TEL AFA4000/2, Инструкция по установке и эксплуатации

Страница: 61 / 177

AFA4000/2 Airflow Monitor / p.61
•
The installation is part of a new build or retro-fit.
•
The size and configuration of the fume hood.
•
The fume hoods location.
None of these options preclude manual operation of the sash.
6.3.1 Rack and pinion motor drive
The Rack and Pinion Motor Drive uses a rack fitted directly onto the sash frame and a
motor drive assembly fitted to a framework above the fume hood.
This drive system is ideal for retro-fit installations where there is no access to the sash
wires or counterweights and / or where the sash is fitted to a metal framework, for
example combination type sash fume hoods.
6.3.1.1 Installing the rack and pinion drive
1. Raise the sash to the fully open position.
2. Offer up the motor assembly and rack to ensure that there is a clearance of at least
1.2 m (47.24") above the top of the sash.
Note: The rack is supplied in 1m (39.37") lengths
3. The motor drive assembly should be fitted to a rigid framework and positioned
centrally above the sash. To ensure that the T-bar fixing clears the bottom of the
motor assembly, there should be at least 50 mm between the top of the sash and the
bottom of the motor drive assembly, when the sash is fully opened.