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www.DaikinApplied.com 87
IOM 1242-2 • PATHFINDER
®
MODEL AWV CHILLERS
Cleaning Microchannel Aluminum Coils
Maintenance consists primarily of the routine removal of dirt
and debris from the outside surface of the fins.
WARNING
Prior to cleaning the unit, turn off and lock out the main power
switch to the unit and close all access panels.
Remove Surface Loaded Fibers
Surface loaded fibers or dirt should be removed prior to water
rinse to prevent further restriction of airflow. If unable to back
wash the side of the coil opposite that of the coils entering air
side, then surface loaded fibers or dirt should be removed with
a vacuum cleaner. If a vacuum cleaner is not available, a soft
non-metallic bristle brush may be used. In either case, the tool
should be applied in the direction of the fins.
NOTE:
Use of a water stream, such as a garden hose,
against a surface loaded coil will drive the fibers and
dirt into the coil. This will make cleaning efforts more
difficult. Surface loaded fibers must be completely
removed prior to using low velocity clean water rinse.
Periodic Clean Water Rinse
A monthly clean water rinse is recommended for coils that are
applied in coastal or industrial environments to help to remove
chlorides, dirt and debris. An elevated water temperature (not
to exceed 130ºF) will reduce surface tension, increasing the
ability to remove chlorides and dirt. Pressure washer pressure
must not exceed 600 psig and the nozzle should remain at
least one foot from the coil to avoid damaging fin edges.
High Velocity Water or Compressed Air
High velocity water from a pressure washer or compressed air
should only be used at a very low pressure to prevent fin and/
or coil damages. The force of the water or air jet may bend the
fin edges and increase airside pressure drop. Reduced unit
performance or nuisance unit shutdowns may occur.
No maintenance is ordinarily required except the routine
removal of dirt and debris from the outside surface of the
fins. Daikin recommends the use of non-caustic, non-acidic
cleaners available at most air conditioning supply outlets. Flush
the coil from the inside out.
Cleaning Epoxy Coated Coils
The following additional cleaning procedures are
recommended as part of the routine maintenance activities
for epoxy coated coils. Documented routine cleaning of epoxy
coated coils is required to maintain warranty coverage.
Routine Quarterly Cleaning of Epoxy Coil
Quarterly cleaning is essential to extend the life of an epoxy
coated coil and is required to maintain warranty coverage.
Coil cleaning shall be part of the unit’s regularly scheduled
maintenance procedures. Failure to clean an epoxy coated coil
will void the warranty and may result in reduced efficiency and
durability in the environment.
For routine quarterly cleaning, first remove surface debris and
then clean the coil with an approved coil cleaner (see approved
products list in
Table 55
). After cleaning the coils with the
approved cleaning agent, use the approved chloride remover
to remove soluble salts and revitalize the unit.
Recommended Coil Cleaner
The following cleaning agents, assuming they are used in
accordance with the manufacturer’s directions on the container
for proper mixing and cleaning, have been approved for use on
epoxy coated coils to remove mold, mildew, dust, soot, greasy
residue, lint and other particulate:
Table 55: Epoxy Coil Recommended Cleaning Agents
Cleaning Agent Reseller
Part Number
Enviro-Coil
Concentrate
Hydro-Balance Corp
P.O. Box 730
Prosper, TX 75078
800-527-5166
H-EC01
Enviro-Coil
Concentrate
Home Depot
H-EC01
Chloride
Remover
Chlor*Rid Int’l, Inc.
P.O. Box 908
Chandler, AZ 85244
800-422-3217
Chlor*Rid DTS
CHLOR*RID DTS™ should be used to remove soluble salts
from the epoxy coated coil, but the directions must be followed
closely. This product is not intended for use as a degreaser.
Any grease or oil film should first be removed with the
approved cleaning agent.
1. Remove Barrier - Soluble salts adhere themselves
to the substrate. For the effective use of this product,
the product must be able to come in contact with the
salts. These salts may be beneath any soils, grease or
dirt; therefore, these barriers must be removed prior to
application of this product. As in all surface preparation,
the best work yields the best results.
2.
Apply CHLOR*RID DTS - Apply CHLOR*RID DTS
directly onto the substrate. Sufficient product must be
applied uniformly across the substrate to thoroughly
wet out surface with no areas missed. This may
be accomplished by use of a pump-up sprayer or
conventional spray gun. The method does not matter, as
long as the entire area to be cleaned is wetted. After the
substrate has been thoroughly wetted, the salts will be
soluble and is now only necessary to rinse them off.
3. Rinse - It is highly recommended that a hose be used
as a pressure washer will damage the fins. The water
used for the rinse is recommended to be of potable
quality, though a lesser quality of water may be used if a
small amount of CHLOR*RID DTS is added. Check with
CHLOR*RID International, Inc. for recommendations on
lesser quality rinse water.
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