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8

Centrifugal Single-Width Blower

®

Recommended Bearing Lubrication Schedule

Relubrication Schedule in Months

Standard Grease

Fan

RPM

Bearing Bore (mm)

20 - 25

30 - 35

40 - 45

50 - 55

60 - 65

To 250

12

12

12

12

12

500

12

12

11

10

8

750

12

9

8

7

6

1000

12

7

6

5

4

1250

12

6

5

4

1500

12

5

4

3

2000

12

3

3

2

2500

12

2

2

3000

12

2

3500

12

4000

12

5000

12

 

Replenishing  

Quantity  

(gms)

2.5

4.5

6

8

10.5

Bearing Lubrication Schedule

Shaft bearings are the most critical moving part of a 
fan. Therefore, special attention should be given to 
keeping the bearings clean and well lubricated. Proper 
lubrication provides for reduction in friction and wear, 
transmission and dissipation of heat, extended bearing 
life and prevention of rust.
In order for a lubricant to fulfill these tasks, the proper 
grease applied at regular intervals is required. See the 
recommended bearing lubrication schedule below.

•  Lubrication interval is based on 12 hour per day 

operation and maximum 80°C housing temperature. For 
24 hour per day operation, the interval should be cut in 
half.

•  Lubricant should be added with the shaft rotating and 

until clean grease is seen purging from the bearing. 
The lubrication interval may be modified based on the 
condition of the purged grease. If bearing is not visible to 
observe purged grease, lubricate with number of shots 
indicated in chart for bore size.

•  For conditions including high temperatures, moisture, dirt 

or excessive vibration, consult the factory for a specific 
lubrication interval for your application.

•  Factory recommends VT307 lubricant.

In addition to lubricating the bearings at specified 
intervals, adapter sleeves and locking collar should 
be checked for tightness. A bearing collar which has 
loosened will cause premature failure of the fan shaft. 
Fasteners attaching the bearings to the drive frame 
should also be checked.

Wheel and Fastener Maintenance

Wheels require very little attention when exhausting 
clean air, however, air heavily laden with grease or 
dirt will tend to accumulate on the wheel causing 
unbalance. Wheels exhausting dirty or grease-laden air 
require frequent cleaning to assure smooth and safe 
operation.
All fasteners, including set screws in the bearing 
collars, should be checked for tightness each time 
maintenance checks are performed.
A proper maintenance program will help preserve the 
performance and reliability designed into the fan.

Summary of Contents for CSB

Page 1: ...to rotate without striking or rubbing any stationary objects 3 Motor must be securely and adequately grounded 4 Do not spin fan wheel faster than the maximum cataloged fan RPM Adjustments to fan speed with Variable Frequency Drives VFD may affect motor load If the fan RPM is changed the motor current should be checked to make sure it is not exceeding the motor nameplate amps 5 Do not allow the pow...

Page 2: ...atures should be evenly maintained between 30 to 110 F 1 to 43 C wide temperature swings may cause condensation and sweating of metal parts All accessories must be stored indoors in a clean dry atmosphere Remove any accumulations of dirt water ice or snow and wipe dry before moving to indoor storage To avoid sweating of metal parts allow cold parts to reach room temperature To dry parts and packag...

Page 3: ... assure no parts are rubbing 3 Ensure wheel backplate is equidistant from inlet cone ID on both sides in case of double wide wheel for proper wheel centering Table of Contents System Set Up 4 Installation Discharge Positions 5 Method for Wheel Centering 5 V Belt Drive Installation 5 Alignment of Pulleys and Belts 5 Wheel Rotation 5 Unit Start Up Visual Inspection of Equipment 6 Check 6 Additional ...

Page 4: ... 6 0 4 R o t ati One fan wheel diameter 3 4 to one fan wheel diameter One fan diameter 3 4 to one fan wheel diameter Parallel Fan Installation System Set Up Installations with inlet or discharge configurations that deviate from this manual may result in reduced fan performance Restricted or unstable flow at the fan inlet can cause pre rotation of incoming air or uneven loading of the fan wheel yie...

Page 5: ...sheaves on shafts Do not drive sheaves on as this may result in bearing damage 3 Align fan and motor sheaves with a straight edge or string and tighten 4 Place belts over sheaves Do not pry or force belts as this could result in damage to the cords in the belts 5 Adjust the tension until the belts appear snug Run the unit for a few minutes and allow the belts to set properly 6 With the fan off and...

Page 6: ...ding on how it has been wired To reverse rotation of a 3 phase motor interchange any two of the three electrical leads Single phase motors can be reversed by changing internal connections as described on the motor label or wiring diagram 2 Fans with multi speed motors should be checked on low speed during initial start up 3 Check for unusual noise vibration or overheating of bearings Refer to the ...

Page 7: ...o loose or too tight or misaligned sheaves Abnormally high belt tension or drive misalignment will cause excessive bearing loads and may result in failure of the fan and or motor bearings Conversely loose belts will cause squealing on start up excessive belt flutter slippage and overheated sheaves Either excessively loose or tight belts may cause fan vibration When replacing V belts on multiple gr...

Page 8: ...ting and until clean grease is seen purging from the bearing The lubrication interval may be modified based on the condition of the purged grease If bearing is not visible to observe purged grease lubricate with number of shots indicated in chart for bore size For conditions including high temperatures moisture dirt or excessive vibration consult the factory for a specific lubrication interval for...

Page 9: ... procedures Before putting the new bearings on the shaft you may need to break what is called swivel torque on the bearings depending on style of bearing This is done by holding the bearing housing securely and being able to move the inner bearing race around freely 2 Apply light film of oil on shaft then gently slide the new bearings onto the shaft Do not hammer bearing onto shaft 3 Align bearing...

Page 10: ...tude Resize ductwork Clean filters coils Change fan speed High Motor Amp Draw Fan Check rotation of wheel Reduce fan speed Duct System Resize ductwork Check proper operation of isolation and bypass dampers Check filters and access doors Fan Doesn t Operate Electrical Supply Check fuses circuit breakers Check for switches turned off or disconnected Check for correct supply voltage Drive Check for b...

Page 11: ...____________________________ ________________________________________________ ________________________________________________ Date________________ Time________________ AM PM Notes ___________________________________________ ________________________________________________ ________________________________________________ ________________________________________________ ____________________________...

Page 12: ...n within the product area tab and in the Technical Data Library info greenheck co in www greenheck co in www greenheck com Our Commitment AMCA Publication 410 96 Safety Practices for Users and Installers of Industrial and Commercial Fans provides additional safety information This publication can be obtained from AMCA International Inc at www amca org 484640 CSB Rev 1 June 2020 Copyright 2020 Gree...

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