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Marvair Wall Mount Heat Pump I&O Manual
11/2021 New
Maintenance
6.1 Scheduled Maintenance
Marvair, Inc. strongly recommends that the heat pump 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 heat pump should be operated in the cooling and heating cycles as described in Chapter 3, Start-Up.
In addition to this seasonal check-out, the unit should be maintained as follows:
Air Filter
Replace the air filter whenever it is visibly dirty. Never operate the heat pump without the filters in place.
Indoor Coil
If the coil becomes clogged or dirty, it may be cleaned by careful vacuuming or with a commercial
evaporator cleaning spray. DO NOT use a solvent containing bleach, acetone, or flammable substances.
Turn power OFF before cleaning. Be careful not to wet any of the electrical components. Be sure the
unit has dried before restarting. Use a fin comb of the correct spacing to straighten mashed or bent fins.
Outdoor Coil
Periodically inspect the outdoor coil and the cabinet air reliefs for dirt or obstructions. Remove foreign
objects such as leaves, paper, etc.
If the 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.
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 Marvair
Heat Pump, 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.
