Daikin Skyline IM 777-8, Installation And Maintenance Manual

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www.DaikinApplied.com 33 IM 777-8 • Skyline Air Handler
Table 26: 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 27: Recommended Fan Re-lubrication Grease
Charge
Shaft Size – in . (mm) Oz (g)
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) 0.5 (15.59)
3 to 3-7/16 (75-80) 0.85 (24.10)
3-1/2 to 4 (85-105) 1.5 (42.53)
Fan Drive
WARNING
Before servicing lock out and tag out all power to the
unit . Fans or belts cause severe personal injury or death.
WARNING
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.
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