Crown Boiler MWC116ENL - Manual (Page 57)

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Manifold Pressure Tap
Inlet Pressure Tap
Modulation Leads
Figure 12.6: Gas Pressure Taps
Low Fire Adjustment
(Inner Hex Shaft)
High Fire Adjustment
(Outer Brass Nut)
Figure 12.7: Gas Pressure Adjustments (Pry Off Transparent Cover to Access)
Figure 12.5: Inner Cover Removal