Ardesto ACM-12P-R290 - Инструкция по эксплуатации - Страница 114

114

EN

used. However, it is important that best practice is fol-

lowed since flammability is a consideration. The following 

procedure shall be adhered to: 

Remove refrigerant; Purge the circuit with inert gas; Evacu-

ate; Purge again with inert gas; Open the circuit by cutting 

or brazing. 

The refrigerant charge shall be recovered into the correct 

recovery cylinders. The system shall be flushed with OFN 

to render the unit safe. This process may need to be re-

peated several times. Compressed air or oxygen shall not 

be used for this task. Flushing shall be achieved by break-

ing 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 absolutely vital if braz-

ing 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 there is ventilation available.

13. Charging procedures 

In addition to conventional charging procedures, the fol-

lowing requirements shall be followed. Ensure that con-

tamination 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 con-

tained 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 al-

ready). 

Extreme care shall be taken not to overfill the refrigeration 

system. Prior to recharging the system it shall be pressure 

tested with OFN. The system shall be leak tested on com-