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Installation manual / eCOMFORT R32-MIL166E-0222 - 09/2022
FLAMMABLE GASES
POWERING UP A UNIT CONTAINING FLAMMABLE GAS:
Before switching on the power supply, please carry out a refrigerant leak detection using an appropriate device to ensure that there is
no refrigerant around the machine. . Please perform a refrigerant detection with a suitable and calibrated detector to ensure that there
is no gas around the unit.
ELECTRIC WIRING ON A UNIT CONTAINING FLAMMABLE GAS:
When a cable passes through a wall, be sure to use a cable gland to ensure that the cable is sealed and insulated. This insulation
prevents any electric arcs that could ignite the refrigerant if leaked.
INTERVENTION ON A UNIT CONTAINING FLAMMABLE GAS:
Before any intervention on a machine with A2L / A2 / A3 ammable uid, please carry out a refrigerant leak detection using an appro-
priate device to ensure that there is no refrigerant around the machine.
When working on a machine with ammable uid A2L / A2 / A3, do not cause sources of ammability in the area near the unit (see
above). For example: do not smoke, make phone calls, do not use walkie-talkies.
CORRECTIVE MAINTENANCE ON R32 GAS UNIT:
The following precautions, specic to this gas, must be taken when using the R32 refrigerant;
• The vacuum pump must be tted with a non-return valve or a solenoid valve and comply with R32 (A2L).
• The pressure control, draining and lling operations of the pressurized system must be carried out using the ttings specied for
this purpose and the appropriate equipment.
• Use only pipe cutters and no torches to open the pipes.
• The load must be applied in the liquid phase.
• Always use a scale to charge the refrigerant.
• Use the leak detector suitable for R32 refrigerant.
• Do not use mineral oil, only synthetic oil for boring, expanding or making connections.
• Keep the pipes closed before using them and pay close attention to any traces of humidity and dirt (dust, lings, burrs, etc.).
• Brazing must always be carried out in a nitrogen atmosphere.
• The drill bits must always be sharp.
• The refrigerant bottle must contain at least 2% of the total amount.
• The brazing operation must be performed by a professional.
WARNING:
Care must be taken to remove refrigerant from the system before cutting or unbrazing any piping with a tool suitable for use
with A2L uids.
We recommend the following protocol before any piping work:
• To avoid any risk of explosion due to the spraying of refrigerant liquid and oil, the circuit must be drained and display a relative
pressure of zero during the disassembling or debrasing of parts of the refrigerant circuit.
• Vacuum with A2L compatible equipment and recharge with dry nitrogen to allow the uid dissolved in the oil to degas.
• Repeat these operations twice.
• Once the circuit has been drained, there is a residual risk of pressure build-up by degassing the oil or due to the heat from the
exchangers. To keep the pressure at zero, the pipe connection must be bled from the low pressure side.
Vacuum procedure:
• Connect the vacuum pump to the HP line and to the BP line.
• Draw vacuum (P = 1Pa). Break the vacuum with dry nitrogen. Draw vacuum again (P = 1Pa), the residual moisture content must
be less than 50ppm.
• Perform a vacuum test (15 minutes at maximum 70Pa).
The compressors must be switched o during the vacuum test.
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