AFR200 Series, Product User Guide
This document is subject to change without notice.
Caution: None of GAC products are flight certified controls including this item
Copyright © 2010, Governors America Corp., All Rights Reserved
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PUG4144 D
5. Connect a hose (or equivalent) to the feedback port that is long enough to reach the air cleaner or air
filtration system connection point. This information is covered in greater detail in the section labeled ‘Air
Filtration.’
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The reference pressure is taken between the air filtration system and the venturi inlet.
6. Once all the plumbing is complete, enable the fuel supply, and ensure the inlet pressure to the regulator
is positive but within the guidelines shown in the application considerations.
7. Remove the slotted cap on the regulator adjustment post to reveal the pressure adjustment screw.
8. Ensure the outlet pressure is slightly positive at full output.
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This needs to be adjusted once the fuel has been turned on and is the most common reason why an
engine will not start or will not run correctly on initial key up. After the SmartVU configuration
procedure is complete, the fuel system needs to be enabled.
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If the engine is being under-fueled at startup, then increase fuel regulator flow. If the engine is over-
fueled at startup, then decrease flow. In most cases it is best to decrease the flow of the regulator to
its minimum and increase the flow while cranking until the engine starts.
6.5 Electronic Gas Lockout Valve
This electronic gas lockout valve gives the fuel control system electronic authority of gas flow into the regulator
increasing over-all safety and performance. Generally when the control system is disabled the gas lockout valve
prohibits gas flow.
Typical Electronic Gas Lockout Valve
6.5.1 Application Considerations
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GAC recommends the installation of an electronic gas lockout (shutoff) valve for added safety.
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The installation must comply with all local and government regulations and safety codes.
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Refer to the manufacturer’s recommendations for the shutoff valve selected.
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If the desire is for the AFR controller and electronic gas lockout valve to wake / shutdown at the same
time, wiring information can be found in later sections.
6.6 Air Filtration
The air filtration is used to avoid accidental or unintentional pollutants and debris into the air intake system. The
available configurations for plumbing the air filtration range from a simple hose connection at the inlet of the fuel
valve assembly or a direct connection of the air filter unit to the mixer assembly.
