37
Installation and Maintenance
Service Manual
All cylinders to be used are designated for the recovered
refrigerant and labelled for that refrigerant (i.e. special
cylinders for the recovery of refrigerant).
Cylinders shall be complete with pressure-relief valve and
associated shut-off valves in good working order. Empty
recovery cylinders are evacuated and, if possible, cooled
before recovery occurs.
The recovery equipment shall be in good working order with
a set of instructions concerning the equipment that is at
hand and shall be suitable for the recovery of all appropriate
refrigerants including, when applicable, flammable
refrigerants. In addition, a set of calibrated weighing scales
shall be available and in good working order. Hoses shall be
complete with leak-free disconnect couplings and in good
condition. Before using the recovery machine, check that it is
in satisfactory working order, has been properly maintained
and that any associated electrical components are sealed to
prevent ignition in the event of a refrigerant release. Consult
manufacturer if in doubt.
The recovered refrigerant shall be returned to the refrigerant
supplier in the correct recovery cylinder, and the relevant
waste transfer note arranged. Do not mix refrigerants in
recovery units and especially not in cylinders.
If compressors or compressor oils are to be removed, ensure
that they have been evacuated to an acceptable level to make
certain that ammable refrigerant does not remain within the
lubricant.
The evacuation process shall be carried out prior to returning
the compressor to the suppliers. Only electric heating to
the compressor body shall be employed to accelerate this
process.
When oil is drained from a system, it shall be carried out
safely.
● General
That the installation of pipe-work shall be kept to a minimum.
That compliance with national gas regulations shall be
observed.
That mechanical connections made in accordance with
22.118 shall be accessible for maintenance purposes.
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