24
Marvair ComPac AVHDA I&O Manual 03/2019 Rev.3
Chapter 5 Maintenance
The middle front panel provides access to the electrical/control box and to the filters. This panel has hinges
on the left and right hand side. This panel should ONLY be opened by using the two hinges on the left
side
OR
the two hinges on the right side.
NEVER OPEN ALL FOUR HINGES SIMULTANEOUSLY
.
If all four hinges are opened simultaneously, the front panel will drop and may cause serious injury
and damage the panel.
DANGER
NEVER open all four hinges simultaneously. The panel should ONLY be opened by using
the two hinges on the left side OR the two hinges on the right side.
5.1 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 air conditioner 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. De-
pending upon the configuration of your unit, access to the filter can be either from the outside through
the hinged door or from the return grille on the inside of the building.
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
The condensate is drained from the condensate pan through two drains – one on the left side of the
pan and the other on the right side. The condensate lines drain to the outside at the bottom of the unit
through the base pan. Each of the drain lines is looped to form a trap.
Regularly check each drain line to make sure it is not obstructed. If a commercial drain solvent is used,
flush out the drain pan and system with sufficient water to remove the solvent. Some solvents can cause
the drain pan to corrode.
Lubrication
The condenser fan motor(s) and the evaporator blower motor(s) never require oiling.
