Specifications

Control Valves - SMARTLINK
®
MRV
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combustion systems for industry
Maxon reserves the right to alter specifications and data without prior notice.
© 2014 Copyright Maxon Corporation. All rights reserved.
10-30.7-61
E-i -3/14
50120624-001/
10-Point System Commissioning
The SMARTLINK
®
MRV Control Interface is shipped with configuration settings that support a 10-point commissioning procedure
as described on the following page. Specifically, the Auto Ramp ON configuration is selected as the default setting so that fuel
valve adjustment is needed for only 10 position indexes (0, 1, 2…9). The 9 intermediate position indexes (0.5, 1.5, 2.5, etc.) are
automatically set to positions mid-way between the 10 integer position indexes, 0 through 9. In addition, the Default Startup
Configuration sets the standby, purge, and light-off positions to the same values as those established for Index 0 (minimum), Index
9 (maximum), and Index 0 (minimum), respectively. See Reference Table 11 for a detailed description of these configuration
settings.
When SMARTLINK
®
MRV is in the Position Setup Mode for commissioning, the ADJUST switch can be pushed to the MINIMUM
position (down). This action will immediately move the valves synchronously to position index #0, the minimum position. This
feature provides a method (during commissioning when the user’s temperature controller is not in automatic mode) to quickly ramp
the burner back to low fire if a process or combustion condition warrants an immediate burner firing rate change.
An optional User Display with a 4-line by 20 character LCD can also be used for SMARTLINK
®
MRV commissioning instead of
the Control Interface switches and lights. The commissioning procedure using the User Display is described on page 10-30.7-63.
See Reference Table 15 on page 10-30.7-85 for a description of User Display key operation and commands, as well as a
numbered menu structure.
19-Point System Commissioning
There are combustion applications that require burner adjustment at more than 10 points throughout the firing range to meet
emissions or fuel efficiency requirements. For these applications, the Auto Ramp configuration should be OFF, setting #0. With
Auto Ramp OFF, adjustment of each fuel valve at all 19 position indexes (0, 0.5, 1.0, 1.5…8.5, and 9) is now required and no
automatic “smoothing” is performed on points adjacent to the position index being adjusted. The procedure for adjusting all 19
points is identical to the 10-point procedure described above with the following exceptions:
1.) In step g of the 10-Point Commissioning (using the Control Interface) procedure on page 10-30.7-62, execute Command B-6 to
ensure the auto ramp function is OFF, setting #0. In step g of the 10-Point Commissioning (using the User Display), go to Main
Menu 9 (Set Configuration) and use the ARROW up key until the auto ramp configuration can be verified.
2.) In step h, the firing rate should be adjusted at 0.5-position index steps instead of every whole integer position index.
In some applications, it may also be desirable to adjust positions at all 19 points of the air valve(s) in order to provide a linear flow
characteristic. The same 19-point adjustment process used for the fuel valves would be performed for the air valve(s) instead of
the 2-point linear position setup using Commands A-5 and A-6 (described in steps c through e).
Custom Start-up Positions
The Custom Startup Configuration is intended for burners or applications that require standby, light-off, or purge positions that are
independent of the burner’s normal operating valve position curves.
To enable this function using the Control Interface, execute Command B-4, Select Startup Configuration. Use the INC/DEC
switch to select setting #1 (Custom Startup) and press the ENTER switch to save the configuration setting if it has been changed.
Command B-1 (Set Purge Positions), Command B-2 (Set Standby Positions), and Command B-5 (Set Light-Off Positions) can now
be executed to set custom valve positions during startup. See Reference Table 13 for a more detailed explanation of how to use
these commands.
These custom startup adjustment commands can also be executed from the User Display using Main Menu 9 to select the
Startup Configuration item (using the ARROW keys) and Sub-Menu 9.1 to change (ARROW keys) and save (ENTER key) the
setting. See Reference Table 15 (page 10-30.7-85) for the User Display command menu structure.