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must be carried out by competent and authorised personnel;

- Perform brazing or welding only on empty pipes and clear of any

lubricating oil residues; do not near flames or other heat sources to
the pipes containing under pressure fluids;

-   Do not work with naked flames near the unit;
-   Do not bend or hit pipes containing under pressure fluids;
-  The unit is equipped with overpressure release devices (safety valve):

if these devices intervene, the refrigerant gas is released at high
temperature and speed;

- The machine and the pipes have very hot or very cold surfaces that

lead to risk of burns by contact;

- Do not use your hands to control any refrigerant leaks;
- Before removing elements along the under pressure hydronic circu-

its, shut-off the pipe section involved and gradually drain the fluid
until its pressure and that of the atmosphere are balanced.

PREVENTION AGAINST RESIDUAL ELECTRICAL RISKS

- Before opening the electrical panel, disconnect the unit from the

mains by means of the external isolator;

- Wait the time indicated on the machine plate from when the power

supply was disconnected from the unit before accessing inside the
electrical panel;

- If the unit is equipped with integrated inverter type compressors,

disconnect the power supply and wait at least 5 minutes before
accessing for maintenance: the internal components remain live for
this time, generating the risk of electrocution.

- If the power supply cable is damaged, it must be replaced by the

manufacturer, After Sales Service or by another similarly qualified
person, to avoid dangerous situations.

CLEANING THE MACHINE

The machine must be turned off and electrically disconnected when
being cleaned.

INSPECTION AND CONTROL

The machine must be turned off and electrically disconnected during its
inspection and leak check.

ROUTINE AND EXTRAORDINARY MAINTENANCE

The machine must be turned off and electrically disconnected during its
maintenance (with possible replacement of components). In particular:
- Before any intervention, isolate the unit from the mains by means of

the external isolator provided for the insertion of padlocks (up to 3)
for blocking in ‘’open’’ position;

- Place a sign reading ‘’Do not turn on – maintenance in progress’’ on

the open isolator;

- Equip yourself with tools in good condition and make sure to have

fully understood the instructions before using them;

- Equip yourself with the appropriate personal protective equipment

as indicated in paragraph 1 of this report;

- For outdoor units, do not perform interventions in dangerous wea-

ther conditions such as rain, snow, fog, thunderstorms, etc;

- The cooling circuit components must be replaced after draining the

refrigerant gas contained in the circuit;

- During venting protect yourself against any leakage of fluids at dan-

gerous temperatures and/or pressures;

- Always use appropriate equipment (extractor, antistatic bracelet etc)

when replacing electronic boards;

- If replacing a motor, compressor, evaporator, condensing coil or any

other heavy element, make sure that the lifting devices are compati-
ble with the weight to be handled;

- In air units with independent compressor compartment, do not

access the fan compartment without having first disconnected the
machine through the isolator on the board and having placed a sign
reading ‘’Do not turn on – maintenance in progress’’;

- Always and only use original spare parts purchased directly from Aer-

mec or from oﬃcial dealers. Contact Aermec should it be necessary
to move the unit one year after its positioning on-site or it must be
dismantled;

- It is not permitted to change the refrigerant, hydraulic or electric

layout of the unit, or its control logic unless expressly authorised by
Aermec;

- The machine must be loaded with the refrigerant in the feature label

and in the required quantity;

- Make sure to have removed all tools, electrical cables or other loose

object and having perfectly connected the machine to the system
before closing it and starting it;

- The inspections and measurements necessary to establish the correct

functioning of the machine to be run with the machine in operation,
must be performed with the machine closed (framework fixed on
the machine), reading the measurements collected by the control
board and viewable in the control panel of the same. In the case of
machines with cooling circuit compartment open, stand in front of
the control panel of the electrical panel remaining distant and not
exposed to the under pressure parts of the cooling circuit

ATTENTION
When having to take measurements with the machine on and the
electrical panel and cooling circuit open, be careful since the machine is
live, the cooling circuit contains high pressure gas, the pipes may be hot
or cold, some parts may be in motion.

Any absorption measurements of the compressors, compressor casings,
pumps and fans as well as the power supply measurements, must be taken
as follows:
- With machine off, access its panel;
- Connect the measuring instruments such as current clamps (to me-

asure the current) and multimeters (to measure the voltage). These
instruments must be fitted with appropriate terminals/clamps that
allow to remotely control the measurement;

- Access the machine and read the measurements made by the instru-

ments, keeping AWAY from live electrical parts;

- As soon as the measurements are taken, turn off the machine, remo-

ve the instruments and close the electrical panel.

The measurements of the compressor inlet and outlet temperature and
pressure to determine the overheating and subcooling of the machine,
must be carried out as follows:

- With machine off, access its cooling circuit;
- Connect the necessary instruments,

• Pressure gauges connected through appropriate extensions to the
compressor inlet and outlet pressure plugs;

• Thermometers connected to thermocouple probes that are fixed
to the compressor inlet and outlet pipes. Avoid using metratast that
require the operator to near the machine cooling circuit;

- Access the machines

and acquire the measurements, keeping

AWAY from the under pressure parts of the cooling circuit;

- As soon as the measurements are taken, turn off the machine, remo-