Johnson Controls F62AA Manual de usuario

Installation Sheets Manual 121

Liquid Level, Air Volume and Flow Controls Section

Technical Bulletin F62AA

Issue Date 0592

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

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