Selection Guide

800-543-9038 USA 866-805-7089 CANADA 203-791-8396 LATIN AMERICA
67
•
Torque min. 90 in-lb, for control of air dampers
A
pp
l
i
cat
i
o
n
F
or On/Off, fail-safe control of dampers in HVAC systems. Actuator sizing should be
d
one in accordance with the damper manufacturer’s specifications. Control is On/Off
f
rom an auxiliary contact, or a manual switch.
T
he actuator is mounted directl
y
to a dam
p
er shaft u
p
to 1.05” in diameter b
y
means
o
f its universal clamp. A crank arm and several mountin
g
brackets are available for
a
pplications where the actuator cannot be direct coupled to the damper shaft
.
O
peratio
n
T
he NFB and NFX series actuators provide true spring return operation for reliable fail-
s
afe application and positive close off on air ti
g
ht dampers. The sprin
g
return system
p
rovides constant tor
q
ue to the dam
p
er with, and without,
p
ower a
pp
lied to the
a
ctuator
.
T
he NFB and NFX series provides 95° of rotation and is provided with a graduated
p
osition indicator showin
g
0° to 95°.
T
he actuator ma
y
be stalled an
y
where in its normal rotation without the need of
m
ec
h
a
ni
ca
l
e
n
d
s
wit
c
h
es.
T
he NFB24-
S
and NFX24-
S
versions are provided with two built-in auxiliary switches.
T
hese SPDT switches are provided for safety interfacing or signaling, for example, for
f
an start-up. The switchin
g
f
unction at the
f
ail-sa
f
e position is
f
ixed at +10°, the other
s
witch function is ad
j
ustable between +10° to +90°. The NFB24, NFB24-
S
, NFX24
a
nd NFX24-S actuator is shipped at +5°
(
5° from full fail-safe
)
to provide automatic
c
ompression against damper gaskets for tight shut-off
.
Dimensions (Inches [mm])
K7-2 (supplied)
1/2" Centered
(Default)
3/4" Centered
(Field Selectable)
1.05" Centered
(Field Selectable)
WAFBNFBDi
m
NFB24, NFB24-
S
, NFX24, NFX24-
S
On/Off, Sprin
g
Return, 24
V
Technical Data NFB24, NFB24-S, NFX24, NFX24-S
P
ower su
pp
l
y
24 VAC ± 20% 50/60 H
z
24 VDC +20% / -10%
Power consumptio
n
runnin
g
6
W
holdin
g
2.
5
W
Transformer sizin
g
8.5 VA
(
class 2 power source
)
El
ectr
i
ca
l
connect
i
o
n
NFB24..
.
3 ft, 18 GA appliance cable, 1/2" conduit
connecto
r
-
S
m
ode
l
s
: two 3 ft, 18
g
au
g
e appliance cables
with 1/2” conduit connectors
NFX
24..
.
3 ft
[
1m
]
, 10 ft
[
3m
]
or 16 ft
[
5m
]
18 GA
a
pp
liance or
p
lenum cables, with or without 1/2”
conduit connecto
r
-
S
models: two
3
f
t [1m], 10
f
t [3m] or
16 ft [5m] appliance cables, with or without 1/2"
conduit connectors
Overload protectio
n
electronic throu
g
hout 0 to 95° rotation
C
ontro
l
on
/
of
f
Tor
q
u
e
90 in-lb
[
10 Nm
]
minimu
m
Direction o
f
rotatio
n
s
prin
g
reversible with CW/CCW mountin
g
Mechanical an
g
le o
f
rotatio
n
95°
(
ad
j
ustable with mechanical end stop, 35° to
95°
)
R
unning tim
e
mo
t
o
r
< 75 second
s
sprin
g
20 seconds
@
-4°F to 122°F [-20°
C
to 50°
C
];
< 60 seconds @ -22°F
[
-30°C
]
Pos
iti
o
n in
d
i
ca
ti
on
visual indicator
,
0° to 95
°
(
0° is full sprin
g
return position
)
M
anua
l
overr
ide
5 mm
h
ex cran
k
(
³⁄
₁₆
"
All
en
)
, supp
li
e
d
H
um
idi
t
y
max. 95%
RH
non-con
d
ens
i
n
g
A
m
bi
ent temperatur
e
-22°F to 122°F
[
-30°
C
to 50°
C]
S
tora
g
e temperatur
e
-40°F to 176°F
[
-40°
C
to 80°
C]
H
ous
i
n
g
N
ema 2,
IP
54,
E
nc
l
osure
T
ype
2
H
ousin
g
materia
l
zinc coated metal and plastic casin
g
Ag
ency listin
g
s
†
cULus acc. to UL60730-1A/-2-14,
C
AN
/CS
A E60730-1:02,
C
E acc. t
o
2004/108/EC & 2006/95/EC
No
i
se
l
e
v
e
l <50dB(A) motor
@
75 second
s
≤62dB(A) spring return
Servicin
g
maintenance
f
re
e
Q
ualit
y
standar
d
I
SO
900
1
Wei
g
h
t
4.15 lbs
(
1.9 k
g)
; 4.4 lbs
(
2.0 k
g)
with switche
s
† Rated Impulse Voltage 800V, Type of action 1.AA (1.AA.B for -S version), Control Pollution Degree 3.
NFB24-
S
, NFX24-
S
A
uxiliary switche
s
2 x
S
PDT 3A (0.5A)
@
250 VA
C
, UL approve
d
one set at +10°, one adjustable 10° to 90°
M40024 - 05/10 - Subject to change. © Belimo Aircontrols (USA), Inc.