Manual Sharp UL-C10EA-W (page 14 of 96) (English, German, French, Italian, Polish, Spanish)

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Room area (m) 4 11 15

Maximum charge (kg) <0.152 0.225 0.304

Prior to beginning work on systems containing ammable refrigerants,

safety checks are necessary to ensure that the risk of ignition is minimised.

For repair to the refrigerating system, the following precautions shall be

complied with 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 ammable gas or vapour being present while the work is being

performed.

General work area

All maintenance sta and others working in the local area shall be

instructed on the nature of work being carried out. Work in conned

spaces shall be avoided. The area around the workspace shall be sectioned

o. Ensure that the conditions within the area have been made safe by

control of ammable material

Checking for presence of refrigerant

The area shall be checked with an appropriate refrigerant detector prior to

and during work, to ensure the technician is aware of potentially toxic or

ammable atmospheres. Ensure that the leak detection equipment being

used is suitable for use with all applicable refrigerants, i.e. non-sparking,

adequately sealed or intrinsically safe.

Presence of re extinguisher

If any hot work is to be conducted on the refrigeration equipment or

any associated parts, appropriate re extinguishing equipment shall be

available to hand. Have a dry powder or CO2 re extinguisher adjacent to

the charging area.

No ignition sources

No person carrying out work in relation to a refrigeration system which

involves exposing any pipe work shall use any sources of ignition in such a

manner that it may lead to the risk of re or explosion.

All possible ignition sources, including cigarette smoking, should be kept

suciently far away from the site of installation, repairing, removing

and disposal, during which 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 ammable

hazards or ignition risks. "No Smoking" signs shall be displayed.

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.

Checks to the refrigeration equipment

Where electrical components are being changed, they shall be t for the

purpose and to the correct specication. 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 ammable

refrigerants:

• The actual refrigerant charge is in accordance with the room size within

which 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 to the equipment continues to be visible and legible. Markings

and signs that are illegible shall be corrected;

• 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.

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:

• 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.

Repairs to sealed components

During repairs to sealed components, all electrical supplies shall be

disconnected 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.

Particular attention shall be paid to the following to ensure that by

working on electrical components, the casing is not altered in such a

way that the level of protection is aected. This shall include damage to

cables, excessive number of connections, terminals not made to original

specication, damage to seals, incorrect tting of glands, etc.

• Ensure that the apparatus is mounted securely.

• Ensure that seals or sealing materials have not degraded to the point

that they no longer serve the purpose of preventing the ingress of

ammable atmospheres. Replacement parts shall be in accordance with

the manufacturer’s specications.

NOTE:

The use of silicon sealant can inhibit the eectiveness of some types of

leak detection equipment. Intrinsically safe components do not have to be

isolated prior to working on them.

Repair to intrinsically safe components

Do not apply any permanent inductive or capacitance loads to the circuit

without ensuring that this will not exceed the permissible voltage and

current permitted for the equipment in use.

Intrinsically safe components are the only types that can be worked on

while live in the presence of a ammable atmosphere. The test apparatus

shall be at the correct rating.

Replace components only with parts specied by the manufacturer. Other

parts may result in the ignition of refrigerant in the atmosphere from a

leak.

Cabling

Check that cabling will not be subject to wear, corrosion, excessive

pressure, vibration, sharp edges or any other adverse environmental

eects. The check shall also take into account the eects of aging or

continual vibration from sources such as compressors or fans.

Detection of ammable refrigerants

Under no circumstances shall potential sources of ignition be used in the

searching for or detection of refrigerant leaks. A halide torch (or any other

detector using a naked ame) shall not be used.

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Sharp UL-C10EA-W Manual

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