Routine Equipment Outdoor Maintenance; Basic Operating Principles; Air Conditioners - Bard MULTI-TEC W18AAPA Service Instructions Manual

Depending on the specific equipment involved, the surface that can accumulate debris can be on the
opposite side that is exposed to view when standing in front of the machine. Closely review the machine
when operating to see which direction or path that the airflow moves through the machine, and if the air
inlet side of the coil is hidden, try to observe the back (hidden) side by looking into the side grilles, using
flashlight if necessary.
While the user of the equipment needs to be aware of the potential of clogging of the outdoor coil
surface, actual cleaning of the outdoor coil should not be attempted under most circumstances. If the
user should attempt this procedure on their own, never do so without first having the installing dealer or
Service Company instruct you in the proper procedure and technique.
WARNING: Do not open or enter the equipment without first turning off the electrical service
disconnect. Failure to do so can result in personal injury due to moving parts and/or electric
shock hazard resulting in death.
Other conditions that can cause reduction of airflow across the outdoor coil are flowers, shrubbery or
other growth too near the outdoor coil air inlet and outlet openings. These living things, especially as
they mature and grow, will be just as effective in blocking the airflow and create the same problems as
will stacking things against the equipment. These conditions can be easily managed and controlled by
the user, as they do not require actually entering into the equipment enclosure, which should only be
done by qualified service technicians.
See section on Air-to-Air Heat Pumps for additional information concerning blockage due to heavy snow
conditions, if applicable.

ROUTINE EQUIPMENT OUTDOOR MAINTENANCE

1. Avoid having any lawn sprinkler spray directly on the equipment, especially if from a brackish
water source.
2. In coastal areas locate equipment the furthest distance away from the coastline as feasible.
3. Frequent cleaning and waxing of the cabinet using a good automobile polish will help extend its
original appearance.

AIR CONDITIONERS

COOLING MODE
The cooling mode operates similar to a refrigerator, removing heat from inside the conditioned space
and rejects it outside of the space being controlled. There are three main parts of the system:
1. The evaporator (indoor) coil where cold refrigerant absorbs heat from the air, which circulates
from the conditioned space, through the machine, and is returned to the space at a lower
temperature and with some of the humidity (moisture) removed. The moisture exits through a
condensate drain system. A motor/blower assembly moves the indoor air through the system.
2. The compressor, which is a sealed pump that moves the refrigerant through the system.
3. The condenser (outdoor) coil where the heat that was absorbed from the indoor space is
discharged to the outdoor environment. A motor/fan system moves the outdoor air across the
condenser coil.
A properly sized air conditioner cannot cool a structure off rapidly, and instead will pull down the
temperature slowly. It also will remove a certain amount of moisture (humidity) from the circulating air

BASIC OPERATING PRINCIPLES

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