Specifications

Control Valves - SMARTLINK

MRV

www.maxoncorp.com

combustion systems for industry

Maxon reserves the right to alter specifications and data without prior notice.

10-30.7-65

E-i -3/14

50120624-001/

Manual Operation

Command A-0, Enter Manual Positioning Mode, is used to override the 4-20 mA position command input and the startup (burner

management) command inputs (i.e. Purge Position, Lightoff Position, Standby Position). This command is used during the

operational checkout of the system prior to commissioning and after commissioning to verify burner performance at each position

index.

Power Loss with Large Valves (>12”)

Do not remove power from an air valve actuator when both 1) the valve is open more than 30 degrees, and 2) the blower is running.

Prior to power loss, ensure that the valve position is less than 30 degrees open, and/or that the blower has stopped. Failure to

observe these precautions can result in permanent damage to the valve actuator.

Procedure for Entering Manual Positioning Mode (Command A-0):

a) Select and enter Command A-0, Enter Manual Positioning Mode. If the numbered lights flash momentarily after entering

Command A-0:

• The ADJUST switch may be in the MINIMUM position, or

• The unit may be “locked” to prevent tampering.

b) After entering the command, the yellow manual (MAN) light will be on. The INC/DEC switch can be used to move the valve

open or closed. If the ADJUST switch is in the INDEX position, the INC/DEC switch is used to move between the 19 position

“indexes”. If the ADJUST switch is in the ADJ position, pushing the INC/DEC switch up or down changes the valve position

in 1.0-degree steps. If the INC/DEC switch is held in the up or down position, the position is continuously adjusted until the

maximum or minimum position is reached. When the max or min position setpoint is reached, all the numbered lights will

momentarily flash.

c) To return control back to the 4-20 mA firing rate command input or burner management startup control, move the MODE

switch to the RUN position (down).