Advertisement
D340 | Installation Guide | 5.0 Mounting
5.0 Mounting
5.1
Preparing the Duct
You must verify the duct air flow and velocity. The
D340 is designed for use in air handling systems with
air velocities between 300 ft/min and 4000 ft/min
(1.5 m/sec to 20.3 m/sec). Check the HVAC
engineering specifications to ensure the air velocity in
the duct falls within these parameters. If necessary, use
a velocity meter to check the air velocity in the duct.
5.1
Determining the Mounting Location
To obtain a representative air sample, avoid
stratification and dead air space. These conditions can
be caused by return duct openings, sharp turns,
connections, or long, uninterrupted runs. For this
reason, place the D340 in the range of six to ten times
the width of the duct from any uninterrupted run.
Refer to Figure 4 and Figure 5.
Figure 4:
Typical D340 Placement – Example A
1
2
1 - Bend or other obstruction
2 - Six to ten times the width of the duct
3 - Width of duct
Figure 5:
Typical D340 Placement – Example B
1
2
1 - Return air inlet
2 - Six to ten times the width of the duct
3 - Width of duct
4
5.2
Positioning the D340
The D340 can be mounted in any direction of 90°
increments without regard to the air flow direction
(Figure 6).
Figure 6:
D340 Positions
2
2
3
2
3
1 - Air flow
3
2 - Correct mounting position
3 - Incorrect mounting position
Bosch Security Systems, Inc. | 7/09 | F01U071685-06
1
2
1
2
1
2
1
3
1
1
1
1
Advertisement
