Honeywell FAST-ACTING User Manual
For fire/smoke control applications, Application, Applicable literature
ML4202, ML4302, ML4702, ML4802,
ML8202, ML8302 Fast-Acting,
FOR FIRE/SMOKE CONTROL APPLICATIONS
The ML4202, ML4302, ML4702, ML4802, ML8202, ML8302
Fast-Acting, Two-Position Actuators are spring return direct
coupled actuators (DCA) with an integral junction box for
on/off damper control. The actuator accepts an on/off signal from
a single-pole, single-throw (spst) controller. Models are available
with clockwise (cw) or counterclockwise (ccw) spring return.
— Motor/Actuator Selection Guide
for Damper Applications
— Engineering Manual of Automatic Control
(also called The Gray Manual)
— Direct Coupled Actuator
Quick Selection Guide
— Damper Torque Calculator
The actuator is designed to meet UL555S standards
at 350°F (176°C). The actuator must be tested with
the damper to achieve this rating.
Models: See Table 1.
Dimensions: See Fig. 1.
Minimum Damper Shaft Length: 1-3/4 in. (45 mm).
Device Weight: 5 lb (2.3 kg).
Stroke: 95° ± 3°, mechanically limited.
Electrical Ratings: See Table 1.
Two color coded 16 in. leads; includes ground screw.
One 7/8 in. hole for conduit connections (fittings not included).
Mounting: 3/8 to 1/2 in. square or round damper shafts.
Actuator can be mounted with shaft in any position. Secure
hub to shaft with: Two 1/4-28 UNF set screws. Use 1/8 in.
Allen wrench to tighten set screws.
Honeywell does not recommend using linkages with
these actuators because side-loading of the output
hub reduces actuator life.
Operating Temperature: 0 to 130°F (-18 to 55°C).
Shipping/Storage Temperature: -40 to 140°F (-40 to 60°C).
Humidity: 5% to 95% rh, noncondensing.
Torque Rating (at rated voltage):
Typical Holding: 100 lb-in. (11.3 N•m).
Stall Maximum: 150 lb-in. (17 N•m).
Spring Return: 20 lb-in. (2.2 N•m).
350°F Driving: 20 lb-in. (2.2 N•m).
Design Life (at Rated Voltage): 60,000 full stroke cycles.
Noise Rating (Maximum):
Driving Open: 65 dBA at 1m.
Holding: 20 dBA at 1m (no audible noise).
Table 1. Models.
Prolonged holding-period (1 year) testing of these actuators
has been performed with no spring return failures. The
actuator and the internal spring are designed to require no
special cycling during long-term holding.
Honeywell recommends following all local, state and national
codes for periodic testing of the entire smoke control
system. Refer to National Fire Protection Association
(NFPA) National Fire Codes®: NFPA90A, NFPA92A and
NFPA92B for your application.
NFPA recommends periodic examination of each fire/smoke
damper (semi-annually or annually) to ensure proper
Timing (At Rated Torque and Voltage):
ML4202, ML4302, ML4702, ML4802: 25 sec maximum,
18 sec typical.
ML8202, ML8302: 25 sec maximum, 22 sec typical.
Spring Close: 15 sec.
Environmental Protection Ratings: NEMA1.
Approvals: See Table 2.
0.18A, 18W 0.11A, 9W
0.13A, 18W 0.10A, 11W 230 ±10%,
24 +20%, -10%