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0-10 Vdc Actuator-150 lb-in, Non-Spr Ret


0-10 Vdc Actuator-150 lb-in, Non-Spr Ret

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Honeywell ML7284 non-spring return direct coupled damper actuators provide portioning damper control in HVAC applications. It uses a current or voltage signal from an electronic controller to position a damper at any point between fully open/closed.


  • Mounts on 3/8- to 5/8-in. round and square and 3/4-in. round damper shafts with appropriate 1/2-in. insert
  • Features 150 lb-in. (17Nm) torque and magnetic coupling eliminates mechanical stops or limit switch adjustments by limiting stall torque to 250 lb-in. (283Nm) maximum
  • Ninety-five degree stroke provides compression of rubber/neoprene gaskets for 90 low leakage dampers
  • Manual clutch allows for manual adjustment
  • Ninety-two second synchronous timing eliminates feedback position indication in closed-look temperature control applications
  • Removable splined output hub offers installation flexibility with premounting of hub on damper shaft
  • Available with or without time-out feature
  • Models available with 0 to 10 Vdc, 2 to 10 Vdc and 4 to 20 mA inputs; also available with 2 to 10 Vdc feedback signal

Product Specifications

Dimensions (in.)
8.46 in high x 4.01 in wide x 3.15 in deep
Dimensions (mm)
215 mm high x 102 mm wide x 80 mm deep
Mounting bracket, hub insert for 16mm square/round shaft
Weight (lb)
5.4 lb
Weight (kg)
2.45 kg
Plenum rated plastic housing
Integral 1/2 in. conduit connection.
Direct Coupled
50 Hz; 60 Hz
Approvals, Underwriters Laboratories Inc.
UL873, Plenum Rated
Customer Special
Electrical Connections
20 AWG color-coded cable
Operating Humidity Range (% RH)
5 to 95% RH, non-condensing
Supply Voltage
24 Vac ±20%
Power Consumption
Driving-- 6 VA
Shipping and Storage Temperature Range (F)
-30 F to +150 F
Shipping and Storage Temperature Range (C)
-35 C to +65 C
Approvals, Canadian Underwriters Laboratories Inc.
cUL C22.2 No. 24-93
Ambient Temperature Range (F)
-40 F to +140 F
Ambient Temperature Range (C)
-40 C to +60 C
Environmental, Electrical or Ingress Protection Rating
Internal Auxiliary Switch
Maximum Noise Rating
Driving (dB(A) @ 1m)-- 45
95 ±3 degrees
Shaft Dimensions (in.)
3/8 to 3/4 in. round or 3/8 to 5/8 in. square
Actuator Type
Control Signal
0 to 10 Vdc
Fail Safe Mode
Non-Spring Return
Torque Rating (lb-in.)
150 lb-in.
Torque Rating (Nm)
17 Nm
Additional Torque Ratings (lb-in.)
Maximum Stall-- 270 lb-in.
Additional Torque Ratings (Nm)
Maximum Stall-- 30 Nm
External Auxiliary Switches Available
Rotation to Open
By switch
Timing, Nominal
Driving @ 60 Hz-- 92 sec ±2
0-10 Vdc
Shaft Adapter Type
Fixed size Hub, two set screws
Manual operation
Declutch mechanism
Shaft Dimensions (mm)
10 to 19 mm round or 10 to 16 mm square
Input Impedance
100K ohm
Electrical Connections (in.)
36 in.
Electrical Connections (mm)
0.9 m