CompAir 5280D.1.IAC Operator's Handbook Manual page 22

7.7 Drive Belts see appendix 3 for details on alignment & tensioning.
When a separate electric motor is used the compressor is driven by a matched set of vee or wedge
belts. Correct compressor speed is achieved by selecting the appropriate size of motor pulley.
If an individual belt needs replacement, it is advised a complete matched set are fitted
When installing new belts, reduce the centre distance by slackening the slide rail screws so that the
belts can be fitted without undue force. Clean any oil or grease from the pulley and flywheel and remove
rust and burrs.
See MAINTENANCE Section for correct tensioning.
Alignment of flywheel and pulley must be properly lined with straight edge or fine wire along the
innermost belt grooves. Check vertical alignment with a spirit level or plump line across pulley faces.
Note: In the case of direct coupled units, the motor and compressor shafts should be aligned with a
clock gauges to within 0.05 mm.
Motor Slide Rails are positioned so that the motor can be slid toward the compressor sufficiently to
allow the belts to be easily changed.
See MAINTENANCE Section "take up allowances".
7.8 Pipework
Most air pipework is likely to be at a high level. Water pipework and condensate pipework is usually at a
lower level.
It is preferable for the cooling water return to be by way of a flow meter so that it can be monitored.
To protect the environment condensate drains can be arranged for discharge to a purpose designed
surge vessel, to separate the air from the liquid mixture, from via a large bore solenoid or manually the
condensate can be drained for collection in a container for safe disposal.
As a basic rule keep all air delivery pipework between compressor and air receiver as short as possible
and do not reduce the diameter below the size of the unit delivery flange. This also applies to the flange
sizes of any ancillary equipment installed before the receiver. i.e. non-return valves, etc.
For any change of direction in the pipework, use long or short radius bends instead of elbows. If
possible do not use tee pieces; use swept bends.
Air pressure switch control pipework between compressor and receiver should normally be 6 mm bore.
For long lengths a larger bores size may be needed.
7.9 Anti-vibration Mounts
When correctly installed, the AV mounting will not need further adjustment. The mountings incorporate a
jacking mechanism enabling the installer to level the unit and ensure the damping device operates
correctly.
As supplied the levelling bolts should be slackened so that there is no excess spring load imposed on
the AV mounts during transit.
Lower the set to the floor and allow the full weight of the unit to rest on the mountings. Screw each
levelling bolt down until resistance is felt. This indicates that the bolt has contacted the spring pressure
plate Continue screwing the bolt by a further 2 to 3 turns. This will lift the top cover assembly and the
compressor unit relative to the base of the mount.
When Anti-Vibration mounts are fitted observe any rocking movement during run up or run down. If
movement is excessive, tighten levelling bolts evenly. The higher the mountings are raised the more
quickly the movement will decay. With mounts correctly set the unit will rock slightly when pushed by
hand.
WARNING Do not try to raise the mounting above the maximum working height as this will cause the
springs to artificially compress and reduce absorption.
If it is necessary to remove the unit from the installed position it is essential to slacken the adjusting
bolts fully before lifting the unit.
Once the mounts are adjusted satisfactorily - tighten the locknuts
CompAir UK Ltd
5280D Compressor Publication 98407.1440
Page 19
1440.doc