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PRODUCT DATA

63-2533-03

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.

Contents

Application ........................................................................

1

Installation ........................................................................

3

Ordering Information  ........................................................

2

Operation ..........................................................................

7

Checkout ..........................................................................

8

Содержание ML6420

Страница 1: ...rollers 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 swit...

Страница 2: ...t 24 Vac ML7420 7 VA maximum at 24 Vac Signal Source Output Resistance 1K ohm maximum Signal Load 1 mA maximum Ambient Ratings Temperature Ambient 14 F to 122 F 10 C to 50 C Storage 40 F to 158 F 40 C to 70 C Maximum Valve Medium 300 F 150 C Humidity 5 to 95 percent relative humidity noncondensing Stem Force 135 lbf 600N Signal Inputs Supply Voltage Between Terminals ML6420 B and 24 Vac Drives val...

Страница 3: ...ge actuator due to condensation or a valve gland leak Install the actuator in a position above horizontal Mounting 1 Place the actuator on the valve with the U bolt around the valve collar See Fig 2 2 Place the U bolt against the valve collar and secure the actuator to the valve by turning each U bolt nut clock wise NOTE To assure even pressure on the collar first tighten the nuts finger tight and...

Страница 4: ...ng the wiring diagram in Fig 6 connect power and control wires Make sure that all wiring is correct 3 For ML7420 only Check the selector plugs for proper settings See Signal Input Failure section for details 4 When wiring is complete replace the actuator cover See Fig 7 5 Apply power and control signals to the actuator Fig 5 Connecting power and control wiring Fig 6 ML6420 wiring M6632 M6633 M1742...

Страница 5: ... O1 O2 1 3 2 INPUT FEEDBACK OUTPUT 3 2 1 L1 HOT L2 M17422 L1 HOT L2 1 1 WIRING STRIP F T2 T1 O1 O2 1 1 2 2 3 3 4 5 6 L1 HOT L2 1 ML7420 T775 WITH 2 10 VDC OUTPUT DUAL TRANSFORMERS POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M17423 SENSOR L1 HOT L2 1 1 WIRING STRIP F T2 T1 O1 O2 1 1 2 2 3 3 4 5 6 ML7420 T775 WITH 2 10 VDC OUTPUT SINGLE TRANSFORMER 40 VA 24 VAC POWER SU...

Страница 6: ...ML6420 ML7420 NON SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS 63 2533 03 6 Fig 13 Replacing actuator cover M17428 ...

Страница 7: ...and stop the motor After a manual valve close off operation release the spindle one turn by turning the manual operator knob This will ensure automatic disengagement of the manual operator upon power resumption NOTE If the manual operator knob is not pushed in while turned it will rotate only a short distance before disengaging without power resumption Fig 14 Manual operator knob ML7420 Signal Inp...

Страница 8: ... 24 Vac is correctly applied to the actuator 3 Apply the power to the appropriate leadwires to move the valve 4 If the actuator does not move make sure the actuator is properly installed wired 5 If the actuator installation and wiring are both correct and the actuator does not run replace the actuator Controller Checkout 1 Adjust the setpoint of the controller to call for opening the valve Observe...

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