mundoclima MH-20-V9 Manuel D'installation Et L'utilisauter page 25

Refrigerant equipment checks
8)
If electrical components are changed, they should fit the purpose and the correct specifications.
The manufacturer's maintenance and service guidelines should be followed at all times. If in doubt,
contact the manufacturer's technical department for assistance. The following checks should be
done in installations which use flammable refrigerants:
The load quantity matches the room size within which the refrigerant parts are installed;
The ventilation machinery and outlets are functioning properly and aren't obstructed;
If an indirect refrigerating circuit is being used, the secondary circuit should be checked for the
presence of refrigerant; Equipment labels continue to be visible and legible. Labels and signs that
are illegible should be corrected;
Refrigeration pipes or components should be installed in a position where they are unlikely to be
exposed to any substance which may corrode refrigerant components, unless the components are
built with corrosive-resistant materials or are adequately protected against corrosion.
Electrical device checks
9)
Repair and maintenance of electrical components should 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 dealt with. If the fault cannot be corrected
immediately but it is necessary to continue the operation, an adequate temporary solution should
be put into place. This shall be reported to the owner of the equipment so all parties are aware.
Initial safety checks should include:
That capacitors are discharged: this should be done safely in order to avoid any sparks; That there
are no live electrical components and wiring exposed while charging, recovering or purging the
system; That there is continuity of earth bonding.
Repairing sealed components
7.
While repairing sealed components, all electrical supplies should be disconnected from the
1)
equipment prior to any removal of sealed covers, etc. However, if it is absolutely necessary to
have an electrical supply to the equipment during maintenance, then a permanently operating
form of leak detection should be available, this way a potentially hazardous situation can be
avoided.
) Particular attention should be paid to the following to ensure that by working on electrical
2)
components, the casing is not altered in such a way that the level of protection is affected. This
includes damage to cables, excessive number of connections, terminals not made to original
specification, damage to seals, incorrect fitting of glands, etc. Ensure that the unit is safely
assembled. Ensure that seals or sealing materials have not degraded to a point that they no longer
serve the purpose of preventing the ingress of flammable atmospheres. Replacement parts shall
be in accordance with the manufacturer's specifications.
NOTE: 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 prior to working on them.
Repairing intrinsically safe components
8.
Do not apply any permanent inductive or capacitive loads to the circuit without ensuring that this
will not exceed the acceptable voltage and current permitted for the equipment in use.
Intrinsically safe components are the only types that can be worked on while in the presence of a
flammable atmosphere. The meter should have an appropriate range. Component replacement
should only be done with parts specified by the manufacturer. Other parts can result in the
ignition of leaked refrigerant present in the atmosphere.
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