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Part No. 30911 Rev. A September 2020
- 38 -
Visair Refrigerated Cabinets
Venting R-290
VISAIR CABINETS
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APPENDIX A
R-290 Refrigerant
Venting
Procedures
1.
Do NOT vent hydrocarbon refrigerants inside a building under any
circumstance (SAFETY RISK).
2.
Venting hydrocarbon refrigerants to a public area or where people are
unaware of the procedure is not permitted.
3.
When venting R-290 YOU MUST make everyone in the immediate area
aware that you are venting a flammable gas to the atmosphere.
4.
Ensure there are no ignition sources within a 10 ft. perimeter of the area
you are venting R-290. Be aware that E-cigarettes or similar electronic
devices could be a source an ignition.
5.
Ensure that all local legislation/regulations addressing safety of
hazardous or flammable substances are satisfied.
6.
Ensure you are not venting R-290 into a low-lying area. R-290 is heavier
than air and can accumulate in floor drains, grease traps, piping troughs,
etc.
7.
After venting, purge with Nitrogen through the system for a minimum of
10 seconds.
System Evacuation
VISAIR CABINETS
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APPENDIX A
R-290 Refrigerant
Preliminary
Tasks
Prior to sealing up the system make sure you have a sufficient amount of
service access tubing remaining for service in the future.
1.
Remove the crimped tubing and piercing/saddle valve from the process
tube.
2.
Extend the process tube a minimum of 30cm.
3.
Crimp and braze the process tube extension.
4.
Install piercing/saddle valve just before last crimp.
After the system has been sealed and leak checked, it is necessary to evacuate
it in order to remove air, moisture, and unwanted residual refrigerant.
NOTE
Technician must use tube cutter instead of torch when removing
refrigeration system components.