Table 25: Recommended Lubricants for Fan Shaft Ball
Bearings
Name
Temperature
Base
Thickener
NLGI
Grade
Texaco, Premium
RB
30° to 350°F
(34° to 177°C)
Parafinic
Mineral Oil
Lithium
2
Mobil, AW2
40° to 437°F
(40° to 175°C)
Mineral Oil
Lithium
2
Mobil, SHC 100
68° to 356°F
(50° to 180°C)
Synthetic
Lithium
2
Chevron, Altiplex
Synthetic
60° to 450°F
(51° to 232°C)
Synthetic
Lithium
2
Exxon, Ronex MP
40° to 300°F
(40° to 149°C)
Mineral Oil
Lithium
2
Note:
Temperature ranges over 225°F are shown for lubricants only. High temperature applications
are not suitable for standard air handler components .
Table 26: Recommended Fan Lubrication Grease Charge
Shaft Size in Inches (mm)
Weight in Ounces (grams)
1/2 to 3/4 (20)
0 .03 (0 .85)
7/8 to 1-3/16 (25-30)
0 .10 (2 .84)
1-1/4 to 1-1/2 (35-40)
0 .15 (4 .25)
1-11/16 to 1-15/16 (45-50)
0 .20 (5 .67)
2 to 2-7/16 (55-60)
0 .30 (8 .51)
2-1/2 to 2-15/16 (65-70)
0 .50 (15 .59)
3 to 3-7/16 (75-80)
0 .85 (24 .10)
3-1/2 to 4 (85-105)
1 .50 (42 .53)
Fan Drive Adjustments
WARNING
Before servicing fans, lock out and tag out all power to the
unit . Fans or belts can cause severe personal injury or death .
WARNING
Do not open the hinged access door and screw-fastenerd
access panels while the unit is operating. Moving parts and
strong suction forces can cause severe personal injury or
death .
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 minimizes vibration . 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 .
Measured diameter at motor sheave
Fan RPM = motor RPM ×
Measured diameter at fan sheave
VM/VP Variable Pitch Key Type Sheaves
Mounting:
1 .
Mount all sheaves on the motor or driving shaft with the
setscrews
A
toward the motor.
2 . Verify that both driving and driven sheaves are in
alignment and that shafts are parallel .
3 . Fit internal key
D
between sheave and shaft and lock
setscrew
A
securely in place .
Adjusting:
1 .
Loosen setscrews
B
and
C
in moving parts of sheave
and pull out external key
E
. (This key projects a small
amount to provide a grip for removing .)
2 . To adjust sheave pitch diameter for desired speed, open
moving parts by half or full turns from closed position .
Do
not open more than five full turns for
A belts or six
full turns for B belts .
3 . Replace external key
E
and securely tighten setscrews
B
over key and setscrews
C
into keyway in fixed half of the
sheave .
4 . Put on belts and adjust tension .
Do not force belts over
grooves .
See
Fan Drive Belt on page 42
.
5 . Make future adjustments by loosening the belt tension
and increasing or decreasing the pitch diameter of the
sheave by half or full turns as required . Readjust belt
tension before starting drive .
6 . To provide the same pitch diameter, adjust both halves
of the two-groove sheaves by the same number of turns
from closed position .
7 .
Verify that all keys are in place and that all se screws
are tight before starting drive. Check setscrews and belt
tension after 24 hours service .
Figure 53: VP Type Sheave Adjustment
Two Groove
C
A
B
B
D
E
C
A
D
E
D
C
Single Groove
Key "E" projects
to provide a grip
for removal.
Do not operate
sheeves with flange
projecting beyond
the hub end.
IM 672-11 • VISION AIR HANDLING UNIT 38
www.DaikinApplied.com
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aInTenanCe
