EN-9
EREBA He
Repair:
Any repair or modification of a pressure
vessel is prohibited.
Only the replacement of the vessel by
an original part from the manufacturer is
allowed. In this case, the replacement must
be carried out by a qualified technician. The
replacement of the vessel must be entered
in the monitoring and maintenance register.
Recycling:
The pressure equipment can be recycled in
whole or in part. After use they may contain
refrigerant vapours and oil residue. Some
parts are painted.
1.2.3 - Maintenance safety
considerations
Professional technicians working on the
electric or refrigeration components must be
authorized, trained and fully qualified to do
so.
All refrigerant circuit work must be carried out
by a trained person, fully qualified 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 qualified specialists.
The 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.).
Do not clean the unit with hot water or
steam. This may cause a pressure increase
of the refrigerant.
Any manipulation (opening or closing)
of a shut-off valve must be carried out
by a qualified and authorised technician,
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 qualified technician
working on the unit must be equipped with
safety gloves, safety 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 de-energized before
resuming the work.
Even if the unit has been switched off,
the power circuit remains energized,
unless the unit or customer circuit
disconnect switch is open. Refer
to the wiring diagram for further
details. Attach appropriate safety
labels. When working in a fan area,
specifically if the grilles have to be
removed, isolate the power supply to
the fans to prevent their operation.
The variable frequency drives
(VFD) fitted to the units have circuit
capacitors whose discharge time is
five (5) minutes after disconnecting
the power supply.
Therefore, after disconnecting the
power supply of the control box, wait
for 5 minutes before access it.
Before any intervention, verify that
there is no voltage present at any
accessible conducting parts of the
power circuit.
Moreover be careful of contact with
zones at hot temperature inside
the unit, which can exist after the
operation of unit (refrigerant and
electronic parts).
1 - INTRODUCTION
Summary of Contents for Ereba He Series
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