Service and Maintenance
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IM 915-13 • VISION - EXTENDED SIZES
Maintaining the Coil
CAUTION
Sharp fin edges are a potential injury hazard. Avoid contact
with them.
1. To obtain maximum performance, the coil must be clean.
Check once a year under normal operating conditions
and, if dirty, brush or vacuum clean. Use a chemical
coil cleaner on multiple row coils. Read and follow the
chemical cleaner’s instructions as some cleaners may
contain harsh chemicals. Take care not to damage fins
while cleaning.
2. Drain pans in any air conditioning unit may have some
moisture. Algae, etc., can grow due to airborne spores
and bacteria. Periodic cleaning is necessary to prevent
this buildup from plugging the drain and causing the
drain pan to overflow. Also, keep the drain pans clean
to prevent the spread of disease. Cleaning should be
performed by qualified personnel.
3. Dirt and lint can clog the condensate drain, especially
with dirty filters. Inspect twice a year to help avoid
overflow.
Winterizing Water Coils
WARNING
Mold can cause personal injury. Clean drain pan regularly so
mold does not develop.
Coils can freeze due to air stratification or failure of outdoor air
dampers and/or preheat controls. Drain all coils as thoroughly
as possible and then perform the following:
• Fill each coil independently with an antifreeze solution
using a small circulating pump and again thoroughly
drain.
• Check freezing point of antifreeze before proceeding
to next coil. Due to a small amount of water always
remaining in each coil, there is a diluting effect. The small
amount of antifreeze solution remaining in the coil must
always be sufficient enough to event freeze-up.
NOTE:
Carefully read instructions for mixing antifreeze
solution used. Some products have a higher freezing
point in their natural state when mixed with water.
Daikin Applied is not responsible for the freezing of
coils.
Removing and Replacing Components
WARNING
Before removing any component, lock out and tag out all
power to the unit. Fans and belts can cause severe personal
injury or death.
Removing a Panel
To Remove a Side or Top Panel:
1.
Remove the flat head fasteners located along the sides
of the panel.
2.
Once all fasteners are removed, lift off the panel.
Removing a Frame Channel
Frame channels that run the length of the unit along the top
can be removed to allow access to both the side and top of the
unit.
To Remove the Frame Channel:
1. First remove any adjoining side and top panel(s).
2.
Once the side panel is off, remove the flat head fasteners
in the corner of the frame channels.
3. Pull the frame channel out the side.
If any top panel fastens into the frame channel (when the frame
channel is 24” or wider in direction of air flow), remove the
fasteners in the top panel before pulling out the channel.
Removing the Fan Section
The fan shaft, motor, and any drive components can be
removed and replaced through the access door opening. If
required, the side panel can be removed for additional access.
If fan replacement is required, the entire fan assembly can be
pulled out the side of the cabinet for housed fan assemblies.
The fan assembly includes the fan housing, the bearing
support, and the fan base.
For plenum fan assemblies, the entire fan cabinet may need to
be removed to replace the entire fan assembly depending on the
length of the fan section. In some cases, the fan section is not
long enough for the assembly to fit out the side of the cabinet.
For those cases where it will fit, follow the above steps except
the neoprene seal is a D-gasket on the inlet side that needs to
be removed for plenum fans. Otherwise, the entire fan cabinet
must be removed from the other sections and then the fan
assembly can be removed out the discharge side of the cabinet.
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