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| Adjustment and maintenance operations
R.6.3 Rotary heat exchanger
R.6.3.1 Rotor
The rotor is to be checked at least once a year to ensure that it can turn freely and easily. This can be done by removing
the belt drive at the motor and then turning the rotor manually with a hand on the peripheral rotor casing. At the same
time the brush seals are to be checked for damage. The bearings are factory lubricated and do not require any service
lubrication. During operation the rotor can become dirty. The rotor can be cleaned by blowing through with compressed
air.
To ease inspection and service the rotor can be pulled out of the sizes 10, 11, 12, 14 and 16.
R.6.3.2 Motor and belt drive
The bearings are factory lubricated and do not require any service lubrication. The belt drive is to be checked for correct
tightness and that it is undamaged. On smaller AHU, the rotor is fitted with an elastic belt drive and supplied with a re-
serve belt on the rotor. This belt drive does not require service and cannot be shortened. A new belt can be fitted using
specialist tools. On larger heat exchangers the rotor has a V-belt with a belt connector. If the belt is no longer tight, it
must be shortened to a length which enables the motor base frame tightening spring to hold the belt tight. If new
screws are used for the belt connector, they must not have a length which exceeds the thickness of the belt and con-
nector. Remove the excess, if any, with a file.
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