Equipment And Components Under Pressure; Maintenance Safety Considerations - Carrier AquaForce PUREtec 61XWHLZE 03 Installation, Operation And Maintenance Manual

1 - INTRODUCTION
Ensure good ventilation, as accumulation of refrigerant in an
enclosed space can displace oxygen and cause asphyxiation or
explosions.
Inhalation of high concentrations of vapour is harmful and may
cause heart irregularities, unconsciousness, or death. Vapour is
heavier than air and reduces the amount of oxygen available for
breathing. These products cause eye and skin irritation.
Decomposition products are hazardous.

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 particularly in the
use of flammable refrigerants.
Never clean the unit 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 preventing 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.
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.
As a consequence, in case of closing the compressor discharge
valve (condenser repair, etc.) never close simultaneously the
service valve (upstream the filter dryer in the liquid line) and
always reclaim the refrigerant in the filter dryer.
Equip the engineers that work on the unit as follows:
Personal protection
equipment (PPE)
(1)
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.
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.
OPERATING CHECKS:
Important information regarding the refrigerant used:
This product contains fluorinated greenhouse gas covered
by the Kyoto protocol.
Fluid type: R1234ze(E)
Global Warming Potential (GWP): 7 (source IPCC Assessment
Report 4)
This refrigerant is classified group 2 "non-dangerous"
according to the critera of Pressure Equipment Directive
(PED) both 97/23/CE and 2014/68/CE.
CAUTION:
• Any handling of refrigerant contained in this product
must comply with the F-Gas Directive N° 517/2014 and
any other applicable local legislation.
• Ensure that the refrigerant is never released to the
atmosphere during installation, maintenance or
equipment disposal.
• The deliberate gas release into the atmosphere is
strictly not allowed.
• If a refrigerant leak is detected, ensure that it is stopped
and repaired as quickly as possible.
• Only a qualified and certified personnel can perform
installation operations, maintenance, refrigerant circuit
leak test as well as the equipment disposal and the
refrigerant recovering.
• The gas recovery for recycling, regeneration or
destruction is at customer charge.
• The customer has to carry out periodic leak tests
In the European Union, article 2 of regulation (EU) No. 517/2014
makes these mandatory and sets their frequency. The table below
shows this frequency, as originally published in the regulation. Check
whether an inspection frequency is also set by other regulations or
standards applicable to your system (e.g. EN 378, ISO5149, etc.).
Operations
Maintenance, Welding or
service brazing
X X
X
(2)
X
X
X
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