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4
JOHNSON CONTROLS
5276178-JIM-C-0118
Supply and Exhaust Fan Motor
On an annual basis, check the motor for accumulations
of dust, etc. That may block the cooling slots in the
motor shell. Check for loose, damaged or misaligned
drive components. Check that all mounting bolts are
tight. Replace defective parts as required.
Outdoor Coil
Dirt should not be allowed to accumulate on the outdoor
coil surface or other parts in the air circuit. Cleaning
should be as often as necessary to keep coil clean. Use
a brush, vacuum cleaner attachment, or other suitable
means. If water is used to clean coil, be sure power to
the unit is shut off prior to cleaning
Exercise care when cleaning the coil
so that the coil fins are not damaged.
Do not permit the hot condenser air discharge to be
obstructed by overhanging structures or shrubs.
Gas Burner
Periodically (at least annually at the beginning of each
heating season) make a visual check of the main burner
flame. If necessary, adjust main burner primary air
shutters to give a distinct, sharp blue flame as explained
under
“
Burner Instructions”.
To Clean Burners
Remove them from the furnace as explained in “Burner
Instructions”. Clean burners with hot water applied
along top of the burner.
Combustion Air Discharge
Visually inspect discharge outlet periodically to make
sure that the buildup of soot and dirt is not excessive.
If necessary, clean to maintain adequate combustion
air discharge.
Cleaning Flue Passages and Heating
Elements
With proper combustion adjustment, the heating element
of a gas fired furnace will seldom need cleaning. If the
element should become sooted, it can be cleaned as
follows:
1. Remove the burner assembly as outlined in “Burner
Instructions”.
2. Remove the screws holding the top of the flue
collector box. Carefully remove the top of the flue
collector box. The draft wheel, housing, and draft
motor can remain assembled to the flue box top,
if cleaning of these components is not required.
3. This will provide access to flue baffles, then remove
the flue baffles from the tube interiors. To remove,
the flue baffles, remove the stainless steel screws
from the vest panel.
Refer to Figure 52.
4. Using a wire brush on a flexible wand, brush out
the inside of each heat exchanger from the burner
inlet and flue outlet ends.
5. Brush out the inside of the flue collector box, and
the flue baffles.
6. Run the wire brush down the vent hoods from the
flue collector end.
7. If soot build-up is particularly bad, remove the vent
motor and clean the wheels and housings. Run the
wire brush down the flue extension at the outlet of
the vent housings.
8. After brushing is complete, blow all brushed areas
with air or nitrogen. Vacuum as needed.
9. Replace parts in the order they were moved in steps
1 to 4.
10. Assure that all seams on the vent side of the
combustion systems are air tight. Apply a high
temperature (+500°F) sealing compound where
needed (Dow Corning, Silastic).
One end of each flue baffle is provided
with a sharper bend than the other end.
This sharper bend must be positioned
at the tube and attached with a stain
-
less steel screw.
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