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MAINTENANCE
Air Filter(s)
c CAUTION: To avoid injury from moving parts, hot surfaces, or electrical
shock, shut off the power to the furnace and allow the furnace to cool BEFORE
removing any furnace access doors to service air filters.
Highboy and lowboy furnace models are factory-supplied with a permanent-type, air
filter. At least twice a year, remove the air filter(s) for cleaning. Clean a filter by soaking
it in water with a mild detergent and then rinsing it with clean water. Allow the filter to air
dry before reinstalling it in the furnace filter rack.
If the furnace, or duct system, is equipped with disposable-type (paper element), air
filters, inspect them every month for an excessive accumulation of dust and dirt.
Replace disposable air filters at least twice a year. Make certain the replacement filter is
the same size as the one being replaced. The filter size is marked on the outer edge of
the air filter. Install the filter with the arrow marked on the filter pointing toward the
furnace.
Oil Burner
NOTICE: A qualified heating contractor MUST service the oil burner in this
furnace at least once a year.
Generally, service to the burner will involve a thorough inspection and cleaning of the
burner, replacement of the oil nozzle and oil filter, and readjustment of the burner to
achieve proper ignition and clean combustion.
Blower and Motor
NOTICE: The fan motor has sealed bearings that do NOT require lubrication.
The blower and fan motor will not normally require any service. This furnace is
equipped with a directly-driven blower. Therefore, it will not require any retensioning or
replacement of a drive belt.
Heat Exchanger
c CAUTION: DO NOT attempt to clean the heat exchanger unless electrical power
and fuel flow to the furnace are turned off and the furnace is at room temperature.
c CAUTION: The combustion chamber refractory material is fragile and can be
easily damaged. If the inner radiator of the heat exchanger is cleaned, avoid
scraping or hitting the walls of the combustion chamber.
CAUTION: Do not brush or scrape the surface of the combustion chamber. It can be
easily damaged.