Bedienungsanleitung Kaysun KP-35 HP10 (Seite 7 von 20) (Englisch)

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That there no live electrical components and wiring

are exposed while charging, recovering or purging the

system;

That there is continuity of earth bonding.

7. Repairs to sealed components

1) During repairs to sealed components, all electrical

supplies shall be disconnected from the equipment be-

ing worked upon priot to any removal of sealed covers,

etc. If it is absolutely necessary to have an electrical

supply to equipment during servicing, then a perma-

nently operating form of leak detection shall be located

at the most critical point to warn of a potentially hazar-

dous situation.

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 ca-

bles, excessive number of connections, terminals not

made to original speciﬁcation, damage to seals, inco-

rrect ﬁtting of glands, etc.

Ensure that apparatus is mounted securely.

Ensure that seals or sealing materials have not de-

graded such that they no longer serve the purpose of

preventing the ingress of ﬂammable atmospheres. Re-

placement parts shall be in accordance with the manu-

facturer’s speciﬁcations.

NOTE: The use of silicon sealant may inhibit the effec-

tiveness of some types of leak detection equipment.

Intrinsically safe components do not have to be isola-

ted prior to working on them.

8. 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 com-

ponents onlu with parts speciﬁed by the manufacturer.

Other parts may result in the ignition of refrigerant in

the atmosphere form a leak.

9. Cabling

Check that cabling will not be subject to wear, co-

rrosion, excessive pressure, vibration, sharp edges or

any other adverse environmental effects. The check

shall also take into account the effects of aging or con-

tinual vibration from sources such as compressors or

fans.

10. 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.

11. Lead detection methods

The following leak detection methods are deemed

acceptable for systems containing ﬂammable refrige-

rants.

Electronic leak detectors shall be used to detect ﬂam-

mable refrigerants, but the sensitivity may not be ade-

quate, or may need re-calibration. (Detection equip-

ment 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 appropiate percentage

of gas (25% maximum) is conﬁrmed. Lead detection

ﬂuids are suitable for use with most refrigerants but

the use of detergents containing chlorine shall be

avoided ad the chlorine may react with the refrigerant

and corrode the copper pipe-work. If a leak is suspec-

ted, all naked ﬂames shall be removed/extinguished.

If a leakage of refrigerat is found which requires bra-

zing, 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.

12. Removal and evacuation

When breaking into the refrigerant circuit to make

repairs or for any other purpose conventional proce-

dures shall be used. However, it is important that best

practice is followed since ﬂammability is a conside-

ration. 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.

The refrigerant charge shall be recovered into the co-

rrect recovery cylinders. The system shall be ﬂushed

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.

Flushing shall be achieved by breaking the vacuum

in the system with OFN and continuing to ﬁll until the

working pressure is achived, then venting to atmos-

phere, and ﬁnally pulling down to a vacuum. This pro-

cess shall be repeated until no refrigerant is within

the system. When the ﬁnal OFN charge is used, the

system shall be vented down to atmospheric pres-

sure 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 outler for the vacuum pump is not

close to any ignition sources and there is ventilation

available.

13. Charging procedures

In addition to conventional charging procedures, the

following requirements shall be followed.

Ensure that contamination of different refrigerants

does not occur when using charging equipment. Ho-

ses or lines shall be as short as possible to minimise

the amount of refrigerant contained in them.

Cylinders shall be kept upright.

Warnings (for using R-290 refrigerant only)

Kaysun KP-35 HP10 Seite 7

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