
Daikin IM 902 7
Operation and Maintenance
Operation and Maintenance
Operation
General
1Proper air distribution is vital to coil performance. Airflow
anywhere on the coil face should not vary by more than
20%.
2The drain pan and associated piping (drain line and trap)
should be installed so that there is no standing water in the
drain pan and that no blow-through occurs.
3Air velocities should be maintained between 200-550 feet
per minute.
Maintenance
General
1Filters should be inspected on a regular basis and changed
as needed. Maintaining clean filters is a cost effective way
to help maintain maximum coil performance and service
life.
2Periodic inspection of the coil for signs of corrosion and/or
leaks is recommended. Repair and replacement of the coil
and the connecting piping, valves, etc., should be
performed as needed by a qualified individual(s).
3Should the coil surface need cleaning, caution should be
exercised in selecting the cleaning solution as well as the
cleaning equipment. Improper selection can result in
damage to the coil and/or health hazards.
4Suggested cleaning instructions:
aWhen handling strong chemicals, be sure to wear
chemical impervious gloves, apron, and splash goggles.
bActi-Brite (AB-1) is the recommended cleaning
solution. Contact your local Daikin Parts Distributor.
cDetermine required dilution for the specific application.
It is recommended to start with a dilution ratio of 10:1
and increase concentration until the desired results are
achieved.
dAs with mixing all acids, place the desired amount of
water into the tank and then add the chemicals.
eTurn off fans and allow hot coils to cool before
applying.
fUsing plain water, wet both the coil as well as the area
surrounding the equipment. Wetting the coil with water
aids in product penetration and performance.
gApply properly diluted product to coil surface.
Whenever possible, apply solution from the outlet side
of the coil. Allow solution to remain on surface,
normally 5-10 minutes. Do not allow solution to dry on
the coil.
Note: In extreme cases, application may have to be
repeated to achieve desired results.
hIf foaming does not occur, check for extreme grease
buildup which will slow cleaning process. Foaming may
not occur if coil is coated or painted.
iRinse coils, tools, and surrounding area thoroughly after
the coil cleaning.
5Clean the coil from the leaving airside so that foreign
material will be washed out of the coil rather than pushed
further in.
6Periodic inspection of the coil for signs of corrosion and for
leaks is recommended. Small leaks can be detected using a
Halide torch. Repair and replacement of the coil and the
connecting piping, valves, etc., should be performed as
needed by a qualified individual.
7The use of filter-dryers in the system piping is
recommended along with a sight glass that has a moisture
indicator. Replace the filter dryer(s) as needed.
Note: Refrigerant conversions are beyond the scope of this
manual and should only be performed by qualified
parties.
DANGER
Follow the manufacturer’s guidelines for lockout/tagout and
disconnect all power to the unit before performing maintenance.
Contact with high voltage power will cause electrical shock,
resulting in severe personal injury or death.
WARNING
Moving parts, high pressure, and/or high temperature fluids can
cause serious personal injury.
CAUTION
Carefully read and follow the manufacturer's recommendations
before using any cleaning fluid.