Flue Gas Recirculation
8-4
750-204
Profire D/LND
FIGURE 8-1. General Layout of the Burner
8.3 — FGR Shutoff Valve
The FGR shutoff valve is located as close to the stack as possible. A
modutrol motor with a 90º stroke opens and closes the FGR shutoff
valve in 15 seconds. Proof of closure for the shutoff valve is provided
by and auxiliary switch in the modutrol motor. The modutrol motor
has a maximum temperature rating of 150º F. This valve should
never be mounted with the motor shaft in a vertical position. Dam-
age to the modutrol motor will result. During pre-purge and post-
purge, the FGR shutoff valve is closed to prevent any unused gas
fumes from returning to the combustion zone.
FIGURE 8-2. FGR Shutoff Valve
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