Technical Specifications & Performance Parameters:
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Model: M9494F1003 (Also listed as M9494F1003/U)
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Type: Proportional Modutrol Motor (Non-Spring Return)
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Torque Rating: 300 lb-in (34 Nm) running torque; Breakaway Torque: 600 lb-in (68.0 Nm)
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Power Supply: 24 V AC, 50/60 Hz
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Power Consumption: 15 W
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Input Signal: 135 Ohm proportional (three-wire system)
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Stroke Time: 60 seconds (90° stroke), 107 seconds (160° stroke)
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Stroke Adjustability: Field adjustable 90° to 160° (symmetrical), factory set typically at 90° or 160°
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Output Shaft: Double-ended, 3/8 in (9.5 mm) square
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Auxiliary Switches: 2 integral SPST switches (configurable for cams)
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Operating Temperature: -40 °F to +150 °F (-40 °C to +66 °C)
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Enclosure: NEMA 1 (general purpose), Insulation Class B
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Dimensions: 6.45 in H x 5.5 in W x 7.3 in D (164 x 140 x 185 mm)
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Weight: 4.40 lbs (2 kg)
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Deadweight Load on Shaft: 200 lb per end (300 lb combined)
Material Composition & Structure:
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Housing: Die-cast metal or molded composite (NEMA 1 rated)
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Gear Train: High-strength engineered plastic/metal hybrid gears with lubrication
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Shaft: Steel, square profile
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Electronics: Vibration-resistant drive circuit potted or secured against industrial vibration
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Switch Cams: Adjustable plastic cams on shaft for auxiliary switch actuation
Functional Features & Working Principle:
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Working Principle: Receives a varying resistance (135 ohm) or voltage signal from a controller; an internal feedback potentiometer compares commanded position vs actual shaft position, driving the motor forward/reverse via the AC synchronous motor and gear train until positions match.
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Precision Firing Control: Proportional response ensures smooth modulation of fuel/air valves to maintain combustion efficiency and reduce emissions.
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Vibration-Resistant Electronics: Designed to withstand pump/fan vibrations in boiler rooms without premature failure.
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Field Adjustable Stroke: Mechanical stops and cams allow customization of rotation range to match valve/damper travel requirements.
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High Breakaway Torque: Overcomes static friction from stiff valves or debris accumulation during startup.
Application Scenarios:
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Commercial/industrial gas or oil burner firing rate control
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HVAC damper modulation in air handling units
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Boiler systems (hot water, steam) requiring modulated fuel input
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Incinerators and thermal oxidizers
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Any application requiring proportional modulation of a mechanical linkage up to 300 lb-in torque
Installation Requirements & Usage Notes:
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Mount in any orientation but avoid excessive heat directly on the motor housing; keep away from open flame impingement.
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Shaft must be coupled to the valve/damper with a flexible linkage or direct coupling that does not impose side loads exceeding specs.
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Adjust auxiliary switches before final installation to ensure they trip at correct positions (e.g., low fire cutoff, high fire alarm).
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Verify 24 V AC supply is derived from a suitable transformer; do not share heavily inductive loads on same circuit without isolation.
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During initial power-up, test manual override (if available) or observe stroke to ensure it does not hit mechanical limits of the driven device.
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Periodically inspect for looseness due to vibration; high breakaway torque can mask a seized linkage until failure occurs.
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