Belimo AFB24-SR - Page 25

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71
I
nstallation Instruction
s
Mechan
i
cal Installat
i
o
n
Determining Torque Loading and Actuator Sizing
D
amper torque loadin
g
s, used in selectin
g
the correct size actuator, should be
provided by the damper manu
f
acturer. I
f
this in
f
ormation is not available, the
f
ollowing general selection guidelines can be used
.
D
am
p
er T
ype
Torque Loadin
g
Opposed blade, without edge seals
,
for non-ti
g
ht close-off applications
3 in-lb/sq. ft
.
Parallel blade, without ed
g
e seals
,
for non-ti
g
ht close-off applications
4
in-lb
/
sq. ft
.
Opposed blade, with edge seals
,
for tight close-off application
s
5
in-lb/sq. ft
.
Parallel blade, with edge seals
,
f
or tight close-o
ff
application
s
7 in-lb/sq. ft
.
T
he above torque loadings will work for most applications with 1000 FPM face
velocity. For applications between this criteria and 2500 FPM, the torque loadin
g
should be increased by a multiplier of 1.5. If the application calls for hi
g
her criteria
up to 3000 FPM, use a multiplier o
f
2.0
.
T
orque Loading Chart
Torque Loading Chart
0
10
20
30
40
50
60
70
80
90
100
2345678910
Torque Loading (in-lb/ sq. ft.)
Damper Area (sq. ft.)
General Information
B
elimo actuators should be mounted indoors in a dry, relatively clean environment
f
ree
f
rom corrosive
f
umes. I
f
the actuator is to be mounted outdoors, a protective
e
n
c
l
osu
r
e
m
us
t
be
used
t
o
s
hi
e
l
d
th
e
ac
t
ua
t
o
r.
F
or new construct
i
on wor
k
,
o
rder dam
p
ers with extended sha
f
ts.
I
n
s
tr
uc
t t
he
installing contractor to allow space
f
or mounting and service o
f
the Belimo actuator on
t
he shaft. The damper shaft must extend at least 3 1
/
2” from the duct. If the shaft
e
xtends less than 3-1/2” or if an obstruction blocks access, the shaft can be extended
with the AV 8-25 shaft extension accessor
y
or the actuator ma
y
be mounted in its short
shaft configuration.
Mechanical Operation
T
he actuator is mounted directl
y
to a dam
p
er sha
f
t u
p
to 1.05” in diameter b
y
means o
f
its universal clamp. A crank arm and several mounting brackets are
a
vailable for a
pp
lications where the actuator cannot be direct cou
p
led to the dam
p
er
s
ha
f
t. The AFB, AFX series actuators provide true spring return operation
f
or reliable
f
ail-sa
f
e application and positive close-o
ff
on air tight dampers. The spring return
sy
stem
p
rovides constant tor
q
ue to the dam
p
er with, and without,
p
ower a
pp
lied to
the actuator. The AFB…-S, AFX…-S versions are provided with two built-in
a
uxiliary switches. These SPDT switches are provided for safety interfacin
g
or
s
ignaling, for example, for fan start-up. The switching function at the fail-safe position
i
s fixed at +10°, the other switch function is ad
j
ustable between +10° to +90°.
Automatic Airtight Dampers/Manual Override
T
he AFB, AFX series provides 95° o
f
rotation and is provided with a graduated
p
osition indicator showin
g
0° to 95°.
Th
e
AFB
,
AFX
h
as a un
i
que
b
u
il
t
i
n manua
l
pos
i
t
i
on
i
ng mec
h
an
i
sm w
hi
c
h
a
ll
ows t
h
e
s
etting of any damper position within its 95° of rotation. A pre-tensioned spring
a
utomatically ti
g
htens the damper when power is applied to the actuator,
compensatin
g
f
or damper seal deterioration.
.
T
he actuator is shipped at +5°
(
5° from full fail-safe
)
to provide automatic
compression a
g
ainst damper
g
askets
f
or ti
g
ht shut-o
ff
. When power is applied, the
manual mechanism is released and the actuator drives toward the
f
ull
f
ail-sa
f
e
p
osition.
Standard Mounting
N
O
TE: The AFB, AFX…series actuator is shi
pp
ed with the manual override
a
djusted
f
or a +5° position at the universal clamp
(
not at
f
ull
f
ail-sa
f
e, 0°
)
.
T
his allows for automatic com
p
ression of dam
p
er blade seals when the
a
ctuator is in use, providin
g
ti
g
ht shut-o
ff
. This assumes that the damper is to
h
ave tight shut-off at the fail-safe position. If tight close-off is desired at the
opp
osite direction
f
rom
f
ail-sa
f
e, the manual override should be released so
t
he actuator can
g
o to the
f
ull
f
ail-sa
f
e position.
S
ee the manual override
i
nstruct
io
ns
.
1. Manually move the damper to the
f
ail-sa
f
e position
(
usually closed
)
. I
f
the sha
f
t
rotated counterclockwise (
), this is a CCW installation. If the shaft rotated
)
clockwise (
), this is a CW installation. In a CCW installation, the actuator side
)
marked “CCW” faces out, while in a CW installation, the side marked “CW” faces
o
ut. All other ste
p
s are identical.
2. The actuator is usually shipped with the universal clamp mounted to the “
CC
W”
s
ide of the actuator. To test for adequate shaft len
g
th, slide the actuator over the
s
haft with the side marked “CCW”
(
or the “CW” side if this is the side with the
clamp). If the shaft extends at least 1/8” through the clamp, mount the actuator
a
s follows. If not, go to the
Short Shaft Installation
section.
n
3
. I
f
the clamp is not on the correct side as determined in step #1, re-mount the
clamp as
f
ollows. I
f
it is on the correct side, proceed to step #5. Look at the
u
niversal clamp. If you are mountin
g
the actuator with the “CCW” side out,
N40103 - 09/11 - Subject to change. © Belimo Aircontrols (USA), Inc
.