Structural Concepts Reveal NE3613RSV handleiding

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Structural Concepts

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Reveal® User Manual 17

Preventive Maintenance

Maintenance and Service Notes

WARNING! TURN OFF CASE BEFORE PERFORMING PREVENTATIVE MAINTENANCE

Removal and evacuation

• When breaking into the refrigerant circuit to make repairs-or for any other purpose-conventional procedures shall

be used. However, for ammable refrigerants it is important that the best practice be followed, since ammability is a

consideration. The following procedure shall be adhered to:

a. Safely remove refrigerant following local and national regulations;

b. Purge the circuit with inert gas;

c. Evacuate (optional for A2L);

d. Purge with inert gas (optional for A2L);

e. Open the circuit by cutting or brazing.

• The refrigerant change shall be recovered into the correct recovery cylinders if venting is not allowed by local and national

codes. For appliances containing ammable refrigerants, the system shall be purged with oxygen-free nitrogen to render

the appliance safe for ammable refrigerants. This process might need to be repeated several times. Compressed air or

oxygen shall not be used for purging refrigerant systems.

• For appliances containing ammable refrigerants, refrigerant purging shall be achieved by breaking the vacuum in the

system with oxygen-free nitrogen and continuing to ll until the working pressure is achieved, then venting to atmosphere,

and nally pulling down to a vacuum (optional for A2L). This process shall be repeated until no refrigerant is within the

system (optional for A2L). When the nal oxygen-free nitrogen change is used, the system shall be vented down to

atmospheric pressure to enable work to take place.

• Ensure that the outlet for the vacuum pump is not close to any potential ignition sources and that ventilation is available.

Charging procedures

• In addition to conventional charging procedures, the following requirements shall be followed.

a. Ensure that contamination of different refrigerants does not occur when using charging equipment. Hoses or lines

shall be as short as possible to minimize the amount of refrigerant contained in them.

b. Cylinders shall be kept in an appropriate position according to the instructions.

c. Ensure that the REFRIGERATING SYSTEM is earthed prior to charging the system with refrigerant.

d. Label the system when charging is complete (if not already).

e. Extreme care shall be taken not to overll the REFRIGERATING SYSTEM.

• Prior to recharging the system. It shall be pressure-tested with the appropriate purging gas. The system shall be lead-

tested on completion of charging but prior to commissioning. A follow up leak test shall be carried out prior to leaving the

site.

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