Product manual

McQuay IM 782-4 41
Service and Maintenance
Service and Maintenance
Periodic Service and Maintenance
1 Check all moving parts for wear every six months.
2 Check bearing collar, sheave, and wheel hub setscrews,
sheave capscrews, and bearing hold-down bolts for
tightness every six months.
Ball Bearing Lubrication
1 Motor bearings—All ball bearings are prelubricated and
do not require additional grease during installation.
However, periodic cleaning out and renewal of grease is
necessary. Exercise extreme care when cleaning to
prevent foreign matter from entering the bearing. It is
also important to avoid over greasing. Only use a high
grade, clean mineral grease with the following
characteristics.
a Melting point preferably over 302°F (150°C).
b Does not separate by oil and soap under operating and
storage conditions.
c Free of abrasive matter, acid, alkali, and moisture.
d Specific greasing instructions are located on a label
attached to the fan section door.
2 Fan shaft bearings—All ball bearings are prelubricated
and do not require additional grease during installation.
Periodic greasing is necessary. Bearings are accessible in
the fan section. A grease fitting is located on each side of
the fan shaft. Do not over lubricate. Wipe off any
excess grease to prevent overheating. The lubrication
interval varies with the period of operation and
temperature of the ambient air. Use the guidelines in the
table below:
Figure 38: Fan Shaft Bearing Grease Fitting
Note: Note:Temperature ranges over 225°F are shown for lubricants only.
High temperature applications are not suitable for standard air
handler components.
Fan Drive Adjustments
Upon completion of the air balance, replace the variable
pitched motor sheave with a properly sized, fixed sheave. A
matching fixed sheave provides longer belt and bearing life
and vibration-free operation. Initially, it is best to have a
variable pitched motor sheave for the purpose of air balancing.
Once the balance is achieved, fixed sheaves maintain
balancing and alignment more effectively. Replace the
adjustable sheaves with fixed sheaves.
With the electrical power disconnected, locked and tagged out,
measure the diameter of the V-belt outer surface where it
passes around the sheave (pitch diameter). Calculate fan speed
from the motor nameplate rpm.
VM and VP Variable Pitch Key Type Sheaves
Mounting:
1
Mount all sheaves on the motor or driving shaft with the
setscrews
A toward the motor.
Table 31: Bearing Operating Temperature Range
Bearing operating temperature range
Operation
To 130°F
(54°C)
To 150°F
(66°C)
Over 150°F
(66°C)
Continuous operation 6 months 4 months 2 months
12-hr/day operation 12 months 12 months 6 months
Grease
(one each side
of fan shaft)
fitting
Table 32: Lubricants Recommended for Fan Shaft Ball
Bearings
Manufacturer
Product
name
Temperature range
°F °C
Texaco Lubricants
Company
Premium RB –30 to 300 –34 to 149
Keystone Ind. Lubricants 81EP-2 0 to 250 –18 to 121
Mobil Oil Corporation
Mobilith
SCH100
–40 to 350 –40 to 177
Chevron U.S.A. Inc. SRI-2 –20 to 325 –29 to 163
Exxon Company, U.S.A. Ronex MP –40 to 300 –40 to 149
Shell Oil Company Alvania No. 2 –20 to 240 –29 to 116
WARNING
ROTATING FAN can cause severe injury or death. Before
servicing fans, lockout and tag out power.
Do not open the hinged access door and access panels while
the unit is operating. Moving parts and strong suction forces can
cause severe personal injury or death.
Before entering any fan section, make sure the electrical power
source to the fan motor is disconnected, locked out and tagged
out.
AVERTISSEMENT
PIÈCES MOBILES DANGEREUSES.
Avant de réparer ou entretenir les ventilateurs, coupez
l’alimentation èlectrique de cet appareil et bloquez le
commutateur à OFF.
Fan rpm = Motor rpm ×
Measured diameter at motor sheave
Measured diameter at fan sheave