Delfield Specification Line GA Series, Original Instructions Service Manual

Page: 62 / 104

62 Part Number GA_SM 08/18
Refrigeration Section 8
Service Procedures
• Always use gas detection equipment when working on
R-290 systems
• Set the alarm to 15% of the LFL (Lower Flammability
Level)
• Make sure all ignition sources are removed from the
work area
• Maintain a 35’ area work area free of any ignition source
• Flames, sparks, and static electricity can ignite leaking
refrigerant
• Always reclaim and purge system (twice) before using
torch on system
• Always run the unit a minimum of 5 minutes before
reclaiming refrigerant
• Follow evacuation (500 microns minimum) & purging
procedures
Passive recovery
Charging with R-290
• Charging with R-290 is similar to charging systems with
hydrocarbons
• Like all blend refrigerants, R-290 systems must be
charged with liquid to maintain correct composition of
the blend
• Be sure that the unit is grounded before charging
• It is very important to take care NOT to overfill the
system
• Hydrocarbon charge sizes are typically 40% to 50% less
than that of fluorocarbons