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66441-YUM-D-1011
6 Johnson Controls Unitary Products
ECONOMIZER
Even with good filters properly in place, the economizer
assembly will become dust laden after many months of use.
The entire assembly should be inspected annually. If the
assembly is heavily coated with dust, it can be brushed and
cleaned with a vacuum. A common aerosol contact cleaner
will help remove excess accumulation.
After the dust and debris is removed, a silicon based spray
lubricant should be applied to each of the gears used to con-
nect and ensure proper alignment of the damper blades.
BLOWER ASSEMBLY
Even with good filters properly in place, blower wheels and
motors will become dust laden after many months of opera-
tion. The entire blower assembly should be inspected annu-
ally. If the motor and wheel are heavily coated with dust, they
can be brushed and cleaned with a vacuum cleaner.
BLOWER SHAFT BEARING
Blower shaft bearings should be inspected on a monthly
basis. At a minimum, the bearings should be relubricated
every 6 months using a lithium-based grease (NLGI grade 2)
recommended for ball bearing service.
MOTORS
Outdoor fan motors are permanently lubricated and require
no maintenance.
Ventor motor is factory lubricated for an estimated 10 year
life.
Indoor Blower Motor and Drive - The indoor blower motor fea-
tures ball bearings that do not require periodic lubrication.
Periodic lubrication of the motor and bearings can extend the
life of components but is optional.
If desired, every three years, using a low pressure grease
gun, pump grease into the bearing grease fitting until grease
just begins to show at the seals. Do not over lubricate. Use
any lithium base grease recommended for ball bearing ser-
vice.
FIGURE 5 - END VIEW LESS FILTER ACCESS
PANEL
Perform all maintenance operations on the
damper assembly with power disconnected. Do
not clean or lubricate with the unit in operation.
15, 17.5, 20, 25 TON ULTRA-HIGH EFFICIENCY UNITS
25 TON STANDARD EFFICIENCY
15 TON
(2) 18" X 24"
FILTERS
20 TON
15,20,25 TON REHEAT
20 TON
15,20,25 TON REHEAT
(4) 16" X 20"
FILTERS
(4) 16" X 25"
FILTERS
(3) 18" X 24"
FILTERS
15 TON
(6) 12" X 24"
FILTERS
(6) 12" X 24"
FILTERS
15, 20, 25 TON REHEAT UNITS
15 & 20 TON STANDARD & HIGH EFFICIENCY UNITS
INDOOR COIL
CONDENSATE
DRAIN
CONNECTION
CONDENSATE
DRAIN
CONNECTION
INDOOR COIL
Excessive lubrication may accelerate the accu-
mulation of dust.
Perform all maintenance operations on the blower
motor with electric power disconnected from the
unit. Do not attempt to lubricate bearings with the
unit in operation.
Damage can occur if the bearings are overlubri-
cated. Use grease sparingly.