Area checks
Before work is started on systems that
contains combustible refrigerants, safety
checks must be performed to ensure that
the ignition risk is kept to a minimum.
Working method
The work must be carried out in a con-
trolled way to minimise the risk of contact
with combustible gas or liquid during the
work.
General for the working range
All maintenance staff and those who work
in close proximity to the product must be
instructed which type of work is to be car-
ried out. Avoid carrying out work in en-
closed spaces. The area surrounding the
worksite must be cordoned off. Ensure that
the area is made safe by removing combust-
ible material.
Check for the presence of refrigerant
Check whether there is refrigerant in the
area using a suitable refrigerant detector
prior to and during work, to notify the ser-
vice technician whether there is a possible
flammable atmosphere or not. Ensure that
the refrigerant detector is suitable for
combustible refrigerant, i.e. does not gen-
erate sparks or cause ignition in any other
way.
Presence of fire extinguishers
If hot work is carried out on the heat pump,
a powder or carbon dioxide fire extinguish-
er must be to hand.
Absence of ignition sources
Those who carry out work with refrigerant
system connections, including exposing
pipes that contain or have contained com-
bustible refrigerant, may not use potential
ignition sources in such a way that that can
lead to risks of fire or explosions.
All potential ignition sources, including ci-
garette smoking, should be kept at a safe
distance from the service work area where
combustible refrigerant can leak out. Be-
fore carrying out work, the area surround-
ing the equipment must be checked to
ensure that there are no ignition risks. "No
smoking" signs must be displayed.
Ventilated area
Ensure that the work is carried out out-
doors or that the work area is ventilated
before the system is opened and before
any hot work is carried out. The area must
be ventilated whilst the work is being car-
ried out. There must be ventilation around
any refrigerant that comes out, which
should be routed outdoors.
Checking cooling equipment
If electrical components are replaced, the
replacement parts must be fit for purpose
and have the correct technical specifica-
tions. Always follow the manufacturer's
guidelines regarding maintenance and
servicing. Contact the manufacturer's
technical department in the event of any
doubts.
The following checks must be carried out
for installations that use combustible refri-
gerants.
■
The filling quantity is appropriate for the
size of the space where the parts that
contain refrigerant are installed.
■
Ventilation equipment and outlet work
correctly and without obstructions.
■
If an indirect refrigerant circuit is used,
check whether the secondary circuit con-
tains refrigerant.
■
All markings of equipment are visible and
clear. Markings, signs and similar that are
not clear must be replaced.
5Chapter 1 | Important informationNIBE F470
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