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Routine Maintenance
52 CAH-SVX01A-EN
See “
ƽ
WARNING Hazardous
Voltage with Capacitors!” on
page 49 regarding
disconnection of power.
Coils
All coils should be kept clean to
maintain maximum performance.
Steam and Water Coils
To clean steam and water coils:
1 Disconnect all electrical power to
the unit.
2 Wearing the appropriate
personal protective equipment,
use a soft brush to remove loose
debris from both sides of the
coil.
3 Insert a block-off to prevent
steam from blowing through the
coil and into a dry section of the
unit.
4 Use a steam cleaning machine to
clean the coil, cleaning the
leaving air side of the coil first,
then the entering air side. Repeat
as necessary.
Note: Start from the top of the coil
and work downward.
5 Straighten any coil fins that may
have been damaged during the
cleaning process.
6 Confirm the drain line is open
following the cleaning process.
7 Allow the unit to dry thoroughly
before putting it back into
service.
8 Replace all panels and parts and
restore electrical power to the
unit.
9 Be careful any contaminated
material does not contact other
areas of the unit or building.
Properly dispose of all
contaminated materials.
Type K Cooling Coils
Type K cooling coils have removable
headers for cleaning:
1 Remove the headers.
2 Use a small nylon or fiber brush
to clean the tubes.
3 Flush the tubes with water.
4 Install a new rubber sealing
gasket and be sure it seats
properly when the header is
replaced.
Note: Apply washers under the bolt
heads. Bolts should be evenly
tightened to 50 foot-pounds of
torque, beginning in the center and
working toward the outside.
Refrigerant Coils
ƽ WARNING
Hazardous Chemicals!
Coil cleaning agents can be either
acidic or highly alkaline. Handle
chemical carefully. Proper handling
should include goggles or face
shield, chemical resistant gloves,
boots, apron or suit as required. For
personal safety refer to the cleaning
agent manufacturer’s Materials
Safety Data Sheet and follow all
recommended safe handling
practices. Failure to follow all safety
instructions could result in death or
serious injury.
ƽ 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.
To clean refrigerant coils:
1 Disconnect all electrical power to
the unit.
2 Wearing the appropriate
personal protective equipment,
use a soft brush to remove loose
debris from both sides of the
coil.
3 Install a block-off to prevent
spray from going through the
coil and into a dry section of the
unit and/or system ductwork.
4 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.
5 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.
6 Spray the leaving air side of the
coil first, then the entering air
side.
7 Thoroughly rinse both sides of
the coil and the drain pan with
cool, clean water.
8 Repeat steps 6 and 7 as
necessary.
9 Straighten any coil fins damaged
during the cleaning process.
10 Confirm the drain line is open
following the cleaning process.