Johnson Controls F62AA User manual

Installation Sheets Manual 121
Liquid Level, Air Volume and Flow Controls Section
Technical Bulletin F62AA
Issue Date 0592
© 1992 Johnson Controls, Inc. 1
Code No. LIT-121155
F62AA Type
Air Flow Control
Application
The F62AA control detects air
flow or the absence of air flow by
responding only to the velocity of
air movement within a duct. The
control can be wired to open one
circuit and close a second circuit
(SPDT) for either signaling or
interlock purposes.
All Series F62 flow switches
are designed for use only as
operating controls. Where an
operating control failure
would result in personal injury
and/or loss of property, it is
the responsibility of the
installer to add devices
(safety, limit controls) that
protect against, or systems
(alarm, supervisory systems)
that warn of, control failure.
Installation
Mounting
The F62AA can be mounted on
the top, side or bottom of a duct.
Install the control in a horizontal
duct whenever possible. If
vertical duct mounting is
required and flow is downward,
the control must be readjusted.
If flow is upward, refer to the
Flow Rate Table for minimum
flow required to actuate the
control. The maximum air
velocity should not exceed
2000 FPM (10.16 m/s).
Do not install where the control
will be exposed to weather.
Avoid locations close to elbows,
dampers, fans, duct openings or
other areas where excessive
turbulence occurs. The control
should be mounted away from
such areas at least five times
the distance of the smallest duct
dimension. (Example: On a
3 in. × 8 in. duct, mount the F61
at least 15 in. (381 mm) from the
nearest bend). The standard
paddle fits into ducts of 3 in. ×
8 in. (76 × 203 mm) minimum.
The paddle may be trimmed for
installing in ducts as small as
3 in. × 6 in. (76 × 152 mm).
To install, proceed as follows:
1. Select the proper location.
2. Use the mounting plate
gasket as a template and
mark hole positions.
3. Drill or punch screw holes.
4. Cut the center hole large
enough for the paddle to
pass through.
5. In a horizontal duct the case
must be level with the
paddle at approximately a
right angle to the air flow.
6. When the horizontal duct is
not horizontally true, check
with a level and place a
shim under the control
mounting plate (see the
drawings on the following
page).
!
CAUTION: If necessary to
install in a vertical duct with
downward air flow, the
control must be readjusted.
To readjust, turn adjusting
screw clockwise until switch
makes Red to Blue with no
air flow. Then, adjust screw
one additional turn
clockwise.
Fig. 1 -- F62AA Air Flow Control.

2 F62AA Technical Bulletin
Wiring
!
WARNING: Disconnect
the power supply before
wiring connections are
made to avoid electrical
shock or possible
damage to the equipment.
Make all wiring connections
using copper conductors only,
and in accordance with the
National Electrical Code and
local regulations. The
Pennswitch terminals are color
coded as follows: Red is
common, Red closes to Yellow
on air flow increase, Red closes
to Blue on air flow decrease (no
flow).
The circuit between the red and
yellow terminals will close when
the required air flow velocity is
reached within the duct where
the control is installed. An
indicator light or signal, when
connected to the blue terminal,
will be activated when the air
flow decreases or ceases.
!
CAUTION: Use the
terminal screws furnished
(8-32 × 1/4 in. binder head).
Substitution of other screws
may cause problems in
making connections.
Adjustment
!
CAUTION: The control is
factory set at approximately
the minimum flow rate, see
Flow Rate Table. It must
not be set lower than the
factory setting as this may
result in the control failing
to sense a “no flow”
condition.
Note: Sealed adjustments are
not field adjustable.
To increase the setting, remove
the control cover the turn the
adjusting screw clockwise.
Air flow velocities, in FPM, that
are required to actuate the
switch for any given duct size
(horizontal or vertical upward
flow) are shown in the Flow Rate
Table (based on standard air
density of 0.075 pounds per
cubic foot).
Checkout Procedure
The circuit between the red and
yellow terminals will close when
air flows through the duct (where
the control is located) at the
required velocity. When
connected to the red and blue
terminals, the warning light or
signal will activate when the air
flow decreases or ceases.
Before leaving the installation,
observe at least three complete
operating cycles to be sure that
all components are functioning
correctly.
Repairs and Replacement
Field repairs must not be made
except for replacement of the
flow paddle. For a replacement
control or paddle kit, contact the
nearest Johnson Controls
distributor.
Fig. 4 -- Internal view of the F62 Air
Flow Control. Note range adjusting
screw.
Controls Group
507 E. Michigan Street
P.O. Box 423 Printed in U.S.A.
Milwaukee, WI 53202