Anslut 026337 - Components; Leakage Detection; Leakage Detection - Flammable; Repair of Intrinsically Safe

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● Pay attention to damaged cables, terminals that deviate
from the original version, damaged seals and grommets
etc.
● Check that electrical components are firmly in place and
correctly connected.
● Check that seals and sealing compounds do not show
signs of fatigue or other damage, or otherwise they will
fail to seal the flammable atmosphere. Replacement parts
must correspond to the specifications of the
manufacturer.
Note! Silicone sealing compound can reduce the
sensitivity of some types of leakage detection systems.
Intrinsically safe components do not need to be insulated
before working on them.
10.10 Repair of intrinsically safe
components
● Do not connect inductive or capacitive loads to the
circuit without first checking that this will not exceed the
maximum voltage or current to the product.
● The intrinsically safe components are the only
components on which work can be carried out in a
flammable atmosphere when supplied with voltage.
● Check that all the testing and measuring equipment has
the right measuring range and correct specifications.
● Only use spare parts recommended by the manufacturer.
The use of other spare parts can result in the risk of
ignition of any leaking refrigerant.
10.11 Wiring
● Do a check that no cables have been subjected to
wear, corrosion, pinching, vibration, sharp edges or
other damage. Take into consideration other longterm
eects of normal material fatigue or continuous
vibration caused by compressors or fans.
10.12 Leakage detection – flammable
● Potential sources of ignition must under no
circumstances be used to detect leakage in refrigerant
circuits.
● Do not use leakage detection equipment with a naked
flame.
10.13 Leakage detection
The following leakage detection methods can be used for
products with flammable refrigerant:
10.13.1 Electronic leakage detectors
● The sensitivity of electrical leakage detectors can be
insuicient and they may need to be recalibrated.
● Calibration of leakage detection equipment must be done
in a refrigerant-free environment.
● Make sure that the leakage detection equipment suits the
refrigerant in use and that it is not a potential source of
ignition.
● The leakage detection equipment must be set to a
suitable percentage (max 25%) of the lower flammable
limit (LFL) and must be calibrated to the refrigerant in
use.
10.13.2 Leakage detection fluids
● Do not use detergents that contains chlorine. Chlorine
can react with the refrigerant and corrode the copper
pipes.
● Extinguish or remove all naked flames if leakage is
suspected.
● If refrigerant leakage that requires hard soldering is
detected, drain and contain all the refrigerant from the
system, or insulate (with stop valves) in a part of the
system at a safe distance from the leakage. Flush the
system with oxygen-free nitrogen (OFN) both before and
during the soldering work.
10.14 To dismantle and empty the
refrigerant circuit
Warning! Risk of fire. Standard procedures must be
followed if the refrigerant circuit needs to be opened for
repair or other purposes.
Warning! Do not use compressed air or oxygen to
flush the system.
1 Make sure that the vacuum pump outlet is not placed
near any sources of ignition and that the area around
the outlet is well ventilated.
2 Open the refrigerant circuit with a sharp-edged or
thermal tool.
3 Drain the refrigerant from the refrigerant circuit.
Collect the refrigerant in an approved container.
4 Flush the refrigerant circuit with oxygen-free nitrogen
gas. The oxygen-free nitrogen gas must flow in the
system until normal working pressure is reached.