APC INROOM ACPSC3000 Instrucciones de operaciones descargar pdf (Pagina 39)

InRoom CW/DX – Operating Instructions 39

6.3.2.2 Routing refrigerant-conducting pipes

Note:

Never route pipelines through rooms such as conference rooms, restrooms, ofﬁ ces etc.

Pipe mountings are to be provided in accordance with state and local codes. The pipe mountings are to be

insulated against vibrations. The ﬁ rst pipe mounting behind the unit and upstream of the condenser should

be ﬂ exible. So that the pressure lines can expand, the pipe mountings are to be attached according to state

and local codes.

- All copper pipes which pass through masonry must be insulated in this area so that the pipes are pro-

tected from damage and a certain ﬂ exibility is retained.

- For routing, use only copper pipes which correspond to the national regulations. Sealing caps or ends

added as ﬂ ux must be meticulously clean and dry and meet the requirements of refrigeration enginee-

ring.

- Before commencing with routing the pipelines, ensure that the pipes are dry and clean inside by checking

whether the sealing caps are seated on the pipe ends and by blowing through the pipes with nitrogen.

If the sealing caps are no longer seated on the pipe ends, the pipes must be cleaned with a clean non

fraying cloth and a spiral and then blown through with nitrogen to remove the remaining dirt.

Furthermore ensure that the remaining pipe is sealed with a plug after cutting off pipe ends.

- Pipes for refrigerant must always be cut to length with a pipe cutter and then brought to the correct inside

diameter by slightly expanding or calibrating the pipe.

Caution:

Sawing refrigerant pipes is not permitted as the debris cannot be completely removed and

blockages can occur in the control components or the compressor may be irreparably

damaged. The same can also occur as a result of contaminated pipes.

- If copper pipes are ﬂ ared, the taper of the tube ﬂ aring tool must be coated lightly with refrigeration oil to

prevent a burr from occurring on the copper pipe during the ﬂ aring process and then entering the pipe.

According to EN 378, pipes with a diameter less than 9 mm (3/8 in) and greater than 19 mm (3/4 in) may

not be ﬂ ared.

- Refrigerant-conducting pipes may only be brazed under nitrogen so that no oxidation occurs on the inside

of the pipes. Oxidation contaminates pipelines.

Before the ﬁ nal connection is brazed, a screwed connection must be released at the appropriate point so

that no pressure occurs in the pipe system.

Caution:

After brazing, do not forget to retighten the screwed connection which has been released.

Once the pipework installation is ﬁ nished, it is mandatory that the system is checked for leaks and for pres-

sure resistance. This must be carried out as follows:

- The system is ﬁ lled with dry nitrogen up to the maximum nominal pressure.

- The system is shut off, the valve in the system is closed and the nitrogen bottle is removed.

- Each connection (including screwed connections) is checked for leaks by brushing on a liquid. In parallel

with this check, connect a pressure gauge to the unit, then record the pressure. After a period of time that

is appropriate for the size of the system, check the pressure gauge again. A large variation in pressure

indicates a leak.

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APC INROOM ACPSC3000 Instrucciones de operaciones Pagina 39