3
•
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.
LABELLING
•
The equipment must be labelled so as to specify that it is out of order and that the
refrigerant has been drained.
•
The label must be dated and signed.
•
For appliances containing a flammable refrigerant, check that labels are placed on
the equipment stating that it contains a flammable refrigerant.
RECOVERY
•
When draining the refrigerant for maintenance or decommissioning, best practices
should be followed in order to safely drain all of the refrigerant.
•
When transferring refrigerant to a cylinder, make sure that you use a recovery
cylinder that is compatible with the refrigerant. Make sure that the correct number
of cylinders are provided for recovering all of the refrigerant. All cylinders used must
be intended for the recovery of refrigerant and must be labelled for this specific
refrigerant. The cylinders must be equipped with a vacuum valve and a stop gate
in good working order. Empty collection cylinders are drained and, where possible,
cooled before recovery.
•
The recovery equipment must be in good working order, the instructions for using the
equipment must be within reach and the equipment must be compatible for use with
the refrigerant concerned, including, where appropriate, a flammable refrigerant.
Moreover, a set of calibrated scales must be available and in good working order.
The pipework must be complete, have no leaks or disconnected connectors, and
must be in good condition. Before using the recovery unit, check that it is in good
working order, that it has been well maintained and that the associated electric
components are sealed so as to prevent any risk of fire in the event of refrigerant
