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Installation and Maintenance 63
secured to physically restrict rota-
tional movement. Failure to secure
impeller can cause severe per-
sonal injury or death.
1 Disconnect main power switch.
2 Check grease lines for tight connections at the
grease fitting.
3 Using a manual low pressure grease gun, add
grease until a light bead of grease appears at the
bearing grease seal. Turn the fan wheel manually
while adding grease.
Fan Motors
Inspect fan motors periodically for excessive
vibration or temperature. Operating conditions will
vary the frequency of inspection and lubrication.
Table 51
lists recommended motor greasing
intervals. Motor lubrication instructions are found on
the motor tag or nameplate. For a list of compatible
greases, see
Table 49
.
To relubricate the motor, consult the maintenance tag
provided by the vendor.
Refer to
Table 48
for minimum torque of motor
mounting and bearings bolts.
WARNING
Disconnect power source for
motor lubrication. Failure to do so
may result in injury or death.
Disconnect electrical power prior
to access into a fan or ductwork.
Even when locked out electrically,
fans may cause injury or damage if
the impeller is subject to “wind-
milling.” The impeller should be
secured to physically restrict rota-
tional movement. Failure to secure
impeller can cause severe per-
sonal injury or death.
Coil Cleaning
The frequency of required cleaning is dependent on
the operating hours of the system, filter maintenance
and efficiency and dirt load.
IMPORTANT: COILS BECOME EXTERNALLY FOULED
AS A RESULT OF NORMAL OPERATION. DIRT ON THE
SURFACE OF THE COIL REDUCES IT’S ABILITY TO
TRANSFER HEAT THAT CAN RESULT IN COMFORT
PROBLEMS, INCREASED RESISTANCE TO AIR FLOW
AND THUS INCREASED OPERATING ENERGY COSTS.
IF THE DIRT ON THE SURFACE OF THE COIL
BECOMES WET, SUCH AS COMMONLY OCCURS
WITH COOLING COILS, MICROBIAL GROWTH (MOLD)
CAN RESULT THAT MAY CAUSE UNPLEASANT
ODORS AND SERIOUS HEALTH-RELATED INDOOR
AIR QUALITY PROBLEMS.
Steam, hot water and chilled water coils
Steam, hot water and chilled water coils should be
kept clean to maintain maximum performance. If fins
become dirty, clean with steam and detergent, hot
water spray and detergent, or one of the
commercially available chemical coil cleaners. Rinse
coils thoroughly after cleaning.
WARNING
Follow all directions provided with
chemical cleaners to avoid per-
sonal injury and/or coil damage.
Commercially available chemical
cleaners may contain caustic or
hazardous agents.
Table 50
Fan Bearing Maximum Grease Capacity
Shaft Size in inches Capacity in fl. oz.
1/2 - 3/4
1/7
7/8 - 1-3/16
3/8
1-1/4 - 1-1/2
5/8
1-11/16 - 1-15/16
7/8
2 - 2-7/16
1-1/4
2-1/2 - 2-15/16
2
Table 51
Recommended Motor Greasing Schedule
Avg. Daily
Operating
Hours
Avg.
Environment
.3 to 7.5 HP
Motors
10 to 30 HP
Motors
8-16
Clean and
Dry
Every 5 years Every 3 years
12-24
Moderate Dirt
or Moisture
Every 2 years Every year
Any
Severe (very
dirty or high
temperatures)
Every 6
months
Every 3
months