AFA4000/E VAV Airflow Controller / p.72
6.2.2 Chain and sprocket drives
Two types of chain and sprocket drives are available:
• Shaft Drive
• Counterweight Drive
6.2.2.1 Chain and sprocket shaft drives
In the Shaft Drive arrangement, the motor drive utilises a taper bore sprocket and a roller chain
to drive a shaft running between the counterweight pulleys.
The motor assembly is supplied fitted to an adjustable bracket so that the correct chain tension
can be set.
The Shaft Drive arrangement can accommodate one or two sash wires.
Figure 35: Typical chain and sprocket shaft drive installation
6.2.2.2 Installing the chain and sprocket shaft drive
1. Fit the taper bore sprocket to the shaft and ensure that the sprocket is securely fitted.
Where possible positioned the motor drive and sprocket centrally on the shaft. The motor
assembly should be fitted to a rigid framework to support the motor.
2. Loosely fit the chain before fixing the motor plate to ensure the chain is correctly tensioned
and aligned.
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