Daikin
IM 902
7
Operation and Maintenance
Operation and Maintenance
Operation
General
1
Proper air distribution is vital to coil performance. Airflow
anywhere on the coil face should not vary by more than
20%.
2
The 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.
3
Air velocities should be maintained between 200-550 feet
per minute.
Maintenance
General
1
Filters 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.
2
Periodic 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).
3
Should 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.
4
Suggested cleaning instructions:
a
When handling strong chemicals, be sure to wear
chemical impervious gloves, apron, and splash goggles.
b
Acti-Brite (AB-1) is the recommended cleaning
solution. Contact your local
Daikin
Parts Distributor.
c
Determine 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.
d
As with mixing all acids, place the desired amount of
water into the tank and then add the chemicals.
e
Turn off fans and allow hot coils to cool before
applying.
f
Using 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.
g
Apply 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.
h
If foaming does not occur, check for extreme grease
buildup which will slow cleaning process. Foaming may
not occur if coil is coated or painted.
i
Rinse coils, tools, and surrounding area thoroughly after
the coil cleaning.
5
Clean the coil from the leaving airside so that foreign
material will be washed out of the coil rather than pushed
further in.
6
Periodic 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.
7
The 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.
