AbsolutAire NMCB24-3 User Manual
160
I20618 - Subject to change. © Belimo Aircontrols (USA), Inc.
NMCB24-3 (-T)
On/Off-Floating Point Control, Non-Spring Return, Direct Coupled, 24 V
Technical Data NMCB24-3
Power Supply 24 VAC ± 20% 50/60 Hz
24 VDC ± 10%
Power Consumption 2 W (0.2 W)
Transformer Sizing 4 VA (Class 2 power source)
Electrical Connection 3 ft, 18 GA plenum rated cable
1/2” conduit connector
Overload Protection electronic throughout 0 to 95° rotation
Control on/off, floating point
Input Impedance 600Ω
Angle of Rotation max. 95°, adjust. with mechanical stop
Torque 90 in-lb [10 Nm]
Direction of Rotation reversible with switch
Position Indication reflective visual Indicator (snap-on)
Manual Override external push button
Running Time 45 seconds, constant independent of load
Humidity 5 to 95% RH non condensing
(EN 60730-1)
Ambient Temperature -22°F to +122°F [-30°C to +50°C]
Storage Temperature -40°F to +176°F [-40°C to +80°C]
Housing NEMA 2/IP54
Housing Material UL94-5VA
Agency Listings cULus acc. to UL 60730-1/-2-14 and
CAN/CSA C22.2 No.24, CE according
to 73 / 23 / EEC
Noise Level <45dB(A)
Servicing maintenance free
Quality Standard ISO 9001
Weight 1.7 lbs [0.75 Kg]
NMCB24-3-T
Electrical Screw terminal (for 26 to 14 GA wire)
Connection
Housing NEMA 1/IP20
Torque min. 90 in-lb for control of damper
surfaces up to 22 sq ft.
Application
For on/off and floating point control of dampers in HVAC systems. Actuator sizing should be done in accordance with the
damper manufacturer’s specifications.
The actuator is mounted directly to a damper shaft up to 1.05"
in diameter by means of its universal clamp, 1/2” self-centered
default. A crankarm and several mounting brackets are available for applications where the actuator cannot be direct coupled to the damper shaft.
Operation
The actuator is not provided with and does not require any
limit switches, but is electronically protected against overload.
The anti-rotation strap supplied with the actuator will prevent
lateral movement.
The NMB series provides 95° of rotation and a visual indicator
indicates position of the actuator. When reaching the damper
or actuator end position, the actuator automatically stops.
The gears can be manually disengaged with a button on the
actuator cover.
The NMCB24-3… actuators use a sensorless Brushless DC
motor, which is controlled by an Application Specific
Integrated Circuit (ASIC). The ASIC monitors and controls
the actuator’s rotation and provides a digital rotation sensing
(DRS) function to prevent damage to the actuator in a stall
condition. Power consumption is reduced in holding mode.
Add on auxiliary switches or feedback potentiometers are
easily fastened directly onto the actuator body for signaling
and switching functions.
Dimensions
(All numbers in brackets are in millimeters.)
D121
O
M
L
©
O
A
H
B
r
r
o
u
t
s
o
h
M
l
e
s
C
s
D
5/16” to 1.05” [8 to 26]
2/5” to 1.05” [10 to 26]
2.36” [60]
3.15” [80]
0.98”
[25]
4.88” [124]
3.9” [99]
®
2.42” [61.4]
2” [50.8]
I20618 - Subject to change. © Belimo Aircontrols (USA), Inc.
NM
Wiring
NMCB24-3 (-T)
On/Off-Floating Point Control, Non-Spring Return, Direct Coupled, 24 V
NMCB24-3 - Typical Specification:
Floating point, on/off control damper actuators shall be electronic direct-coupled type, which require no crankarm and
linkage and be capable of direct mounting to a shaft up to
1.05” diameter. Actuators shall have Brushless DC motor
technology and be protected from overload at all angles of
rotation. Actuators shall have reversing switch and manual
override on the cover. Run time shall be constant and independent of torque. Actuators shall be cULus listed, have a 5year warranty, and be manufactured under ISO 9001
International Quality Control Standards. Actuators shall be
as manufactured by Belimo.
Accessories
K-NA Reversible Clamp
ZG-100 Universal Mounting Bracket
ZG-101 Universal Mounting Bracket
ZG-103 Universal Mounting Bracket
ZG-104 Universal Mounting Bracket
ZG-NMA Crankarm Adaptor Kit
AV8-25 Universal Shaft Extension
ZG-NMSA-1 Shaft Adaptor
ZS-T Terminal Cover for NEMA 2
ZS-100 Weather Shield - Steel
ZS-150 Weather Shield - Polycarbonate
Tool-06 8 mm & 10 mm Wrench
S1A, S2A Auxiliary Switch (es)
P370 Shaft Mount Auxiliary Switch
P…A Feedback Potentiometers
Note: When using NMCB24-3… actuators, only use acces-
sories listed on this page.
W263
W264
On/Off
Floating Point or On/Off control
®
161
24 V AC Transformer
1
Line
Volts
a open
a closed
3
2
a
Blk (1) Common
Red (2) +
Wht (3) +
The indication of direction
is valid for switch position 1.
10
–
24 V AC Transformer
1
2
Line
Volts
The indication of direction
3
Blk (1) Common
Red (2) +
Wht (3) +
10
–
is valid for switch position 1.
Notes:
Provide overload protection and disconnect as required.
1
Actuators may also be powered by 24 VDC.
2
Meets cULus requirements without the need of an
3
electrical ground connection.
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