Routine Maintenance
56
CLCH-SVX009A-EN
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.
Refrigerant Coils
Figure 48.
Gain access to both sides of coil shown for sizes 8, 14, 17, 21, 25, and 30
Remo
ve all
panel
fasteners
Access panel
can now be
remo
ved
WARNING
Hazardous Pressures!
Coils contain refrigerant under pressure. When cleaning
coils, maintain coil cleaning solution temperature
under 150°F to avoid excessive pressure in the coil.
Failure to follow these safety precautions could result in
coil bursting, which could result in death or serious
injury.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
