User Manual

2
Information on Servicing
Leak detection fluids are suitable for use with most refrigerants but the use of
detergents containing chlorine shall be avoided as the chlorine may react with the
refrigerant and corrode the copper pipe-work.
If a leak is suspected, all naked flames shall be removed/extinguished.
 
 
 
 
 
When breaking into the refrigerant circuit to make repairs – or for any other purpose –
conventional procedures shall be used. However, for flammable refrigerants it is
important that the best practice is followed since flammability is a consideration.
ng. The following
procedure shall be adhered to:
The refrigerant charge shall be recovered into the correct recovery cylinders. For
appliances containing FLAMMABLE REFRIGERANTS, the system shall be “flushed”
with OFN to render the unit safe. This process may need to be repeated several
times. Compressed air or oxygen shall not be used for purging refrigerant systems.
Ensure that the outlet for the vacuum pump is not close to any ignition sources
and that ventilation is available.
In addition to conventional charging procedures, the following requirements shall
be followed.
 Ensure that contamination of different refrigerants does not occur when using
charging equipment. Hoses or lines shall be as short as possible to minimise the
amount of refrigerant contained in them.
For appliances containing FLAMMABLE REFRIGERANTS, flushing shall be
achieved by breaking the vacuum in the system with OFN and continuing to fill
until the working pressure is achieved, then venting to atmosphere, and finally
pulling down to a vacuum. This process shall be repeated until no refrigerant is
within the system. When the final OFN charge is used, the system shall be vented
down to atmospheric pressure to enable work to take place. This operation is
take place.
l of the refrigerant shall
be recovered from the system, or isolated (by means of shut off valves) in a part of
the system remote from the leak. For appliances containing FLAMMABLE
REFRIGERANTS, oxygen free nitrogen (OFN) shall then be purged through the

Removal and evacuation
Charging procedures