Specifications

Control Valves - SMARTLINK
®
MRV
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combustion systems for industry
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10-30.7-68
E - i - 3/14
50120624-001/
Actuator Removal
1. Power down the SMARTLINK
®
MRV system. Turn off the fuel supply and burner management system.
2. Remove the actuator access cover using a 4 mm Allen wrench and verify the green power light is OFF.
3. Record the wire color code sequence and then disconnect the four wires and shield from the terminal block. Disconnect any conduit fittings.
4. Loosen the clamp collar screws with a 3/16” Allen wrench.
5. Remove the four M6x1x18 mm screws connecting the actuator to the adapter with a 5 mm Allen wrench.
6. Remove the actuator by holding the actuator housing and pulling the actuator away from the valve.
Actuator Reinstallation
1. Inspect the actuator coupling. Identify the type of key required based on the photos below.
2. Verify the clamp collar is loose and position the screw head on the left when looking at the clamp collar at the top.
3. Place the actuator shaft with key into the clamp collar. Slide the keyed shaft into the coupling key slot, then rotate the actuator housing so
the alignment pin mates with the pin hole in the valve adapter. The parts are a clearance fit but should slip together with little force. Apply
pressure until the actuator is flat against the adapter. Do not apply an excessive force. If the sub-assemblies do not mate together, recheck
that the clamp is loose and the key is pressed to the bottom of the key slot.
4. Verify that the valve will close completely. With the valve closed, the coupling hard-stop pin should be centered and touching the hard-stop
set screw for butterfly valves. For ball valves, the coupling should hit on the two vertical hardstop pins in the bracket.
5. With valve in the fully closed position, assemble the actuator to the valve adapter with four M6x1x18 mm fasteners using Loctite 242. Use a
torque wrench with a 5 mm Allen bit to apply 18 in-lbs of torque in an alternating diagonal tightening sequence.
6. With the valve in the fully closed position, verify that the clamp collar is seated flush against the coupling shoulder. Tighten the stainless
steel clamp collar with a torque wrench and 3/16” Allen bit to 170 in-lbs .
7. Make the necessary water-tight electrical conduit connection. Re-connect the four wires to the terminal strip per the original color code
sequence. Re-connect the shield wire to the terminal strip, keeping it less than 1” in length.
8. Apply power to the SMARTLINK
®
MRV System. Verify the green power light is ON.
9. Reinstall the access cover and torque the four fasteners to 18 in-lbs using a 4 mm Allen wrench.
10. Make sure the system is in Shutdown Mode (i.e. The Control Interface RUN and MANUAL lights are off and ALARM light is on.) If not,
disconnect power for 10 seconds to the valve actuator being replaced and re-power the actuator after the system enters Shutdown Mode.
11. With the Control Interface, select the valve number that is being replaced (Command A-3). Next, execute Command A-4, Commission Valve.
This command electronically "replaces" the spare unit (valve #4) as the valve requiring replacement (valve #0, 1, 2 or 3). If a User Display is
used, select the valve to be replaced and execute the "Replace" command (Sub-Menu #11.5) under the Valve Maintenance Main Menu #11.
12. Execute Command C-1, Enable Calibration, from the Control Interface or the User Display. If all the numbered lights flash on the Control
Interface after command entry, the command was not successfully executed. Refer to Table 14 (page 10-30.7-84) for detailed command
information. In the User Display, this command is available under the Valve Maintenance Menu in the Test Mode Sub-Menu (#11.1).
Successful completion of this command will result in the test mode being displayed as "ON".
13. Execute Command C-2, Calibrate Valve. This command takes approximately 3 minutes. If the command is executed from the Control
Interface, the even numbered lights will flash on and off. If the command is executed from the User Display (Sub-Menu #11.4), the valve
positions displayed will slowly change as the valve moves through its full travel. Refer to Table 14 for detailed command information. If the
command is executed from the Control Interface and all the lights flash on and then off, the calibration procedure did not execute properly.
14. Power the complete system down and then up. If a valve calibration alarm still exists, the calibration command did not complete successfully.
Verify that the actuator was mounted properly as described above and perform the previous steps again.
15. Turn on the fuel supply and burner management system and re-verify burner performance throughout its full firing range. The valve attached to
the new actuator will be within approximately 1 degree of its previously commissioned positions due to mechanical tolerances. Verify burner
operation with the new actuator through its entire firing range and re-commission.
Actuator replacement should be accomplished by MAXON-trained personnel only.
Blind keyway requires 1/8” x 1/8” square key Open keyway requires 1/8” x 3/16” rectangular key
Blind keyway
Open keyway