Quantech
197
Section 10: Maintenance
Form QTC3-NM1
Issue date: 12/19/2023
10
Environment Guard Premium coils are
coated with a black epoxy coating..
1. Remove surface debris such as dirt, leaves, in-
the face of the coil, you can also use a soft bristle
brush (not wire). Do not scrape the coil with the
vacuum nozzle, air nozzle, or any other hard tool.
2. Rinse the coil with potable tap water. Use a gentle
spray from a spray nozzle with a plastic end. Do
not contact the coil with the hose nozzle. Rinse
the coil by running water through every passage
in the heat exchanger surface until it is clean. For
QTC3 chiller, rinse the microchannel coils from
the inside out through the access window on the
V-Panel and the round the tube coils from the out-
side.
3. Apply a coil cleaning solution approved by Quan-
tech. Quantech approves the use of RectorSeal
brand GulfClean
TM
coil cleaner, or equivalent, on
Environment Guard Premium microchannel coils
only. Coil cleaning solution is available from
Johnson Controls Aftermarket Parts Centers in all
global regions. Mix the correct amount of cleaner
solution and water in accordance with the manu-
facturer’s directions on the container. Use a hand-
held pump sprayer to apply the mixed cleaner so-
lution on the coils. Ensure that the entire surface
of the coils is wetted with the solution.
Allow the cleaning solution to remain on each of
the coils for approximately 10 mins.
4. Repeat the water rinse as described in Step 2 to
remove the cleaning solution.
5. Apply a salt reducer solution approved by Quan-
tech. Quantech approves the use of RectorSeal
brand GulfClean
TM
salt reducer, or equivalent,
on Environment Guard Premium microchannel
coils only. Salt reducer solution is available from
Johnson Controls Aftermarket Parts Centers in all
global regions. Mix the correct amount of salt re-
ducer solution and water in accordance with the
manufacturer’s directions on the container. Use a
hand-held pump sprayer to apply the solution on
the coils. Ensure that the entire surface of the coils
is wetted with the solution.
Allow the salt reducer solution to remain on each
of the coils for approximately 10 min.
6. Repeat the water rinse as described in Step 2
to remove the salt reducer solution. Ensure that
cleaning solution and salt reducer solution from
the coils.
7. It is important to remove any excess water trapped
The condenser fans on the chiller can be run after
-
move any excess water by blowing air through the
coils with a hand-held blower or vacuum.
8. Visually inspect the Environment Guard Premium
e-coating on the microchannel coils for any dam-
age, degradation or bare spots. If touch-up of the
coating is necessary, follow the applicable steps in
the following section to touch-up the e-coat after
cleaning.
Steps to touch-up small sections of finned
coil surface on microchannel coils
1. Use the touch-up paint to touch up small sections
of the coil surface. Shake the aerosol can thor-
oughly until the mixing ball rattles, then continue
to shake the can for 2 min.
2. Using slow dusting passes, spray the contents of
the can in both horizontal and vertical patterns
around 4 in. to 6 in. from the impacted section of
the coil surface for an even coating.
Steps to touch-up end (dead) tubes or
condenser coil headers on microchannel
coils
In cases where e-coating on the end tubes or condenser
coil headers is showing signs of degradation, you must
use 2-part urethane mastic for touch-up. Do not use
2-part urethane Mastic on finned coil surface.
Do not use 2-part Urethane Mastic on
finned coil surface. Using Urethane
Mastic on nned surfaces can result in
blockage of n sections which will lead
to reduction in air ow across the coil.
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