4
must be checked, as well as the absence of any traces of refrigerant.
•
During the appliance's annual sealing test in accordance with applicable legislation,
the high and low pressure switches must be checked to ensure that they are
securely fastened to the cooling circuit and that they cut off the electrical circuit
when tripped.
•
During maintenance work, ensure there are no traces of corrosion or oil around
the cooling components.
•
Before beginning work on the cooling circuit, stop the appliance and wait for a few
minutes before fitting the temperature and pressure sensors. Some elements such
as the compressor and piping may reach temperatures in excess of 100 °C and high
pressures with the consequent risk of severe burns.
TROUBLESHOOTING
•
All brazing must be carried out by qualified brazers.
•
Replacement pipes must always be made of copper in compliance with standard
NF EN 12735-1.
•
Leak detection; pressure test:
-
never use oxygen or dry air, risk of fire or explosion,
-
use dry nitrogen or the mixture of nitrogen and refrigerant indicated on the
information plate,
-
the test pressure for both the high and low pressure circuits must not exceed 42
bar in cases where the appliance is equipped with the optional pressure gauge.
•
The high pressure circuit pipes are made of copper and have a diameter equal to or
greater than 1’’5/8. A certificate as indicated in §2.1 in compliance with standard
NF EN 10204 must be requested from the supplier and filed in the installation's
technical file.
•
Technical data relative to the safety requirements of the various applicable directives
are indicated on the information plate. All this information must be recorded in the
appliance's installation manual, which must be kept in its technical file: model,
code, serial number, maximum and minimum OT, OP, year of manufacture, CE
marking, manufacturer’s address, refrigerant and weight, electrical parameters,
thermo-dynamic and acoustic performance.
MAINTENANCE: WARNINGS CONCERNING APPLIANCES CONTAINING R32
REFRIGERANT (models PM40 MD1, MD2, MD3, MD4, MD5, TD7 & TD8)
Area check
•
Before starting work on systems containing flammable refrigerants, safety checks
must be carried out to guarantee a minimal ignition risk.
Work procedure
• The work must be carried out according to a controlled procedure in order to
reduce the risks of releasing a flammable gas or vapour while working.
General work area
•
All maintenance staff and other personnel working in the surrounding area must
be made aware of the work carried out. Work conducted in enclosed areas must
be avoided.
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