Filters
require cleaning or replacement (depending on the type)
because as they accumulate dirt, they block up, reducing
airflow and hence the cooling capacity of the air
conditioner. In addition some types lose filtration efficiency
as they get dirty.
There are a large number of different types of filter with
different requirements. If you have a proper maintenance
manual for the installation, refer to the manual for cleaning
advice. If you don't have a proper manual, the main types and
their normal cleaning requirements are as follows: (If you are
unsure speak to your contractor or phone Clive Blanchard,
Consulting Mechanical Engineer). In some cases more frequent
cleaning may be required.
Return air grille filters: these filters are generally
in hinged filter frames attached to the return air grille. These
filters are really residential filters, unless they are used in
conjunction with another higher efficiency filter or air
cleaner. These filters are generally of the washable type and
should be cleaned by gently washing with water. If they won't
clean, use a mild detergent. These filters usually require
very frequent cleaning, at least monthly, and often more
frequently.
Deep bed filters: These are large filters usually 400 to
600 mm deep. These may be of the washable or disposable kind.
The life of these varies depending on the design and the amount
of dust they are subject to. In general you should get at least
12 months life, and sometimes up to three years life between
cleanings or replacement. It is generally better to get your air
conditioning service company to service these.
Electronic Air Cleaners: These may be stand alone units
or incorporated into the ductwork. The cores generally require
cleaning approximately once per month.
Other types of air cleaner: There are a number of other
types of cleaner. Refer to the manufacturer's literature for
details of maintenance requirements.