York YLAA0041 Installation Operation & Maintenance page 200

Section 10: Maintenance
• Do not contact the coil with a hard object such as
a hose nozzle, hard vacuum nozzle, or any other
tool. Hard objects or tools can cause mechanical
damage to the coil material and protective coat-
ings on the coil.
• Do not use caustic or acidic cleaning solutions on
coils. Only use cleaning solutions approved by
Johnson Controls.
The required cleaning procedure is different depending
on the type of coil and protective coating supplied with
the coil. This section describes the correct procedures
to maintain the integrity of each type of coil.
Cleaning procedure required for standard and
environment guard microchannel coils
You must clean standard and environment guard mi-
crochannel coils following this procedure at least once
every 3 months to ensure that the integrity of the coils
and the warranty of the coils are maintained. In envi-
ronments where coils become heavily fouled or there
are high levels of pollution or corrosive elements, a
monthly frequency of cleaning is recommended. Refer
to the Johnson Controls Microchannel Heat Exchang-
er Application Guide (Form 150-12-AD1) for further
details on the classification of polluted and corrosive
environments.
Proper care must be taken to ensure that
cleaning agents and water are not sprayed
directly onto electrical components and
wiring in the V-panels and the chiller.
Standard and Environment Guard coils
are grey/silver color.
1. Remove surface debris such as dirt, leaves, in-
sects, or fibers with a vacuum cleaner having a
soft brush attachment. When brushing debris off
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
200
in the heat exchanger surface until it is clean. For
YLAA 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 John-
son Controls. Johnson Controls approves the use
of RectorSeal brand GulfClean
equivalent, on microchannel coils. Coil cleaning
solution is available from Johnson Controls Af-
termarket Parts Centers in all global regions. Mix
the correct amount of cleaner solution and water
in accordance with the manufacturer's directions
on the container. Use a hand-held pump sprayer
to apply the mixed cleaner solution 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 min.
4. Repeat the water rinse as described in Step 2 to
remove the cleaning solution.
5. It is important to remove any excess water trapped
in the coils immediately after the final water rinse.
The condenser fans on the chiller can be run after
the final water rinse to correctly dry the coils. Re-
move any excess water by blowing air through the
coils with a hand-held blower or vacuum.
Cleaning procedure for environment guard
premium microchannel coils
You must clean environment guard premium micro-
channel coils following this procedure described be-
low at least once every 3 months to ensure that the
integrity of the coils and the warranty of the coils are
maintained. In environments where the coils become
heavily fouled, or where there are high levels of pol-
lution or corrosive elements, a monthly cleaning pro-
cedure using Steps 1, 2, and 7 below is recommended,
in addition to the quarterly cleaning using Steps 1 to
8. Refer to the Johnson Controls Microchannel Heat
Exchanger Application Guide (Form 150-12-AD1) for
further details on the classification of polluted and cor-
rosive environments
Proper care must be taken to ensure that
cleaning agents and water are not sprayed
directly onto electrical components and
wiring in the V-panels and the chiller.
Form 150.72-ICOM6
Issue date: 12/19/2023
coil cleaner, or
TM
Johnson Controls