10
Technical Information
Service Manual
Sign plate to protect and mark the working area.
Appropriate detectors, suitable for hydrocarbons, must be available and operational all the time. Appropriate tools and
appliances must be available and ready for operation.
Any employees need to be instructed extensively about the safety measures and the possible safety hazard.
Before starting service work on the refrigerant circuit, the existing refrigerant must
be removed. When carrying out removal of the refrigerant, the following must be
considered:
·
The recovery cylinder must be permitted for the use of R-290 (especially regarding the
pressure and the compatibility of the connectors and the valves).
·
The recovery machine must be suitable for operation with R-290. Importantly, the
recovery machine must not itself be an ignition source.
·
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It is recommended to place and then to leave the cylinder on a digital scale. Pay attention
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complete volume by liquid refrigerant.
·
The pressure must be controlled in order to ensure that the permissible pressure of the
cylinder is not exceeded at any time.
·
After filling, the cylinder must be marked with the mass and the type of refrigerant
recovered.
·
The recovery machine should be operated until the pressure reduces to 0,3 bar
absolute pressure. R-290 is soluble to oil. This may lead to a rise of pressure because the
refrigerant vaporises from oil. It may be necessary to operate the recovery machine for a
second or even a third time.
·
Small amounts of R-290 can be vented in safe manner to the environment.
·
Remaining amounts of HC absorbed by the oil can be extracted from the system using
a vacuum pump in combination with an exhaust vent hose.
·
A second “two way excess” recovery cylinder can be used in serial connection to act as
an oil-separator.
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the system.
Refrigerant Recovery
The HC leak de-
tector is indeed
a Personal
Protective
Equipment
(PPE)
device!
