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2 Maintenance (continued)
31
Copper-fin II/IIE Boiler and Water Heater Service Manual
PRESSURE
REGULATOR
ADJUSTMENT
(UNDER CAP
SCREW)
INLET
OUTLET
GAS
VALVE
CONTROL
KNOB
MANOMETER
MANIFOLD
PRESSURE
CHAMBER
PRESSURE
TEE
TO BARBED
FITTING
Figure 2-4_Measuring manifold gas pressure
TABLE 2B
Net Manifold Pressure
Regulator Pressure Less
Front Chamber Pressure
MODEL Nat. Gas LP
402 - 752 1.8'' w.c. 4.6" w.c.
992 - 2072 1.2'' w.c. 4.6" w.c.