Manual Inventor V5MFI32-60 (page 41 of 136) (English)

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 Page 40

9. Checks to electrical devices

10. Repairs to sealed components

marking 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.

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 circuits shall be checked

for the presence of refrigerant; marking to the equipment continues to be visible and

legible.

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, and 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 there no live electrical components and wiring are exposed while charging, recovering

or purging the system;

that there is continuity of earth bonding.

10.1 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.

10.2 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 specication, damage to seals, incorrect tting 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 ammable atmospheres. Replacement parts shall

be in accordance with the manufacturer s specications.

NOTE: The use of silicon sealant may inhibit the effectiveness of some types of leak detection

equipment. Instrinsically safe components do not have to be isolated prior to working on them.

11. 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. Intrinscially 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.

 Page 41

The refrigerant charge shall be recovered into the correct recovery cylinders. The system shall be

ushed with OFN to render the unit safe. This process may need to be repeated several times.

Compressed air or oxygen shall not be used for this task.

12. 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.

15. Removal and evacuation

When breaking into the refrigerant circuit to make repairs of for any other purpose

conventional procedures shall be used, However, it is important that best practice is followed

since ammability is a consideration. The following procedure shall be adhered to:

remove refrigerant;

purge the circuit with inert gas;

evacuate;

purge again with inert gas;

open the circuit by cutting or brazing.

13. 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 ame)

shall not be used.

14. Leak detection methods

The following leak detection methods are deemed acceptable for systems containing ammable

refrigerants. Electronic leak detectors shall be used to detect ammable 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. 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 conrmed. Leak detection uids 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 ames shall be removed or extinguished. If a leakage of refrigernat

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 the brazing process.

Flushing shall be achieved by breaking the vacuum in the system with OFN and continuing to

ll until the working pressure is achieved, then venting to atmosphere, and nally pulling down

to a vacuum. This process shall be repeated until no refrigerant is within the system.

When the nal OFN charge is used, the system shall be vented down to atmospheric pressure

to enable work to take place. This operation is absolutely vital if brazing operations on the

pipe-work are to take place.

Ensure that the outlet for the vacuum pump is not closed to any ignition sources and there

is ventilation available.

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