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1 - INTRODUCTION
1.2 - Equipment and components under
pressure
The units are intended to be stored and operate in an environment
where the ambient temperature must not be less than the lowest
allowable temperature indicated on the nameplate. See section
"Pressure vessels".
1.3 - Maintenance safety considerations
Refer to EN378 norm for safe use of refrigerant in machinery
rooms, especially for appropriate ventilation when using R1234ze
A2L fluid.
Engineers working on the electric or refrigeration components
must be authorized, trained and fully qualified to do so.
Never clean the chiller with a fluid at a temperature higher
than 45°C. An over temperature could generate an over
pressure and make the relief valve discharge the refrigerant.
All refrigerant circuit repairs must be carried out by a trained
person fully qualified to work on these units who must have
been:
- Trained and be familiar with the equipment and the
installation (including the refrigerant used).
- Informed of the risks of possible explosive atmospheres
and can prevent them.They also have to be informed of
the working procedure for preventing the risk of
flammable refrigerant leaking into the atmosphere as
much as possible
All welding operations must be carried out by qualified
specialists
Maintenance operation have to be done according to national
rules and regulations that apply to explosive atmospheres
(e.g. reference to EN 1127-1)
When performing service on the refrigeration circuit, ventilate
the area prior to performing any work and check for presence
of refrigerant. During service operation, continue to ventilate
the air using the machine room ventilation or temporary fans.
Before opening a refrigerant circuit, purge and consult the
pressure gauges. Reclaim the refrigerant using a proper
refrigerant reclaim device and reclaim cylinders. The
refrigerant circuit should be pumped down and then purged
with nitrogen before servicing.
During a brazing operation, the refrigerant circuit should be
purged with nitrogen. Also when servicing the refrigerant
circuit, all ignition sources should be disabled.
The insulation must be removed and heat generation must be
limited by using a wet cloth.
Any manipulation (opening or closing) of a shut-off valve must be
carried out by a qualified and authorised engineer. These
procedures must be carried out with the unit shut-down.
Greyed text does not apply to units equipped with option 330 (Low GWP A1 R-515B refrigerant)
6
NOTE: The unit must never be left shut down with the liquid
line valve closed, as liquid refrigerant can be trapped between
this valve and the expansion device (This valve is situated
on the liquid line before the filter drier). In case of presence
of a shut-off valve on the suction line (between evaporator
and compressor -factory option n°92), never close at the same
time the shut-off valve situated on the discharge line (between
compressor and condenser). One exception can be made in
case of compressor removal from the refrigerant circuit.
Equip the engineers that work on the unit as follows:
Personal protection
(1)
equipment (PPE)
Handling
Protective gloves,
eye protection,
safety shoe,
protective clothing.
Ear protection.
Filtering respirator.
(1) We recommend to follow the instructions in EN 378-3.
(2) Performed in the presence of A1 refrigerant according to EN 378-1.
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 using the
disconnect switch(es) in the control box(es).
If any maintenance operations are carried out on the unit,
lock the power supply circuit in the open position ahead of
the machine.
AT T E N T I O N : T h e f r e q u e n c y v a r i a t o r s u s e d i n t h e
30XW-VZE/30XWHVZE units are equipped with capacitor
batteries with a discharge time of twenty (20) minutes after
disconnecting the power.After disconnecting the power to
the control box, wait twenty minutes before opening the
control box.
If the work is interrupted, always ensure that all circuits are still
deenergized before resuming the work.
ATTENTION: Even if the unit has been stopped, 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.
CAUTION: INTERNAL FAILURE HAZARD
An internal failure in the frequency converter can result in
serious injury, when the frequency converter is not properly
closed.
Ensure that all safety covers are in place and securely
fastened, before applying power.
Operations
Maintenance,
Welding or
service
brazing
X
X
X
(2)
X
X
X
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