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Installation, operation and maintenance instructions - VMGFE102
1.5 - Maintenance safety considerations
Engineers working on the electric or refrigeration compo-
nents must be authorized, trained and fully qualifi ed to do so
(e.g. electricians trained and qualifi ed in accordance with IEC
60364 Classifi cation BA4).
All refrigerant circuit work must be carried out by a trained
person, fully qualifi ed to work on these units. He must have
been trained and be familiar with the equipment and the
installation. All welding operations must be carried out by
qualifi ed specialists.
The AR05 units use high-pressure R-410A refrigerant (the unit
operating pressure is above 40 bar, the pressure at 35°C air
temperature is 50% higher than for R-22). Special equipment
must be used when working on the refrigerant circuit
(pressure gauge, charge transfer, etc.).
Any manipulation (opening or closing) of a shut-off valve must
be carried out by a qualifi ed and authorised engineer,
observing applicable standards (e.g. during draining
operations). The unit must be switched off while this is done.
During any handling, maintenance and service operations
the engineers working on the unit must be equipped with
safety gloves, glasses, shoes and protective clothing.
Never work on a unit that is still energized. Never work on any
of the electrical components, until the general power supply
to the unit has been cut.
If any maintenance operations are carried out on the unit, lock
the power supply circuit in the open position and secure the
machine upstream with a padlock.
If the work is interrupted, always ensure that all circuits are
still deenergized before resuming the work.
ATTENTION: Even if the unit has been switched off , the power
circuit remains energized, unless the unit or circuit disconnect
switch is open. Refer to the wiring diagram for further details.
Attach appropriate safety labels.
If any work is carried out in the fan area, specifi cally if the
grilles or casings have to be removed, cut the power supply to
the fans to prevent their operation.
It is recommended to install an indicating device to show if
part of the refrigerant has leaked from the valve. The
presence of oil at the outlet orifi ce is a useful indicator that
refrigerant has leaked. Keep this orifi ce clean to ensure that
any leaks are obvious. The calibration of a valve that has
leaked is generally lower than its original calibration. The new
calibration may aff ect the operating range. To avoid nuisance
tripping or leaks, replace or re-calibrate the valve.
OPERATING CHECKS:
•
IMPORTANT INFORMATION REGARDING THE
REFRIGERANT USED:
This product contains fl uorinated greenhouse gas covered by
the Kyoto protocol.
Refrigerant type: R-410A
Global Warming Potential (GWP): 1975
Periodic inspections for refrigerant leaks may be required
depending on European or local legislation. Please contact
your local dealer for more information.
•
During the life-time of the system, inspection and tests must
be carried out in accordance with national regulations.
Safety device checks (annex D – EN 378-4):
•
If there are no local regulations, the safety devices must be
checked on site once a year (high-pressure switches), and
every fi ve years for external overpressure devices (safety
valves).
At least once a year thoroughly inspect the protection devices
(valves). If the machine operates in a corrosive environment,
inspect the protection devices more frequently.
Regularly carry out leak tests and immediately repair any leaks.
Ensure regularly that the vibration levels remain accept-able
and close to those at the initial unit start-up.
Before opening a refrigerant circuit, transfer the refrigerant to
bottles specifi cally provided for this purpose and consult the
pressure gauges.
Change the refrigerant after equipment failures, following a
procedure such as the one described in NFE 29-795 or carry out
a refrigerant analysis in a specialist laboratory.
If the refrigerant circuit remains open for longer than a day after
an intervention (such as a component replacement), the
openings must be plugged and the circuit must be charged
with nitrogen (inertia principle). The objective is to prevent
penetration of atmospheric humidity and the result-ing
corrosion on the internal walls and on non-protected steel
surfaces.
1.6 - Repair safety considerations
All installation parts must be maintained by the personnel in
charge, in order to avoid deterioration and injury. Faults and
leaks must be repaired immediately. The authorized
technician must have the responsibility to repair the fault
immediately. Each time repairs have been carried out to the
unit, the operation of the safety devices must be re-checked.
Comply with the regulations and recommendations in unit
and HVAC installation safety standards, such as: EN 378, ISO
5149, etc.
Do not use oxygen to purge lines or to pressurize a machine for
any purpose. Oxygen gas reacts violently with oil, grease, and
other common substances.
