VTS VENTUS PRO PVS 18x21 [31/34] Renewing the grease fill

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OIMM – VENTUS PRO

When the end of the relubrication interval t, has been reached, the used grease in the bearing should be

completely removed and replaced by fresh grease. As stated before, under normal conditions, the free space

in the bearing should be completely lled and the free space in the housing lled to between 30 and 50 % with

fresh grease. Great care should be taken to see that contaminants are not introduced into the bearing or housing

when relubrication.

Before checking the fan system, it will be necessary to shut down the fan. During inspection, the unit must be

isolated electrically and all disconnected switches and other controls must be locked in the “off” position. Also,

• If the problem still can not be solved, it is recommended to contact the “unit manufacturer”

System checklist

A systematic check of items listed below may identify the problem. See that:

a) impeller rotation is correct,

b) pulley are aligned,

c) belts are not loose or too tight,

d) belts and/or pulley are not worn,

e) ow surfaces of fan (impeller blades, housing and passages between inlets) are clean,

f) impeller and housing are not damaged,

g) coils, lters, ducts are clean.

If the cause of the problem still can not be found, consult air handling unit manufacturer. Manufacturer may need

following information:

k) complete drawings including unit location, ductwork detail, model and size of the unit,

l) measured and design performance gures,

m) system design calculations,

n) measured fan performance gures such as fan static pressure, air volume, current drawn, fan speed, air

temperature and altitude etc.

3.10.8.3