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Model H-G/H-GB Centrifugal Roof Exhaust Fan

Table 3: Grease Manufactures

Manufacturer 

Grease (NLGI #)

U.S. Electric Motors

Grease No. 83343

Chevron U.S.A. Inc

Chevron SRI Grease #2

Mobil Oil Corporation

Mobilith

Mobil 532

Texaco, Inc.

Premium BRB #2

Texaco Multifak #2

Amoco Oil Co.

Rykon Premium #2

Exxon

Unirex N2

Shell

B Shell Alvania #2

Table 2: Suggested Fan Bearing Greasing Intervals

Interval 

(months)

Type of Service

 to 3

Heavy duty in dirty, dusty locations; high ambient 
temperatures; moisture laden atmosphere; 
vibration.

3 to 6

12 to 24 hours per day, heavy duty, or if moisture 
is present

6 to 

8 to 16 hours per day in clean, relatively dry 
atmosphere

 to 8

Infrequent operation or light duty in clean 
atmosphere

  8.  Grease should be pumped in very slowly until a slight 

bead forms around the seal. A high grade lithium 
base grease should be used.

  9.  To ensure tightness check pulley setscrews. Proper 

keys must be in keyways.

10.  Fan RPM should not be readjusted. Only use pulleys 

of identical size and type when replacing pulleys.

11.  During the first few months of operation check 

bearing set screws periodically to ensure tightness.

12.  If unit is to be left idle for an extended period, 

remove belts and store in a cool, dry place to avoid 
premature belt failure.

Recommended Relubrication Frequency in 

Months

NOTE: If unusual environment conditions exist (extreme 
temperature, moisture or contaminants) more frequent 
lubrication is required.
A good quality lithium base grease, conforming to NLGI 
Grade 2 consistency, such as those listed here may be 
used.

Dampers must open 

fully. Use motorized 

dampers in low airflow 

applications to reduce 

losses.

Avoid sharp turns or 

entrance conditions 

which cause uneven 

flow. Use turning vanes 

in elbows to reduce 

adverse effects.

Provide uniform 

airflow at fan inlet 

to assure optimum 

performance.

Provide uniform airflow at fan inlet 

and through the damper to assure 

optimum performance. The curb cap 

should be three wheel diameters 

from the radius. Use turning vanes in 

duct when possible.

Fan Inlet Connections

In order to assure proper fan performance, caution must be exercised in fan placement and connection to the 
ventilation system. Obstructions, transitions, poorly designed elbows, improperly selected dampers, etc, can cause 
reduced performance, excessive noise and increased mechanical stress. For performance to be as published, the 
system must provide uniform and stable airflow into the fan.

Poor

Good

Poor

Good

Poor

Good

Poor

Good

Summary of Contents for H-G 060

Page 1: ...nt should be checked to make sure it is not exceeding the motor nameplate amps 5 Do not allow the power cable to kink or come in contact with oil grease hot surfaces or chemicals Replace cord immediat...

Page 2: ...e necessary depending upon roofing material thickness The motor amperage and voltage ratings must be checked for compatibility to supply voltage prior to final electrical connection For H G H GB insta...

Page 3: ...of rust occur Immediately remove the original rust preventive coating with petroleum solvent and clean with lint free cloths Polish any remaining rust from surface with crocus cloth or fine emery pape...

Page 4: ...ring leads or check motor wiring for single phase Table 1 Model Fasteners Per Side Total Fasteners H G 060 141 3 12 H G 150 180 5 20 H GB 071 161 3 12 H GB 180 300 5 20 5 Secure fan to curb Fasteners...

Page 5: ...071 161 1 4 6 H GB 180 240 3 8 10 H GB 260 300 1 2 13 Do not force belt s Forcing the belt s will break the cords and cause belt failure Belts Fig 11 Slack Side Deflection Fig 14a Fig 14b 11 Belt ten...

Page 6: ...elt Bearing Maintenance H GB Unit 1 Belts tend to stretch after a period of time They should be checked periodically for wear and tightness When replacing belts use the same type as supplied with the...

Page 7: ...If unit is to be left idle for an extended period remove belts and store in a cool dry place to avoid premature belt failure Recommended Relubrication Frequency in Months NOTE If unusual environment...

Page 8: ...Deck Anchoring Metal Building Steel Deck Anchoring Wood Deck Anchoring Fig 15 Minimum Concrete Strength of 2000 PSI Roof Opening Roof Opening Center fasteners on flange Outside Flange Use 12 Wood Scre...

Page 9: ...uctwork Check proper operation of face and bypass dampers Check filters and access doors FAN DOESN T OPERATE Electrical Supply Check fuses circuit breakers Check for switches off Check for correct sup...

Page 10: ...on Model Volts Hertz Phase Amps Mark Supply hp Exhaust hp Serial Number Motor Voltage Motor Amperage Fan rpm Service Organization Address City State Zip Phone Fax Work Done By Field Start Up Documenta...

Page 11: ...ng service and replacement parts Before taking any corrective action make certain unit is not capable of operation during repairs CAUTION A fan manufactured with an explosion resistant motor does not...

Page 12: ...k will not be responsible for any removal or installation costs As a result of our commitment to continuous improvement Greenheck reserves the right to change specifications without notice Greenheck C...

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