Submittal Sheet

SPECIFICATION DATA
63-1257-02
ML6425, ML7425 Spring Return
Electric Linear Valve Actuators
DIN EN
ISO 9001
®
The ML6425 and ML7425 Spring Return Electric Linear Valve
Actuators provide floating or modulating control to operate
standard Honeywell valves in heating, ventilating, and air
conditioning (HVAC) applications. The modulating actuators
accept an analog signal of 0 to 10 Vdc or 2 to 10 Vdc, and an
internal selector plug can be used to reverse the direction of
action.
FEATURES
• Accurate valve positioning.
• Quick and easy installation.
• No separate linkage or adjustments required.
• Conduit connector is standard.
• True spring return on power failure.
• Low power consumption.
• High close-off ratings.
• Force-limiting end switches.
• Direct/reverse action.
• Synchronous motor.
• Maintenance-free, corrosion-resistant design.
• Position feedback signal with ML7425.
• Fail-safe position selection for control signal loss with
ML7425.
SPECIFICATIONS
Models:
Dimensions:
 See Fig. 1.
Weight:
 5.1 lb (2.3 kg).
Electrical Ratings:
 Power Input: 24 Vac ±15%, 60 Hz.
 Power Consumption:
ML6425: 11 VA maximum at 24 Vac.
ML7425: 12 VA maximum at 24 Vac.
 Signal Source Output Resistance: 1 kOhm maximum.
 Signal Load: 1 mA maximum.
Signal Inputs (Supply Voltage Between Terminals):
 ML6425:
B and 24 Vac: Drives valve stem down.
W and 24 Vac: Draws valve stem up.
 ML7425: 0 to 10 Vdc or 2 to 10 Vdc.
Stem Force:
 135 lbf (600N).
Actuator Stroke:
 3/4 in. (20 mm).
Actuator Run Time at 60 Hz:
 90 seconds.
Spring Return Time:
 12 seconds.
Temperature Ranges:
 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.
Model Spring Return Action Description
ML6425A Drives valve stem down on power
failure
Electric
Linear Valve
Actuator
ML7425A
ML6425B Draws valve stem up on power
failure
ML7425B
Close-off Pressure Ratings:
 See Table 1.
Protection Standard:
 IP54.
Approvals:
 Underwriter’s Laboratories, Inc. UL94-5V Flame Retardant.
 Meets CE requirements.
Cable entry:
 Conduit connector and one knockout on case.
Actuator Material:
 Cover: ABS-FR plastic.
 Base: PBTP-FR plastic.
 Yoke: Diecast aluminum.
Accessories:
 43196000-001 High Temperature Kit (for actuators with 3/4
in. stroke). Increases the maximum temperature to 428°F
(220°C).
 43196000-102 High Temperature Kit (for actuators with 1-
1/2 in. stroke). Increases the maximum temperature to
428°F (220°C).
 43191679-111 Single Auxiliary Potentiometer (10K ohm).
 43191679-112 Single Auxiliary Potentiometer (220 ohm).
 43191680-102 Dual Auxiliary Switch (24 Vac use only).
ML6420/ML6425 Only
 43191679-101 Single Auxiliary Potentiometer.
 43191679-102 Single Auxiliary Potentiometer.
 43191679-103 Dual Auxiliary Potentiometer.
 43191679-104 Dual Auxiliary Potentiometer.
 43191680-105 Dual Auxiliary Switch (24 Vac use only).
ML7420/ML7425 Only
 43191680-205 Dual Auxiliary Switch (24 Vac use only).