Caution: Before intervening in the unit, cut off main
power.
Recommendations
■ Do not lean on the unit. A platform must be used to work on
a level.
■ Do not lean on the copper refrigerant tubes.
■ Keep the unit clean.
■ Keep the space surrounding the unit clean and cleared in order
to avoid accidents and ensure the proper ventilation of the coil.
■ Perform a visual (remains of water or oil below or around the
unit) and auditory inspection of the entire installation.
■ In general, a corrosion control must be performed on the
metallic parts of the unit (frame, bodywork, exchangers, electric
panel, etc.).
■ Check that the insulation foam is not unstuck or torn.
20
Cooling MODE
Suction pressure
Suction temperature (1)
Compressor
Condensation pressure
Condensation temperature (2)
Gas inlet temperature
Liquid outlet temperature (3)
Air condenser
Air inlet temperature
Outdoor temperature
Air outlet temperature
Water inlet temperature
Water outlet temperature
Water
evaporator
Liquid inlet temperature
Evaporator outlet temperature (4)
Subcooling (2) - (3)
Overheating (4) - (1)
■ All the electric connection states must be checked as well, as
well as the air tightness of the diff erent circuits.
Next, some recommendations are stated for performing the
maintenance and cleaning of the unit's components.
Plate exchanger
■ The exchangers are fi tted with thermal insulation. Check that
the foam is not unstuck or broken.
■ The water quality and the pressure drop must be verifi ed at
the exchanger level. After verifying the mesh fi lter condition,
if necessary, the exchanger must be cleaned. To this end, a
weak solution of phosphoric acid 5% must be circulated using
the high pressure pump. During optimum cleaning, the cleaning
solution fl ow must, as a minimum, be 1,5 times the working
fl ow, preferably in the inverse circulation mode. This must be
followed by thorough rinsing with water to remove any acidic
residues. It is advisable to circulate a solution 1%-2% of sodium
hydroxide prior to the last rinsing in order to ensure that the acid
has been neutralised.
■ Any repair or modifi cation to the plate exchanger is prohibited.
It can only be replaced by an original part.
Air coil
■ Check that the coil is free from dust and grease.
■ Cleaning the accumulated dust on the coil can be performed
with a vacuum cleaner perpendicular to the fi ns or with a low-
pressure water cleaner. Grease can be removed with water with
degreaser. Do not put stress on the fi ns as they could deform.
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