Bedienungsanleitung BEKO BP207C (Seite 14 von 312) (Deutsch, Englisch, Holländisch, Französisch, Italienisch, Spanisch)

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14 / EN Local air-conditioner / User Manual

that ths wll not exceed the permssble voltage

and current permtted for the equpment n use.

Intrnscally safe components are the only types

that can be worked on whle lve n the presence

of a flammable atmosphere. The test apparatus

shall be at the correct ratng. Replace components

only wth parts specfed by the manufacturer.

Other parts may result n the gnton of

refrgerant n the atmosphere from a leak.

2.4 Cablng

Check that cablng wll not be subject to wear,

corroson, excessve pressure, vbraton, sharp

edges or any other adverse envronmental

effects. The check shall also take nto account

the effects of agng or contnual vbraton from

sources such as compressors or fans.

2.5 Detecton of flammable

refrgerants

Under no crcumstances shall potental sources of

gnton be used n the searchng for or detecton

of refrgerant leaks. A halde torch (or any other

detector usng a naked flame) shall not be used.

2.6 Leak detecton methods

The followng leak detecton methods are

deemed acceptable for systems contanng

flammable refrgerants. Electronc leak detectors

shall be used to detect flammable refrgerants,

but the senstvty may not be adequate, or may

need recalbraton. (Detecton equpment shall

be calbrated n a refrgerant-free area.) Ensure

that the detector s not a potental source of

gnton and s sutable for the refrgerant used.

Leak detecton equpment shall be set at a

percentage of the LFL of the refrgerant and shall

be calbrated to the refrgerant employed and the

approprate percentage of gas (25 % maxmum)

s confrmed. Leak detecton fluds are sutable

for use wth most refrgerants but the use of

detergents contanng chlorne shall be avoded

as the chlorne may react wth the refrgerant

and corrode the copper ppe-work. If a leak s

suspected, all naked flames shall be removed/

extngushed. If a leakage of refrgerant s found

whch requres brazng, all of the refrgerant shall

be recovered from the system, or solated (by

means of shut off valves) n a part of the system

remote from the leak. Oxygen free ntrogen (OFN)

shall then be purged through the system both

before and durng the brazng process.

2.7 Removal and evacuaton

When breakng nto the refrgerant crcut to make

repars – or for any other purpose – con-ventonal

procedures shall be used.However, t s mportant

that best practce s followed snce flammablty

s a consderaton. The followng procedure shall

be adhered to: remove refrgerant; purge the

crcut wth nert gas; evacuate; purge agan wth

nert gas; open the crcut by cuttng or brazng.

The refrgerant charge shall be recovered nto

the correct recovery cylnders. The system shall

be “flushed” wth OFN to render the unt safe.

Ths process may need to be repeated several

tmes.Compressed ar or oxygen shall not be

used for ths task. Flushng shall be acheved by

breakng the vacuum n the system wth OFN and

contnung to fll untl the workng pressure s

acheved, then ventng to atmosphere, and fnally

pullng down to a vacuum. Ths process shall be

repeated untl no refrgerant s wthn the system.

When the fnal OFN charge s used, the system

shall be vented down to atmospherc pressure

to enable work to take place.Ths operaton s

absolutely vtal f brazng operatons on the

ppework are to take place.

2. Instructons for reparng applances contanng

R290

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