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1. If you should cut or weld the refrigerant system pipes in the process of maintain-
ing, please follow the steps as below
a. Shut down the unit and cut power supply
b. eliminate the refrigerant
c. vacuuming
d.
e.
clean it with N2 gas
cutting or welding
f. carry back to the service spot for welding
2.
● Filling the refrigerant
The refrigerant should be recycled into the specialized storage tank.
and it’s well-ventilated.
fer-
ent kinds of refrigerant won’t contaminate with each other.
another time of leak detection should be done when it’s removed.
●
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Welding
● Presence of fire extinguisher
If any hot work is to be conducted on the refrigeration equipment or any associ-
ated parts, appropriate fire extinguishing equipment shall be available to hand.
Have a dry powder or CO2 fire extinguisher adjacent to the charging area.
● Ventilated area
Ensure that the area is in the open or that it is adequately ventilated before
breaking into the system or conducting any hot work. A degree of ventilation shall
continue during the period that the work is carried out. The ventilation should
● No ignition sources
No person carrying out work in relation to a refrigeration system which involves
exposing any pipe work shall use any sources of ignition in such a manner that it
may lead to the risk of fire or explosion. All possible ignition sources, including cig-
arette smoking, should be kept sufficiently far away from the site of installation,
repairing, removing and disposal, during which refrigerant can possibly be
released to the surrounding space. Prior to work taking place, the area around the
equipment is to be surveyed to make sure that there are no flammable hazards or
ignition risks. “No Smoking” signs shall be displayed.
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