DC Inverter U-match Series for R410A Unitary Split Air Conditioner
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The following checks shall be applied to installations using flammable
refrigerants:
(1) The ventilation machinery and outlets are operating adequately and are not
obstructed.
(2) If an indirect refrigerating circuit is being used, the secondary circuit shall be
checked for the presence of refrigerant.
(3) Marking to the equipment continues to be visible and legible. Markings and
signs that are illegible shall be corrected.
(4) 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.
4.4.1.4 Checks to electrical devices
Repair and maintenance to electrical components shall include initial safety
checks and component inspection procedures. If a fault exists that could
compromise safety, then no electrical supply shall be connected to the circuit until it
is satisfactorily dealt with. If the fault cannot be corrected immediately but it is
necessary to continue operation, an adequate temporary solution shall be used.
This shall be reported to the owner of the equipment so all parties are advised.
Initial safety checks shall include:
(1) That capacitors are discharged: this shall be done in a safe manner to avoid
possibility of sparking.
(2) That no live electrical components and wiring are exposed while charging,
recovering or purging the system.
(3) That there is continuity of earth bonding.
4.4.2 Repairs to Sealed Components
4.4.2.1 Electrical Safety
From the equipment being worked upon prior to any removal of sealed covers,
etc. If it is absolutely necessary to have an electrical supply to equipment during
servicing, then a permanently operating form of leak detection shall be located at
the most critical point to warn of a potentially hazardous situation.
