DC Inverter U-match Series Duct Type Unit
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explosion. All possible ignition sources, including cigarette smoking, should be kept
sufficiently far away from the site of installation, repairing, removing and disposal,
during which flammable 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.
5.4.1.7 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 safely
disperse any released refrigerant and preferably expel it externally into the
atmosphere.
5.4.1.8 Checks to the Refrigeration Equipment
Where electrical components are being changed, they shall be fit for the
purpose and to the correct specification. At all times the manufacturer’s
maintenance and service guidelines shall be followed. If in doubt consult the
manufacturer’s technical department for assistance.
The following checks shall be applied to installations using flammable
refrigerants:
(1) The charge size is in accordance with the room size within which the
refrigerant containing parts are installed.
(2) The ventilation machinery and outlets are operating adequately and are
not obstructed.
(3) If an indirect refrigerating circuit is being used, the secondary circuit shall
be checked for the presence of refrigerant.
(4) Marking to the equipment continues to be visible and legible. Markings
and signs that are illegible shall be corrected.
(5) Refrigeration pipe or components are installed in a position where they
are unlikely to be exposed to any substance which may corrode
refrigerant containing components, unless the components are
constructed of materials which are inherently resistant to being corroded
or are suitably protected against being so corroded.
