Honeywell ML7421 - Manual

SPECIFICATION DATA
63-1256-02
Non-Spring Return Electric Linear Valve
Actuators
ML6420, ML7420
ML6421, ML7421
The ML6420, ML7420, ML6421, and ML7421 Non-Spring
Return Electric Linear Valve Actuators provide single-pole
double-throw (spdt), Series 60 two-position and floating or
modulating control to operate standard Honeywell valves in
heating, ventilating, and air conditioning (HVAC) applications.
The modulating actuators accept an analog output 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
• Quick and easy installation.
• No separate linkage or adjustments required.
• High close-off ratings.
• Force-limiting end switches.
• Synchronous motor.
• Maintenance-free, corrosion-resistant design.
• Manual operator.
• Conduit connector standard on ML6420, ML7420
• Conduit knockout standard on ML6421, ML7421.
• Accurate valve positioning.
• Low power consumption.
• Direct/reverse acting with ML7420, ML7421.
• Position feedback signal with ML7420, ML7421.
SPECIFICATIONS
Models:
a Dependant on actuator model.
Dimensions: See Fig. 1.
Weight:
 ML6420, ML7420: 2.9 lb (1.3 kg).
 ML6421, ML7421: 5.1 lb (2.3 kg).
Electrical Ratings:
 Power Input: 24 Vac (+10%, -15%), 60 Hz.
 Power Consumption (at 24 Vac):
 ML6420: 6 VA maximum.
 ML7420: 7 VA maximum.
 ML6421: 11 VA maximum.
 ML7421: 12 VA maximum.
Signal Inputs:
 ML6420, ML6421:
 24 Vac across T1 and W: Drives stem downward.
 24 Vac across T2 and B: Draws stem upward.
 ML7420, ML7421: 0 to 10 Vdc or 2 to 10 Vdc.
Ambient Ratings:
 Temperature:
 Ambient Range: 14°F to 122°F (-10°C to +50°C).
 Storage Range: -40°F to +158°F (-40°C to +70°C).
 Humidity: 5 to 95 percent relative humidity, noncondensing.
Cable Entry:
 ML6420, ML7420: Conduit connector and one case
knockout for 1/2 in. conduit.
 ML6421, ML7421: Two case knockouts for 1/2 in. conduit.
Protection Standard:
 IP54.
Close-off Pressure Ratings: See Table 1.
Model
Run Time
at 60 Hz
Stem Force
in lbf (N)
Stroke in
in. (mm) Description
ML6420A 60 sec or
30 sec a
135 (600) 3/4 (20) Electric
Linear Valve
Actuator
ML7420A
ML6421A 95 sec
405 (1800)
ML7421A
ML6421B 175 sec
1-1/2 (38)
ML7421B
Actuator Material:
 Cover:
 ML6420, ML7420: ABS-FR plastic.
 ML6421, ML7421: ABS plastic.
 Base:
 ML6420, ML7420: PBTP-FR plastic.
 ML6421, ML7421: Diecast aluminum.
 Yoke: Diecast aluminum.
Approvals:
 Underwriter’s Laboratories, Inc. Component Recognized.
 Meets UL94-5V plenum requirements.
 Canadian Standards Association Listed.
 Meets CE requirements.
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).