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Service and Maintenance
Table 23: Recommended Lubricants for Fan Shaft Ball
Bearings
Name
Temperature
Texaco,
30° to 350°F
Premium RB
(34° to 177°C)
Mobile, AW2
40° to 437°F
(40° to 175°C)
Mobile, SHC
68° to 356°F
100
(50° to 180°C)
Chevron,
60° to 450°F
Altiplex
(51° to 232°C)
Synthetic
Exxon, ronex
40° to 300°F
MP
(40° to 149°C)
Note:
Temperature ranges over 225°F are shown for lubricants only. High
temperature applications are not suitable for standard air handler
components.
Table 24: Recommended Fan Relubrication Grease Charge
Shaft Size (in)
OZ.
1/2 to 3/4
0.03
7/8 to 1-3/16
0.10
1-1/4 to 1-1/2
0.15
1-11/16 to 1-15/16
0.20
2 to 2-7/16
0.30
2-1/2 to 2-15/16
0.50
3 to 3-7/16
0.85
3-1/2 to 4
1.50
Fan Drive
Before servicing fans, lock out and tag out all power to the
unit. Fans or belts can cause severe personal injury or death.
AVERTISSEMENT
Avant de faire le service sur les ventilateurs,couper et
indiquer que le courant est coupé. Les ventilateurs ou les
courroies peuvent causer des blessures personnelles graves
ou entraîner la mort.
Do not open the hinged access door and screw-fastened
access panels while the unit is operating. Moving parts and
strong suction forces can cause severe personal injury or
death.
AVERTISSEMENT
Ne pas ouvrir les portes d'accès à charnières et les
panneaux à vis lorsque l'unité fonctionne. Les pièces
mobiles et le niveau de succion peuvent causer des blessures
personnelles graves ou même entraîner la mort.
26
Base
Thickener
Parafinic
Lithium
mineral oil
Mineral oil
Lithium
Synthetic
Lithium
Synthetic
Lithium
Mineral oil
Lithium
Shaft Size
Grams
20 mm
0.85
25-30 mm
2.84
35-40 mm
4.25
45-50 mm
5.67
55-60 mm
8.51
65-70 mm
15.59
75-80 mm
24.10
85-105 mm
42.53
WARNING
WARNING
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
NLGI
and minimizes vibration. Initially, it is best to have a variable
grade
pitched motor sheave for the purpose of air balancing. Once
2
the balance is achieved, fixed sheaves maintain balancing and
alignment more effectively. Replace the adjustable sheaves
2
with fixed sheaves.
2
With the electrical power disconnected, locked and tagged out,
measure the diameter of the V-belt outer surface where it
2
passes around the sheave (pitch diameter). Calculate fan speed
from the motor nameplate rpm.
2
Fan rpm = motor rpm ×
VM and VP Variable Pitch Key Type Sheaves
Mounting
1
Mount all sheaves on the motor or driving shaft with the
setscrews
2
Verify that both driving and driven sheaves are in
alignment and that shafts are parallel.
3
Fit internal key
setscrew
Adjusting
1
Loosen setscrews
pull out external key
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
six full turns for
3
Replace external key
over key and setscrews
sheave.
4
Put on belts and adjust belt tension. Do not force belts
over grooves. See
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.
Measured diameter at motor sheave
Measured diameter at fan sheave
A
toward the motor.
D
between sheave and shaft and lock
A
securely in place.
B
C
and
in moving parts of sheave and
E
. (This key projects a small
B
belts.
E
and securely tighten setscrews
C
into keyway in fixed half of the
Fan Drive Belt Adjustment‚ page
A
belts or
B
30.
Daikin IM 777-7
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