Service and Parts Manual (2016, 2017, 2018, 2019, 2020, 2021, 2022)

28 PB
Coils & Chassis
NOTE: Do not use a caustic cleaning agent on coils or base pan. Use a biodegradable cleaning agent and degreaser.
The use of harsh cleaning materials may lead to deterioration of the aluminum ns 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 n pack.
Use a sweeping up and down motion in the direction of the vertical aluminum n 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.
NOTE: When installed on or near sea coast environments, it recommended that all coils be cleaned at minimum
biannually.
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 lter should be inspected weekly and cleaned if needed by vacuuming with a dust attachment or by cleaning
in the sink using warm water and a mild dishwashing detergent. Dry the lter 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.
Inspect for mold or mildew periodically. If present, ensure the sealing gasket around the unit is in good condition
and not allowing outside air (or light) through the gasket.
Blower Wheel / Housing / Condensor 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 degreaser 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 lter should be cleaned at least monthly, and more frequently if conditions
warrant. The unit must be turned off before the lter is cleaned.
Routine Maintenance