Daikin FTXM-K Series Service Manual page 9

SiBE041434E
Where electrical components are to be changed, the new components shall be fit for the
purpose and have the correct specifications.
The manufacturer's maintenance and service guidelines shall be followed at all times.
If there are any unclear points, consult the manufacturer's technical department for assistance.
The following checks shall be applied to any installation work involving R-32:
Repair and maintenance to electrical components shall include initial safety checks and
component inspection procedures. In case there is any fault that could endanger safety, no
electrical supply shall be connected to the circuit until the fault is satisfactorily dealt with.
Initial safety checks shall include:
During repairs to sealed components, all electrical supplies shall be disconnected from the
equipment being worked upon before the removal of any sealed covers, etc. If it is absolutely
necessary to have power supplied to equipment during servicing, continuously operating leak
detection shall be installed at the most dangerous point of the system in order to warn of a
potentially hazardous situation.
Particular attention shall be paid to the following: ensure that working on electrical components
does not alter the casing in such a way that affects the level of protection including damage to
cables, excessive number of connections, terminals different from the original specification,
damage to seals, incorrect fitting of glands, etc.
Ensure that the equipment is mounted securely.
Ensure that seals or sealing materials have not degraded such that they no longer serve the
purpose of preventing the ingression of flammable atmospheres. Replacement parts shall be in
accordance with the manufacturer's specifications.
The use of silicon sealant may inhibit the effectiveness of some types of leak detection
equipment. Intrinsically safe components do not have to be isolated before working on them.
Do not apply any permanent inductive or capacitance load to the circuit without ensuring that
this will not exceed the permissible voltage and current for the equipment in use.
Only intrinsically safe components can be worked on in the presence of a flammable
atmosphere.
The test apparatus shall be of correct rating.
Replace components only with parts specified by the manufacturer. Using other parts may
result in ignition of the refrigerant leaked into the atmosphere.
Check that wiring is not subject to wear, corrosion, excessive pressure, vibration, sharp edges
or any other adverse environmental effects. The check shall also take into account the effects of
ageing or continuous vibration from sources such as compressors or fans.
Checking the refrigeration equipment
• The amount of charge is in accordance with the size of the room where the refrigerant
containing parts are installed;
• The ventilation machinery and outlets are operating 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 on the equipment is visible and legible. Markings and signs that are illegible shall
be corrected;
• Refrigeration pipes or components are installed in a position where they are unlikely to be
exposed to any substance which may corrode refrigerant containing components, or the
refrigerant containing components are constructed of materials which are inherently
resistant to corrosion or are suitably protected against corrosion.
Checking electrical devices
• 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 the equipment is earthed at all times.
Repairs to sealed components
Repair to intrinsically safe components
Wiring
Safety Cautions
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