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29733 R2 06/01/2003
16
B: Annual Service By Contractor
THE COMBUSTION CHAMBER (FIREPOT) IS
FRAGILE. USE CARE WHEN INSPECTING AND
CLEANING THIS AREA.
The heat exchanger should be inspected periodically and
cleaned if necessary. if cleaning is necessary, SHUT
OFF POWER TO THE FURNACE and remove the
burner. Using a stiff brush with a wire handle, brush off
scale and soot from inside the drum and flue pipe. To
clean the radiator, remove the round covers on the inner
radiator access pipes located on the front panel between
the oil burner and the flue pipe.
A wire brush can be used to loosen dirt and debris on the
inside surfaces of the radiator. Clean out all accumulated
dirt, soot and debris with a wire handled brush and an
industrial vacuum cleaner. Replace the clean-out covers.
Most circulating fan motors are permanently lubricated by
the motor manufacturer. These motors will have no oil
ports. If the blower motor does contain oil ports, under
normal operating conditions it will not require oiling for the
first two years. Oil sparingly; a few drops in each oil port
with SAE 20 non-detergent oil. Oiling is most easily done
with a "tele-spout" oiler. This oilier has a long flexible
plastic spout. DO NOT OVER-LUBRICATE. Excess oil
may result in premature electric motor failure.
Inspect the blower fan. Clean it if necessary.
Oil Burner Maintenance: Follow the instructions of the oil
burner manufacturer. (See oil burner manufacturer's
instructions supplied with furnace). The oil burner nozzle
should be replaced annually. We recommend that the oil
filter be changed on an annual basis.
The venting system should be cleaned and inspected for
signs of deterioration. Replace pitted or perforated vent
pipe and fittings. The barometric damper should open
and close freely.
All electrical connections should be checked to ensure
tight connections. Safety controls such as the high limit
controls should be tested for functionality. The fan control
functions should be checked to ensure that all fan speeds
are operating properly.
20. FURNACE INSTALLATION SET UP
The furnace must be set up as the final step in the
installation.
A) The oil burner must be set up following the
procedures outlined in section 17: Oil Burner Set Up.
B) The 80F should operate within a temperature rise of
60°F to 90°F, the 120F; 55°F to 85°F. To determine the
temperature rise, measure the supply air and return air
temperatures when the furnace has reached steady state
conditions. This is the point at which the supply air
temperature stops increasing relative to the return air
temperature. The furnace may have to run 10 to 15
minutes to reach steady state conditions. The
measurements may be made with duct thermometers or
thermocouples used in conjunction with multi-meters with
temperature measurement capabilities.
The return air should be measured at a point where the
thermometer will be well within the air stream near the
furnace return air inlet. Actual location is not particularly
critical; however, avoid locations where the temperature
readings could be affected by humidifier bypass ducts,
the inside radius of elbows, etc.
The supply air temperature should be measured at a
point where the thermometer will be well within the air
stream near the furnace supply air outlet. Usually, the
side mid-point of the supply air plenum take-off is ideal,
providing it is out of the line of sight to the heat
exchanger. If the thermometer is within the line of sight of
the heat exchanger, the supply air readings may be
skewed by radiant heat from the heat exchanger. If the
plenum take-off is unsuitable, the supply air temperature
may be measured within the first 18 inches of the first
segment of supply air trunk duct.
If the temperature rise is outside the recommended
range, it may be adjusted on direct drive equipped units
by selecting alternate circulation fan motor speeds, or on
belt drive equipped units, by adjusting the variable speed
motor pulley or by blower pulley changes. If the
temperature rise is too high, speed the fan up. If the
temperature rise is too low, slow the fan down.
C) Keep in mind that the stack temperature varies
directly with the temperature rise. The higher the
temperature rise, the higher the stack temperature will
be, resulting in lower efficiency. The lower the
temperature rise, the lower the stack temperature will be,
which, in some cases, may allow condensation to form in
the chimney and other vent parts.
D) Test the high limit control to ensure that it is
operating correctly. This may be done by temporarily
removing the circulator fan heating wire or neutral wire.
On furnaces equipped with belt drive blowers, the fan belt
may be temporarily removed. Turn of electrical power to
the furnace before working with the motor wires. Be sure
to protect any removed wires from shorting out on metal
furnace parts. If the high limit test is successful, shut off
the electrical power to the furnace, restore the proper