CleaverBrooks FLX Operation, Service And Parts Manual page 20

Chapter 2 Profire V Burner
Figure 2-11: Typical UL Gas Train, Full Modulation System, Size 1 V13 to V34
Figure 2-12: Typical UL Gas Train, Low-High-Off/Low-High-Low, Size 2 V35 to V63, Full Mod System, Size 2-3-4 V35 to V168
2-8 750-177