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Marvair MAA/MGA Wall Mount AC Installation & Operation Manual
05/2023 Rev.21
Chapter 6 Maintenance
6.1 Scheduled Maintenance
Marvair strongly recommends that the air conditioner be serviced a minimum of twice a year – once
prior to the heating season and once prior to the cooling season. At this time the filters, evaporator coil,
condenser coil, the cabinet, and condensate drains should be serviced as described below. Also at this
time, the air conditioner should be operated in the cooling and heating cycles as described in Chapter
3, Start-Up. In addition to this seasonal check-out, the AC unit should be maintained as follows:
Air Filter
Replace the air filter whenever it is visibly dirty. Never operate the unit without the filter in place.
Evaporator
If the evaporator becomes clogged or dirty, it may be cleaned by careful vacuuming or with a com-
mercial evaporator cleaning spray. DO NOT use a solvent containing bleach, acetone, or flammable
substances. Turn off power before cleaning. Be careful not to wet any of the electrical components. Be
sure the unit has dried before restarting.
Condenser
Periodically inspect the outdoor condenser coil and the cabinet air reliefs for dirt or obstructions. Remove
foreign objects such as leaves, paper, etc.
If the condenser coil is dirty, it may be washed off with a commercial solvent intended for this purpose.
TURN OFF POWER BEFORE CLEANING! Be sure that all electrical components are thoroughly
dry before restoring power. Use a fin comb of the correct spacing to straighten mashed or bent fins.
Cabinet
The cabinet may be cleaned with a sponge and warm, soapy water or a mild detergent. Do not use
bleach, abrasive chemicals or harmful solvents.
Drains
Regularly check the primary and secondary condensate drains. The secondary drain has a stand pipe.
An obstruction will force water to dump into the middle of the unit and drain out the sides of the unit,
causing discoloration of the side panels. If discoloration is noted, service the drains.
If a commercial drain solvent is used, flush out the drain pan and system with plenty of fresh water to
prevent corrosion.
Lubrication
Oiling of the condenser fan motor or the evaporator blower motor is not recommended.
DANGER
Sever hazard. The economizer contains moving parts capable of causing serious
injury or death. Disconnect power before removing the covering panel.
