Mounting
Important:
Mount the switch so that the housing is
level horizontally, or plumb vertically. Use a shim, if
necessary.
You can mount the F262AA switch on the top, side, or
bottom of a duct.
• Mount the switch in a horizontal duct whenever
possible. In a horizontal duct, make sure that the switch
housing is level and the paddle is at approximately a
right angle to the air flow.
Figure 3: Mounting the F262 Switch in a horizontal duct
• When you mount the switch in a horizontal duct that
is not horizontally true, check with a level and place a
shim under the switch mounting plate. Do not mount
the switch without a shim. See the following figure.
Figure 4: Mounting the F262 Switch in an angled duct
• When you mount the switch in a vertical duct where
the airflow is upward as shown in the following figure,
see Table 1 for the minimum flow required to actuate
the switch. The maximum air velocity must not exceed
2,000 fpm (10.16 m/s).
Figure 5: Mounting the F262 control in a vertical duct
• When you mount the switch in a vertical duct where the
airflow is downward as shown in the previous figure,
adjust the switch:
a. Turn the adjustment screw clockwise until the
switch closes the circuit between the red and
blue terminals when there is no air flow. See the
following figure.
b. Turn the adjustment screw one additional turn
clockwise.
Figure 6: F262 Switch action
Location considerations
Important:
Mount the switch so that the housing is
level horizontally or plumb vertically. Use a shim, if
necessary.
Do not use this switch where exposure to outdoor
weather occurs. Use the switch only for indoor situations.
Avoid locations close to elbows, dampers, fans, duct
openings, or other areas where excessive turbulence
occurs.
Mount the switch away from such areas at least five times
the distance of the smallest duct dimension as shown in
the following figure.
Example:
On a 3 in. × 8 in. duct, mount the F261 at least
15 in. (381 mm) from the nearest bend.
Figure 7: Required duct distance
F262 Series Airflow Switch Installation Guide
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