The Modutrol IV ™ Series 90 engine is used to operate the damper or valve. The motor accepts a current or voltage signal from the electronic control unit to position the damper or valve at any point between opening and closing.

• Engines are designed for normally open or normally closed valves and damper valves.
• Shaft payload: 200 lb (91 kg) on motor, up to 300 lb (136 kg)
• . Operating Temperature: -40 to 150°F (-40 to 66°C).
• Shaft size: 3/8 in. (9.5 mm) square.
• Standard setting time is 30 seconds (90° stroke) and 60 seconds (160° stroke).
• Other times available Replaces M934A, D, M941, M944A, C, D, M945A, D, F, M954, M965 and M975 engines