s
ervICe
and
M
aInTenanCe
www.DaikinApplied.com 69
IM 777-18 • SKYLINE OUTDOOR AIR HANDLER
Coils
1. The coil must be clean to obtain maximum performance.
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. Do not depend on routine
draining of water cooling coils for winter shutdown as insurance
against freeze-up. Severe coil damage can result. Drain all
coils as thoroughly as possible and then treat in the following
manner.
• 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 concentrated enough to prevent 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 is not responsible for the freezing of coils.
Removing and Replacing
Components
WARNING
Before removing component, lock out and tag out all
power to the unit .
Fans and belts can cause severe personal
injury or death.
See Panels, Frame Channels, and Doors on page 9
for
instructions on removing panels and opening fan access doors
to remove or replace components.
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.
Removing the Fan Assembly
1. Remove the side panels and any intermediate supports
(follow instructions for side panel removal).
2. Once the panels and any intermediate supports are
removed, disconnect the neoprene bulk head seal that is
attached to the fan discharge.
3. Remove the four discharge angles that hold the
neoprene canvas in place around the discharge opening.
4. Disconnect the fan sled from each of the corner mounts
and pull the entire assembly out the side of the unit.
5. After the fan sled is out, loosen the fan bearings and pull
out the shaft.
6. Disconnect the fan housing from the fan sled, and
bearing support by removing the attaching bolts.
7. Replace the new fan, reconnect the shaft and bearings
and put the fan assembly in the cabinet.
8. Replace panels and fasteners.
