Toyotomi SEN ion TDE-16SGI21 User Manual page 66

DEHUMIDIFIER
For appliances containing fl ammable refrigerants, the system shall be "fl ushed"
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.
For appliances containing fl ammable refrigerants, fl ushing shall be achieved
by breaking the vacuum in the system with OFN and continuing to fi ll until the
working pressure is achieved, then venting to atmosphere, and fi nally pulling
down to a vacuum.
This process shall be repeated until no refrigerant is within the system. When
the fi nal OFN charge is used, the system shall be vented down to atmospheric
pressure to enable work to take place. This operation is absolutely vital if
brazing operations on the pipe-work are to take place.
Ensure that the outlet for the vacuum pump is not close to any ignition sources
and that ventilation is available.
CHARGING PROCEDURES
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.
• Cylinders shall be kept upright.
• Ensure that the refrigeration system is earthed prior to charging the system
with refrigerant.
• Label the system when charging is complete (if not already).
• Extreme care shall be taken not to overfi ll the refrigeration system. Prior
to recharging the system, it shall be pressure-tested with the appropriate
purging gas. The system shall be leak-tested on completion of charging
but prior to commissioning. A follow up leak test shall be carried out prior to
leaving the site.
DECOMMISSIONING
Before carrying out this procedure, it is essential that the technician is
completely familiar with the equipment and all its detail. It is recommended
good practice that all refrigerants are recovered safely. Prior to the task being
carried out, an oil and refrigerant sample shall be taken in case analysis is
required prior to re-use of reclaimed refrigerant.
It is essential that electrical power is available before the task is commenced.
66
GB