Specifications

Control Valves - SMARTLINK
®
MRV
www.maxoncorp.com
combustion systems for industry
Maxon reserves the right to alter specifications and data without prior notice.
© 2014 Copyright Maxon Corporation. All rights reserved.
10-30.7-43
E-i -3/14
50120624-001/
Installation Instructions
Safety Requirements
1. The SMARTLINK
®
MRV system should be used for positioning of multiple valves/dampers to control the air/fuel ratio to industrial/
commercial burners. The product is intended to replace mechanically or pneumatically linked air/fuel ratio control equipment in
combustion applications that can benefit from increased positioning repeatability and tamper resistance. If the equipment is used in a
manner not specified, the protection provided by the equipment may be impaired.
2. This product performs fail-safe air and fuel valve positioning only and does NOT include any air proving, flow monitoring, flame
detection, or burner management functions. This product operates in response to burner management start-up commands (i.e. Purge,
Light-off, Modulate) and to the temperature controller's output (or Firing Rate command) after burner start-up.
3. The SMARTLINK
®
MRV system is only responsible for proper positioning of valves/dampers attached to its actuators. If burner air/fuel
ratio can be significantly affected by other control motors, fans, variable frequency drives, or large changes in process operating
conditions, it is the commissioning engineer's responsibility to apply external equipment to detect unsafe air/fuel ratio operating
conditions.
4. This product must be set-up and maintained by qualified combustion personnel. Before operating this product, read all installation,
commissioning, and operating instructions (pages 10-30.7-43 through 10-30.7-89). Review all product specifications on pages 10-
30.7-5 and 10-30.7-6 to ensure the product is suitable for the intended application. During the burner commissioning process, external
equipment (i.e. flow/pressure devices, O
2
analyzer, etc.) or a view of the burner flame is required to ensure proper valve position set-
up.
5. This product must be electrically interfaced to the burner management system's permissive circuit or the automatic burner control's
safety circuit. This important wiring requirement ensures that any failure within the SMARTLINK
®
MRV system can shut down the
combustion system or disable a start-up sequence by turning off the main gas supply to the burner (i.e. de-energizing fuel shut-off
valves). Specifically, MAXON Relay Output Interface contacts (CE1/CE1R, CE2/CE2R, CO1/CO1R) must be connected in series with
the permissive circuit. If the minimum system is purchased and the Relay Output Interface is not provided, it is the commissioning
engineer's responsibility to connect the MAXON Control Interface relay drive outputs (RO2 and RO5) to appropriate interface relays
for safe shut down.
6. A current loop output signal (OUT+/OUT- of the Control Interface) is provided for optional monitoring of the start-up state, firing rate,
and valve position (during commissioning). This signal is not designed as a fail-safe output and should not be used by external
equipment to shut down the combustion system without the use of the SMARTLINK
®
MRV discrete permissive outputs (as discussed
in the previous safety requirement).
7. After mechanical replacement and re-calibration of a valve actuator, the previously commissioned valve positions must be re-verified.
8. The SMARTLINK
®
MRV Relay Output Interface (ROI), Purge Position Proven (PPP) and Light-off Position Proven (LPP) signals
should be connected to the burner management (or automatic burner control) if a purge and light-off command sequence is required.
These output signals are used to confirm the purge and light-off positions. If the optional Relay Output Interface is not purchased,
Control Interface relay drive signals RO3 and RO4 must be properly connected to customer-supplied interface relays.
9. If the power supply is not MAXON-supplied, a SELV (Safety Extra Low Voltage) rated supply with 24VDC output must be provided.
10. If the components of a SMARTLINK
®
MRV system are ordered separately (i.e. without a factory-wired Interface Panel assembly), the
commissioning engineer must incorporate a switch or circuit breaker that is in close proximity to the SMARTLINK
®
system. The switch
or breaker must be marked as the disconnection device for the equipment.
11. To avoid unsafe operating conditions or injury to fingers in the valve adapter assembly, turn off power to the system before actuator
replacement or valve body (or damper) servicing is performed. Read and follow all instructions for actuator removal and re-installation
as described on Page 10-30.7-68. After actuator replacement or valve body servicing, the commissioning engineer must verify burner
performance through the entire operating range and re-adjust valve positions (for the replaced actuator) as required. Refer to the
Commissioning Procedures on Pages 10-30.7-61 through -62. After any actuator replacement or valve body servicing, the
commissioning engineer must also confirm that the valve actuator number "selected" for re-adjustment (using the Control Interface or
User Display) is attached to a known valve body or damper. If a User Display is purchased, the fluid type associated with each valve
actuator should be defined as described in step a of the Commissioning Procedure on Page 10-30.7-63 and this will avoid any
confusion on which actuator controls which valve. Actuators purchased as part of a 2, 3 or 4 valve actuator system are numbered
electronically during manufacturing as #0, #1, #2 and #3. A spare actuator is always identified as #4 and is changed to a #0, 1, 2 or 3
during the replacement procedure. A green diagnostic LED in the actuator's wiring compartment and labeled "DIAG" indicates the
valve number by blinking 0 (always ON), 1, 2, 3 or 4 times per second. On the actuator label, the last digit of the model number also
indicates the valve actuator's number (with the exception of the spare actuator).