About this task:
The following table shows airflow velocities in fpm required to activate the switch for any given duct size, with horizontal
or vertical upward flow. The flow rate table is based on a standard air density of 0.075 lb/ft
3
(1.2 kg/m
3
).
Table 1: Flow rate table, fpm (m/s)
Minimum air velocity required to activate control
Horizontal flow
Vertical flow
Paddle
width
Switch actuation on
flow
50 in.
2
(323 cm
2
) or
larger duct area
Less than 50 in.
2
(323 cm
2
) duct area
50 in.
2
(323 cm
2
) or
larger duct area
Less than 50 in.
2
(323 cm
2
) duct area
Increase
R to Y closes
625 (3.2)
575 (2.9)
950 (4.8)
750 (3.8)
2-1/8 in.
Decrease
R to B closes
325 (1.7)
220 (1.1)
850 (4.3)
575 (2.9)
Increase
R to Y closes
500 (2.5)
350 (1.8)
750 (3.8)
500 (2.5)
3-1/8 in.
Decrease
R to B closes
250 (1.3)
100 (0.5)
650 (3.3)
350 (1.8)
To adjust the setting of the flow switch, complete the following steps:
1. Disconnect the power supply before you make any
electrical connections.
2. Remove the enclosure cover.
3. Adjust the switch’s flow rate. For more information,
see the following figure.
- Turn the adjustment screw counterclockwise
to lower the flow rate required to activate the
switch.
- Turn the adjustment screw clockwise to raise
the flow rate required to activate the switch.
Figure 9: Flow rate adjustment
Note:
Do not lower the flow rate required to
activate the switch unless it is set above the
factory set flow rate.
4. Replace the enclosure cover and tighten the cover
screws with 12 in•lb of torque.
Checkout procedure
The circuit between the red and yellow terminals closes
when air flows through the duct where the switch is
located at the required velocity. When you connect to
the red and blue terminals, the warning light or signal
activates when the air flow decreases or ceases.
Before leaving the installation, observe at least three
complete operating cycles to make sure that all
components function correctly.
Ordering information
Table 2: Replacement paddle kits for F262 Switch
Product code Description
PLT112-1R
2-1/8 in. wide x 6-7/8 in. long (54 mm x
175 mm) paddle
PLT112-2R
3-1/8 in. wide x 6-7/8 in. long (79 mm x
175 mm) paddle
Repair information
Do not make field repairs, except for replacement of the
flow paddle. For a replacement control or paddle kit,
contact the nearest Johnson Controls
®
/Penn distributor.
F262 Airflow Switch technical
specifications
Table 3: F262 Series Airflow Switch electrical ratings
UL 60730/UL 1059
EN 60730
Volts 50/60 Hz
24
120 208 240
24
230
Horsepower
–
1
1
1
–
–
Full load amperes
–
16
10
10
–
8
Locked rotor
amperes
–
96
60
60
–
48
Resistive
amperes
16
16
10
10
16
16
Pilot duty VA
125 720 720 720
77
720
F262 Series Airflow Switch Installation Guide
5
