Cook AVA Bedienungsanleitung PDF herunterladen (Seite 7)

• Inspect springs and rubber isolators for deterioration

and replace as needed.

• Inspect for cleanliness. Clean exterior surfaces only.

Removing dust and grease on motor housing

assures proper motor cooling. Removing dirt from

the wheel and housing prevent imbalance and dam-

age. housing prevent imbalance and damage.

Lubrication - Fan Bearings

Vane Axial bearings are lubricated through a grease fit-

ting on the exterior of the fan housing and should be

lubricated by the schedule, Lubrication Conditions Chart.

For best results, lubricate the bearing while the fan is in

operation. Pump grease in slowly until a slight bead

forms around the bearing seals. Excessive grease can

burst seals thus reducing bearing life.

Before lubricating, the grease nipple and immediate

vicinity should be thoroughly cleaned without the use of

high pressure equipment. The grease should be supplied

slowly as the bearing rotates until fresh grease slips past

the seal. Excessive pressure should be avoided to pre-

vent seal damage.

Use no more than three injections with a hand-oper-

ated grease gun.

Exceptions to the greasing interval chart:

• Periodic Applications (any break of one week or

more): it is recommended that full lubrication be per-

formed prior to each break in operation.

• Higher Temperature: it is recommended to halve the

intervals for every 30°F increase in operating tempera-

ture above 120°F not to exceed 230°F for standard bear-

ings; High Temperature bearings (optional) can operate

up to 400°F.

• Vertical Shaft: it is recommended that the intervals

should be halved.

Loren Cook Company uses petroleum lubricant in a

lithium base. Other types of grease should not be used

unless the bearings and lines have been flushed clean. If

another type of grease is used, it should be a lithium-

based grease conforming to NLGI grade 2 consistency.

A NLGI grade 2 grease is a light viscosity, low-torque,

rust-inhibiting lubricant that is water resistant. Its temper-

ature range is from -30°F to +200°F and capable of inter-

mittent highs of +250°F. For temperatures above 250°F

Mobiltemp SHC 32 is recommended.

Lubrication - Motor Bearings

Motors are provided with prelubricated bearings. Any

lubrication instructions shown on the motor nameplate

supersede instructions below.

Motor bearings without provisions for relubrication will

operate up to 10 years under normal conditions with no

maintenance. In severe applications, high temperatures

or excessive contaminates, it is advisable to have the main-

tenance department disassemble and lubricate the bear-

ings after 3 years of operation to prevent interruption of

service.

For motors with provisions for relubrication, follow inter-

vals of the table below.

Motors are provided with a polyurea mineral oil NGLI #2

grease. All additions to the motor bearings are to be with a

compatable grease such as Exxon Mobil Polyrex EM and

Chevron SRI.

The above intervals should be reduced to half for vertical

shaft installations.

Motor Services

Should the motor prove defective within a one-year

period, contact your local Loren Cook representative or

your nearest authorized electric motor service representa-

tive.

Changing Shaft Speed

All belt driven AF fans with motors up to and including 5

HP are equipped with variable pitch pulleys. To change the

fan speed, perform the following:

a. Loosen setscrew on driver (motor) pulley and remove

key, if equipped.

b. Turn the pulley rim to open or close the groove facing.

If the pulley has multiple grooves, all must be adjusted

to the same width.

c. After adjustment, inspect for proper belt tension.

Speed Reduction

Open the pulley in order that the belt rides deeper in

the groove (smaller pitch diameter).

Speed Increase

Close the pulley in order that the belt rides higher in

the groove (larger pitch diameter). Ensure that the RPM

limits of the fan and the horsepower limits of the motor

are maintained.

The AVAB and VAB have standard fixed pitch

sheaves. To change speeds, consult factory.

Pulley and Belt Replacement

a. Remove pulleys from their respective shafts.

b. Clean the motor and fan shafts.

c. Clean bores of pulleys and coat the bores with heavy

oil.

d. Remove grease, rust, or burrs from the pulleys and

shafts.

e. Remove burrs from shaft by sanding.

f. Place fan pulley on fan shaft and motor pulley on its

shaft. Damage to the pulleys can occur when exces-

sive force is used in placing the pulleys on their

respective shafts.

Relubrication Intervals

Service

Conditions

NEMA Frame Size

Up to and

including 184T

213T-365T 404T and larger

1800 RPM

and less

Over 1800

RPM

1800 RPM

and less

Over 1800

RPM

1800 RPM

and less

Over 1800

RPM

Standard 3 yrs. 6 months 2 yrs. 6 months 1 yr. 3 months

Severe 1 yr. 3 months 1 yr. 3 months 6 months 1 months

Lubrication Conditions Chart

Fan Class Fan Status

Fan Operating

Temperature (F)

Maximum Interval

(operational hrs)

Inlet Vane

Axial Blowers

Normal Conditions

(Clean, Dry & Smooth)

up to 120 4,500

121 to 160 1,500

161 to 200 700

201 to 400 (*) 200

Extreme Conditions

(Dirty/Wet/Rough)

up to 160 700

161 to 200 400

201 to 400 (*) 200

1 2 3 4 5 6 7 8 9 10 11 12

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