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882108-YIM-B-1012
84 Johnson Controls Unitary Products
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.
If desired, every three years remove both pipe plugs at each
end shell and clean out any hardened grease or foreign mat-
ter. Replace one plug on each end with a clean grease fitting.
Using a low pressure grease gun, pump grease (Chevron
SRI-2 or equivalent) into the bearing cavity until new grease
shows at the open port. Do not over-lubricate. Run the motor
for ten minutes until excess grease is purged from the cavity.
Replace the plugs.
FAN DRIVES
Units are supplied with fan shaft bearings that do not require
maintenance but may be relubricated per Table 59.
Lubricate with a premium quality NLGI 2 grade multi-purpose
roller bearing grease having corrosion inhibitors, anti-oxidant
additives and mechanical stability for high speed operation.
The grease should also have a minimum base oil viscosity of
500 SUS at 100°F. Do not use a heavy, long fibered grease.
The presents of dirt, moisture or chemical fumes around the
bearings requires more frequent lubrication.
Fill bearings with lubricant prior to extended shutdown or stor-
age. Rotate the shaft monthly during idle periods.
Avoid excessive grease purging from seals during lubrication,
this reduces the life of the bearing.
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.
NOTE: 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 heat-
ing season) make a visual check of the main burner flame.
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 com-
ponents 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 48.
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 hous-
ings.
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.
TABLE 59: INDOOR BLOWER BEARING
LUBRICATION SCHEDULE
Shaft Size (Inches)
Operating Speed (RPM)
500 1000 1500 2000
Relubrication Cycle (Months)
1-1/16 - 1-7/16 6666
1-1/2 - 1-3/4 6664
1-7/8 - 2-3/16 6644
2 -1/4 - 3 6442