Mestic BA-2600 handleiding

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Handleiding

Presence of fire extinguisher:

If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate fire extinguishing equipment shall be available

to hand. Have a dry powder or CO2 fire 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 that contains or has contained

flammable refrigerant shall use any sources of ignition in such a manner that it may lead to the risk of fire or explosion. All possible ignition

sources, including cigarette smoking, should be kept sufficiently far away from the site of installation, repairing, removing and disposal, during

which flammable 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 flammable hazards or ignition risks.

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 fit for the purpose and to the correct specification. 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 flammable refrigerants:

-- the charge size 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 equip- ment 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 affected. This shall include damage to cables, excessive number of connections, terminals not made to original specification,

damage to seals, incorrect fitting of glands, etc.

Ensure that apparatus is mounted securely.

Ensure that seals or sealing materials have not degraded such that they no longer serve the purpose of preventing the ingress of flammable

atmospheres. Replacement parts shall be in 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.

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

flammable atmosphere. The test apparatus shall be at the correct rating. Replace components only with parts specified 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 effects.

The check shall also take into account the effects of aging or continual vibration from sources such as compressors or fans.

Detection of flammable 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 flame) shall not be used.

Leak detection methods:

The following leak detection methods are deemed acceptable for systems containing flammable refrigerants.

Electronic leak detectors shall be used to detect flammable refrigerants, but the sensitivity may not be adequate, or may need re-

calibration. (Detection equipment shall be calibrated in a refrigerant-free area.)

Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used. Leak detection equipment shall be set at a

percentage of the LFL of the refrigerant and shall be calibrated to the refrigerant employed and the appropriate percentage of gas (25 % maximum)

is confirmed.

Leak detection fluids are suitable for use with most refrigerants but the use of detergents containing chlorine shall be avoided as the chlorine may

react with the refrigerant and corrode the copper pipe-work. If a leak is suspected, all naked flames shall be removed / extinguished. If a

leakage of refrigerant is found which requires brazing, all of the refrigerant shall be recovered from the system, or isolated (by means of shut off

valves) in a part of the system remote from the leak. Oxygen free nitrogen (OFN) shall then be purged through the system both before and during

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