JOHNSON CONTROLS
190
FORM 150.72-NM3 (1020)
ISSUE DATE 10/05/2020
SECTION 10 – MAINTENANCE
MICROCHANNEL COIL CLEANING
The coil cleaning procedure for microchannel coils is
signicantly dierent than tube and n type coils. As
such, care must be taken to understand the dierences
to avoid damage to the microchannel coil. These
dierences require a number of DO NOT’s that must
be observed:
• DO NOT use coil cleaners or any chemical on a
microchannel coil. This can cause severe damage
to the coils.
• DO NOT use a pressure washer to clean the coils.
While it is possible to clean a coil with a pressure
washer, it’s also possible to destroy it.
• DO NOT contact the coil with a hard surface such
as a hose nozzle or metal vacuum nozzle or any
other tool.
Follow the three steps below for cleaning the coils:
1. Remove surface debris such as dirt, leaves, in-
sects, bers, etc. with a vacuum cleaner having
a soft attachment rather than a metal tube. Com-
pressed air blown from the inside out can also be
used. When brushing debris o the face of the
coil a soft bristle (not wire) brush can be used.
Do not scrape the coil with the vacuum nozzle,
air nozzle, or any other tool.
2. Rinse the coil with tap water. Do not use coil
cleaners. Rinse the coil from the inside out, run-
ning water through every passage in the heat
exchanger surface until it is clean. Use a gentle
spray from a spray nozzle with a plastic end or
put your nger on the end of the spray nozzle to
reduce impact and provide a gentle spray.
3. Because of the n geometry, microchannel coils
retain water more than tube and n style. It is
generally recommended to blow or vacuum out
the rinse water from the coils to speed drying and
prevent water pooling.
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