Routine Maintenance
CLCH-SVX009L-EN 67
For MI fan vertical unit, access via the coil door, see Figure 69.
3. Wearing the appropriate personal protective equipment,
use a soft brush to remove loose debris from both sides of
the coil.
4. Install a block-off to prevent spray from going through the
coil and into a dry section of the unit and/or system
ductwork.
5. Mix a high-quality coil cleaning detergent with water
according to the manufacturer’s instructions.
Note: If the detergent is strongly alkaline after mixing (PH 8.5
or higher), it must contain an inhibitor. Follow the
cleaning solution manufacturer’s instructions
regarding the use of the product.
6. Place the mixed solution in a garden pump-up sprayer or
high-pressure sprayer. If a high pressure sprayer is to be
used:
– Maintain minimum nozzle spray angle of 15 degrees.
– Spray perpendicular to the coil face.
– Keep the nozzle at least 6 inches from the coil.
–Do not exceed 600 psi.
7. Spray the leaving air side of the coil first, then the entering
air side.
8. Thoroughly rinse both sides of the coil and the drain pan
with cool, clean water.
9. Repeat steps 6 and 7 as necessary.
10. Straighten any coil fins that may have been damaged
during the cleaning process.
11. Confirm the drain line is open following the cleaning
process.
12. Allow the unit to dry thoroughly before putting it back into
service.
13. Replace all panels and parts and restore electrical power
to the unit.
14. Be careful any contaminated material does not contact
other areas of the unit or building. Properly dispose of all
contaminated materials.
Figure 68. Gain access to both sides of coil shown for sizes 8, 14, 17, 21, 25, and 30
Remove all
panel
fasteners
Access panel
can now be
removed
Figure 69. For vertical MI fan, gain access via the coil
door
Note: Coil access door
removed for clarity
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