Manual MaxxHome 20736 - AC12M (page 8 of 26) (English)

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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.

1.9 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 there no live electrical components and wiring are

exposed while charging, recovering or purging the system; that there is continuity of earth bonding.

2 REPAIRS TO SEALED COMPONENTS

2.1 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.

2.2 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 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 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.

3 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.

4 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.

5 DETECTION OF FLAMMABLE REFRIGERANTS

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

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MaxxHome 20736 - AC12M Manual

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