Brochure
Mainstream Engineering Corporation
1-800-866-3550
www.qwik.com
MKTG000045 / 2000802
Qwik System Flush
®
Application Bulletin (con’t)
(for Abbreviated Instructions see page 1)
Page 4 of 5
1. Recover any refrigerant in the system.
2. Open the system and cut out the following
components:
lter-drier(s),
expansion valve(s),
compressor(s).
In a burnout / changeout, the lter-drier
and compressor would need to be replaced
anyway.
3. Place a waste container where both nitrogen
and ush carrying waste will be exiting the
system (see equipment required #5).
4. Connect the nitrogen gas supply (see equipment required #6) to a are tting (see equipment
required #4) and perform a nitrogen purge at each area that you intend to ush. Let the nitrogen
ow for at least 5 minutes or longer if debris continues to exit.
5. The ideal use for the nitrogen is to physically blow as much contaminated oil out of the system
that you can. Use your judgement to open the system anywhere you expect oil is trapped, and
then use the nitrogen to blow this oil and other debris from the system. Never purge through an
expansion device (capillary tube, orice plate, TXV, etc.) as this will likely clog the device.
6. Next, use Qwik System Flush® to clean wherever you used nitrogen as a purge (see gure -1).
Once again, if it is practical, the best method for cleaning piping or system components is to
replace all the piping and system components. However, if replacement is impractical, it has
to be cleaned by something more eective than nitrogen. A nitrogen purge is not capable of
removing all of the contaminated oil from the inside surface of a line set and should only be the
start of a thorough cleaning process.
7. After you use nitrogen to purge the system, the most eective way to remove the remaining
residual oil from the pipe lines is to use Mainstream’s Qwik System Flush® (see gure -1).
Remember that it is still necessary to perform a nitrogen purge before and after using
Qwik-SF®. The Qwik System Flush® solvent has excellent absorption capacity, (see test results
at www.qwik.com) therefore, a relatively small amount of Qwik System Flush® is needed. The
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