Friedrich Kuhl KCS12B10A Service Manual page 44

Coils & Chassis
NOTE: Do not use a caustic (alkaline) or acidic cleaning agent on coils or base pan. Use a biodegradable cleaning agent and de
greaser. The use of harsh cleaning materials may lead to deterioration of the aluminum fins or the coil end plates.
The indoor coil and outdoor coils and base pan should be inspected periodically (annually or semi-annually) and cleaned of all
debris (lint, dirt, leaves, paper, etc.) as necessary. Under extreme conditions, more frequent cleaning may be required. Clean the
coils with and base pan with a coil comb or soft brush and compressed air or vacuum. A low pressure washer device may also be
used; however, you must be careful not to bend the aluminum fin pack. Use a sweeping up and down motion in the direction of the
vertical aluminum fin pack when pressure cleaning coils.
NOTE: It is extremely important to insure that none of the electrical and/ or electronic parts of the unit get wet when cleaning.
Be sure to cover all electrical components to protect them from water or spray.
Decorative Front
Use a damp (not wet) cloth when cleaning the control area to prevent water from entering the unit, and possibly damaging the
electronic control.
The decorative front and the cabinet can be cleaned with warm water and a mild liquid detergent. Do NOT use solvents or
hydrocarbon based cleaners such as acetone, naphtha, gasoline, benzene, etc.
The indoor coil can be vacuumed with a dusting attachment if it appears to be dirty. DO NOT BEND FINS. The outdoor coil can be
gently sprayed with a garden hose.
The air filter should be inspected periodically and cleaned if needed by vacuuming with a dust attachment or by cleaning in the
sink using warm water and a mild dish washing detergent. Dry the filter thoroughly before reinstalling. Use caution, the coil
surface can be sharp.
Fan Motor & Compressor
The fan motor & compressor are permanently lubricated and require no additional lubrication.
Wall Sleeve
Inspect the inside of the wall sleeve and drain system periodically (annually or semi-annually) and clean as required. Under
extreme conditions, more frequent cleaning may be necessary. Clean both of these areas with an antibacterial and antifungal
cleaner. Rinse both items thoroughly with water and ensure that the drain outlets are operating correctly. Check the sealant
around the sleeve and reseal areas as needed.
Blower Wheel / Housing / Condenser Fan / Shroud
Inspect the indoor blower and its housing, evaporator blade, condenser fan blade and condenser shroud periodically (yearly or bi-
yearly) and clean of all debris (lint, dirt, mold, fungus, etc.). Clean the blower housing area and blower wheel with an antibacterial
/ antifungal cleaner. Use a biodegradable cleaning agent and de greaser on condenser fan and condenser shroud. Use warm or
cold water when rinsing these items. Allow all items to dry thoroughly before reinstalling them.
Electrical / Electronic
Periodically (at least yearly or bi-yearly) inspect all control components: electronic, electrical and mechanical, as well as the
power supply. Use proper testing instruments (voltmeter, ohmmeter, ammeter, wattmeter, etc.) to perform electrical tests. Use
an air conditioning or refrigeration thermometer to check room, outdoor and coil operating temperatures.
Air Filter
To ensure proper unit operation, the air filter should be cleaned at least monthly, and more frequently if conditions warrant. The unit
must be turned off before the filter is cleaned.
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ROUTINE MAINTENANCE