JOHNSON CONTROLS
34
FORM 130.13-NOM8 (1021)
Coil
The frequency of required cleaning is dependent on the
operating hours of the system, filter maintenance and
efficiency as well as dirt load.
Important: Coils may become ex
-
ternally fouled as result of normal
operation. Dirt on the surface of the
coil reduces its ability to transfer heat
that can result in reduced performance
and increased operating energy cost.
If the dirt on the surface of the coil
becomes wet, microbial growth can re
-
sult, possibly causing unpleasant odors
and serious health related indoor air
quality problems.
Fin edges are sharp. Fins are fragile;
care must be exercised to avoid dam
-
aging fins. Do not use solutions to
clean coils; drip pans are not present
to remove collected solution.
Coil Cleaning
1. Disconnect all electrical power to the equipment,
lock out and lock out power source.
2. Put on appropriate personal protective equipment.
3. Gain access to coil either through ductwork or coil
access panel (HW coil only).
4. Use soft brush and vacuum to remove loose debris
from sides of coil.
5. Straighten any coil fins that may have been dam
-
aged during cleaning process with fin comb.
6. Replace ductwork and/or access panel and restore
electrical power to equipment.
7. Use caution to assure that any contaminated mate
-
rial does not contact other areas of the equipment
or building.
Properly dispose of all contaminat-
ed materials.
Step 3:
Locate and remove all hardware securing the
fan assembly to the unit chassis. Carefully remove the
fan assembly from its installed position, loosen fan
wheel set screw.
Step 4:
Locate and remove the bolts securing the motor
to the fan housing. Remove motor/belly band, perform
motor/blower maintenance as required. To reassemble
and reinstall motor/blower assembly, follow steps 1-4 in
reverse fashion.
Step 2:
With quarter-turn latches in the unlocked po-
sition, remove access panels from unit, and place in a
secure location. Disconnect fan motor wiring.
