Belimo Electronic Fail Safe Actuator - GKX24-MFT-T-N4
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Item #: GKX24-MFT-T-N4

For proportional modulation of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer?s specifi cations.

The actuator is mounted directly to a damper shaft up to 1.05? in diameter by a universal clamp.

The default parameters for 2 to 10 VDC applications of the GKX24-MFT-T N4 actuator are assigned during manufacturing. If necessary, custom versions of the actuators can be ordered. The parameters can be changed by: pre-set or custom confi gurations provided by Belimo or on-site using the PC-Tool software.

The actuator is electronically protected against overload. The anti-rotation strap supplied with the actuator will prevent lateral movement.

The GKX24-MFT-T N4 provides 95ø of rotation and a visual indicator shows the position of the actuator. When reaching the damper or actuator end position, the actuator automatically stops. The gears can be manually disengaged by pressing the button located on the actuator cover.

The GKX24-MFT-T N4 actuator uses a brushless DC motor, which is controlled by an Application Specifi c Integrated Circuit (ASIC). The ASIC monitors and controls the actuator?s rotation and provides a digital rotation sensing (DRS) function to prevent damage to the actuator in a stall condition. Power consumption is reduced in holding mode.

Specifications:

• Power supply
  • 24 VAC ñ 20% 50/60 Hz
  • 24 VDC ñ 10%
• Power consumption 12 W (3 W)
• Transformer sizing
  • 21 VA (Class 2 power source)
• Electrical connection
  • Screw terminal (for 26 to 14 GA wire)
  • 1/2" conduit connector
• Overload protection electronic throughout 0 to 95ø rotation
• Operating range Y
  • 2 to 10 VDC, 4 to 20 mA (default)
  • Variable (VDC, fl oating point, on/off)
• Input impedance 100k
• Feedback output U 2 to 10 VDC, 0.5 mA max, VDC variable
• Angle Of Rotation max. 95ø, adjustable with mechanical stop electronically variable
• Torque 360 in-lb [40 Nm]
• Direction Of Rotation reversible with switch
• Position indication dial
• Running time
  • 150 seconds (default) variable (90 to 350 seconds)
  • Fail-safe 35 seconds
• Humidity 5 to 100% RH (UL Type 4)
• Ambient temperature -22øF to 122øF [-30øC to 50øC]
• Storage temperature -40øF to 176øF [-40øC to 80øC]
• Housing UL Type 4, NEMA 4, IP66
• Housing material Polycarbonate
• Agency listings? cULus acc. to UL 60730-1A/-2-14, CAN/CSA E60730-1, CSA C22.2 No. 24-93, CE acc. to 89/336/EEC
• Noise level
  • < 45dB(A)
• Servicing maintenance free
• Quality standard ISO 9001
• Weight 10.4 lbs [4.71 kg]

Additional Information:
- Technical Data Sheet (pdf)