Honeywell ML6425, ML7425 User Manual
63-2516-07
ML6425, ML7425 Spring Return
Electric Linear Valve Actuators
PRODUCT DATA
FEATURES
ML6425 and ML7425
• Accurate valve positioning.
• Quick and easy installation.
• No separate linkage required.
• On power failure:
ML6425A and ML7425A drive valve stem down.
ML6425B and ML7425B draw valve stem up.
• Conduit connector is standard.
• No adjustments required.
• True spring return on power failure.
• Low power consumption.
• High close-off ratings.
• Force-limiting end switches.
APPLICATION
The ML6425 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 ML7425 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 heating,
ventilating, and air conditioning (HVAC) applications. An
internal selector plug can be used to reverse the direction of
action.
• Direct/reverse action.
• Synchronous motor.
• Corrosion resistant design.
• Maintenance free.
ML7425
• Position Feedback signal.
• Fail-safe position selection for control signal loss.
Contents
Application ........................................................................ 1
Specifications ................................................................... 2
Ordering Information ........................................................ 2
Installation ........................................................................ 3
WIring ............................................................................... 4
Operation .......................................................................... 7
Checkout .......................................................................... 8
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS
SPECIFICATIONS
Models:
Model Spring Return Action Description
ML6425A Drive valve stem down on power
ML7425A
ML6425B Draw valve stem up on power
ML7425B
Dimensions: Refer to 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: Drive valve stem down.
W and 24 Vac: Draw valve stem up.
ML7425: 0 to 10 Vdc or 2 to 10 Vdc.
Stem Force: 135 lbf (600 N).
Actuator Stroke: 3/4 in. (19 mm).
Actuator Run Time at 60 Hz: 90 seconds.
Spring Return Time: 12 seconds.
Temperature Ranges:
Ambient: 14° to 122° F (-10° to +50° C).
failure
failure
Electric
Linear Valve
Actuator
Storage: -40° to +158° F (-40° to +70° C).
Maximum Valve Medium: 300° F (149° C).
Humidity: 5 to 95 percent relative humidity, noncondensing.
Close-off Pressure Ratings: Refer to 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).
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number.
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
1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
3. http://customer.honeywell.com or http://customer.honeywell.ca
International Sales and Service Offices in all principal cities of the world. Manufacturing in Belgium, Canada, China, Czech
Republic, Germany, Hungary, Italy, Mexico, Netherlands, United Kingdom, and United States.
63-2516—07 2
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS
CAUTION
CAUTION
CAUTION
Table 1. Close-off Ratings for ML6425, ML7425 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.
FlangeV5011A ——————2816
V3350/ 3351/ 3450/ 3451 — —————2114
V5013B, C; V3360/ 3361/ 3460/ 3461 — —————
NPT V5011F, G
150
a
21
b
150
b
150
b
134
b
77 49 28 16
14
a
V5011H, J 150 150 150 145 — — — —
V5011N1xxx, V5011N3xxx, V5013N 230 230 163 104 67 37 — —
V5011N2xxx 100 100 100 100 67 37 — —
V5013F 150 150 150 126 77 49 — —
a
Represents maximum pressure difference between the outlet and either of the two inlets.
b
Do not exceed 100 psi with V5011G valves used in steam applications.
Location
5-5/15
(135)
2-11/16 (67)
6-5/16
x
(161)
14-5/16 (364)
MINIMUM
CLEARANCE
11-1/4
(284)
Install the actuator in a location that allows enough clearance
for mounting accessories and for servicing.
Equipment Damage Hazard.
Can damage actuator due to condensation or a
valve gland leak.
Install the actuator in a position above horizontal.
1/2 (13) FPT
7-5/8
(192)
YOKE
DIAMETER
1-3/8 (35)
M7892A
Fig. 1. Approximate Dimensions of ML6425, ML7425
Electric Linear Valve Actuator in in. (mm).
INSTALLATION
When Installing this Product...
1. Read instructions carefully. Failure to follow them could
damage the product or cause a hazardous condition.
2. Check ratings and description given in the specifications
to make sure the product is suitable for your application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment circuitry.
Disconnect power supply before installation.
Mounting
1. Place the actuator on the valve with the U-bolt around
the valve collar (Refer to Fig. 2).
2. Place the U-bolt against the valve collar and secure the
actuator to the valve by turning each U-bolt nut
clockwise. To assure even pressure on the collar, first
tighten the nuts finger-tight and then alternate turning
each U-bolt nut until both are snug.
3. Push aside the stem button retaining clip and hold
(Refer to Fig. 3).
4. Lift valve stem until the head of the valve stem button is
inside the large slot of the stem button retaining clip on
the actuator.
5. Release the stem button retaining clip to secure the stem
button. Check to make certain the stem button is secured
by the retaining clip.
6. Remove the cover from the actuator using a Phillips or
crosspoint screwdriver (Refer to Fig. 4).
Personal Injury Hazard.
Manual spring handle under tension can turn
quickly when lifted, pinching fingers between
handle and plastic casing.
Use a screwdriver to lift and release manual spring
handle (Refer to Fig. 5).
7. Remove the manual spring handle retaining clip, and lift
and release the handle (Refer to Fig. 5). The easiest way
to perform this operation safely is to:
a. Remove the retaining clip.
b. Wedge a small, flat-bladed screwdriver under the
manual spring handle and pry up the handle
(Refer to Fig. 5).
3 63-2516—07
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