Hitachi RAW-XH07CA Installation & Operation Manual page 5

R32 SAFETY PRECAUTIONS
Max. Refrigerant charge
Model number
RAW-XH07CA
RAW-XH10CA
RAW-XH13CA
RAW-XH18CA
RAW-XH24CA
- Based on IEC 60335-2-40, there is no restriction for the minimum installation floor area since the
refrigerant charges is less than 1.842kg.
Removal and evacuation
- The refrigerant charge shall be recovered into the correct recovery cylinders and the system shall be
"flushed" with oxygen free nitrogen (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.
- 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.
- The vacuum pump should not near to any ignition sources and ensure that ventilation is available at
all times
Charging procedures
- 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 labelled).
- Extreme care shall be taken not to overfill 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.
- 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.
- Electrical power must be available before the task is commenced.
R32 Max. Refrigerant charge
(kg)
0.43
0.43
0.435
0.63
0.71
iv
Minimum installation height
750mm
750mm
750mm
750mm
750mm