REMKO ETF 320 Eco handleiding

Handleiding

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11

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Wiring

Lines must be checked for the

following damage:

- Damage to the insulation

- Corrosion at the contact points

- Excessive pressure on the lines

- Damage due to vibrations

- Damage due to sharp edges

- Damage due to other inu-

ences not mentioned here

Also consider the ageing of the

material and continuous vibra-

tion loads due to compressors or

fans when checking.

■

Identify combustible refriger-

ant

Do not use any potential igni-

tion source when searching

for refrigerant leaks under any

circumstance. The use of a leak

detection lamp or other similar

devices with a naked ame is not

permitted.

1. Ensure that the components

are installed correctly.

2. Ensure that sealing materi-

als are not changed in such a

way that combustible gases or

objects could penetrate into the

interior of the components.

3. Spare parts must correspond

to the manufacturer’s specica-

tions.

NOTE

The use of silicones can inuence

the eectiveness of leak detection

devices! Intrinsically safe com-

ponents must not be insulated

before starting work.

■

Leak detection methods

The following leak detection

methods are permitted for sys-

tems with combustible refriger-

ants. Electronic equipment must

be used for detecting leaks.

These must be selected with the

sensitivity matched to the situ-

ation and recalibrated if neces-

sary (calibration must take place

in a refrigerant-free environ-

ment). The leak detection device

must be adjusted to the lowest

ammability limit (LFL) of the re-

frigerant. Liquid leakage instru-

ments are permitted for most

refrigerants. Chlorinated sub-

stances are the exception here

as the chlorine in combination

with the refrigerants can cause

corrosion on the copper cables.

If a leak is detected, all potential

open ignition sources must be

removed immediately. If a leak

has been detected in the system

which requires reworking of the

piping in the form of soldering,

the system must be completely

free of refrigerant or, if possible,

the aected part disconnected

from the system using stopcocks.

The aected system parts must

be ushed with oxygen-free

nitrogen run before and during

the repair work.

■

Emptying and evacuating the

system

If the refrigerant circuit must

be opened for repairs or other

reasons, this must be carried out

in a safe and professional way. In

any event, proceed with extreme

caution since ignition may occur

at any time! Stick to the follow-

ing procedure:

1. Drain the refrigerant

2. Flush the system with insert

gas

3. Evacuate

4. Repeat steps 2 to 3 if required

5. Opening the system by cutting

or soldering

The system must be ushed with

oxygen-free nitrogen in order to

guarantee safety. The ushing

process must be repeated multi-

ple times if necessary. Do not use

compressed air or oxygen for the

ushing process! After evacuat-

ing, ushing takes place by lling

with dried nitrogen until the

operating pressure is reached

and then the system must be

evacuated again. This ushing

process must often be repeated

until there is no more refriger-

ant in the system. After the last

ushing, the system must be

brought to the ambient pres-

sure in order to start work. The

ushing process is indispensable

when soldering work is required

on the piping. Ensure that the

vacuum pump outlet is not near

an ignition source and continu-

ous ventilation is guaranteed.

■

Filling process

The following requirements for

the general specications must

also be fullled during the lling

process:

- Ensure that no contamination

occurs from other refrigerants

(residues in the lling equip-

ment).

- Keep the lines as short as pos-

sible to minimise the likelihood

of residues forming.

- Filling bottles and cylinders

must be stood upright.

- Ensure that the system is

earthed before lling.

- Label the system with the re-

frigerant type designation after

lling

- Never exceed the maximum ll

level.

The system must be checked for

leaks (pressure test!) before ll-

ing. The system must be checked

for leaks once more after ll-

ing and before commissioning.

Check for leaks again when leav-

ing the work space.

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