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ML7284 NON-SPRING RETURN DIRECT COUPLED DAMPER ACTUATOR
SPECIFICATIONS
Models:
ML7284: Non-Spring Return Direct Coupled Damper Actuators.
ML7284A: High Torque (150 lb-in.) Direct Coupled Damper
Actuator without auxiliary switches or time-out function.
ML7284C: High Torque (150 lb-in.) Direct Coupled Damper
Actuator with two low voltage rated auxiliary switches
and without time-out function.
ML7284D: High Torque (150 lb-in.) Direct Coupled Damper
Actuator without auxiliary switches and with time-out
function.
ML7284F: High Torque (150 lb-in.) Direct Coupled Damper
Actuator with two low voltage auxiliary switches and
with time-out function.
Electrical Ratings:
Power Input: 24 Vac ± 20%, 50/60 Hz.
Power Consumption:
ML7284A-C: 6.0 VA at 24 Vac.
ML7284D,F: 6.5 VA at 24 Vac.
Auxiliary Switch Ratings: 24 Vac, 3 AFL, 18 ALR, 1A Pilot
Duty.
Cable Ratings:
Control: Standard models include nonplenum UL/CSA
rated, 30V, 60°C, 20 gauge cable.
Auxiliary Switch: UL/CSA rated 300V 90°C, 18 gauge.
Torque Ratings at Rated Voltages:
Lift and Hold Minimum: 150 lb-in. (17 N•m).
Breakaway Minimum: 150 lb-in. (17 N•m).
Stall Minimum: 150 lb-in. (17 N•m).
Stall Maximum: 250 lb-in. (28.3 N•m).
Torque Deratings at 24 ±20% Vac:
150 lb-in. from -20°F to 95°F (-29°C to +35°C).
133 lb-in. from 95°F to 140°F (35°C to 60°C).
150 lb-in. from -40°F to -20°F (-29°C to -34°C) at 24 Vac
+20% only.
Actuator Stroke:
95° Nominal ± 3°, mechanically limited.
Actuator Timing at 90° Stroke:
92 ± 2 seconds synchronous at 60 Hz from -4°F to 140°F.
110 ± 2 seconds synchronous at 50 Hz from -4°F to 140°F.
Non synchronous below -4°F.
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number, or specify:
1. Model number.
If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:
1. Your local Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Logistics
Honeywell Inc., 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386 (612) 951-1000
In Canada—Honeywell Limited/Honeywell Limitée, 155 Gordon Baker Road, North York, Ontario M2H 2C9. International Sales
and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan,
Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
63-2504—2
Ambient Temperature Range:
-40°F to +140°F (-40°C to +60°C).
Storage Temperature:
-30°F to 150°F (-40°C to 65°C).
Humidity:
5 to 95 percent relative humidity, noncondensing.
Mounting:
Mounts directly on 3/8 in. to 3/4 in. (12 to 19 mm) round or
square damper shaft. Minimum shaft length required:
• 2.5 in. (64 mm) when the shaft attachment is made on
the side of the actuator opposite the duct;
• 0.65 in. (16 mm) when the hub is mounted on the shaft
before the actuator is installed.
Most actuators are shipped with specifically sized hubs.
Some models contain an assembly with assorted hub inserts.
Mounting bracket is included with most models.
Dimensions:
See Fig. 1.
Device Weight:
3.0 lb (1.36 kg).
Noise Rating:
45 dBA maximum at 1 meter.
Position Indicator:
Mounted on actuator hub.
Actuator Design Life:
Full Stroke Cycles: 100,000.
Repositions:
2,000,000 minimum.
Control Input Specifications:
2 to 10 Vdc, 0 to 10 Vdc, or 4 to 20 mA.
Input Impedance:
100K ohms.
Feedback Signal:
2-10 Vdc.
2. Application.
2
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