Anslut 014957 - Page 78

EN
78
refrigerant circuits. Do not use
leakage detection equipment
with a naked ame.
Leakage detection
The following leakage detection
methods can be used for
dehumidiers with ammable
refrigerant. Electronic leakage
detectors can be used to detect
ammable refrigerant, but their
sensitivity can be insucient
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 is not a potential
source of ignition and that it
suits the refrigerant in use. The
leakage detection equipment
must be set to a suitable
percentage (max 25%) of the
lower ammable limit (LFL)
and must be calibrated to the
refrigerant in use. Leakage
detection uids are suitable for
use with most refrigerants, but
the use of detergent containing
chlorine should be avoided
because chlorine can react with
the refrigerant and corrode
copper pipes. Extinguish or
remove all naked ames 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.
Dismantling and emptying
In view of the risk of re, take all
standard procedures and praxis
if the refrigerant circuit needs
to be opened for repair or other
purposes. Follow the instructions
below.
1. Drain o the refrigerant.
2. Flush the circuit with inert
gas.
3. Empty.
4. Flush the circuit again with
inert gas.
5. Open the refrigerant circuit