Honeywell ST-20 User Manual
Honeywell Genetron®ST-20™Flush
AC & Refrigeration Flush
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ST-20 RX11
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ST-20
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2 minutes / 20 psig N2
5 minutes / 100 psig N2
Genetron ST-20 Flush for Refrigeration and Air Conditioning Systems
With the phase-out of R11, common service practice has been to purge systems with nitrogen and
rely on filter driers to clean the system instead of
flushing. Unfortunately, filter driers have limited acid
removal capacity and recommended procedures
such as acid testing and additional filter changes
are not always followed. Additionally, contaminants
downstream of the filter can cause component
damage or blockage before filtration has sufficient
Genetron ST-20 Flush uses patented technology to
provide excellent cleaning of refrigerant and A/C
systems in a very efficient and cost effective
manner. A carefully selected boiling point assures
the solvent is easily removed from the system.
Genetron ST-20 Flush is effective for use on all
HCFC and HFC systems and is compatible with
current materials of construction including common
seals and gasket materials.
cycles to remove the contaminants.
Genetron ST-20 Flush is… Comparison of Flush Solvent Performance
• A flushing agent with excellent solvency for mineral
and new generation refrigerant oils.
• Saves you time – offers faster cycle times than other
flushing agents.
• Made with the new HFC-245fa molecule which is fully
compatible with HFCs and HCFCs.
• Safe, odorless, and non-flammable.
• Used in the same way as R141b and R11.
• Quick drying due to its low boiling point.
• Compatible with most common construction materials
and commonly used plastics and elastomers.
• Especially valuable for systems which have
experienced compressor burnouts, new system
cleaning or retrofits.
• Formulated with SNAP approved components.
• Conveniently available in pressurized packaging.
• Easily purged from components when cleaning
is complete.
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