Yellow flame is caused by low o2. so open air shutter or lower gas input. that said if flame is equal across burner.a normal gas pressure to the burner is 3.5 " w.c. there should be a test port on outlet side of valve. the name plate will tell you what the pressure should be.
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Yellow flame is caused by low o2. so open air shutter or lower gas input. that said if flame is equal across burner.a normal gas pressure to the burner is 3.5 " w.c. there should be a test port on outlet side of valve. the name plate will tell you what the pressure should be.