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ML6420, ML7420
Non-Spring Return
Electric Linear Valve Actuators
APPLICATION
The ML6420 Non-Spring Return Electric Linear Valve
Actuators are floating control actuators used with controllers
that provide a switched or floating single-pole double-throw
(spdt) output. These actuators operate standard Honeywell
valves in heating, ventilating, and air conditioning (HVAC)
applications.
The ML7420 Non-Spring Return Electric Linear Valve
Actuators are modulating control actuators used with
controllers that provide an analog output of 0 to 10 Vdc or 2 to
10 Vdc. These actuators operate standard Honeywell valves
in HVAC applications. An internal selector plug can be used to
reverse the direction of action.
FEATURES
• Quick and easy installation.
• No separate linkage required.
• Conduit connector is standard.
• No adjustments required.
• Low power consumption.
• High close-off ratings.
• Force-limiting end switches.
• Manual operator.
• Synchronous motor.
• Corrosion resistant design.
• Maintenance free.
• Direct/reverse acting with ML7420.
• Position feedback signal included with ML7420.
• Selectable 0 to 10 Vdc or 2 to 10 Vdc signal input with
ML7420.
Application ........................................................................
Installation ........................................................................
Ordering Information ........................................................
Operation ..........................................................................
Checkout ..........................................................................
PRODUCT DATA
Contents
1
3
2
7
8
63-2533-03
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Related Manuals for Honeywell ML6420
Summary of Contents for Honeywell ML6420
- Page 1 • Corrosion resistant design. APPLICATION • Maintenance free. • Direct/reverse acting with ML7420. The ML6420 Non-Spring Return Electric Linear Valve Actuators are floating control actuators used with controllers • Position feedback signal included with ML7420. that provide a switched or floating single-pole double-throw (spdt) output.
- Page 2 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 Honeywell Automation and Control Products Sales Office (check white pages of your phone directory). 2. Honeywell Customer Care...
- Page 3 ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS Table 1. Close-off ratings for ML6420, ML7420 Electric Linear Valve Actuators and Honeywell Valves (psi). Type Valve 1/2 in. 3/4 in. 1 in. 1-1/4 in. 1-1/2 in. 2 in. 2-1/2 in. 3 in.
- Page 4 ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS All wiring must comply with local electrical codes, ordinances and regulations. Voltage and frequency of the transformer used with the actuator must correspond with the power supply and actuator characteristics. See Fig. 6 through 11 for typical wiring hookups.
- Page 5 ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS ML7420 WIRING ML7420 STRIP SENSOR WIRING INPUT STRIP (FEEDBACK) OUTPUT – – (HOT) – DUAL TRANSFORMERS 500 OHM RESISTOR T775 (HOT) (WITH 4-20 MA OUTPUT) POWER SUPPLY. PROVIDE DISCONNECT MEANS AND (HOT) OVERLOAD PROTECTION AS REQUIRED.
- Page 6 ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS M17428 Fig. 13. Replacing actuator cover. 63-2533—03...
- Page 7 Using the potentiometer, the actuator can be set to run to any operator knob (see Fig. 14) to open or close the valve in the position in event of a signal failure (ML7420/25 only). ML6420 event of power failure: does not have any input signal failure jumpers or 1.
- Page 8 ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS Direction of Action (ML7420/25 only) The direction of the actuator action can be changed using the ML7420 pushbutton and LED, which is factory set so that the actuator WIRING STRIP drives the valve stem down on increasing signal and draws INPUT the valve stem up on decreasing signal.