Specialist's Manual - Gree GSY09BXAE User Manual

Specialist's Manual

The following checks shall be applied to instal-
●
lations using flammable refrigerants:
– the charge size is in accordance with the room size
within which the refrigerant containing parts are in-
stalled;
– the ventilation machinery and outlets are operat-
ing adequately and are not obstructed;
– if an indirect refrigerating circuit is being used, the
secondary circuit shall be checked for the presence
of refrigerant;
– marking to the equipment continues to be visible
and legible. Markings and signs that are illegible shall
be corrected;
– refrigerating pipe or components are installed in a
position where they are unlikely to be exposed to any
substance which may corrode refrigerant contain-
ing components, unless the components are const-
ructed of materials which are inherently resistant to
being corroded or are suitably protected against be-
ing so corroded.
Repair and maintenance to electrical compo-
●
nents shall include initial safety checks and com-
ponent 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:
●
– that capacitors are discharged: this shall be done
in a safe manner to avoid possibility of sparking;
– that no live electrical components and wiring are
exposed while charging, recovering or purging the
system;
– that there is continuity of earth bonding.
Checks to the area
●
Prior to beginning work on systems containing flamm-
able refrigerants, safety checks are necessary to
ensure that the risk of ignition is minimised. For
repair to the refrigerating system, DD.4.3 to DD.4.7
shall be completed prior to conducting work on the
system.
Work procedure
●
Work shall be undertaken under a controlled
procedure so as to minimise the risk of a flammable
gas or vapour being present while the work is being
performed.
General work area
●
All maintenance staff and others working in the
local area shall be instructed on the nature of work
being carried out. Work in confined spaces shall be
avoided.
Checking for presence of refrigerant
●
The area shall be checked with an appropriate refri-
gerant detector prior to and during work, to ensure
the technician is aware of potentially toxic or flamm-
able atmospheres. Ensure that the leak detection
equipment being used is suitable for use with all app-
licable refrigerants, i.e. non-sparking, adequately seal-
ed or intrinsically safe.
● Presence of fire extinguisher
If any hot work is to be conducted on the refrigera-
ting equipment or any associated parts, appropriate
fire extinguishing equipment shall be available to
hand. Have a dry powder or CO
adjacent to the charging area.
Ventilated area
●
Ensure that the area is in the open or that it is ad-
equately ventilated before breaking into the system
or conducting any hot work. A degree of ventilation
shall continue during the period that the work is carri-
ed out. The ventilation should safely disperse any re-
leased refrigerant and preferably expel it externally
into the atmosphere.
Checks to the refrigerating 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 mainte-
nance and service guidelines shall be followed. If in
doubt,consult the manufacturer's technical depart-
ment for assistance.
The following checks shall be applied to installa-
tions using flammable refrigerants:
- the actual refrigerant charge is in accordance with
the room size within which the refrigerant contain-
ing parts are installed;
- the ventilation machinery and outlets are operat-
ing adequately and are not obstructed;
- if an indirect refrigerating circuit is being used,the
secondary circuit shall be checked for the presence
of refrigerant;
- marking to the equipment continues to be visible
and legible. Markings and signs that are illegible
shall be corrected;
- refrigerating 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
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fire extinguisher
2